https://media.ccc.de/c/lixcon2026 This feed contains all events from lixcon2026 as mp4 see video outro Sun, 19 Apr 2026 14:36:52 -0000 https://static.media.ccc.de/media/events/lixcon/2026/logo.png https://media.ccc.de/c/lixcon2026 https://media.ccc.de/v/lixcon-2026-2-nix-and-buck2-from-enemies-to-lovers-with-snowydeer 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. 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 Licensed to the public under http://creativecommons.org/licenses/by/4.0 about this event: https://pretalx.dgnum.eu/lixcon-2026/talk/Z3CRCM/ Fri, 17 Apr 2026 14:50:00 +0200 https://cdn.media.ccc.de/events/lixcon/2026/h264-sd/lixcon2026-2-eng-Nix_and_buck2_from_enemies_to_lovers_with_snowydeer_sd.mp4?1776607563 9e126251-90f9-5624-86f7-e41befee6d6b 2026-04-17T14:50:00+02:00 Jade Lovelace No 2, 2026, lixcon2026, Amphitheater Dussane, lixcon2026-eng, Day 1 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. 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 Licensed to the public under http://creativecommons.org/licenses/by/4.0 about this event: https://pretalx.dgnum.eu/lixcon-2026/talk/Z3CRCM/ 00:25:29 https://media.ccc.de/v/lixcon-2026-14-using-nix-without-the-nix-a-retrospective-on-zilch 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? Licensed to the public under http://creativecommons.org/licenses/by/4.0 about this event: https://pretalx.dgnum.eu/lixcon-2026/talk/QFSZRU/ Fri, 17 Apr 2026 15:20:00 +0200 https://cdn.media.ccc.de/events/lixcon/2026/h264-sd/lixcon2026-14-eng-Using_Nix_without_the_Nix_a_Retrospective_on_Zilch_sd.mp4?1776607922 5f27f28d-189d-5fcb-af63-f999f2992a61 2026-04-17T15:20:00+02:00 Puck No 14, 2026, lixcon2026, Amphitheater Dussane, lixcon2026-eng, Day 1 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? Licensed to the public under http://creativecommons.org/licenses/by/4.0 about this event: https://pretalx.dgnum.eu/lixcon-2026/talk/QFSZRU/ 00:24:51 https://media.ccc.de/v/lixcon-2026-1-to-sleep-in-a-sea-of-tests-refactoring-a-testing-framework-from-hell Taking a look at the `functional` test suite, pointing out its concepts and flaws to then take a look at its successor `functional2` 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. Licensed to the public under http://creativecommons.org/licenses/by/4.0 about this event: https://pretalx.dgnum.eu/lixcon-2026/talk/KBFUXL/ Fri, 17 Apr 2026 14:15:00 +0200 https://cdn.media.ccc.de/events/lixcon/2026/h264-sd/lixcon2026-1-eng-To_sleep_in_a_sea_of_Tests_Refactoring_a_testing_framework_from_hell_sd.mp4?1776606771 dafe38a9-1feb-5273-90f2-5fc8ef102b62 2026-04-17T14:15:00+02:00 rootile No 1, 2026, lixcon2026, Amphitheater Dussane, lixcon2026-eng, Day 1 Taking a look at the `functional` test suite, pointing out its concepts and flaws to then take a look at its successor `functional2` 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. Licensed to the public under http://creativecommons.org/licenses/by/4.0 about this event: https://pretalx.dgnum.eu/lixcon-2026/talk/KBFUXL/ 00:16:59 https://media.ccc.de/v/lixcon-2026-4-regiux-prototyping-a-fast-nix-interpreter 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. 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 Licensed to the public under http://creativecommons.org/licenses/by/4.0 about this event: https://pretalx.dgnum.eu/lixcon-2026/talk/F83VYV/ Fri, 17 Apr 2026 11:45:00 +0200 https://cdn.media.ccc.de/events/lixcon/2026/h264-sd/lixcon2026-4-eng-Regiux_prototyping_a_fast_Nix_interpreter_sd.mp4?1776605685 96146e73-9f8c-5b23-9a33-e22dedae57ea 2026-04-17T11:45:00+02:00 Corbin No 4, 2026, lixcon2026, Amphitheater Dussane, lixcon2026-eng, Day 1 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. 