#! /bin/bash
#
# Copyright (C) 2020 Laurent Poujoulat <lpoujoulat@april.org>
#
# This file is part of valise.chapril.org
#
# This script is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# This program is distributed 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
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#

# ================================================
# This checks for updates of nextcloud components.
# If any update is present, they are listed in human readable form on stdout, and 1 is returned,
# and if everything is OK, tell it on stdout "OK", and returns 0.
#
# This is a Nagios plugin and thus follows its return code standards
# ================================================



# Configuration data
NEXTCLOUD_ROOT="/var/www/valise.chapril.org"

# Constants for return codes
readonly NS_OK=0
readonly NS_WARNING=1
readonly NS_CRITICAL=1
readonly NS_UNKNOWN=1


# Returns script usage
function usage() 
{
	echo "Usage: $(basename $0)"
}

# Main entry point

# By default, we assume to fail
EXIT_RESULT=${NS_UNKNOWN}

# Usage check
if [ "$#" -ne 0 ]
then
	usage
else

	# Currently, nor the serverinfo API, nor the occ command has a clean way of checking both the core and apps update status
	# So we trick this by calling the occ update:check command and processing the output
	cd ${NEXTCLOUD_ROOT}
	UPDATE_LIST=$(sudo -u www-data php occ update:check)

	if [ $? != 0 ]
	then
		EXIT_RESULT=${NS_CRITICAL}
        	echo "Failed to check Nextcloud update"
	else

		# OK, we have the human readable status, let's process it
		echo ${UPDATE_LIST} | grep -q "Everything up to date"

		if [ $? == 0 ]
		then 
			EXIT_RESULT=${NS_OK}
			echo "OK"
		else
			EXIT_RESULT=${NS_WARNING}
			echo ${UPDATE_LIST}
		fi

	fi

fi

exit ${EXIT_RESULT}