minecraft init.d script

#!/bin/bash
# /etc/init.d/minecraft
# version 1.0 2013-02-08

### BEGIN INIT INFO
# Provides: minecraft
# Required-Start: $local_fs $remote_fs
# Required-Stop: $local_fs $remote_fs
# Should-Start: $network
# Should-Stop: $network
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
# Short-Description: Minecraft server
# Description: Starts the minecraft server
### END INIT INFO

#Settings
SERVICE='mc_server.jar'
USERNAME="minecraft"
MCPATH='/opt/CAH_147'
CRASHLOG_DB_PATH='/home/minecraft/crashlogs/'
JAVA_HOME='/usr/lib/jvm/java-7-oracle/jre'
CPU_COUNT=1
MEMORY_OPTS='-Xmx2G -Xms2G'
JAVA_OPTS='-Xincgc'
INVOCATION="${JAVA_HOME}/bin/java ${MEMORY_OPTS} ${JAVA_OPTS} -jar ${SERVICE} nogui"
BACKUPPATH='/home/minecraft/backup'
BACKUPDIR=`date +%b_%Y`
CONSOLELOG='/home/minecraft/console.log'

ME=`whoami`
as_user() {
    if [ $ME == $USERNAME ] ; then
        bash -c "$1"
    else
        su - $USERNAME -c "$1"
            fi
}

is_running() {
    if ps ax | grep -v grep | grep java | grep -v -i SCREEN | grep $SERVICE > /dev/null
        then
            return 0
    else
        return 1
            fi
}

mc_start() {
    if is_running
        then
            echo "Tried to start but $SERVICE was already running!"
            return 1
    else
        echo "$SERVICE was not running... starting."
            cd $MCPATH
            as_user "cd $MCPATH && byobu -dmS minecraft bash -c '$INVOCATION 2>&1 | tee $CONSOLELOG'"
            sleep 7
            if is_running
                then
                    echo "$SERVICE is now running."
                    return 0
            else
                echo "Could not start $SERVICE."
                    return 1
                    fi
                    fi
}

mc_saveoff() {
    if is_running
        then
            echo "$SERVICE is running... suspending saves"
            as_user "byobu -p 0 -S minecraft -X eval 'stuff \"say SERVER BACKUP STARTING. Server going readonly...\"\015'"
            as_user "byobu -p 0 -S minecraft -X eval 'stuff \"save-off\"\015'"
            as_user "byobu -p 0 -S minecraft -X eval 'stuff \"save-all\"\015'"
            sync
            sleep 10
    else
        echo "$SERVICE was not running. Not suspending saves."
            fi
}

mc_saveon() {
    if is_running
        then
            echo "$SERVICE is running... re-enabling saves"
            as_user "byobu -p 0 -S minecraft -X eval 'stuff \"save-on\"\015'"
            as_user "byobu -p 0 -S minecraft -X eval 'stuff \"say SERVER BACKUP ENDED. Server going read-write...\"\015'"
    else
        echo "$SERVICE was not running. Not resuming saves."
            fi
}

mc_kill() {
    pid=`ps ax | grep -v grep | grep java | grep -i SCREEN | grep $SERVICE | awk '{ print $1 }'`

        if [ -z $pid ]; then
            echo "unable to retrieve pid"
        else
            echo "killing process with pid $pid"
                kill $pid
                sleep 2

                if is_running; then
                    echo "$SERVICE could not be killed... still running"
                else
                    echo "$SERVICE killed"
                        fi
                        fi
}

mc_stop() {
    if is_running
        then
            echo "$SERVICE is running... stopping."

            as_user "byobu -p 0 -S minecraft -X eval 'stuff \"say SERVER SHUTTING DOWN IN 10 SECONDS. Saving map...\"\015'"
            as_user "byoub -p 0 -S minecraft -X eval 'stuff \"save-all\"\015'"
            sleep 10
            as_user "byoub -p 0 -S minecraft -X eval 'stuff \"stop\"\015'"
            sleep 12

    else
        echo "$SERVICE was not running."
            fi
            if is_running
                then
                    echo "$SERVICE could not be shut down cleanly... still running."
                    mc_kill
            else
                echo "$SERVICE is shut down."
                    fi
}

mc_backup() {
    echo "Backing up minecraft world"

        [ -d $BACKUPPATH/$BACKUPDIR ] || as_user "mkdir $BACKUPPATH/$BACKUPDIR"

        as_user "rdiff-backup $MCPATH $BACKUPPATH/$BACKUPDIR"

        echo "Backup complete"
}

mc_execservercmd() {
    if is_running
        then
            as_user "byobu -p 0 -S minecraft -X eval 'stuff \"$1\"\015'"
    else
        echo "$SERVICE was not running. Not executing command."
            fi
}

mc_dumpcrashlogs() {
    if is_running
        then
            as_user "cp $MCPATH/crash-reports/* $CRASHLOG_DB_PATH"
            as_user "mv $MCPATH/crash-reports/* $MCPATH/crash-reports.archive/"
            fi
}

#Start-Stop here
case "$1" in
    start)
        mc_start
        ;;
    stop)
        mc_stop
        ;;
    restart)
        mc_stop
        mc_start
        ;;
    backup)
        mc_saveoff
        mc_backup
        mc_saveon
        ;;
    execservercmd)
        mc_execservercmd "$2"
        ;;
    dumpcrashlogs)
        mc_dumpcrashlogs
        ;;
    status)
        if is_running
        then
            echo "$SERVICE is running."
        else
            echo "$SERVICE is not running."
        fi
        ;;

    *)
    echo "Usage: /etc/init.d/minecraft {start|stop|restart|backup|execservercmd|dumpcrashlogs|status}"
    exit 1
    ;;
esac

exit 0