anchor.diff:    tarballUrls = base: patch: map (n: "${n}/util-linux-${version base patch}.tar") (baseUrls base);
   
     base = "2.29";
  -  patch = "1";
  +  patch = "2";
   in
   stdenv.mkDerivation rec {
     name = "${type}util-linux-${version base patch}";
  
positive.code:   passthru = {
      srcVerification = fetchurl {
        failEarly = true;
        urls = map (n: "${n}.xz") (tarballUrls "2.29" "1");
        pgpsigUrls = map (n: "${n}.sign") (tarballUrls "2.29" "1");
        pgpsigSha256Urls = map (n: "${n}/sha256sums.asc") (baseUrls "2.29");
        pgpKeyFingerprint = "B0C6 4D14 301C C6EF AEDF  60E4 E4B7 1D5E EC39 C284";
        pgpDecompress = true;
        outputHash = "0ce40600b934ec2fecfa6bfc4efe6982d051ba96c2832b05201347aec582f54f";
        inherit (src) outputHashAlgo;
      };
    };
  
negative.code:   src = fetchurl {
      urls = map (n: "${n}.xz") (tarballUrls base patch);
      hashOutput = false;
      sha256 = "accea4d678209f97f634f40a93b7e9fcad5915d1f4749f6c47bee6bf110fe8e3";
    };
  
    nativeBuildInputs = [
  