#!/bin/bash
# /etc/init.d/minecraft

### 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: Init script for minecraft/bukkit server, with rolling logs and use of ramdisk for less lag.
### END INIT INFO

# Created by Ahtenus

# Based on http://www.minecraftwiki.net/wiki/Server_startup_script
# Support for multiworld by Benni-chan


#############################
######### SETTINGS ##########
#############################
# Name of server.jar file
SERVICE="craftbukkit.jar"
# Name to use for the screen instance
SCREEN="gara"
# User that should run the server
USERNAME="minecraft"
# Path to minecraft directory
MCPATH="/home/minecraft"
# Number of CPUs/cores to use
CPU_COUNT=1
# Initial memory usage
INITMEM="512M"
# Maximum amount of memory to use
MAXMEM="1536M"
# Remember: give the ramdisk enough space, subtract from the total amount
# of RAM available the size of your map and the RAM-consumption of your base system.
INVOCATION="java -Xmx$MAXMEM -Xms$INITMEM -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalPacing -XX:ParallelGCThreads=$CPU_COUNT -XX:+AggressiveOpts -jar $SERVICE nogui"
# Where the world backups should go
BACKUPPATH="/home/minecraft/minebak"
# Where the logs are copied with log-roll
LOGPATH="${MCPATH}/logs"
# Where the whole minecraft directory is copied when whole-backup is executed
WHOLEBACKUP="/home/minecraft/serverbak"
# Where the worlds are located on the disk. Can not be the same as MCPATH.
WORLDSTORAGE="${MCPATH}/worldstorage"
# Path to the the mounted ramdisk default in Ubuntu: /dev/shm
RAMDISK="/dev/shm"
# use tar or zip files for world backup
BACKUPFORMAT="tar"

ME=`whoami`
as_user() {
if [ $ME == $USERNAME ] ; then
bash -c "$1"
else
su - $USERNAME -c "$1"
fi
}
datepath() {
# datepath path filending-to-check returned-filending
if [ -e $1`date +%F`$2 ]
then
echo $1`date +%FT%T`$3
else
echo $1`date +%F`$3
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 $SCREEN $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 $SCREEN -X eval 'stuff \"save-off\"\015'"
as_user "screen -p 0 -S $SCREEN -X eval 'stuff \"save-all\"\015'"
sync
sleep 10
else
echo "$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 $SCREEN -X eval 'stuff \"save-on\"\015'"
else
echo "$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 $SCREEN -X eval 'stuff \"save-all\"\015'"
sleep 10
as_user "screen -p 0 -S $SCREEN -X eval 'stuff \"stop\"\015'"
sleep 7
else
echo "$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
}
log_roll() {
as_user "mkdir -p $LOGPATH"
path=`datepath $LOGPATH/server_ .log.gz .log`
as_user "mv $MCPATH/server.log $path && gzip $path"
}
get_worlds() {
a=1
for NAME in $(ls $WORLDSTORAGE)
do
if [ -d $WORLDSTORAGE/$NAME ]
then
WORLDNAME[$a]=$NAME
if [ -e $WORLDSTORAGE/$NAME/ramdisk ]
then
WORLDRAM[$a]=true
else
WORLDRAM[$a]=false
fi
a=$a+1
fi
done
}
mc_whole_backup() {
as_user "mkdir -p $WHOLEBACKUP"
path=`datepath $WHOLEBACKUP/mine_`
as_user "cp -rP $MCPATH $path"
}
mc_world_backup() {
get_worlds
for INDEX in ${!WORLDNAME[@]}
do
echo "Backing up minecraft ${WORLDNAME[$INDEX]}"
as_user "mkdir -p $BACKUPPATH"

