This August, I accomplished what I wanted for many years: I deleted the last cgo dependency in Debian Code Search! This was made possible by Go’s recently introduced SIMD support, because now we can implement the TurboPFor integer compression format as efficiently — more efficiently, in fact, by using the newer AVX512 instruction set! — as the reference implementation. Background: Why does DCS nee

For many years, I sometimes discovered that commands I was sure I had run were no longer present in my Z shell history file ( ~/.zsh_history ). In this article, I will show you how I tracked down the bug. Spoiler: ultimately, patching Zsh to make it crash loudly and analyzing the crash’s core dump was the winning strategy! The good news first Zsh 5.9.2 (released July 12th, 2026) contains a fix for

Back in January 2025, multiple different security researchers published a total of 6 security vulnerabilities in rsync , some of which allow arbitrary code execution and file leaks, so naturally I was wondering whether/how my gokrazy/rsync implementation was affected. Did implementing my own (compatible, but minimal) rsync in Go, a modern and memory-safe programming language, really rule out entir

Recently, during a production incident response, I guessed the root cause of an outage correctly within less than an hour (cool!) and submitted a fix just to rule it out, only to then spend many hours fumbling in the dark because we lacked visibility into version numbers and rollouts… 😞 This experience made me think about software versioning again, or more specifically about build info (build vers

I have come to appreciate coding agents to be valuable tools for working with computer program code in any capacity, such as learning about any program’s architecture, diagnosing bugs or developing proofs of concept. Depending on the use-case, reviewing each command the agent wants to run can get tedious and time-consuming very quickly. To safely run a coding agent without review, I wanted a Virtu

Wayland is the successor to the X server (X11, Xorg) to implement the graphics stack on Linux. The Wayland project was actually started in 2008, a year before I created the i3 tiling window manager for X11 in 2009 — but for the last 18 years (!), Wayland was never usable on my computers. I don’t want to be stuck on deprecated software, so I try to start using Wayland each year, and this articles o

For every cloud service I use, I want to have a local copy of my data for backup purposes and independence. Unfortunately, the gphotos-sync tool stopped working in March 2025 when Google restricted the OAuth scopes, so I needed an alternative for my existing Google Photos setup. In this post, I describe how I have set up Immich , a self-hostable photo manager. Here is the end result: a few (live)

I have been using a MacBook Pro M4 as my portable computer for the last half a year and wanted to share a few short impressions. As always, I am not a professional laptop reviewer, so in this article you won’t find benchmarks, just subjective thoughts! Back in 2021, I wrote about the MacBook Air M1 , which was the first computer I used that contained Apple’s own ARM-based CPU. Having a silent lapt

I liked the NixOS meetup earlier this year, and at the end of the meetup they told everyone about NixCon 2025, which would be happening in Switzerland this year, at the very same location, the University Of Applied Sciences OST in Rapperswil, so I decided to go! In this trip report, I want to give you a rough impression of how I experienced this awesome conference :) The bee in the title is a NixC

The Intel 285K CPU in my high-end 2025 Linux PC died again ! 😡 Notably, this was the replacement CPU for the original 285K that died in March , and after reading through the reviews of Intel CPUs on my electronics store of choice, many of which (!) mention CPU replacements, I am getting the impression that Intel’s current CPUs just are not stable 😞. Therefore, I am giving up on Intel for the comin

Passwords and secrets like cryptographic key files are everywhere in computing. When configuring a Linux system, sooner or later you will need to put a password somewhere — for example, when I migrated my existing Linux Network Storage (NAS) setup to NixOS , I needed to specify the desired Samba passwords in my NixOS config (or manage them manually, outside of NixOS). For personal computers, this

I wanted to use GoCV for one of my projects (to find and extract paper documents from within a larger scan), without permanently having OpenCV on my system. This seemed like a good example use-case to demonstrate a couple of Nix commands I like to use, covering quick interactive one-off dev shells to fully declarative, hermetic, reproducible, shareable dev shells. Notably, you don’t need to use Ni

In this article, I want to show how to migrate an existing Linux server to NixOS — in my case the CoreOS/Flatcar Linux installation on my Network Attached Storage (NAS) PC. I will show in detail how the previous CoreOS setup looked like (lots of systemd units starting Docker containers), how I migrated it into an intermediate state (using Docker on NixOS) just to get things going, and finally how

For one of my network storage PC builds , I was looking for an alternative to Flatcar Container Linux and tried out NixOS again (after an almost 10 year break). There are many ways to install NixOS, and in this article I will outline how I like to install NixOS on physical hardware or virtual machines: over the network and fully declaratively. Introduction: Declarative? The term declarative means

Update (2025-09-07): The replacement CPU also died and I have given up on Intel. See Bye Intel, hi AMD! for more details on the AMD 9950X3D. Turns out my previous attempt at this build had a faulty CPU! With the CPU replaced, the machine now is stable and fast! 🚀 In this article, I’ll go into a lot more detail about the component selection, but in a nutshell, I picked an Intel 285K CPU for low idl