#!/bin/sh


# Make sure to look at sysmocom-restore to check if the file would
# be restored right. Currently only some dirs get restored.
FILES="etc/sysmocom/backup.d"

# Pick some extra files
if [ -e /etc/sysmocom/backup.d/ ]; then
	for extra in `ls /etc/sysmocom/backup.d/*.files`;
	do
		echo "Add extras from $extra."
		FILES="$FILES `cat $extra`"
	done
fi

DATE=`date +%Y%m%d`


do_backup_files() {
	BACKUP_FILE="/home/root/sysmocom-backup_$DATE.tar"

	# 0. Sanity checking
	if [ -e $BACKUP_FILE ]; then
		echo "The backup file '$BACKUP_FILE' already exists. Exiting!"
		exit 1
	fi

	# 1. Create an empty archive..
	tar -cf $BACKUP_FILE --files-from=/dev/null

	# 2. Add all the files... we need
	for file in $FILES;
	do
		if [ -e "/$file" ]; then
			tar -rf $BACKUP_FILE --transform='s,^,content/,' -C / $file
		fi
	done

	# 3. Generate more information
	NAME="/tmp/backup.$RANDOM"
	mkdir $NAME
	opkg list_installed > $NAME/installed_packages
	/sbin/ifconfig | grep HWaddr | cut -d ' ' -f 11 > $NAME/mac_addr

	# 4. Add the more information
	tar -rf $BACKUP_FILE --transform='s,^,info/,' -C $NAME installed_packages mac_addr

	# 5. Create stable link
	ln -sf $BACKUP_FILE /home/root/sysmocom-backup.tar

	# 6.
	echo "The backup was stored to $BACKUP_FILE"
}

do_backup_files