如何覆盖Nix中的包源？

Question

所以我想用一个新的fork替换我的home-manager配置中的pkgs.picom。我该怎么做呢？

我有种感觉是这样的：

let newPicom = pkgs.picom.override.src.url = "https://github.com/ibhagwan/picom";  
in 
services.picom.package = newPicom; 

但了解Nix可能实际上是对self: super:的一些非常长的咒语，等等。

Answer 1

覆盖包的源代码的nixos.wiki has an example。

您确实需要提供一个可重现的源。github存储库url是可变的，因此您需要指定修订版。

{ pkgs, ... }:
let newPicom = pkgs.picom.overrideAttrs (old: {
      version = "git"; # usually harmless to omit
      src = /* put your source here; typically a local path or
               a fixed-output derivation produced by
               `fetchFromGitHub`.
               builtins.fetchGit is also an option. Doesn't run
               in parallel but does fetch private sources. */;
    });
in {
  services.picom.package = newPicom; 
}