these 5 derivations will be built:
  /nix/store/bsfz8vz6d9xa0qrh6kz9kgf8bll5ff7f-closure-info.drv
  /nix/store/w9fprfqyq0wmyj41n6vzbxrs5mvgajsx-efi-directory.drv
  /nix/store/jm29dgrgd25y9z0451wz4sckv8w9r6h2-efi-image_eltorito.drv
  /nix/store/n2lvfmc7g0aq9ihdd1acdrpgk9c08w5m-isolinux.cfg.drv
  /nix/store/mhd7cnqc0vfcs09md4xy6npivqsfkcaw-spaces-os.iso.drv