#!/bin/bash
#
# plc	Manages all PLC services on this machine
#
# chkconfig: 2345 99 5
#
# description:	Manages all PLC services on this machine
#
# $Id: host.init,v 1.5 2006/04/18 15:39:34 thierry Exp $
#

PATH=/sbin:/bin:/usr/bin:/usr/sbin

# Source function library.
. /etc/init.d/functions

# Source configuration
if [ -f /etc/sysconfig/plc -a -z "${PLC_ROOT}${PLC_DATA}" ] ; then
    . /etc/sysconfig/plc
fi

# Total number of errors
ERRORS=0

# Count the exit status of the last command
check ()
{
    ERRORS=$(($ERRORS+$?))
}

mounted ()
{
    if cut -d' ' -f2 /proc/mounts | grep -q "$1" ; then
	return 0
    else
	return 1
    fi
}

mount_plc ()
{
    echo -n $"Mounting PLC: "

    if ! mounted $PLC_ROOT ; then
	if ! e2fsck -a $PLC_ROOT.img | logger -t "PLC" ; then
	    e2fsck $PLC_ROOT.img
	fi
	mount -o loop $PLC_ROOT.img $PLC_ROOT
	check
    fi
    if ! mounted $PLC_ROOT/data ; then
	mount -t none -o bind,rw $PLC_DATA $PLC_ROOT/data
	check
    fi
    if ! mounted $PLC_ROOT/proc ; then
	mount -t proc none $PLC_ROOT/proc
	check
    fi

    [ $ERRORS -eq 0 ] && success $"PLC unmount" || failure $"PLC unmount"	
    echo

}

start ()
{
    mount_plc 

    chroot $PLC_ROOT /sbin/service plc $PLC_OPTIONS start $*
    check
}

umount_plc ()
{
    echo -n $"Unmounting PLC: "

    for dir in $PLC_ROOT/proc $PLC_ROOT/data $PLC_ROOT ; do
	if mounted $dir ; then
	    umount $dir
	    check
	fi
    done

    [ $ERRORS -eq 0 ] && success $"PLC unmount" || failure $"PLC unmount"	
    echo
}

stop ()
{
    if mounted $PLC_ROOT ; then
	chroot $PLC_ROOT /sbin/service plc $PLC_OPTIONS stop $*
	check
    fi

    umount_plc

}

mount_status ()
{
  lines=$(mount | grep $PLC_ROOT)
  if [ -z "$lines" ] ; then
    echo "==== $PLC_ROOT is *not* mounted"
  else
    echo "==== The following mount points remain active"
    echo "$lines"
  fi
}

# Get command
shift $(($OPTIND - 1))
command=$1

# Get step(s)
shift 1

case "$command" in
    start|stop)
	$command $*
	;;

    restart)
	stop $*
	start $*
	;;

    mount|umount)
        ${command}_plc $*
	;;

    mountstatus)
        mount_status $*
	;;
  
    *)
	echo "Usage: $0 {start|stop|restart|mount|umount|mountstatus}"
	RETVAL=1
	;;
esac

exit $ERRORS