anchor.diff:                "mount LABEL=nixos /mnt",
             );
           '';
  -      fileSystems =
  -        ''
  -          { mountPoint = "/";
  -            device = " /dev/MyVolGroup/nixos";
  -          }
  -        '';
  +      fileSystems = rootFS;
       };
     
   }
  
positive.code:               "parted /dev/vda -- mkpart primary 1M 2048M", # first PV
                "udevadm settle",
                "parted /dev/vda -- set 1 lvm on",
                "parted /dev/vda -- mkpart primary 2048M -1s", # second PV
                "udevadm settle",
                "parted /dev/vda -- set 2 lvm on",
  
negative.code:         ''
            $machine->mustSucceed(
                "parted /dev/vda mklabel msdos",
                "udevadm settle",
                "parted /dev/vda -- mkpart primary linux-swap 1M 1024M",
                "udevadm settle",
                "parted /dev/vda -- mkpart primary ext2 1024M -1s",
                "udevadm settle",
                "mkswap /dev/vda1 -L swap",
                "swapon -L swap",
  