pakfire: add function to extract backup includes.

this is needed to fix some addons with missing includes at the next
update. (eg. nagios).

config/rootfiles/core/61/filelists/files

@@ -1,6 +1,7 @@
 etc/system-release
 etc/issue
 etc/rc.d/init.d/collectd
+opt/pakfire/lib/functions.sh
 srv/web/ipfire/cgi-bin/index.cgi
 srv/web/ipfire/cgi-bin/ovpnmain.cgi
 var/ipfire/general-functions.pl

src/pakfire/lib/functions.sh

@@ -2,7 +2,7 @@
 ###############################################################################
 #                                                                             #
 # IPFire.org - A linux based firewall                                         #
-# Copyright (C) 2007  Michael Tremer & Christian Schmidt                      #
+# Copyright (C) 2007-2012  IPFire Team  <info@ipfire.org>                     #
 #                                                                             #
 # This program is free software: you can redistribute it and/or modify        #
 # it under the terms of the GNU General Public License as published by        #
@@ -28,6 +28,13 @@ extract_files() {
 	echo "...Finished."
 }
 
+extract_backup_includes() {
+	echo "Extracting backup includes..."
+	tar xvf /opt/pakfire/tmp/files --no-overwrite-dir -p --numeric-owner -C / \
+		var/ipfire/backup/addons/includes
+	echo "...Finished."
+}
+
 remove_files() {
 	echo "Removing files..."
 	for i in $(cat /opt/pakfire/db/rootfiles/${NAME}); do