nix-packages/hydra/default.nix

{
  pkgs,
  inputs,
}: rec {
  hydra-patch = pkgs.stdenvNoCC.mkDerivation {
    name = "hydra.patch";
    srcs = inputs.hydra-patched;
    nativeBuildInputs = [pkgs.diffutils];
    buildPhase = ''
      diff -r -u ${inputs.hydra-base} . > $out || true
    '';
    installPhase = "true";
  };
  hydra = inputs.hydra.packages.${pkgs.system}.hydra.overrideAttrs (old: {
    patches = [
      hydra-patch
    ];
    doCheck = false;
  });
}