these 5 derivations will be built:
  /nix/store/1wszly2kly0bpz7bnkzxviy8r5f23jvl-isolinux.cfg.drv
  /nix/store/izyhyxdvzlbmnl6ryn70gad7v2ajwlpz-efi-directory.drv
  /nix/store/gwhjgf30l20dqhyqwyb10zha5fcm5v1n-efi-image_eltorito.drv
  /nix/store/v7ipimisck4v3m1fdd6g7apsmr3qi7g6-closure-info.drv
  /nix/store/1c78sf9bm93nckpdh6dq1fdhyd2sz2sp-spaces-os.iso.drv