btctl

#!/bin/bash

LABEL='bt'
USERNAME='battletech'
GAMEPATH='/srv/bttt'
SERVICE='bttt'
PARAMS='-dedicated'
FIRST_CMD=''

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

bt_start()
{
  if pgrep -u $USERNAME -f $SERVICE > /dev/null
  then
    echo "$SERVICE is already running!"
  else
    as_user "screen -wipe >/dev/null"
    echo "Starting $SERVICE..."
    as_user "cd $GAMEPATH && screen -S $LABEL -dm /bin/sh -c 'stdbuf -oL -eL ./$SERVICE $PARAMS >>server.log 2>>server.log'"
    sleep 0.5
    if pgrep -u $USERNAME -f $SERVICE > /dev/null
    then
      echo "$SERVICE is now running."
      
      if [ ! -z "$FIRST_CMD" ]
      then
        bt_command "$FIRST_CMD"
      fi
      
    else
      echo "Error! Could not start $SERVICE!"
    fi
  fi
}

bt_stop()
{
  if pgrep -u $USERNAME -f $SERVICE > /dev/null
  then
    echo "Stopping $SERVICE..."
    as_user "screen -p 0 -S $LABEL -X eval 'stuff \"quit\"\015'"
    sleep 0.5
  else
    echo "$SERVICE was not running."
  fi
  if pgrep -u $USERNAME -f $SERVICE > /dev/null
  then
    killall -KILL $SERVICE
    echo "$SERVICE killed."
  else
    echo "$SERVICE is stopped."
  fi
}

bt_command()
{
  command="$1";
  if pgrep -u $USERNAME -f $SERVICE > /dev/null
  then
    pre_log_len=`wc -l "$GAMEPATH/server.log" | awk '{print $1}'`
    echo "$SERVICE executing command: $command"
    as_user "screen -p 0 -S $LABEL -X eval 'stuff \"${command//;/\\015}\"\015'"
    sleep 0.1 # assumes that the command will run and print to the log file in less than .1 seconds
    # print output
    tail -n $[`wc -l "$GAMEPATH/server.log" | awk '{print $1}'`-$pre_log_len] "$GAMEPATH/server.log"
  fi
}

#Start-Stop here
case "$1" in
  start)
    bt_start
    ;;
  stop)
    bt_stop
    ;;
  restart)
    bt_stop
    bt_start
    ;;
  status)
    if pgrep -u $USERNAME -f $SERVICE > /dev/null
    then
      echo "$SERVICE is running."
    else
      echo "$SERVICE is not running."
    fi
    ;;
  command)
    if [ $# -gt 1 ]
    then
      shift
      bt_command "$*"
    else
      echo "Must specify server command."
    fi
    ;;

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

exit 0