these 5 derivations will be built:
  /nix/store/rjnjrqr9s3rhw9adr9chvbj1n6i2zq4c-efi-directory.drv
  /nix/store/8lxw48r7nr7r67sv529qgc0cszpi7c2v-efi-image_eltorito.drv
  /nix/store/azxd93b7f2s9mg7xaz521s25w7n41ip9-isolinux.cfg.drv
  /nix/store/cabiv1xafdwrw6w3w61brx41nd3df1wi-closure-info.drv
  /nix/store/ryqq05s2yypb0ss0z9qmlkjcrwvv81lw-spaces-os.iso.drv