these 5 derivations will be built:
  /nix/store/3iriyxl8mppvi8klpysfinhyaq86njjz-closure-info.drv
  /nix/store/gvnyrqw0wpq44zkyfldq53ikwl7qbj4i-efi-directory.drv
  /nix/store/7zvqchaxq03d8bzkynknbc25v11xjcsr-efi-image_eltorito.drv
  /nix/store/c404xh85hnr3pw9i4vq1mzrbmn8zd4wl-isolinux.cfg.drv
  /nix/store/26g7vvd5mxzfk9bcdprks6xbbd7jakzy-spaces-os.iso.drv