anchor.diff:        mknod ${dev}/random  c 1 8
         mknod ${dev}/urandom c 1 9
         mknod ${dev}/tty     c 5 0
  +      mknod ${dev}/rtc     c 254 0
         . /sys/class/block/${hd}/uevent
         mknod ${dev}/${hd} b $MAJOR $MINOR
       '';
  
positive.code:   stage2Init = writeScript "vm-run-stage2" ''
      #! ${bash}/bin/sh
      source /tmp/xchg/saved-env
  
      export NIX_STORE=/nix/store
      export NIX_BUILD_TOP=/tmp
  
negative.code: , kernel ? pkgs.linux_3_10
  , img ? "bzImage"
  , rootModules ?
      [ "virtio_pci" "virtio_blk" "virtio_balloon" "ext4" "unix" "9p" "9pnet_virtio" "rtc_cmos" ]
  }:
  
  with pkgs;
  