#! /bin/sh
#
# Script to start the MX server and MX update processes at boot time.
#
# This version of the script runs as root, but starts up mxserver and
# mxupdate under a non-root user account which is 'mx' by default.
#
# The following is for the use of the Red Hat Linux chkconfig command:
#
# chkconfig: 2345 99 01
# description: Server control script for the MX data acquisition \
#              and control system.
# processname: mxserver
#

if [ x$MXDIR = x ]; then
	MXDIR=/opt/mx
fi

MXBIN=${MXDIR}/bin
MXETC=${MXDIR}/etc
MXLOG=${MXDIR}/log
MXRUN=${MXDIR}/run
MXSBIN=${MXDIR}/sbin

MX_LOCAL_CONFIG=${MXETC}/mx_local_config

START_MXSERVER=${MXSBIN}/startmxserver
START_MXUPDATE=${MXSBIN}/startmxupdate

#---

# The following makes sure that whoami is in the path on Solaris 2 and SunOS 4
# and that libMx.dll is in the path on Cygwin.

PATH="$PATH:$MXBIN:/usr/ucb"

export PATH

# Find out which user is running this script.

SCRIPTUSER=`whoami`

# Which user are the MX server and update processes to be run as?

MXUSER_FILE=${MXDIR}/etc/mxuser.dat

if [ -f ${MXUSER_FILE} ]; then
	MXUSER=`cat ${MXUSER_FILE}`
else
	MXUSER=mx
fi

# Construct a prefix for the server startup commands below.

if [ $SCRIPTUSER = $MXUSER ]; then
	PREFIX=
elif [ $SCRIPTUSER = "root" ]; then
	PREFIX="/bin/su $MXUSER -c"
else
	echo "This script must be run either as the MX user '$MXUSER' or as 'root'."
	echo "You are '$SCRIPTUSER', so this script is aborting."
	exit 1
fi

#---

MXSERVER_OPTIONS_FILE=${MXDIR}/etc/mxserver.opt

if [ -f ${MXSERVER_OPTIONS_FILE} ]; then
	MXSERVER_OPTIONS=`cat ${MXSERVER_OPTIONS_FILE}`
fi

START_MXSERVER_CMD="$START_MXSERVER ${MXSERVER_OPTIONS}"

#---

MXUPDATE_OPTIONS_FILE=${MXDIR}/etc/mxupdate.opt

if [ -f ${MXUPDATE_OPTIONS_FILE} ]; then
	MXUPDATE_OPTIONS=`cat ${MXUPDATE_OPTIONS_FILE}`
fi

START_MXUPDATE_CMD="$START_MXUPDATE ${MXUPDATE_OPTIONS}"

#---

#echo "SCRIPTUSER=$SCRIPTUSER"
#echo "MXUSER=$MXUSER"
#echo "PREFIX=$PREFIX"
#echo "START_MXSERVER_CMD=$START_MXSERVER_CMD"
#echo "START_MXUPDATE_CMD=$START_MXUPDATE_CMD"

case $1 in
    'start' )
	echo "Starting the MX servers."

	# If possible, fix any outstanding permission problems.

	if [ $SCRIPTUSER = "root" ]; then
		chown $MXUSER ${MXDIR}/log
		chown $MXUSER ${MXDIR}/run
		chown $MXUSER ${MXDIR}/state

		chown $MXUSER ${MXDIR}/log/*.log
	fi

	if [ -f $MX_LOCAL_CONFIG ]; then
		. $MX_LOCAL_CONFIG
	fi

	if [ -x $START_MXSERVER ]; then

		if [ $SCRIPTUSER = "root" ]; then
			$PREFIX "touch ${MXLOG}/mxserver.log"

			( $PREFIX "$START_MXSERVER_CMD" < /dev/null >> ${MXLOG}/mxserver.log 2>&1 & )
		else
			touch ${MXLOG}/mxserver.log

			( $START_MXSERVER_CMD < /dev/null >> ${MXLOG}/mxserver.log 2>&1 & )
		fi

		if [ -x $START_MXUPDATE ]; then
			if [ $SCRIPTUSER = "root" ]; then
				$PREFIX "touch ${MXLOG}/mxupdate.log"

				( $PREFIX "$START_MXUPDATE_CMD" < /dev/null >> ${MXLOG}/mxupdate.log 2>&1 & )
			else
				touch ${MXLOG}/mxupdate.log

				( $START_MXUPDATE_CMD < /dev/null >> ${MXLOG}/mxupdate.log 2>&1 & )
			fi
		fi
	fi
	;;
    'stop' )
	echo "Stopping the MX servers."

	if [ -f ${MXRUN}/mxserver.pid ]; then
		MXSERVER_PID=`cat ${MXRUN}/mxserver.pid`
		kill $MXSERVER_PID
		rm ${MXRUN}/mxserver.pid
	fi

	if [ -f ${MXRUN}/mxupdate.pid ]; then
		MXUPDATE_PID=`cat ${MXRUN}/mxupdate.pid`
		kill $MXUPDATE_PID
		rm ${MXRUN}/mxupdate.pid
	fi
	;;
    'restart' )
	$0 stop
	echo "Waiting 5 seconds for the servers to shut down."
	sleep 5
	$0 start
	;;
    *)
	echo "Usage: ${MXDIR}/sbin/mx {start|stop|restart}"
	;;
esac