anchor.diff:  
       install-force-no-daemon = {
         script = ''
  -        set -eux
  -
           tar -xf ./nix.tar.xz
           mv ./nix-* nix
           ./nix/install --no-daemon
  
positive.code:       };
        rootDisk = "box.img";
        system = "x86_64-linux";
      };
  
    };
  
negative.code:       system = "x86_64-linux";
      };
  
      "fedora-36" = {
        image = import <nix/fetchurl.nix> {
          url = https://app.vagrantup.com/generic/boxes/fedora36/versions/4.1.12/providers/libvirt.box;
  