these 5 derivations will be built:
  /nix/store/232q15scr2zrzab2qkv2vq5p3cl2acym-efi-directory.drv
  /nix/store/ghsdig5shh3lh6krbszxyq5chdgg8kcw-isolinux.cfg.drv
  /nix/store/l2s6c3rm7k0zibssdjv3v1phr6ngzbw6-closure-info.drv
  /nix/store/zrsz8h0s970aqwc5wnpzpv7g3jmmqk9r-efi-image_eltorito.drv
  /nix/store/f2h3bqbb3cb8kg3hqrg29sl1l29zm0s2-spaces-os.iso.drv