FTB Bash Script Server Wrapper

#!/bin/bash
# /etc/init.d/minecraft <-- you could put it there or in cron, I use it in cron.
# version 0.5.0 2014-03-19 (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='FTBServer.jar'
OPTIONS='nogui'
USERNAME='root'
WORLD='world'
MCPATH='/path/to/server'
BACKUPPATH="${MCPATH}.backup"
SESSIONNAME='monster'
SESSION=$SESSIONNAME
ACTION='SHUTTING DOWN'
MAXHEAP=4096
MINHEAP=2048
PERMSIZE=128
HISTORY=128
CPU_COUNT=2
INVOCATION="java -Xmx${MAXHEAP}M -Xms${MINHEAP}M -XX:PermSize=${PERMSIZE}M  -XX:MaxPermSize=128M -XX:+UseConcMarkSweepGC \
-XX:+CMSIncrementalPacing -XX:ParallelGCThreads=$CPU_COUNT -XX:+AggressiveOpts \
-jar ${MCPATH}/${SERVICE} $OPTIONS"

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

mc_start() {
  # A good place as any to remove dead screens
  screen -wipe
  as_user "screen -p 0 -S $SESSIONNAME -X eval 'stuff \"save-on\"\015'"

  if  pgrep -u $USERNAME -f $SERVICE > /dev/null
  then
    echo "$SERVICE is already running!"
  else
    echo "Starting $SERVICE..."
    cd $MCPATH
    as_user "cd $MCPATH && screen -h $HISTORY -dmS $SESSIONNAME $INVOCATION"
    sleep 7
    if pgrep -u $USERNAME -f $SERVICE > /dev/null
    then
      echo "$SERVICE is now running."
    else
      echo "Error! Could not start $SERVICE!"
    fi
  fi
}

mc_saveoff() {
  if pgrep -u $USERNAME -f $SERVICE > /dev/null
  then
    echo "$SERVICE is running... suspending saves"
    as_user "screen -p 0 -S $SESSIONNAME -X eval 'stuff \"say SERVER BACKUP STARTING. Server going readonly...\"\015'"
    as_user "screen -p 0 -S $SESSIONNAME -X eval 'stuff \"save-off\"\015'"
    as_user "screen -p 0 -S $SESSIONNAME -X eval 'stuff \"save-all\"\015'"
    sync
    sleep 10
  else
    echo "$SERVICE is not running. Not suspending saves."
  fi
}

mc_saveon() {
  if pgrep -u $USERNAME -f $SERVICE > /dev/null
  then
    echo "$SERVICE is running... re-enabling saves"
    as_user "screen -p 0 -S $SESSIONNAME -X eval 'stuff \"save-on\"\015'"
    as_user "screen -p 0 -S $SESSIONNAME -X eval 'stuff \"say SERVER BACKUP ENDED. Server going read-write...\"\015'"
  else
    echo "$SERVICE is not running. Not resuming saves."
  fi
}

mc_stop() {
  if pgrep -u $USERNAME -f $SERVICE > /dev/null
  then
    echo "Stopping $SERVICE"
    as_user "screen -p 0 -S $SESSIONNAME -X eval 'stuff \"say SERVER $ACTION IN 5 MINUTES. Saving map...\"\015'"
    echo "Announced to server a 5 minute shutdown time"
    sleep 60
    as_user "screen -p 0 -S $SESSIONNAME -X eval 'stuff \"say SERVER $ACTION IN 4 MINUTES.\"\015'"
    sleep 60
    as_user "screen -p 0 -S $SESSIONNAME -X eval 'stuff \"say SERVER $ACTION IN 3 MINUTES.\"\015'"
    sleep 60
    as_user "screen -p 0 -S $SESSIONNAME -X eval 'stuff \"say SERVER $ACTION IN 2 MINUTES.\"\015'"
    as_user "screen -p 0 -S $SESSIONNAME -X eval 'stuff \"save-all\"\015'"
    echo "Issued save-all command via console"
    sleep 60
    as_user "screen -p 0 -S $SESSIONNAME -X eval 'stuff \"say SERVER $ACTION IN 1 MINUTE.\"\015'"
    sleep 60
    echo "Telling the server to stop!"
    as_user "screen -p 0 -S $SESSIONNAME -X eval 'stuff \"say SERVER $ACTION IN 0 SECONDS.\"\015'"
    as_user "screen -p 0 -S $SESSIONNAME -X eval 'stuff \"stop\"\015'"
    echo "Waiting 2 more minutes! $SESSIONNAME is a pig you know!"
    as_user "screen -p 0 -S $SESSIONNAME -X eval 'stuff \"say SERVER $ACTION IN 0 SECONDS! IT IS YOUR FAULT IF YOU LOSE STUFF!.\"\015'"
    sleep 120
  else
    echo "$SERVICE was not running."
  fi
  if pgrep -u $USERNAME -f $SERVICE > /dev/null
  then
    mc_forcekill
  else
    echo "Success! $SERVICE is stopped!"
  fi
}

