anchor.diff:        mknod ${dev}/null c 1 3
         mknod ${dev}/zero c 1 5
         mknod ${dev}/tty  c 5 0
  -      mknod ${dev}/vda  b 253 0
  +      . /sys/class/block/vda/uevent
  +      mknod ${dev}/vda  b $MAJOR $MINOR
       '';
   
     
  
positive.code: 
    modulesClosure = makeModulesClosure {
      inherit kernel;
      rootModules = ["cifs" "virtio_net" "virtio_pci" "virtio_blk" "virtio_balloon" "nls_utf8"];
    };
  
  
  
negative.code: 
      mkdir -p /fs/proc
      mount -t proc none /fs/proc
  
      mkdir -p /fs/sys
      mount -t sysfs none /fs/sys
  
      mkdir -p /fs/etc
      ln -sf /proc/mounts /fs/etc/mtab
  