case "$BACKUPFORMAT" in
tar)
path=`datepath $BACKUPPATH/${WORLDNAME[$INDEX]}_ .tar.bz2 .tar.bz2`
as_user "tar -hcjf $path $MCPATH/${WORLDNAME[$INDEX]}"
;;
zip)
path=`datepath $BACKUPPATH/${WORLDNAME[$INDEX]}_ .zip .zip`
as_user "zip -rq $path $MCPATH/${WORLDNAME[$INDEX]}"
;;
*)
echo "$BACKUPFORMAT is no supported backup format"
;;
esac
done
}
check_links() {
get_worlds
for INDEX in ${!WORLDNAME[@]}
do
if [[ -L $MCPATH/${WORLDNAME[$INDEX]} || ! -a $MCPATH/${WORLDNAME[$INDEX]} ]]
then
link=`ls -l $MCPATH/${WORLDNAME[$INDEX]} | awk '{print $11}'`
if ${WORLDRAM[$INDEX]}
then
if [ "$link" != "$RAMDISK/${WORLDNAME[$INDEX]}" ]
then
as_user "rm -f $MCPATH/${WORLDNAME[$INDEX]}"
as_user "ln -s $RAMDISK/${WORLDNAME[$INDEX]} $MCPATH/${WORLDNAME[$INDEX]}"
echo "created link for ${WORLDNAME[$INDEX]}"
fi
else
if [ "$link" != "${WORLDSTORAGE}/${WORLDNAME[$INDEX]}" ]
then
as_user "rm -f $MCPATH/${WORLDNAME[$INDEX]}"
as_user "ln -s ${WORLDSTORAGE}/${WORLDNAME[$INDEX]} $MCPATH/${WORLDNAME[$INDEX]}"
echo "created link for ${WORLDNAME[$INDEX]}"
fi
fi
else
echo "could not process ${WORLDNAME[$INDEX]}. please move all worlds to ${WORLDSTORAGE}."
exit 1
fi
done
echo "links checked"
}
to_ram() {
get_worlds
for INDEX in ${!WORLDNAME[@]}
do
if ${WORLDRAM[$INDEX]}
then
if [ -L $MCPATH/${WORLDNAME[$INDEX]} ]
then
as_user "rsync -rt --exclude 'ramdisk' ${WORLDSTORAGE}/${WORLDNAME[$INDEX]}/ $RAMDISK/${WORLDNAME[$INDEX]}"
echo "${WORLDNAME[$INDEX]} copied to ram"
fi
fi
done
}
to_disk() {
get_worlds
for INDEX in ${!WORLDNAME[@]}
do
as_user "rsync -rt --exclude 'ramdisk' $MCPATH/${WORLDNAME[$INDEX]}/ ${WORLDSTORAGE}/${WORLDNAME[$INDEX]}"
echo "${WORLDNAME[$INDEX]} copied to disk"
done
}
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

### update craftbukkit

echo "Updating craftbukkit...."
as_user "cd $MCPATH && wget -q -O $MCPATH/craftbukkit.jar.update http://ci.bukkit.org/job/dev-CraftBukkit/promotion/latest/Recommended/artifact/target/craftbukkit-0.0.1-SNAPSHOT.jar"
if [ -f $MCPATH/craftbukkit.jar.update ]
then
if `diff $MCPATH/craftbukkit-0.0.1-SNAPSHOT.jar $MCPATH/craftbukkit.jar.update > /dev/null`
then
echo "You are already running the latest version of CraftBukkit."
as_user "rm $MCPATH/craftbukkit.jar.update"
else
as_user "mv $MCPATH/craftbukkit.jar.update $MCPATH/craftbukkit-0.0.1-SNAPSHOT.jar"
echo "CraftBukkit successfully updated."
fi
else
echo "CraftBukkit update could not be downloaded."
fi
fi
}
change_ramdisk_state() {
if [ ! -e $WORLDSTORAGE/$1 ]
then
echo "World \"$1\" not found."
exit 1
fi
if [ -e $WORLDSTORAGE/$1/ramdisk ]
then
rm $WORLDSTORAGE/$1/ramdisk
echo "removed ramdisk flag from \"$1\""
else
touch $WORLDSTORAGE/$1/ramdisk
echo "added ramdisk flag to \"$1\""
fi
echo "changes will only take effect after server is restarted."
}


