these 5 derivations will be built:
  /nix/store/9gxgdxsi5is1axpgkjyryabvryyhn2m6-isolinux.cfg.drv
  /nix/store/cg98hy1sycq5flsaynq2l5bdykbh9mhv-closure-info.drv
  /nix/store/g32d6r7npixwg7gwhdvwszjxxhndxcnl-efi-directory.drv
  /nix/store/dr92b7vjzgnpxqs6k2svvd9mlzxb8xlm-efi-image_eltorito.drv
  /nix/store/w9pnm039asx2nf3v1ml4l7ayjv59r9z2-spaces-os.iso.drv