In reply to @elvishjerricco:matrix.org

Marcel: yea if you want to do closureinfo stuff to get full closures into systemd initrd I was thinking of something like this:

{
  boot.initrd.systemd.storePaths = [
    (runCommand "x"
      {
        info = closureInfo { rootPaths = [ hello ]; };
      }
      ''
        mkdir $out
        cat "$info"/store-paths | while read path; do
          ln -s "$path" "$out/$(basename "$path")"
        done
      ''
    )
  ];
}