case "$1" in
start)
# Starts the server
check_links
to_ram
mc_start
;;
stop)
# Stops the server
as_user "screen -p 0 -S $SCREEN -X eval 'stuff \"say SERVER SHUTTING DOWN!\"\015'"
mc_stop
to_disk
;;
restart)
# Restarts the server
as_user "screen -p 0 -S $SCREEN -X eval 'stuff \"say SERVER REBOOT IN 10 SECONDS.\"\015'"
mc_stop
to_disk
check_links
to_ram
mc_start
;;
backup)
# Backups world
as_user "screen -p 0 -S $SCREEN -X eval 'stuff \"say Backing up world.\"\015'"
mc_saveoff
to_disk
mc_world_backup
mc_saveon
as_user "screen -p 0 -S $SCREEN -X eval 'stuff \"say Backup complete.\"\015'"
;;
whole-backup)
# Backup everything
mc_whole_backup
;;
update)
#update minecraft_server.jar and craftbukkit.jar (thanks karrth)
as_user "screen -p 0 -S $SCREEN -X eval 'stuff \"say SERVER UPDATE IN 10 SECONDS.\"\015'"
mc_stop
to_disk
mc_whole_backup
mc_update
check_links
mc_start
;;
to-disk)
# Writes from the ramdisk to disk, in case the server crashes.
# Using ramdisk speeds things up a lot, especially if you allow
# teleportation on the server.
mc_saveoff
to_disk
mc_saveon
;;
connected)
# Lists connected users
as_user "screen -p 0 -S $SCREEN -X eval 'stuff list\015'"
sleep 3s
tac $MCPATH/server.log | grep -m 1 "Connected"
;;
log-roll)
# Moves and Gzips the logfile, a big log file slows down the
# server A LOT (what was notch thinking?)
as_user "screen -p 0 -S $SCREEN -X eval 'stuff \"say ROUTINE REBOOT IN 10 SECONDS.\"\015'"
mc_stop
log_roll
mc_start
;;
last)
# greps for recently logged in users
echo Recently logged in users:
cat $MCPATH/server.log | awk '/entity|conn/ {sub(/lost/,"disconnected");print $1,$2,$4,$5}'
;;
status)
# Shows server 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
;;
version)
echo Craftbukkit version `awk '/Craftbukkit/ {sub(/\)/, ""); print $12}' $MCPATH/server.log`
;;
links)
check_links
;;
ramdisk)
change_ramdisk_state $2
;;
worlds)
get_worlds
for INDEX in ${!WORLDNAME[@]}
do
if ${WORLDRAM[$INDEX]}
then
echo "${WORLDNAME[$INDEX]} (ramdisk)"
else
echo ${WORLDNAME[$INDEX]}
fi
done
;;
help)
echo "Usage: /etc/init.d/minecraft command"
echo
echo "start - Starts the server"
echo "stop - stops the server"
echo "restart - restarts the server"
echo "backup - backups the worlds defined in the script"
echo "whole-backup - backups the entire server folder"
echo "update - fetches the latest version of minecraft.jar server and Bukkit"
echo "log-roll - Moves and gzips the logfile"
echo "to-disk - copies the worlds from the ramdisk to worldstorage"
echo "connected - lists connected users"
echo "status - Shows server status"
echo "version - returs Bukkit version"
echo "links - creates nessesary symlinks"
echo "last - shows recently connected users"
echo "worlds - shows a list of available worlds"
echo "ramdisk WORLD - toggles ramdisk configuration for WORLD"
;;
*)
echo "No such command see /etc/init.d/minecraft help"
exit 1
;;
esac

exit 0