move_config() {
	. /lib/upgrade/common.sh
	. /lib/upgrade/platform.sh

	if export_bootdevice && export_partdevice partdev 4; then
		mount -t ext4 -o rw,noatime "/dev/$partdev" /mnt
		if [ -f "/mnt/$BACKUP_FILE" ]; then
			mv -f "/mnt/$BACKUP_FILE" /
		fi
		umount /mnt
	fi
}

boot_hook_add preinit_mount_root move_config