0.5 lixcon-2026 2026-04-17 2026-04-19 3 00:05 https://pretalx.dgnum.eu Europe/Paris Amphitheater Dussane Talk 2026-04-17T10:00:00+02:00 10:00 00:15 Welcome to LixCon! lixcon-2026-9-introduction-to-lixcon Ryan Lahfa ("RaitoBezarius") en false https://pretalx.dgnum.eu/lixcon-2026/talk/38JNUB/ https://pretalx.dgnum.eu/lixcon-2026/talk/38JNUB/feedback/ Amphitheater Dussane Short talk 2026-04-17T10:15:00+02:00 10:15 00:15 Botanix is a new CI software that targets a native nix integration as it builds derivations as its pipeline. It integrates natively with both Gerrit and Forgejo currently but its genericity allows for even more diversity in the future! This talk will present the genesis of the Botanix project, worked on by students from ENS de Lyon, its philosophy and inner workings. lixcon-2026-8-botanix-a-nix-native-ci-in-a-forge-agnostic-world Tom Hubrecht en false https://pretalx.dgnum.eu/lixcon-2026/talk/YZZKYT/ https://pretalx.dgnum.eu/lixcon-2026/talk/YZZKYT/feedback/ Amphitheater Dussane Talk 2026-04-17T10:45:00+02:00 10:45 00:30 Lix plugins — a feature so esoteric none yet remember their existence. What power could they hold? What secrets could they unlock? Let's discover together! lixcon-2026-13-the-untapped-potential-of-lix-plugins Qyriad en false https://pretalx.dgnum.eu/lixcon-2026/talk/PEDV9S/ https://pretalx.dgnum.eu/lixcon-2026/talk/PEDV9S/feedback/ Amphitheater Dussane Talk 2026-04-17T11:15:00+02:00 11:15 00:30 This talk is about Elpe, a mixture of ideas from Nix, Docker and Ubuntu/Debian/RHEL, with a strong focus on performance and security. I'll talk about the design choices I've made, and demo the thing and about how choices that may seem purely technical can have extreme political consequences. I'll also explain how such choices can have deep and lasting consequences on the dynamics of growing organisations. lixcon-2026-3-the-politics-of-language-design Pierre-Étienne Meunier en false https://pretalx.dgnum.eu/lixcon-2026/talk/HVZTB9/ https://pretalx.dgnum.eu/lixcon-2026/talk/HVZTB9/feedback/ Amphitheater Dussane Talk 2026-04-17T11:45:00+02:00 11:45 00:30 The Nix expression language is challenging to evaluate due to non-strict semantics, dynamic scoping, a diverse collection of builtin operators, and tight integration with the Nix store. We give a progress report on Regiux, an interpreter for Nix which is narrowly focused on efficient evaluation of expressions. lixcon-2026-4-regiux-prototyping-a-fast-nix-interpreter Corbin en Regiux is yet another attempt at a fast Nix evaluator. Come learn about the ingredients that go into modern compilers and interpreters, particularly: * Lexing and parsing * Desugaring and expanding * Intermediate languages for lambda calculus * Using the RPython JIT toolkit * Bytecode for lazy graph evaluation false https://pretalx.dgnum.eu/lixcon-2026/talk/F83VYV/ https://pretalx.dgnum.eu/lixcon-2026/talk/F83VYV/feedback/ Amphitheater Dussane Talk 2026-04-17T13:45:00+02:00 13:45 00:30 the ice caps are melting, ~~meteors are getting crashed into us~~ global warming stops for nothing and no one. the meltwater has to go somewhere. hope you brought a good boat. lixcon-2026-12-meltwater-rapids eldritch horrorsRaito en a brief look into the more recent history of lix dealing with tech debt, and where we want to go from here true https://pretalx.dgnum.eu/lixcon-2026/talk/A7BNGC/ https://pretalx.dgnum.eu/lixcon-2026/talk/A7BNGC/feedback/ Amphitheater Dussane Short talk 2026-04-17T14:15:00+02:00 14:15 00:15 Taking a look at the `functional` test suite, pointing out its concepts and flaws to then take a look at its successor `functional2` lixcon-2026-1-to-sleep-in-a-sea-of-tests-refactoring-a-testing-framework-from-hell rootile en Many curses and screams of frustration has the functional test suite brought forth in many - if not all - lix developers. Hence people wanted a successor. In this session, we will talk about all the pain, impurities and falkeyness of the functional suite, look at the features and non-features of functional2, and the pain of migrating tests. false https://pretalx.dgnum.eu/lixcon-2026/talk/KBFUXL/ https://pretalx.dgnum.eu/lixcon-2026/talk/KBFUXL/feedback/ Amphitheater Dussane Talk 2026-04-17T14:50:00+02:00 14:50 00:30 Nix does dependencies and distribution well, but has a controlling personality: it wants to build everything in the build graph. Buck2 delivers fast, user-friendly, and scalable project builds, but has an equally controlling personality and a lacking public dependency ecosystem. What if their build graphs touched ... and they were both girls? In this talk, I will demonstrate how we go from Nix to buck2 to Nix then