mc_forcekill() {
   echo "Error! $SERVICE could not be stopped."
   echo "Forcefully killing SCREEN associated with $SERVICE!"
   kill -9 `ps aux | grep SCREEN | grep $SERVICE | awk '{print $2}'` #kill screen that manages this service
   if pgrep -u $USERNAME -f $SERVICE > /dev/null
   then
      mc_nuke_java
   else
      echo "Success! $SERVICE is stopped!"
   fi
}

mc_nuke_java() {
      echo "There was a serious ass problem! I can't kill $SERVICE at all!"
      echo "Drastic measures enabled, killing java outright!"
      #kill -9 `pgrep java`
      kill -9 `ps aux | grep $SESSION | awk '{print $2}'` #kill screen that manages this service

      if pgrep -u $USERNAME -f $SERVICE > /dev/null
      then
        echo "Congratulations your sytem is pretty much fucked! What are you running?"
      else
        echo "Drastic measures SUCCESSFUL! $SERVICE is stopped!"
      fi
}

mc_update() {
  if pgrep -u $USERNAME -f $SERVICE > /dev/null
  then
    echo "$SERVICE is running! Will not start update."
  else
    MC_SERVER_URL=http://s3.amazonaws.com/MinecraftDownload/launcher/minecraft_server.jar?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 $MCPATH/$SERVICE $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 $MCPATH/$SERVICE"
        echo "Minecraft successfully updated."
      fi
    else
      echo "Minecraft update could not be downloaded."
    fi
  fi
}

mc_backup() {
   mc_saveoff

   NOW=`date "+%Y-%m-%d_%Hh%M"`
   BACKUP_FILE="$BACKUPPATH/${WORLD}_${NOW}.tar"
   echo "Backing up minecraft world..."
   #as_user "cd $MCPATH && cp -r $WORLD $BACKUPPATH/${WORLD}_`date "+%Y.%m.%d_%H.%M"`"
   as_user "tar -C \"$MCPATH\" -cf \"$BACKUP_FILE\" $WORLD"

   echo "Backing up $SERVICE"
   as_user "tar -C \"$MCPATH\" -rf \"$BACKUP_FILE\" $SERVICE"
   #as_user "cp \"$MCPATH/$SERVICE\" \"$BACKUPPATH/minecraft_server_${NOW}.jar\""

   mc_saveon

   echo "Compressing backup..."
   as_user "gzip -f \"$BACKUP_FILE\""
   echo "Done."
}

mc_command() {
  command="$1";
  if pgrep -u $USERNAME -f $SERVICE > /dev/null
  then
    pre_log_len=`wc -l "$MCPATH/server.log" | awk '{print $1}'`
    echo "$SERVICE is running... executing command"
    as_user "screen -p 0 -S $SESSIONNAME -X eval 'stuff \"$command\"\015'"
    sleep .1 # assumes that the command will run and print to the log file in less than .1 seconds
    # print output
    tail -n $[`wc -l "$MCPATH/server.log" | awk '{print $1}'`-$pre_log_len] "$MCPATH/server.log"
  fi
}

#Start-Stop here
case "$1" in
  start)
    mc_start
    ;;
  stop)
    mc_stop
    ;;
  kill)
    mc_forcekill
    ;;
  nuke)
    mc_nuke_java
    ;;
  restart)
    ACTION='REBOOTING'
    mc_stop
    mc_start
    ;;
  update)
    mc_stop
    mc_backup
    mc_update
    mc_start
    ;;
  backup)
    mc_backup
    ;;
  status)
    if pgrep -u $USERNAME -f $SERVICE > /dev/null
    then
      echo "$SERVICE is running."
    else
      echo "$SERVICE is not running."
    fi
    ;;
  command)
    if [ $# -gt 1 ]; then
      shift
      mc_command "$*"
    else
      echo "Must specify server command (try 'help'?)"
    fi
    ;;

  *)
  echo "Usage: $0 {start|stop|kill|nuke|update|backup|status|restart|command \"server command\"}"
  exit 1
  ;;
esac

exit 0