How to add custom python package?

earvstedt · July 19, 2018, 2:41pm

Unfortunately, it’s a bit complicated.
Here’s a full example that shows how to extend pythonPackages with a custom package for various python versions.

nix-build --no-out-link - <<'EOF'
let
  overlay = (self: super:
    let
      myOverride = {
        packageOverrides = self: super: {
          inotify_simple = super.buildPythonPackage rec {
            pname = "inotify_simple";
            version = "1.1.7";
            doCheck = false;
            src = super.fetchPypi {
              inherit pname version;
              sha256 = "1jvivp84cyp4x4rsw4g6bzbzqka7gaqhk4k4jqifyxnqqmbdgvcq";
            };
          };
        };
      };
    in {
      # Add an override for each required python version. 
      # There’s currently no way to add a package that’s automatically picked up by 
      # all python versions, besides editing python-packages.nix
      python2 = super.python2.override myOverride;
      python3 = super.python3.override myOverride;
      python35 = super.python35.override myOverride;
    }
  );

  pkgs = import <nixpkgs> { overlays = [ overlay ]; };
in
  with pkgs; [
    pythonPackages.inotify_simple
    python3Packages.inotify_simple
    python35Packages.inotify_simple
  ]
EOF