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- Minecraft Server
- Tuesday, September 20th, 2011 at 8:23:42am MDT
- #!/bin/bash
- # This script is public domain
- COMM_FILE="/tmp/minecraft.not-a-socket"
- CONFIG_PATH="/home/minecraft/server"
- SERVER_JAR="/home/minecraft/server/minecraft_server.jar"
- MEMORY_MAX="1024M"
- MEMORY_MIN="128M"
- PID_FILE="/tmp/minecraft.pid"
- JAVA="$(which java)"
- function start_server
- {
- server_status > /dev/null && echo "Server already running." && exit 1
- # Prepare the path for server launch
- if mkdir -p "$CONFIG_PATH" && cd "$CONFIG_PATH" && > "$COMM_FILE"
- then
- # Pipe the contents of $COMM_FILE into the server every 250ms
- tail -fs 0.25 "$COMM_FILE" | \
- $JAVA -Xms$MEMORY_MIN -Xmx$MEMORY_MAX -jar "$SERVER_JAR" nogui \
- > /dev/null 2>&1 &
- # Save the PID the disown the tail and java thread
- PID="$!"
- echo "$PID" > "$PID_FILE"
- disown "$PID"
- fi
- server_status
- return "$?"
- }
- function stop_server
- {
- server_status > /dev/null || { echo "Server not running" && exit 1; }
- # Send "stop" to the server console
- communicate stop
- # Kill off any tail commands reading from the communication file
- TAILS="$(ps ao comm,pid,args | \
- awk "/^tail.*$(basename $COMM_FILE)\$/ {print \$2}")"
- kill $TAILS > /dev/null 2>&1
- echo -n "Waiting on server to stop..."
- while server_status > /dev/null
- do
- echo -n "."
- sleep 1
- done
- echo " Done."
- }
- function communicate
- {
- if server_status > /dev/null
- then
- # Save the last line from the server log
- LAST_LINE="$(tail -n1 "$CONFIG_PATH/server.log")"
- # Echo the message to the $COMM_FILE
- echo $* >> "$COMM_FILE"
- # Sleep for a moment, then print all new dat written to the server log
- usleep 250000 > /dev/null 2>&1 || sleep 1
- fgrep -A100000 "$LAST_LINE" "$CONFIG_PATH/server.log" | tail -n +2
- return 0
- fi
- echo "Unable to communicate with server."
- return 1
- }
- function server_status
- {
- PID="$(cat "$PID_FILE" 2> /dev/null)"
- if kill -0 "$PID" > /dev/null 2>&1
- then
- echo "Server PID is $PID."
- return 0
- fi
- echo "Server is not running."
- return 1
- }
- case "$1" in
- start)
- start_server
- ;;
- stop)
- stop_server
- ;;
- restart)
- stop_server
- start_server
- ;;
- status)
- server_status
- ;;
- send)
- shift
- communicate $*
- ;;
- *)
- echo "Usage: $0 {start|stop|restart|status|send MESSAGE}"
- exit 1
- ;;
- esac
- exit
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