#!/bin/sh
#
# Usage: modsave [flash|all]

save() {
	TMPFILE=/tmp/.save.tmp

	let MOD_LIMIT=32*1024

	# not really a lock
	if [ -e "$TMPFILE" ]; then
		echo "$TMPFILE exists! Concurrent update?" 1>&2
		exit 1
	fi

	tar -cf $TMPFILE flash -C /tmp/

	# compressed config size must be less than 32 KB (~32330Bytes)
	size=$(gzip -c $TMPFILE | wc -c)
	if [ "$size" -gt "$MOD_LIMIT" ]; then
		rm -f $TMPFILE
		echo "size: $size limit: $MOD_LIMIT" 1>&2
		echo "ERROR: /var/flash/freetz too big" 1>&2
		exit 1
	fi

	FLASHSUM="$(md5sum /var/flash/freetz 2>/dev/null)"
	echo -n "Writing $size bytes to /var/flash/freetz ... "
	cat $TMPFILE > /var/flash/freetz 2>/dev/null
	local rv=$?
	rm -f $TMPFILE
	# check if anything was written (only if md5sum is available)
	which md5sum >/dev/null && [ "$(md5sum /var/flash/freetz)" == "$FLASHSUM" ] && local rv=9
	if [ $rv -ne 0 ]; then
		echo 'failed.'
		exit $rv
	fi
	echo "done."
}

case $1 in
	""|all)
		echo -n 'Saving users, groups and passwords ... '
		/usr/bin/modusers save
		echo 'done.'

		echo -n 'Saving config ... '
		/usr/bin/modconf save mod
		if [ -e /etc/static.pkg ]; then
			for pkg in "$(cat /etc/static.pkg)"; do
				if [ -r "/etc/default.$pkg/$pkg.cfg" ]; then
					/usr/bin/modconf save "$pkg"
				fi
			done
		fi
		echo 'done.'

		save
		;;
	flash)
		save
		;;
	*)
		echo "Usage: $0 [flash|all]" 1>&2
		exit 1
		;;
esac

exit 0