case "$MODE" in
    commandline)
        add_option "squashfs-image" "`eval_gettext "create squashfs image for use with NBD."`" "advanced" "false"
        ;;
    configure)
        if [ -n "$option_squashfs_image_value" ]; then
            # set an environment variable we can pick up later
            SQUASHFS_IMAGE="True"
        fi
        if [ "True" = "$SQUASHFS_IMAGE" ]; then
            # need to use versioned linux-image metapackages, as kernel modules
            # do not appear to have corresponding unversioned ones
            KERNEL_VERSION="2.6"
        fi
        ;;
    before-install)
        if [ "True" = "$SQUASHFS_IMAGE" ]; then
            for fs in aufs squashfs ; do
                # add appropriate module packages to list of packages to be installed
                LATE_PACKAGES="$LATE_PACKAGES ${fs}-modules-${KERNEL_VERSION}-${KERNEL_ARCH}"
            done

            BOOTPROMPT_OPTS=${BOOTPROMPT_OPTS:-"quiet ip=dhcp boot=ltsp_nbd"}
            export BOOTPROMPT_OPTS
            mkdir -p $ROOT/etc/ltsp/
            echo "BOOTPROMPT_OPTS=\"$BOOTPROMPT_OPTS\"" >> $ROOT/etc/ltsp/update-kernels.conf
        fi
        ;;
    finalization)
        if [ "True" = "$SQUASHFS_IMAGE" ]; then
            DEBIAN_OLD_FRONTEND=$DEBIAN_FRONTEND

            if [ -n "$CHROOT" ]; then
                UPDATE_IMAGE_OPTIONS="-a ${CHROOT}"
            fi

            DEBIAN_FRONTEND=noninteractive
            export DEBIAN_FRONTEND

            umount $ROOT/proc || true

            /usr/sbin/ltsp-update-image ${UPDATE_IMAGE_OPTIONS}
            chroot $ROOT mount -t proc proc /proc || true

            DEBIAN_FRONTEND=$DEBIAN_OLD_FRONTEND
            export DEBIAN_FRONTEND
        fi
        ;;
esac
