anchor.diff:  
   buildGoModule rec {
     pname = "skopeo";
  -  version = "1.2.0";
  +  version = "1.2.1";
   
     src = fetchFromGitHub {
       rev = "v${version}";
       owner = "containers";
       repo = "skopeo";
  -    sha256 = "1v7k3ki10i6082r7zswblyirx6zck674y6bw3plssw4p1l2611rd";
  +    sha256 = "1y9pmijazbgxzriymrm7zrifmkd1x1wad9b3zjcj7zwr6c999dhg";
     };
   
     outputs = [ "out" "man" ];
  
positive.code:     install -Dm755 bin/skopeo -t $out/bin
      installManPage docs/*.[1-9]
      installShellCompletion --bash completions/bash/skopeo
    '' + stdenv.lib.optionalString stdenv.isLinux ''
      wrapProgram $out/bin/skopeo \
        --prefix PATH : ${stdenv.lib.makeBinPath [ fuse-overlayfs ]}
    '';
  
    meta = with lib; {
  
negative.code: { lib
  , stdenv
  , buildGoModule
  , fetchFromGitHub
  , gpgme
  