Nagios-compatible script for reporting the replag of a mod_tile tile server

check_replag.sh

#!/bin/bash -e
# check_replag Nagios plugin for monitoring mod_tile replag value
# Copyright (c) 2015
# Written by James Badger

# Released under the GNU Public License
#
# 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
# the Free Software Foundation; either version 2 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

WARN=600
CRIT=1800
STATEFILE=/var/lib/mod_tile/.osmosis/state.txt

if [ ! -f $STATEFILE ]; then
        echo "CRIT - state file not found"
        exit 3
fi

repdate=$(sed -e '/^timestamp=/!d' -e 's/.*=//' -e 's/Z//' -e 's/T/Z/' -e 's/\\//' -e 's/\\//' -e q $STATEFILE)
repsec=$(date --date=$repdate +%s)
nowsec=$(date +%s)
diff=$(expr $nowsec - $repsec)

if (( $diff > $CRIT )); then
        echo "CRIT - OSM replag: ${diff}s | replag=${diff}s;$WARN;$CRIT;0"
        exit 2
elif (( $diff > $WARN )); then
        echo "WARN - OSM replag: ${diff}s | replag=${diff}s;$WARN;$CRIT;0"
        exit 1
else
        echo "OK - OSM replag: ${diff}s | replag=${diff}s;$WARN;$CRIT;0"
        exit 0
fi