anchor.diff:          chmod -R a-w image
   
           echo Cooking the image
  -        tar -C image -czf $out .
  +        tar -C image -c . | pigz > $out
         '';
   
       in
  
positive.code: { stdenv, lib, callPackage, runCommand, writeReferencesToFile, writeText, vmTools, writeScript
  , docker, shadow, utillinux, coreutils, jshon, e2fsprogs, goPackages }:
  
  # WARNING: this API is unstable and may be subject to backwards-incompatible changes in the future.
    
  
negative.code:                then mkPureLayer { inherit baseJson contents extraCommands; }
                 else mkRootLayer { inherit baseJson fromImage fromImageName fromImageTag contents runAsRoot diskSize extraCommands; });
        result = runCommand "${baseName}.tar.gz" {
          buildInputs = [ jshon pigz ];
  
          imageName = name;
          imageTag = tag;
  