anchor.diff:          chmod -R a-w image
   
           echo "Cooking the image..."
  -        tar -C image --hard-dereference --mtime="@$SOURCE_DATE_EPOCH" --owner=0 --group=0 --xform s:'./':: -c . | pigz -nT > $out
  +        tar -C image --hard-dereference --sort=name --mtime="@$SOURCE_DATE_EPOCH" --owner=0 --group=0 --xform s:'./':: -c . | pigz -nT > $out
   
           echo "Finished."
         '';
  
positive.code:       # Tar up the layer and throw it into 'layer.tar'.
        echo "Packing layer..."
        mkdir $out
        tar -C layer --hard-dereference --mtime="@$SOURCE_DATE_EPOCH" --owner=${toString uid} --group=${toString gid} -cf $out/layer.tar .
  
        # Compute a checksum of the tarball.
        echo "Computing layer checksum..."
  
negative.code: 
        postMount = ''
          echo "Packing raw image..."
          tar -C mnt --hard-dereference --sort=name --mtime="@$SOURCE_DATE_EPOCH" -cf $out .
        '';
      };
  
  