# Pastebin MFJl81KR
  commit = (removeSuffix "\n" (readFile (
    stdenv.mkDerivation rec {
      name = "commit";
      src = sourceByRegex ../. ["\.git.*"];
      passAsFile = ["buildCommand"];
      buildInputs = [git];
      buildCommand = ''
        cd $src
        git show-ref -s HEAD > $out
      '';
    })));