#!/bin/sh
################################################################################
#
#  Rattail -- Retail Software Framework
#  Copyright © 2010-2018 Lance Edgar
#
#  This file is part of Rattail.
#
#  Rattail 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 3 of the License, or (at your option) any later
#  version.
#
#  Rattail 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
#  Rattail.  If not, see <http://www.gnu.org/licenses/>.
#
################################################################################
#
# This is a simple script which will output a single line of info, and exit
# with a return code which indicates status of a given Rattail daemon.  It was
# designed for use with Shinken monitoring.  Invoke like so:
#
#    check-rattail-daemon NAME
#
# Where NAME refers to the service, e.g. 'rattail-datasync'.  Exit code may be:
#
#  * 0 = daemon is confirmed running
#  * 2 = daemon is confirmed *not* running
#  * 3 = unknown state
#
################################################################################

NAME="$1"
if [ "$NAME" = "" ]; then
    echo "Usage: check-rattail-daemon NAME"
    exit 3
fi

PIDFILE="/var/run/rattail/$NAME.pid"
if [ ! -f "$PIDFILE" ]; then
    echo "PID file not found: $PIDFILE"
    exit 2
fi

PID=`cat $PIDFILE`
if [ "$PID" = "" ]; then
    echo "File exists but contains no PID: $PIDFILE"
    exit 3
fi
ps -p $PID >/dev/null
if [ ! $? ]; then
    echo "No process found for PID $PID; per file: $PIDFILE"
    exit 2
fi

echo "Rattail daemon $NAME is running with PID $PID"
exit 0