these 5 derivations will be built:
  /nix/store/7shafh4z1jb68v9aygf0sg1zjw7y0pqg-efi-directory.drv
  /nix/store/84whz3z6hhwxcsk54hg8ir90rr4zyk5b-efi-image_eltorito.drv
  /nix/store/ib2p1yv56ax62wh4lmk979m0gwmr0rhz-isolinux.cfg.drv
  /nix/store/sdix6mw8327f4q0y7yal2hn6szd813bc-closure-info.drv
  /nix/store/b5mf428dddylbb6hand0h9b4nb61pqr7-spaces-os.iso.drv