these 5 derivations will be built:
  /nix/store/7bpbg8bkyz8ngi2simmg5j4svcga1ka1-efi-directory.drv
  /nix/store/jpd4scn32v0909x0s0k6s6yqpdmqk659-closure-info.drv
  /nix/store/lk7sbakslb0vmwpl14rzca7g3y8x5pap-isolinux.cfg.drv
  /nix/store/xjax1mchnmyqq6a6hr40ih4r7qjv5bxk-efi-image_eltorito.drv
  /nix/store/kx6w279fwhhccwlhxwd3gy7pqprmx8na-spaces-os.iso.drv