#!/bin/bash

### BEGIN INIT INFO
# Provides:          xtreemfs-@SHORT_SERVICE_NAME_LOWERCASE@
# Required-Start:    $network $remote_fs
# Required-Stop:     $network $remote_fs
# Should-Start:      @SHOULD_START@
# Should-Stop:       $null
# Default-Start:     3 5
# Default-Stop:      0 1 2 6
# Short-Description: XtreemFS @SHORT_SERVICE_NAME@
# Description:       XtreemFS @LONG_SERVICE_NAME@ (@SHORT_SERVICE_NAME@). http://www.xtreemfs.org/
### END INIT INFO

# Source function library.
if [ -e /lib/lsb/init-functions ]; then
    . /lib/lsb/init-functions
else
    . /etc/init.d/functions
fi

XTREEMFS_USER=xtreemfs

PID=/var/run/xtreemfs_@SHORT_SERVICE_NAME_LOWERCASE@.pid

CONFIG=/etc/xos/xtreemfs/@SHORT_SERVICE_NAME_LOWERCASE@config.properties

LOG=/var/log/xtreemfs/@SHORT_SERVICE_NAME_LOWERCASE@.log

if [ -z $JAVA_HOME ]; then
    export JAVA_HOME=/usr
fi
JAVA_CALL="$JAVA_HOME/bin/java -ea -cp /usr/share/java/XtreemFS.jar:/usr/share/java/BabuDB.jar:/usr/share/java/Flease.jar:/usr/share/java/protobuf-java-2.5.0.jar:/usr/share/java/Foundation.jar:/usr/share/java/jdmkrt.jar:/usr/share/java/jdmktk.jar:/usr/share/java/commons-codec-1.3.jar"

# For SELinux we need to use 'runuser' not 'su'
if [ -x "/sbin/runuser" ]; then
    SU="/sbin/runuser"
else
    SU="/bin/su"
fi

pre_check() {
    exists=`grep -c $XTREEMFS_USER /etc/passwd`
    if [ $exists -eq 0 ]; then
        echo "User $XTREEMFS_USER does not exist. Create it first."
        exit 1
    fi
    log_directory=`dirname $LOG`
    if [ ! -e $log_directory ]; then
        echo "Directory for logfiles $log_directory does not exist. Create it first."
        exit 1
    fi
}

start() {
    if [ -f $PID ]; then
        PROCPID=`cat $PID`
        if [ -e /proc/$PROCPID ];then
            echo "XtreemFS @LONG_SERVICE_NAME@ (@SHORT_SERVICE_NAME@) already started"
            return 0
        else
            echo -n "Previous XtreemFS @LONG_SERVICE_NAME@ (@SHORT_SERVICE_NAME@) was not shutdown correctly (PID $PROCPID). "
        fi
    fi

    pre_check

    echo >> $LOG
    date >> $LOG
    echo -e "Starting XtreemFS @LONG_SERVICE_NAME@ (@SHORT_SERVICE_NAME@)...\n\n" >> $LOG

    echo -n "Starting XtreemFS @LONG_SERVICE_NAME@ (@SHORT_SERVICE_NAME@)..."
    $SU -s /bin/bash $XTREEMFS_USER -c "$JAVA_CALL org.xtreemfs.@SHORT_SERVICE_NAME_LOWERCASE@.@SHORT_SERVICE_NAME@ $CONFIG" >> $LOG 2>&1 &
    PROCPID=$!
    echo $PROCPID > $PID
    sleep 1s

    if [ -e /proc/$PROCPID ]; then
        echo "success"
    else
        echo "failed"
        return 1
    fi

    return 0
}

stop() {
    result=0
    if [ -f $PID ]; then
        echo -n "Stopping XtreemFS @LONG_SERVICE_NAME@ (@SHORT_SERVICE_NAME@)..."
        killproc -p $PID $SU
        result=$?
        if [ $result -eq 0 ]; then
            rm -f $PID
            echo "success"
        else
            echo "failed"
        fi
    else
        echo "XtreemFS @LONG_SERVICE_NAME@ (@SHORT_SERVICE_NAME@) is not running"
    fi

    return $result
}

status() {
    if [ -f $PID ]; then
        PROCPID=`cat $PID`
        if [ ! -e /proc/$PROCPID ]; then
            echo "XtreemFS @LONG_SERVICE_NAME@ (@SHORT_SERVICE_NAME@) has crashed"
            return 1
        else
            echo "XtreemFS @LONG_SERVICE_NAME@ (@SHORT_SERVICE_NAME@) is running"
            return 0
        fi
    else
        echo "XtreemFS @LONG_SERVICE_NAME@ (@SHORT_SERVICE_NAME@) is not running"
        return 3
    fi
}

# See how we were called.
case "$1" in
    start)
        start
        result=$?
        ;;
    stop)
        stop
        result=$?
        ;;
    status)
        status
        result=$?
        ;;
    reload)
        result=0
        ;;
    restart)
        stop && sleep 1 && start
        result=$?
        ;;
    try-restart)
        ## Stop the service and if this succeeds (i.e. the
        ## service was running before), start it again.
        $0 status >/dev/null
        if [ $? -eq 0 ]; then
          $0 restart
          result=$?
        else
          result=0
        fi
        ;;
    *)
        echo -e "Usage: $0 {start|stop|restart|reload|status|try-restart}\n"
        result=1
        ;;
esac

exit $result