minecraft runscript

mc

#!/bin/bash
USERNAME="minecraft"
SERVICE='forge.jar'
JAVA_OPTS="-Xmx8G -Xms8G"

MCPATH="/srv/$USERNAME"
BACKUPPATH="$MCPATH/backup"
BACKUPARCHIVEPATH=$BACKUPPATH/archive

INVOCATION="/usr/bin/java ${JAVA_OPTIONS} -jar $SERVICE nogui"
PORT=$(grep server-port $MCPATH/server.properties | cut -d '=' -f 2)

if [ -z "$PORT" ]; then
	PORT=25565
fi

if [ $(whoami) != $USERNAME ]; then
	su $USERNAME -l -c "$(readlink -f $0) $*"
	exit $?
fi

is_running() {
	if `tmux has-session -t mc$PORT 2> /dev/null`; then
		list=$(tmux lsp -F '#{session_name}' | grep "mc$PORT" | sort -r)
		for line in $list; do
			pid=`echo $line | cut -d: -f2`
			app=`ps p $pid | tail -1 | awk '{print $5}'`
			if `echo $app | grep $INVOCATION > /dev/null ; echo $?`; then
				return 0
			fi
			
		done
		
		return 1
	else
		return 1
	fi
}

mc_start() {
	if is_running; then
		echo "Tried to start but $SERVICE was already running!"
	else
		echo "$SERVICE was not running... starting."
		
		cd $MCPATH
		tmux new-session -d -n mc$PORT -s mc$PORT $INVOCATION
	fi
}

mc_stop() {
	if is_running; then
		echo "$SERVICE is running... stopping."
		
		mc_exec "say SERVER SHUTTING DOWN IN 10 SECONDS! Saving map..."
		mc_exec "save-all"
		sleep 10
		mc_exec "stop"
		
		for (( i=0; i < 20; i++ )); do
			is_running || break
			echo -n .
			sleep 1
		done
		
		echo
	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_kill() {
	pid=$(cat $MCPATH/java.pid)

	echo "terminating process with pid $pid"
	kill $pid
	
	for (( i=0; i < 10; i++ )); do
		is_running || break
		sleep 1
	done

	if is_running; then
		echo "$SERVICE could not be terminated, killing..."
		kill -SIGKILL $pid
		echo "$SERVICE killed"
	else
		echo "$SERVICE terminated"
	fi
}

mc_saveoff() {
	if is_running; then
		echo "$SERVICE is running... suspending saves"
		mc_exec "say SERVER BACKUP STARTING! Server going readonly..."
		mc_exec "save-off"
		mc_exec "save-all"
		sleep 10
	else
		echo "$SERVICE was not running. Not suspending saves."
	fi
}

mc_saveon() {
	if is_running; then
		echo "$SERVICE is running... re-enabling saves"
		mc_exec "save-on"
		mc_exec "say SERVER BACKUP ENDED! Server going read-write..."
	else
		echo "$SERVICE was not running. Not resuming saves."
	fi
}

mc_backup() {
	echo "Backing up minecraft world"
	backupdir=`date "+%F %T"`
	7z a -r -y "$BACKUPPATH/$backup.7z" $MCPATH/world >/dev/null
	echo "Backup complete"
}

mc_exec() {
	if is_running; then
		tmux send-keys -t mc$PORT "$@^M"
	else
		echo "$SERVICE was not running. Not executing command."
	fi
}

case "$1" in
	start)
		mc_start
	;;
	
	stop)
		mc_stop
	;;
  
	restart)
		mc_stop
		mc_start
	;;
  
	backup)
		mc_saveoff
    		mc_backup
    		mc_saveon
	;;

	exec)
    		shift
    		mc_exec "$@"
    	;;
    	
    	exec)
    		shift
    		set -- say "$@"
    		mc_exec "$@"
    	;;
  
  	status)
    		if is_running; then
			echo "$SERVICE is running."
		else
			echo "$SERVICE is not running."
		fi
    	;;

  	*)
  		echo "Usage: $(readlink -f $0) {start|stop|restart|backup|exec|say|status}"
  		exit 1
	;;
esac

exit 0