#!/bin/sh

# Copyrights     : CNRS
# Author         : Oleg Lodygensky
# Acknowledgment : XtremWeb-HEP is based on XtremWeb 1.8.0 by inria : http://www.xtremweb.net/
# Web            : http://www.xtremweb-hep.org
# 
#      This file is part of XtremWeb-HEP.
#
#    XtremWeb-HEP 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.
#
#    XtremWeb-HEP 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 XtremWeb-HEP.  If not, see <http://www.gnu.org/licenses/>.
#
#



#
#
# File    : xtremweb.jra2
# Date    : Novembre 26th, 2008
# Purpose : This starts/stops xtremweb jra2 daemon
# Params  : [start | stop | restart]
#

# chkconfig: 345 99 99
# description: XWHEP DesktopGrid brigde element


#
# This is the PERL script to launch
#
PERLSCRIPTNAME="xtremweb.jra2.pl"

#
# If 1, this uses SU to launch the service under a given identity
#  (XWUSER in xtremwebconf.sh)
#
SUDO=1


######################################################
# This starts xtremweb bridge part as daemon
# return : 0 on success
#          3 if already running
######################################################
start () {
    if [ ! -f $PIFILE ] ; then
        echo "$PROG is already running"
        return
    fi

    if [ -f $LOGFILE ]; then
        mv -f $LOGFILE $LOGBAKFILE
    fi
    touch $LOGFILE
    chown $XWUSER $LOGFILE


    echo "`date` [`uname -n` $PROG] INFO : starting $PROG" >> $LOGFILE

    #
    # Try to determine SU usage...
    #
    SU=""
    MINUS=""
    if [ $SUDO -eq 1 ]; then
	su -l $XWUSER -c exit > /dev/null  2>& 1
	if ( [ $? -eq 0 ] ); then
            SU="su - -l $XWUSER"
	else
            su $XWUSER -c exit - > /dev/null  2>&1
            if ( [ $? -eq 0 ] ); then
		SU="su - $XWUSER"
		MINUS=" -"
            else
		echo "Can't determine SU usage :("
		echo "`date` [`uname -n` $PROG] ERROR : can't find SU usage" >> $LOGFILE
		return $ERRUSER
            fi
	fi
    fi


    #
    # Try to determine default shell for user $XWUSER
    #
    
    USHELL="unknown"
    [ -x /bin/ksh  ] && USHELL="/bin/ksh"
    [ -x /bin/zsh  ] && USHELL="/bin/zsh"
    [ -x /bin/csh  ] && USHELL="/bin/csh"
    [ -x /bin/tcsh ] && USHELL="/bin/tcsh"
    [ -x /bin/sh   ] && USHELL="/bin/sh"
    [ -x /bin/bash ] && USHELL="/bin/bash"


    [ $SUDO -eq 1 ] && SU="$SU -s $USHELL -c"
    
    case $USHELL in
        "/bin/sh"|"/bin/bash"|"/bin/ksh"|"/bin/zsh" )
	    if [ $SUDO -eq 1 ]; then
		echo "$SU $ROOTDIR/bin/$PERLSCRIPTNAME $* >> $LOGFILE 2>&1 & $MINUS" >> $LOGFILE
		$SU "$ROOTDIR/bin/$PERLSCRIPTNAME *$ >> $LOGFILE 2>&1 & $MINUS"
	    else
		echo "$ROOTDIR/bin/$PERLSCRIPTNAME *$ >> $LOGFILE 2>&1 &" >> $LOGFILE
		`$ROOTDIR/bin/$PERLSCRIPTNAME $* >> $LOGFILE 2>&1 &`
	    fi
            ;;
        "/bin/csh"|"/bin/tcsh" )
	    if [ $SUDO -eq 1 ]; then
		echo "$SU $ROOTDIR/bin/$PERLSCRIPTNAME $* >>& $LOGFILE & $MINUS"  >> $LOGFILE
		$SU "$ROOTDIR/bin/$PERLSCRIPTNAME $* >>& $LOGFILE & $MINUS"
	    else
		echo "$ROOTDIR/bin/$PERLSCRIPTNAME $* >>& $LOGFILE &"  >> $LOGFILE
		`$ROOTDIR/bin/$PERLSCRIPTNAME $* >>& $LOGFILE &`
	    fi
            ;;
        "unknown" )
            echo "Can't find any shell :("
	    echo "`date` [`uname -n` $PROG] ERROR : can't find any shell" >> $LOGFILE
            return $ERRUSER
            ;;
    esac
    
    PID=`ps auxwww | grep $PERLSCRIPTNAME | grep $XWUSER | grep -v grep | sed "s/[[:space:]][[:space:]]*/ /g" | cut -d " " -f 2`

    if [ "X$PID" = "X" ] ; then
        echo "$PROG : launch error"
	echo "`date` [`uname -n` $PROG] ERROR : launch error" >> $LOGFILE
        return $ERRSTATE
    fi

    [ "X$LOGGERLEVEL" = "Xdebug" ] && echo "$PID  => $PIDFILE"
    echo $PID > $PIDFILE
    echo "`date` [`uname -n` $PROG] INFO : $PROG started" >> $LOGFILE
    echo "$PROG started"
}


######################################################
# This stops xtremweb part
# return : 0 on success
#          3 if not running
######################################################
stop(){

    kill -9 `cat $PIDFILE` > /dev/null 2>&1
    rm -f $PIDFILE
    echo "$PROG stopped"
}

######################################################
# This restarts xtremweb part
######################################################
restart(){
    stop
    start $*
}



######################################################
# This retreives the status
# return : always 0 
######################################################
status(){

    if [ ! -f $PIFILE ] ; then
        echo "$PROG is running"
    else
        echo "$PROG is not running"
    fi
}


######################################################
# Main
######################################################


#
# resolve symlinks
#
PRG=$0

while [ -h "$PRG" ]; do
    ls=`ls -ld "$PRG"`
    link=`expr "$ls" : '^.*-> \(.*\)$' 2>/dev/null`
    if expr "$link" : '^/' 2> /dev/null >/dev/null; then
        PRG="$link"
    else
        PRG="`dirname $PRG`/$link"
    fi
done

progdir=`dirname $PRG`
progname=`basename $0`

#
# loading default values
#
PROG=$progname
#ROOTDIR="$progdir/.."
#[ "$ROOTDIR" = "./.." ] && ROOTDIR=`pwd`/..

currentDir=`pwd`
cd $progdir
ROOTDIR=`pwd`/..
cd $currentDir

. $ROOTDIR/bin/xtremwebconf.sh > /dev/null  2>&1

#
# Parse command line parameters
#
case "$ACTION" in
    start)
        start $*
        ;;
    status)
        status
        exit 0
        ;;
    stop)
        stop
        ;;
    restart)
        restart $*
        ;;
    *)
        echo "Usage : $0 {start | stop | restart | status}"
esac


#
# End of file
#