minecraft-magic.sh

#!/bin/bash
# This script should handle the automatic backup and map generation
# of a Minecraft server.
#
# Steps of the process:
# - Stop the Minecraft server if it runs
# - Copy the whole Minecraft directory to /tmp
# - Start the Minecraft server with the specified parameters
# - Compress and transfer the data to a backuphost
# - Start map generation and transfer the pictures to a webhost
# - Delete the created folders in /tmp
# - Delete backups that are older than 7 days but keep backups from monday, the same for servermaps
# -------------------------------------------------------------------------------------------------
# Path to Minecraft directory
MCPATH=/home/killa/minecraft_new

# Name of minecraft.jar
MCJARNAME=Minecraft_Mod.jar

# Name of the Minecraft world
MCWORLDNAME=world

# Parameters for minecraft
MCPARAMS="-Xms1024M -Xmx2048M nogui"
         
# Path to temporary folder
TMPFOLDER=/tmp

# Timestamp for filenames etc.
TIMESTAMP=$(date +%y-%m-%d.%H-%M-%S)

# Name of the screen session
SCREENNAME=mc

# Directory which contains the map generation tools
MAPDIR=/home/killa/c10t-1.5

# Parameters for the map generation tools
MAPPARAMS="-M1536"
          
# Hostname of the webserver which hosts the maps
MAPHOST=vlin2.nc23.de

# Username for login into the webserver
MAPHOSTUSER=killa

# Full path to the ssh key-to-use
MAPHOSTKEY=/home/killa/.ssh/id_rsa

# Full path to the directory which will be used for maps
MAPHOSTPATH=/var/www/vhosts/killa/public/minecraft/map

# Hostname of the backupserver
BACKUPHOST=googlerocks.dyndns.org

# Username for login into the backupserver
BACKUPHOSTUSER=mcbck-killa

# Full path to the ssh key-to-use for the backupserver
BACKUPHOSTKEY=/home/killa/.ssh/id_rsa

# Backup directory
BACKUPDIR=

# Time to wait before the Minecraft server goes down
STOPDELAY=30

# Message to display ingame before the Minecraft server goes down
STOPMSG="The server will be restarted in $STOPDELAY seconds for daily backup and map generation"

# -----------------------------------------------------------------------
ACTDATADIR=$TMPFOLDER/mcbackup_$TIMESTAMP
        
function serverIsRunning() {
    return $(ps ux | grep "java -jar $MCJARNAME $MCPARAMS" | grep -v grep | wc -l)
}

function screenExists() {
    return $(ps ux | grep -e ".*SCREEN.*$SCREENNAME.*" | grep -v grep | wc -l)
}

function startServer() {
    serverIsRunning()
    serverState=$?
    screenExists()
    screenState=$?
    if [ serverState -eq 1 ]; then
        echo "Didn't start the server because it was already running"
        exit 0
    fi
    if [ screenState -eq 0 ]; t# - Start the Minecraft server with the specified parametershen
        screen -dmS $SCREENNAME
        sleep 3
    fi
    screen -S $SCREENNAME -X stuff "`printf "cd $MCPATH && java -jar $MCJARNAME $MCPARAMS\r"`"
}

function stopServer() {
    serverIsRunning()
    serverState=$?
    screenExists()
    screenState=$?
    if [ $serverState -eq 0 ]; then
        echo "Couldn't stop the server, because no running instance was found"
        return
    fi
    if [ $screenState -eq 0 ]; then
        echo "Couldn't stop the server, because no screen with the name $SCREENNAME was found"
        return
    elif [ $screenState -gt 1 ]; then
        echo "Couldn't stop the server, because there are $screenState screens with the name $SCREENNAME"
        exit 1
    fi
    
    screen -S $SCREENNAME -X stuff "`printf "say $STOPMSG\r"`"
    sleep $STOPDELAY
    screen -S $SCREENNAME -X stuff "`printf "save-all\rstop\r"`"
    retVal=1
    tries=0
    until [ $retVal -a $tries -le 15 ]; do
        serverIsRunning()
        retVal=$?
        let "tries++"
        sleep 1
    done
    
    if [ $tries -gt 15 ]; then
        echo "The server didnt shutdown after 15 seconds"
        exit 1
    done
}

function transferToBackupServer() {
    tar -cvjf - $ACTDATADIR | ssh -i $BACKUPHOSTKEY $BACKUPHOSTUSER@$BACKUPHOST "cat - > $BACKUPDIR/mcbackup_$TIMESTAMP.tar.bz"
}

function mapGenerationAndTransfer() {
    cd $MAPDIR
    ./google-api.sh $ACTDATADIR/$MCWORLDNAME $ACTDATADIR.MAPGEN $MAPPARAMS
    tar -cvf - $ACTDATADIR.MAPGEN | ssh -i $MAPHOSTKEY $MAPHOSTUSER@$MAPHOST "tar -C $MAPHOSTPATH -xvf -"
}

stopServer()
cp -rf $MCPATH $ACTDATADIR
startServer()
transferToBackupServer() &
mapGenerationAndTransfer() &
wait
rm -rf $ACTDATADIR $ACTDATADIR.MAPGEN