anchor.diff:    src = fetchurl {
       url = "mirror://sourceforge/e2fsprogs/e2fsprogs/v${version}/${name}.tar.gz";
       hashOutput = false;
  -    sha256 = "c2ae6d8ce6fb96b55886cf761411fc22ab41976f4f8297fc54c706df442483be";
  +    sha256 = "dd707688f0fc353941931c20081f26ec8e54b0bc1ac3f7601f479f9c7675dcb2";
     };
   
     buildInputs = [
  
positive.code:   passthru = {
      srcVerification = fetchurl {
        failEarly = true;
        pgpsigUrls = map (n: "${n}.asc") src.urls;
        pgpKeyFingerprint = "3AB0 57B7 E78D 945C 8C55  91FB D36F 769B C118 04F0";
        inherit (src) urls outputHash outputHashAlgo;
      };
    };
  
  
negative.code: }:
  
  let
    version = "1.44.4";
  in
  stdenv.mkDerivation rec {
    name = "e2fsprogs-${version}";
  