Jacek Γαλοwιcζ

Founder of Nixcademy and Applicative Systems Group: Consultant for SW Engineering Processes and SW Architecture, Author of the C++17 STL Cookbook, giving university lectures about SW quality. Nix and NixOS, Haskell, C++, Purescript

Homepage: https://galowicz.de
Twitter: https://twitter.com/jgalowicz
Linkedin: https://linkedin.com/in/jgalowicz
GitHub: https://github.com/tfc
Call Us: https://nixcademy.com

Last Notes

2026-10-30 18:37:29 UTC

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what happened?

2026-08-24 09:33:29 UTC

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Fragst Du jetzt nach meinen Eltern oder war das so gesagt? Ich habe nicht viel Geld. :-D
Es ist ganz normal dass ein winziger Prozentsatz an Gehalt/Gewinn aus Multimillionen Unternehmen rauskommt, weil der Markt den Gewinn halt schnell rausebnet. Wenn Du dann wirklich an das was die Leute privat angespart haben willst damit das Unternehmen nicht liquiditiert werden muss, dann haben die Leute am Ende nur wenige Prozent des zu versteuernden Erbwerts auf irgendwelchen Konten, wenn ueberhaupt. Aber Leute fordern immer dass 30%, 50%, 70% versteuert werden muessen.
Hattest Du jemals ein Unternehmen? Stellst Du Dir das so vor, dass Leute die ein z.B. 1mio Euro bewertetes Unternehmen haben, einfach so 500.000 auf irgendwelchen Konten liegen haben?

2026-08-24 09:26:03 UTC

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Wenn man Geld oder Gut erbt, kann man das ja teilweise verkaufen und dann Steuern zahlen. Aber wie soll das bei Unternehmen klappen? Der Wert liegt ja nicht als Bankkontostand oder liquidierbaren Guetern vor. Willst Du Material verkaufen und Angestellte feuern um das Geld fuer Steuern klar zu machen?

2026-08-18 15:06:57 UTC

Multi-platform outputs should be the most basic thing a flake does. Yet,, the common answer was to pull in flake-utils/flake-parts: an extra input, a limited "default systems" list from a third-party repo, and pinned copies piling up in nested lock files.
Meanwhile, builtins.mapAttrs over nixpkgs.legacyPackages covers every platform nixpkgs supports — with zero inputs. Since August 2026, `nix flake init` gives you exactly this.
How it works & how to extend it:
https://nixcademy.com/posts/new-default-nix-flake-template/
#Nix [@nixos_org](https://chaos.social/@nixos_org ) #Flakes

2026-08-10 08:20:33 UTC

Two years ago, the Mac was the awkward special case for Linux builds. Today, my MacBook outbuilds my Linux machines. 🤯
We just got merged a new Linux builder backend into nixpkgs that runs on Apple's Virtualization.framework and exposes Rosetta to the guest VM.
The results on Apple Silicon:
⚡ x86_64-linux builds are 2.5x faster than QEMU emulation
📦 Builder closure shrinks from 3.2 GiB to 1.2 GiB
🚀 VM boots 2x faster
🧪 Nested virtualization: NixOS integration tests with /dev/kvm now run on your Mac (M3+)
And the best part: it's a drop-in replacement. If you use nix-darwin, switching is literally two extra lines in your configuration.
Under the hood is vzvm, a purpose-built VM monitor in ~1000 lines of Swift with zero external dependencies. No bootloader, no disk image juggling, no network configuration. It does exactly what a Nix remote builder needs — and nothing else.
The fun part of the story: building x86_64 NixOS systems and deploying them remotely is now faster from my Mac than from my aarch64 Linux machines, because Rosetta beats QEMU's software emulation hands down.
Full write-up with setup instructions, benchmarks, and how it works under the hood:
https://nixcademy.com/posts/rosetta-linux-builder-macos/
#Nix #NixOS #macOS #AppleSilicon #DevOps #DeveloperExperience
[@nixos_org](https://chaos.social/@nixos_org )

2026-03-14 18:08:54 UTC

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so i guess we are at 100% 😁😁😁

2026-03-14 12:07:54 UTC

The [@nixos_org](https://chaos.social/@nixos_org ) integration tests have always been a fantastic tool - We just made them even faster and much simpler to run! 🚀 By adding a new lightweight container backend to the test driver, you can now run your suites on standard, non-KVM VMs. 👇
Here is what the new container backend brings to your NixOS workflow:
⚡ Blazing Fast Execution: How fast? Booting two machines, letting them ping each other, and tearing them down now takes ~3 seconds!
💸 Run Anywhere (Cheaper!): You no longer need bare-metal KVM-enabled hosts. Your tests can now run seamlessly on cheap, standard VMs.
🎮 GPU Testing Support: Hardware acceleration is now accessible. You can finally test GPU-dependent workloads directly inside your integration tests!
Curious how it works under the hood and how to enable it in your projects? Dive into our latest article and try it out for yourself!
🔗 Read the full breakdown here: https://nixcademy.com/posts/faster-cheaper-nixos-integration-tests-with-containers/
#NixOS #DevOps #Testing #Linux #Nix #InfrastructureAsCode #CI #Containers
https://files.functional.cafe/media_attachments/files/116/227/441/753/448/997/original/353c22f0436b5ea9.png

2024-12-18 17:50:37 UTC

'Tis the season for giving... and for learning Nix! 🎁 We hope your holidays are filled with joy and that Santa brings you everything on your Nix expression list. 🎅
🤝 From everyone at Nixcademy, have a wonderful holiday season!
https://functional.cafe/system/media_attachments/files/113/675/019/299/537/689/original/ad559e44401aa796.jpeg