anchor.diff:        }
       '';
   
  -  rootFS =
  -    ''
  -      fileSystems."/".device = "/dev/disk/by-label/nixos";
  -    '';
  -
  -  bootFS =
  -    ''
  -      fileSystems."/boot".device = "/dev/disk/by-label/boot";
  -    '';
  -
   
     # Configuration of a web server that simulates the Nixpkgs channel
     # distribution server.
  
positive.code:   # The test script boots the CD, installs NixOS on an empty hard
    # disk, and then reboot from the hard disk.  It's parameterized with
    # a test script fragment `createPartitions', which must create
    # partitions and filesystems, and a configuration.nix fragment
    # `fileSystems'.
    testScriptFun = { createPartitions, fileSystems, testChannel, grubVersion, grubDevice }:
      let iface = if grubVersion == 1 then "scsi" else "virtio"; in
      ''
        createDisk("harddisk", 4 * 1024);
  
negative.code:               "mount LABEL=boot /mnt/boot",
            );
          '';
      };
  
    # Create two physical LVM partitions combined into one volume group
  