openwrt/package/system/fstools/files/snapshot

#!/bin/sh
# Copyright (C) 2014 OpenWrt.org


do_snapshot_unpack() {
	echo "- snapshot -"
	mkdir /tmp/snapshot
	cd /tmp/snapshot
	fs-state snapshot read
	block=`ls block*.tar.gz 2> /dev/null`
	[ -z "$block" ] || for a in $block; do
		tar xzf $a -C /
		rm -f $a
	done
}

do_config_unpack() {
	echo "- config -"
	fs-state snapshot config_read
	[ -f /tmp/config.tar.gz ] && {
		tar xzf /tmp/config.tar.gz -C /
		rm -f /tmp/config.tar.gz
	}
}

do_snapshot_push() {
	cd /volatile
	tar czf /tmp/snapshot.tar.gz *
	fs-state snapshot write
	reboot
}

do_config_push() {
	cd /volatile
	tar czf /tmp/config.tar.gz *
	fs-state snapshot config_write
}

do_snapshot_upgrade() {
	opkg update
	[ $? == 0 ] || exit 1

	opkg list-upgradable
	[ $? == 0 ] || exit 2
	
	UPDATES=`opkg list-upgradable | cut -d" " -f1`
	[ -z "${UPDATES}" ] && exit 0

	opkg upgrade ${UPDATES}
	[ $? == 0 ] || exit 3

	do_snapshot_push
	sleep 5
	reboot
	sleep 10
}

do_convert_jffs2() {
	fs-state snapshot write
	sleep 2
	reboot -f
}

do_convert() {
	. /lib/functions.sh
	. /lib/upgrade/common.sh
	ubus call system upgrade
	touch /tmp/sysupgrade
	cd /overlay
	tar czf /tmp/snapshot.tar.gz *
	kill_remaining TERM
	sleep 3
	kill_remaining KILL
	run_ramfs '. /sbin/snapshot; do_convert_jffs2'
}

[ -n "$(cat /proc/mounts|grep /overlay|grep jffs2)" ] && {
case $1 in
convert)
	do_convert
	;;
esac
}

[ -d /volatile ] && {
case $1 in
push)
	do_snapshot_push
	;;
config)
	do_config_push
	;;
upgrade)
	do_snapshot_upgrade
	;;
info)
	fs-state info
	;;
esac
}

[ "$SNAPSHOT" = "magic" ] && {
case $1 in
unpack)
	do_snapshot_unpack
	;;
config_unpack)
	do_config_unpack
	;;
esac
}