deploy with containers: * Using Nix for dependencies in buck2 * Using buck2 in the project build: remote caching, fast builds, ~zero evaluation time * Importing store paths to Lix from buck2 output while correctly handling dependencies * Extending these techniques to build Docker images defined entirely in buck2, using nixpkgs `dockerTools` This talk focuses on buck2, but the techniques used apply to any powerful non-Nix build system. Slides: <https://jade.fyi/lixcon2026> lixcon-2026-2-nix-and-buck2-from-enemies-to-lovers-with-snowydeer Jade Lovelace en Hermetic build systems are hard to interoperate with, but there are cheat codes: by resolving their trust issues, you can combine their respective benefits. For the last year, my team and I have been working on a Buck2 migration for one of the largest Haskell codebases in industry to reduce build times from dozens of minutes to seconds and improve user experience. We use Nix to orchestrate hundreds of Haskell dependencies and hundreds more dependencies across the Rust, TypeScript, Python and C ecosystems. On top of that, we are running a much newer Haskell compiler than most of the industry due to active involvement in GHC development, which means a *heavily* patched nixpkgs Haskell dependency set to be able to incorporate these improvements. By building a Nix-Buck2-Nix sandwich, we were able to focus on rewriting our product build in buck2 while keeping both our Nix-based dependencies and our deployment pipelines to both NixOS and AWS ECS completely as-is. The novel contributions of this talk are: * Creating full-featured store paths *entirely* outside of Nix with Snowydeer: * Reference scanning outside of Nix using ripgrep * Using a new Lix CLI feature: output-addressed paths with references * Referencing those store paths from Nix language for further processing * Using Nix as a build step rather than a build driver to create an ergonomic Docker image builder with Snowydeer Container This talk builds on previous work, such as: - ["Integrating Nix and Buck2 for fun and profit"](https://www.youtube.com/watch?v=pDkFk7iggIE) by Claudio Bley - ["Haskell Builds at Scale: Comparing Bazel and Buck2"](https://www.youtube.com/watch?v=eA-3Gfr4epU) by Andreas Herrmann - ["Towards Dream Haskell Build Experience"](https://www.youtube.com/watch?v=WrdXUYFnRv4) by Ian-Woo Kim false https://pretalx.dgnum.eu/lixcon-2026/talk/Z3CRCM/ https://pretalx.dgnum.eu/lixcon-2026/talk/Z3CRCM/feedback/ Amphitheater Dussane Talk 2026-04-17T15:20:00+02:00 15:20 00:30 It's been a while since I last talked about Zilch; and now with Lix's existence, it's time to take another look; what's the status of this mysterious project, and what lessons can we learn from it? lixcon-2026-14-using-nix-without-the-nix-a-retrospective-on-zilch Puck en false https://pretalx.dgnum.eu/lixcon-2026/talk/QFSZRU/ https://pretalx.dgnum.eu/lixcon-2026/talk/QFSZRU/feedback/ Amphitheater Dussane Short talk 2026-04-17T15:50:00+02:00 15:50 00:15 Outro of LixCon, onwards on the hacking session lixcon-2026-15-lixcon-outro Ryan Lahfa ("RaitoBezarius") en false https://pretalx.dgnum.eu/lixcon-2026/talk/EYHR9T/ https://pretalx.dgnum.eu/lixcon-2026/talk/EYHR9T/feedback/ Salle des Actes Discussion format 2026-04-17T14:30:00+02:00 14:30 00:30 Let's talk about the current state of the Nix language and evaluator, and where things are headed. Nix lang2 (https://wiki.lix.systems/books/development/page/nix-lang-v2), language versioning (https://github.com/NixOS/rfcs/pull/137), bytecode, Rust and more. This will be more like a semi-structured infodump with some Q&A than a proper talk. Slides are unlikely to be prepared for this. No public recordings, but the plan is to take the transcript and compile it down into a blog post or something. lixcon-2026-11-updates-from-lix-nix-lang-land piegames en true https://pretalx.dgnum.eu/lixcon-2026/talk/EW3JLJ/ https://pretalx.dgnum.eu/lixcon-2026/talk/EW3JLJ/feedback/ Amphitheater Dussane Afnix GA 2026-04-18T14:00:00+02:00 14:00 01:00 General Assembly of the Association Française Nix lixcon-2026-22-afnix-ga en General Assembly of the Association Française Nix (AFNix - https://afnix.fr), non-profit organization providing legal and technical infrastructure for Nix community projects. We help make Lix possible! This General Assembly meeting is open to the public to listen in, however please be advised that active participation will be limited to organization members only. AFNix members will be available throughout the entire LixCon event for open discussion. false https://pretalx.dgnum.eu/lixcon-2026/talk/7CR3VM/ https://pretalx.dgnum.eu/lixcon-2026/talk/7CR3VM/feedback/