these 5 derivations will be built:
  /nix/store/kh25cw0h5gdrpzla9pzipsbbbyssz7pd-efi-directory.drv
  /nix/store/8l3qmfr2w3lv79bp7as9ab1iqha3k0v8-efi-image_eltorito.drv
  /nix/store/g0nwad53j2fq43innnrq2z4w26wfi2zm-closure-info.drv
  /nix/store/j9p56h8njrnap32d7dvxzngz2aa87m97-isolinux.cfg.drv
  /nix/store/3gghsd8r4sm38v10jyawjm6zjh4i3i99-spaces-os.iso.drv