The Mess Hall

#!/bin/bash
# /etc/init.d/minecraft
# version 0.3.2 2011-01-27 (YYYY-MM-DD)

### 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='minecraft_server.jar'
USERNAME="minecraft"
MCPATH='/home/minecraft/minecraft'
CPU_COUNT=1
INVOCATION="java -Xmx1024M -Xms1024M -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalPacing -XX:ParallelGCThreads=$CPU_COUNT -XX:+AggressiveOpts -jar minecraft_server.jar nogui"
BACKUPPATH='/media/remote.share/minecraft.backup'

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

mc_start() {
if ps ax | grep -v grep | grep -v -i SCREEN | grep $SERVICE > /dev/null
then
echo "Tried to start but $SERVICE was already running!"
else
echo "$SERVICE was not running... starting."
cd $MCPATH
as_user "cd $MCPATH && screen -dmS minecraft $INVOCATION"
sleep 7
if ps ax | grep -v grep | grep -v -i SCREEN | grep $SERVICE > /dev/null
then
echo "$SERVICE is now running."
else
echo "Could not start $SERVICE."
fi
fi
}

mc_saveoff() {
if ps ax | grep -v grep | grep -v -i SCREEN | grep $SERVICE > /dev/null
then
echo "$SERVICE is running... suspending saves"
as_user "screen -p 0 -S minecraft -X eval 'stuff \"say SERVER BACKUP STARTING. Server going readonly...\"\015'"
as_user "screen -p 0 -S minecraft -X eval 'stuff \"save-off\"\015'"
as_user "screen -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 ps ax | grep -v grep | grep -v -i SCREEN | grep $SERVICE > /dev/null
then
echo "$SERVICE is running... re-enabling saves"
as_user "screen -p 0 -S minecraft -X eval 'stuff \"save-on\"\015'"
as_user "screen -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_stop() {
if ps ax | grep -v grep | grep -v -i SCREEN | grep $SERVICE > /dev/null
then
echo "$SERVICE is running... stopping."
as_user "screen -p 0 -S minecraft -X eval 'stuff \"say SERVER SHUTTING DOWN IN 10 SECONDS. Saving map...\"\015'"
as_user "screen -p 0 -S minecraft -X eval 'stuff \"save-all\"\015'"
sleep 10
as_user "screen -p 0 -S minecraft -X eval 'stuff \"stop\"\015'"
sleep 7
else
echo "$SERVICE was not running."
fi
if ps ax | grep -v grep | grep -v -i SCREEN | grep $SERVICE > /dev/null
then
echo "$SERVICE could not be shut down... still running."
else
echo "$SERVICE is shut down."
fi
}


mc_update() {
if ps ax | grep -v grep | grep -v -i SCREEN | grep $SERVICE > /dev/null
then
echo "$SERVICE is running! Will not start update."
else
MC_SERVER_URL=http://www.minecraft.net/download/minec ... ar?v=`date | sed "s/[^a-zA-Z0-9]/_/g"`
as_user "cd $MCPATH && wget -q -O $MCPATH/minecraft_server.jar.update $MC_SERVER_URL"
if [ -f $MCPATH/minecraft_server.jar.update ]
then
if `diff $MCPATH/minecraft_server.jar $MCPATH/minecraft_server.jar.update >/dev/null`
then
echo "You are already running the latest version of $SERVICE."
else
as_user "mv $MCPATH/minecraft_server.jar.update $MCPATH/minecraft_server.jar"
echo "Minecraft successfully updated."
fi
else
echo "Minecraft update could not be downloaded."
fi
fi
}

mc_backup() {
echo "Backing up minecraft world"
if [ -d $BACKUPPATH/world_`date "+%Y.%m.%d"` ]
then
for i in 1 2 3 4 5 6
do
if [ -d $BACKUPPATH/world_`date "+%Y.%m.%d"`-$i ]
then
continue
else
as_user "cd $MCPATH && cp -r world $BACKUPPATH/world_`date "+%Y.%m.%d"`-$i"
break
fi
done
else
as_user "cd $MCPATH && cp -r world $BACKUPPATH/world_`date "+%Y.%m.%d"`"
echo "Backed up world"
fi
echo "Backing up the minecraft server executable"
if [ -f "$BACKUPPATH/minecraft_server_`date "+%Y.%m.%d"`.jar" ]
then
for i in 1 2 3 4 5 6
do
if [ -f "$BACKUPPATH/minecraft_server_`date "+%Y.%m.%d"`-$i.jar" ]
then
continue
else
as_user "cd $MCPATH && cp minecraft_server.jar \"$BACKUPPATH/minecraft_server_`date "+%Y.%m.%d"`-$i.jar\""
break
fi
done
else
as_user "cd $MCPATH && cp minecraft_server.jar \"$BACKUPPATH/minecraft_server_`date "+%Y.%m.%d"`.jar\""
fi
echo "Backup complete"
}


#Start-Stop here
case "$1" in
start)
mc_start
;;
stop)
mc_stop
;;
restart)
mc_stop
mc_start
;;
update)
mc_stop
mc_backup
mc_update
mc_start
;;
backup)
mc_saveoff
mc_backup
mc_saveon
;;
status)
if ps ax | grep -v grep | grep -v -i SCREEN | grep $SERVICE > /dev/null
then
echo "$SERVICE is running."
else
echo "$SERVICE is not running."
fi
;;

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

exit 0