The Nix Hour

Currently Playing: The Nix Hour #43 [adding trunk version of CPython to nixpkgs]

Questions can only be asked by voice or chat in the meeting: https://meet.zrh.init7.net/nix-hour. The Nix Hour is an open beginner-oriented Q&A-style lecture on Nix, where you can bring your questions and we’ll answer them with more context, examples, alternatives, tradeoffs and related topics. Matrix room for questions, feedback and notifications: https://matrix.to/#/%23nix-hour:matrix.org Issue tracker for asynchronous questions: https://github.com/tweag/nix-hour/issues Previous sessions playlist: https://www.youtube.com/playlist?list=PLyzwHTVJlRc8yjlx4VR4LU5A5O44og9in For more information and updates, check out https://discourse.nixos.org/t/the-nix-hour-a-weekly-nix-qa-lecture-by-tweag/22767 Files from this session: https://github.com/tweag/nix-hour/tree/master/43 00:00 Intro 00:47 Q: Compiling CPython from source 01:55 Python packages structure in nixpkgs 03:07 Adding Python version to pythonInterpreters 09:50 fetchurl vs fetchzip with GitHub 12:20 Back to building CPython, adding patches 17:13 Look for build times in Hydra 18:37 Limiting parallelism in build process 19:52 Adding CPython version in overlay 22:06 Simple flake with an overlay 25:52 Adjusting code from nixpkgs in overlay 26:47 Aside: callPackage and __splicedPackages 35:00 Back to passing arguments to CPython build 37:54 Overriding src definition 40:56 Adding patches 44:49 Fixing source hash 46:30 Pinning nixpkgs revision in flake 48:26 Overriding pythonInterpreters and .override 55:35 Making sure master CPython runs 56:24 Could we use overrideAttrs on last CPython version? 58:10 Outro