#!/bin/bash

 # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 #
 # Package:		OurGrid 3.3.2
 #
 # Description:	 This shell script takes care of starting the core.
 #
 # Copyright (c) 2002-2004 Universidade Federal de Campina Grande 
 # 
 # - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

# Setting macros
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
OK=0
NOK=1

# Setting error codes (from 2 to 254)
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
ERR_STD_MISUSE=2

ERR_BASE=64
ERR_MGROOT_NOT_DEFINED=$[ERR_BASE + 0]
ERR_VARS_NOT_DEFINED=$[ERR_BASE + 1]

#
# Usage function to show how to use corepeer.
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
usage() {

	echo "CorePeer: Unknown command."
        echo
        echo "Corepeer commands are:"
        echo "  start           Starts corepeer on the local machine"
        echo "  stop            Stops corepeer on the local machine"
        echo "  status          Shows current corepeer status"
}

# Find MGROOT:                                          
# $0 is the executable $MGROOT/bin/mygrid or a link to it   
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
findmgroot(){

	PRG="$0"

	while [ -h "$PRG" ]; do
		ls=`ls -ld "$PRG"`
		link=`expr "$ls" : '.*-> \(.*\)$'`
		if expr "$link" : '.*/.*' > /dev/null; then
			PRG="$link"
		else
			PRG=`dirname "$PRG"`/"$link"
		fi
	done
	
	PRGDIR=`dirname "$PRG"`
	MGROOT=`cd "$PRGDIR/.." ; pwd`
	if [ -z "$MGROOT" ]; then
		echo "ERR_MGROOT_NOT_DEFINED"
		return $ERR_MGROOT_NOT_DEFINED
	else
		return $OK
	fi
}


# Set the $VAR $BIN and $LIB
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
setenvvars(){
	VAR=$MGROOT/var
	BIN=$MGROOT/bin
	LIB=$MGROOT/lib
	SAMPLE=$MGROOT/sample
	TEST=$MGROOT/test

	if [ -z "$VAR" ] || [ -z "$BIN" ] || [ -z "$LIB" ] || [ -z "$SAMPLE" ] || [ -z "$TEST" ]; then
		echo "ERR_VARS_NOT_DEFINED"
		return $ERR_VARS_NOT_DEFINED
	else
		return $OK
	fi
}


# Set the MGROOT and CLASSPATH including all libraries from $MGROOT/lib 
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
setclasspath(){
	mypath=.

	for i in `/bin/ls $LIB/*.jar`; do
		mypath=$mypath:$i
	done

	CLASSPATH=$mypath

	if [ -z "$CLASSPATH" ]; then 
		echo "ERR_VARS_NOT_DEFINED"
		return $ERR_CLASSPATH_NOT_DEFINED
	else
		return $OK
	fi
}

# Set the JAVAOPTION to invoke MyGrid classes
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
setjavaoptions(){
	JAVAOPTIONS=" -classpath $CLASSPATH -DMGROOT=$MGROOT -Dsun.net.inetaddr.ttl=0"
}

# +++++  Start CorePeer
start() {
	java $JAVAOPTIONS $main start &
	sleep 3
}

stop() {
	java $JAVAOPTIONS $main stop &
	sleep 3
}

status() {
	java $JAVAOPTIONS $main status
	exit $?
}

main="org.ourgrid.corepeer.ui.CommandManager"

# Check 
findmgroot && setenvvars && setclasspath && setjavaoptions

case "$1" in
 start)
  start
 ;;

 stop)
  stop
 ;;

 status)
  status
  exit $?
 ;;

 *)
  usage
  exit 5
 ;;

esac