anchor.diff:        --mode=go=rX,u+rw,a-s \
         --clamp-mtime --mtime=@$mtime \
         -c "${name'}" | ${brotli}/bin/brotli --quality 6 --output "$out"
  -    du -bhs "$out"
  -    cp "$out" "$TMPDIR/${name}"
     '';
   } // removeAttrs args [ "name" "version" "purgeTimestamps" "downloadToTemp" "postFetch" "stripRoot" "extraPostFetch" ]))
   # Hackety-hack: we actually need unzip hooks, too
  
positive.code:     unpackFile "$TMPDIR/tarball.${tarball}"
  
      shopt -s dotglob
      mkdir "$TMPDIR/${name'}"
    '' + (if stripRoot then ''
      if [ $(ls "$unpackDir" | wc -l) != 1 ]; then
  
negative.code:     start="$(date -u '+%s')"
  
      unpackDir="$TMPDIR/unpack"
      rm -rf "$unpackDir"
      mkdir "$unpackDir"
      cd "$unpackDir"
  
  