#!/usr/bin/python2.7
# -*- coding: utf-8 -*-
#
# Univention Management Console module:
#   Control computers of pupils in a room
#
# Copyright 2012-2016 Univention GmbH
#
# http://www.univention.de/
#
# All rights reserved.
#
# The source code of this program is made available
# under the terms of the GNU Affero General Public License version 3
# (GNU AGPL V3) as published by the Free Software Foundation.
#
# Binary versions of this program provided by Univention to you as
# well as other copyrighted, protected or trademarked materials like
# Logos, graphics, fonts, specific documentations and configurations,
# cryptographic keys etc. are subject to a license agreement between
# you and Univention and not subject to the GNU AGPL V3.
#
# In the case you use this program under the terms of the GNU AGPL V3,
# the program is provided in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public
# License with the Debian GNU/Linux or Univention distribution in file
# /usr/share/common-licenses/AGPL-3; if not, see
# <http://www.gnu.org/licenses/>.

from univention.config_registry import ConfigRegistry, handler_set, handler_unset
from optparse import OptionParser
import os
import subprocess

if __name__ == '__main__':
	parser = OptionParser()

	parser.add_option( '-r', '--remove', action = 'append', dest = 'remove', default = [] )
	parser.add_option( '-e', '--extract', action = 'append', dest = 'extract', default = [] )

	options, hosts = parser.parse_args()

	ucr = ConfigRegistry()
	ucr.load()

	hosts = set( hosts )
	vset = {}

	# extract values
	for variable in options.extract:
		if ucr.get(variable):
			old = set( ucr[ variable ].split( ' ' ) )
		else:
			old = set()
		new = old.difference( hosts )
		if new:
			vset[ variable ] = ' '.join( new )
		else:
			options.remove.append( variable )

	handler_set( map( lambda x: '%s=%s' % x, vset.items() ) )

	# remove values
	handler_unset( options.remove )
	
	#reload cups
	if os.path.exists('/etc/init.d/cups'):
		subprocess.call(['/etc/init.d/cups', 'reload'])
