The Nix Hour

Currently Playing: The Nix Hour #42 [finalAttrs, NixOS arguments, unfree licenses]

Questions can only be asked by voice or chat in the meeting: https://meet.jit.si/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/42 00:00 Intro, no Nix Hour next week 00:45 Q: finalAttrs pattern benefits, overrideAttrs and overlays 06:36 Overriding version and src with overrideAttrs 09:46 Recursive attribute sets 10:34 Using fixed point, lib.fix 11:52 How overlays work 13:09 Using finalAttrs in derivation 15:04 Using finalAttrs in overrideAttrs 17:46 passthru.tests: nixosTest using finalPackage 21:54 finalAttrs examples from nixpkgs 23:38 Q: NixOS configuration arguments 25:40 Nix module args: lib 26:26 Nix module args: config 29:04 Nix module args: options 32:30 Nix module args: specialArgs 38:20 Nix module args: ..., builtins.functionArgs 39:26 NixOS specific arguments 40:39 NixOS module args: modulesPath 42:23 NixOS module args: baseModules, extraModules 43:33 NixOS module args: extendModules 45:34 NixOS module args: pkgs and utils 46:17 NixOS module args: moduleType 46:55 Q: Asking users to accept unfree licenses 47:38 requireFile 51:07 nix-prefetch-url 52:02 inlining a script in error message 54:32 impureEnvVars 57:27 Q: Language servers for Nix 59:15 Outro