anchor.diff:          name = "boot-netboot-" + name;
           nodes = { };
           testScript = ''
  -            nodes.machine = create_machine(${machineConfig})
  +            machine = create_machine(${machineConfig})
               machine.start()
               machine.wait_for_unit("multi-user.target")
               machine.shutdown()
  
positive.code:         if os.system("qemu-img create -f qcow2 -F raw -b ${sdImage} ${mutableImage}") != 0:
              raise RuntimeError("Could not create mutable linked image")
  
          nodes.machine = create_machine(${machineConfig})
          machine.start()
          machine.wait_for_unit("multi-user.target")
          machine.succeed("nix store verify -r --no-trust --option experimental-features nix-command /run/current-system")
  
negative.code:         nodes = { };
          testScript =
            ''
              machine = create_machine(${machineConfig})
              machine.start()
              machine.wait_for_unit("multi-user.target")
              machine.succeed("nix store verify --no-trust -r --option experimental-features nix-command /run/current-system")
  