hydra_nodarcs.nix

#via https://gist.githubusercontent.com/thefloweringash/cc73f3a545fe0cdcfb16fb05dd4ba570/raw/6b9789c1089643d1099ec1bf076dda0b45b76661/hydra.nix
 self: super: {
    hydra =
      let
        pkgs = import <nixpkgs> {};
        notDarcs = pkgs.writeShellScriptBin "darcs" ''
          echo "Stub darcs for unspported platform"
          exit 1
        '';
      in (super.hydra.override {
        darcs = notDarcs;
      }).overrideAttrs (attrs: {
        doCheck = false; # it tries to check darcs
      });
  }