#!/usr/bin/python3
# -*- coding: utf-8 -*-
#
# Univention Monitoring
#
# Copyright 2004-2022 Univention GmbH
#
# https://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
# <https://www.gnu.org/licenses/>.

import univention.lib.fstab
from univention.config_registry import ucr
from univention.monitoring import Alert


class FSMountCheck(Alert):

	def write_metrics(self):
		nfscnt = 0
		mounted = 0
		umounted = 0
		msg = ''

		# read currently mounted filesystems
		try:
			mounts = univention.lib.fstab.File('/proc/mounts')
		except (OSError, EOFError) as err:
			self.write_metric('univention_nfsstatus', -1)
			self.log.debug('error while reading /proc/mounts, error: %s' % (err,))
			return

		mountlist = {
			entry.spec: entry.mount_point
			for entry in mounts.get(['nfs'])
		}

		# read desired mounted filesystems
		try:
			fstab = univention.lib.fstab.File('/etc/fstab')
		except (OSError, EOFError) as err:
			self.write_metric('univention_nfsstatus', -1)
			self.log.debug('error while reading /etc/fstab, EOF error: %s' % (err,))
			return

		for entry in fstab.get(['nfs']):
			if ucr.is_true('monitoring/nfs/allnfs') or not entry.hasopt('noauto'):
				source = entry.spec
				nfscnt += 1
				if source in mountlist and mountlist[source] == entry.mount_point:
					mounted += 1
				else:
					umounted += 1
					msg += '"%s" not mounted, ' % source

		msg = msg.rstrip(', ')
		if nfscnt == 0:
			msg = 'no nfs shares in /etc/fstab present'
			state = -1
		elif umounted == 0:
			state = 0
			msg = '%s OK, %s - all nfs shares are correctly mounted' % (mounted, umounted)
		else:
			state = 1
			msg = '%s OK, %s - %s' % (mounted, umounted, msg)

		self.write_metric('univention_nfsstatus', state)
		self.log.debug(msg)


if __name__ == '__main__':
	FSMountCheck.main()