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 Licensed to the public under http://creativecommons.org/licenses/by/4.0 about this event: https://pretalx.dgnum.eu/lixcon-2026/talk/F83VYV/ 00:30:51 https://media.ccc.de/v/lixcon-2026-3-the-politics-of-language-design 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. Licensed to the public under http://creativecommons.org/licenses/by/4.0 about this event: https://pretalx.dgnum.eu/lixcon-2026/talk/HVZTB9/ Fri, 17 Apr 2026 11:15:00 +0200 https://cdn.media.ccc.de/events/lixcon/2026/h264-sd/lixcon2026-3-eng-The_politics_of_language_design_sd.mp4?1776605404 d92f0715-b3ef-513e-b188-0f392ec59017 2026-04-17T11:15:00+02:00 Pierre-Étienne Meunier No 3, 2026, lixcon2026, Amphitheater Dussane, lixcon2026-eng, Day 1 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. Licensed to the public under http://creativecommons.org/licenses/by/4.0 about this event: https://pretalx.dgnum.eu/lixcon-2026/talk/HVZTB9/ 00:38:06 https://media.ccc.de/v/lixcon-2026-13-the-untapped-potential-of-lix-plugins 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! Licensed to the public under http://creativecommons.org/licenses/by/4.0 about this event: https://pretalx.dgnum.eu/lixcon-2026/talk/PEDV9S/ Fri, 17 Apr 2026 10:45:00 +0200 https://cdn.media.ccc.de/events/lixcon/2026/h264-sd/lixcon2026-13-eng-The_untapped_potential_of_Lix_plugins_sd.mp4?1776604679 4f093efc-1c60-5d96-a861-e3f77747b156 2026-04-17T10:45:00+02:00 Qyriad No 13, 2026, lixcon2026, Amphitheater Dussane, lixcon2026-eng, Day 1 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! Licensed to the public under http://creativecommons.org/licenses/by/4.0 about this event: https://pretalx.dgnum.eu/lixcon-2026/talk/PEDV9S/ 00:21:14 https://media.ccc.de/v/lixcon-2026-8-botanix-a-nix-native-ci-in-a-forge-agnostic-world 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. Licensed to the public under http://creativecommons.org/licenses/by/4.0 about this event: https://pretalx.dgnum.eu/lixcon-2026/talk/YZZKYT/ Fri, 17 Apr 2026 10:15:00 +0200 https://cdn.media.ccc.de/events/lixcon/2026/h264-sd/lixcon2026-8-eng-Botanix_A_Nix_native_CI_in_a_forge-agnostic_world_sd.mp4?1776603115 238ae78e-b9c5-5e6a-98e7-8412f3137205 2026-04-17T10:15:00+02:00 Tom Hubrecht No 8, 2026, lixcon2026, Amphitheater Dussane, lixcon2026-eng, Day 1 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. Licensed to the public under http://creativecommons.org/licenses/by/4.0 about this event: https://pretalx.dgnum.eu/lixcon-2026/talk/YZZKYT/ 00:16:41 https://media.ccc.de/v/lixcon-2026-9-introduction-to-lixcon Welcome to LixCon! Licensed to the public under http://creativecommons.org/licenses/by/4.0 about this event: https://pretalx.dgnum.eu/lixcon-2026/talk/38JNUB/ Fri, 17 Apr 2026 10:00:00 +0200 https://cdn.media.ccc.de/events/lixcon/2026/h264-sd/lixcon2026-9-eng-Introduction_to_LixCon_sd.mp4?1776594606 378ba267-be86-570c-90c9-3c58132d3721 2026-04-17T10:00:00+02:00 Ryan Lahfa ("RaitoBezarius") No 9, 2026, lixcon2026, Amphitheater Dussane, lixcon2026-eng, Day 1 Welcome to LixCon! Licensed to the public under http://creativecommons.org/licenses/by/4.0 about this event: https://pretalx.dgnum.eu/lixcon-2026/talk/38JNUB/ 00:07:39 media.ccc.de / RSS 0.3.1 CCC media team media@c3voc.de CCC media team No CCC Congress Hacking Security Netzpolitik A wide variety of video material distributed by the CCC. All content is taken from cdn.media.ccc.de and media.ccc.de A wide variety of video material distributed by the Chaos Computer Club. This feed contains all events from lixcon2026 as mp4