these 6 derivations will be built:
  /nix/store/5qm1hpri4103knyaqyh0yjkz4b6bw4nr-efi-directory.drv
  /nix/store/9q1a1c6m8i5161k0jw40jhi7wxwscmih-closure-info.drv
  /nix/store/cgxvirj1m05d87279qsnrpr4wap1p21c-efi-image_eltorito.drv
  /nix/store/fhdqybhkzr4s63i8gslpjv3j8pvkj9iw-version.drv
  /nix/store/p6gzrjnqwpblz0zv1s1xafmhya0fqp9x-isolinux.cfg.drv
  /nix/store/4wwgy8937i9nj9jgjlmfm3328pdj1bjz-spaces-os.iso.drv