#! /bin/sh
#
# Script to start the MX Channel Access server at boot time.
#
# This version of the script runs as root, but starts up mxca_server
# 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: EPICS Channel Access server control script for the MX data \
#              acquisition and control system.
# processname: mxca_server
#

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_MXCA_SERVER=${MXSBIN}/start_mxca_server

#---

# 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 is the MX Channel Access server 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

#---

MXCA_SERVER_OPTIONS_FILE=${MXDIR}/etc/mxca_server.opt

if [ -f ${MXCA_SERVER_OPTIONS_FILE} ]; then
	MXCA_SERVER_OPTIONS=`cat ${MXCA_SERVER_OPTIONS_FILE}`
fi

START_MXCA_SERVER_CMD="$START_MXCA_SERVER ${MXCA_SERVER_OPTIONS}"

#---

#echo "SCRIPTUSER=$SCRIPTUSER"
#echo "MXUSER=$MXUSER"
#echo "PREFIX=$PREFIX"
#echo "START_MXCA_SERVER_CMD=$START_MXCA_SERVER_CMD"

case $1 in
    'start' )
	echo "Starting the MX Channel Access server."

	# 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_MXCA_SERVER ]; then

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

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

			( $START_MXCA_SERVER_CMD < /dev/null >> ${MXLOG}/mxca_server.log 2>&1 & )
		fi
	fi
	;;
    'stop' )
	echo "Stopping the MX Channel Access server."

	if [ -f ${MXRUN}/mxca_server.pid ]; then
		MXCA_SERVER_PID=`cat ${MXRUN}/mxca_server.pid`
		kill $MXCA_SERVER_PID
		rm ${MXRUN}/mxca_server.pid
	fi
	;;
    'restart' )
	$0 stop
	echo "Waiting 2 seconds for the MX Channel Access server to shut down."
	sleep 2
	$0 start
	;;
    *)
	echo "Usage: ${MXDIR}/sbin/mxca_server {start|stop|restart}"
	;;
esac