these 5 derivations will be built:
  /nix/store/bvncspv554zf9jav9xk03hskwk1c6zzk-isolinux.cfg.drv
  /nix/store/hkypy1a9g1y1w74ah4afl1g9ih2wvwmj-closure-info.drv
  /nix/store/km7k4m7zkva74ly5wnw5zr4s6s8863xp-efi-directory.drv
  /nix/store/n77s9jihc9za135m098qqc1123b31sgi-efi-image_eltorito.drv
  /nix/store/jhc1ra92csv0rgid6ylgmrclr0ragavh-spaces-os.iso.drv