main script

#!/bin/bash
# /etc/init.d/minecraft
# version 0.3.7 2012-03-06 (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
SCREEN_NAME="server"
RESTARTER="Путь к restarter"
SERVICE='minecraftforge.jar'
OPTIONS='nogui'
USERNAME='root'
WORLD='world'
MCPATH='/home/server'
BACKUPPATH='/home/server/backup'
CPU_COUNT=1
INVOCATION="java -Xmx512M -Xms512M  -XX:MaxPermSize=256m -XX:PermSize=256m -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalPacing -XX:ParallelGCThreads=$CPU_COUNT -XX:+AggressiveOpts -jar $SERVICE $OPTIONS"
ME=`whoami`
SCRIPT=`readlink -nf $0`

check_service() {
  screen -list | grep -q "$SCREEN_NAME"
  return $?
}

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

mc_start() {
  if check_service; then
    screen -x $SCREEN_NAME
  else
    echo "Starting $SERVICE..."
    as_user "cd $MCPATH && screen -dmS $SCREEN_NAME bash -c \"$INVOCATION 2>&1 | tee /dev/tty | $RESTARTER $SCRIPT\""
    sleep 7
    if check_service; then
      echo "$SERVICE is now running."
    else
      echo "Error! Could not start $SERVICE!"
    fi
  fi
}

mc_saveoff() {
  if check_service; then
    echo "$SERVICE is running... suspending saves"
    mc_command "say СОХРАНЕНИЕ СЕРВЕРА ЗАПУЩЕНО..."
    mc_command "save-off"
    mc_command "save-all"
    sync
    sleep 10
  else
    echo "$SERVICE is not running. Not suspending saves."
  fi
}

mc_saveon() {
  if check_service; then
    echo "$SERVICE is running... re-enabling saves"
    mc_command "save-on"
    mc_command "say СОХРАНЕНИЕ СЕРВЕРА ЗАВЕРШЕНО..."
  else
    echo "$SERVICE is not running. Not resuming saves."
  fi
}

mc_stop() {
  if check_service; then
    echo "Stopping $SERVICE"
    mc_command "say СЕРВЕР БУДЕТ ВЫКЛЮЧЕН ЧЕРЕЗ 10 СЕКУНД И СОХРАНЕНА КАРТА"
    mc_command "save-all"
    sleep 10
    mc_command "stop"
    sleep 7
  else
    echo "$SERVICE was not running."
  fi
  if check_service; then
    echo "Error! $SERVICE could not be stopped."
  else
    echo "$SERVICE is stopped."
  fi
}

mc_backup() {
   sleep 10
   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\" $WORLD"
   mc_saveon
   echo "Compressing backup..."
   as_user "gzip -f \"$BACKUP_FILE\""
   echo "Done."
}

mc_command() {
  command="$1";
  if check_service; then
    pre_log_len=`wc -l "$MCPATH/server.log" | awk '{print $1}'`
    echo "$SERVICE is running... executing command"
    as_user "screen -p 0 -S $SCREEN_NAME -X eval 'stuff \"$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 "$1" in
  start)
    mc_start
    ;;
  stop)
    mc_stop
    ;;
  restart)
    mc_backup
    mc_stop
    mc_start
    ;;
  backup)
    mc_backup
    ;;
  status)
    if check_service; then
      echo "$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
    ;;
  *)
    mc_start
    ;;
esac
exit 0