My minecraft

README.md

Needs:

• rdiff-backup
• tmux
• zstd
• tar
• awk
• ps
• grep
• cut

And obiously java

mc.sh

#!/bin/bash

# set default settings
MCPATH=$(realpath $(dirname "$BASH_SOURCE[0]"))
SERVICE=$(basename $MCPATH)
BACKUPPATH="$MCPATH/backup"

JAVA_OPTIONS="@user_jvm_args.txt"

PORT=$(grep server-port $MCPATH/server.properties | cut -d '=' -f 2)

JAVA=$(which java)
JAR="-Dlog4j2.formatMsgNoLookups=true @libraries/net/minecraftforge/forge/1.19.2-43.2.8/unix_args.txt"
INVOCATION="${JAVA} ${JAVA_OPTIONS} ${JAR} nogui"

# load user settings
if [ -f mc-config.sh ]; then
	source mc-config.sh
fi

if [ -z "$PORT" ]; then
	PORT=25565
fi

# Settings end

is_running() {
	if [ ! -e $MCPATH/java.pid ]; then
		return 1
	fi
	
	pid=$(cat $MCPATH/java.pid)
	if [ -z $pid ]; then
		return 1
	fi
	
	ps -eo "%p" | grep "^\\s*$pid\\s*\$" > /dev/null
	return $?
}

mc_start() {
	if is_running; then
		echo "Tried to start but $SERVICE was already running!"
		return
	fi

	echo -n "$SERVICE starting."

	cd $MCPATH
	tmux new-session -d -s "mc$PORT" -n "mc$PORT" "$INVOCATION"

	for (( i=0; i < 10; i++ )); do
		tmuxpid=$(tmux list-sessions -F "#{session_name} #{pid}" | awk -v port="mc$PORT" '$1 == port {print $2}')
		javapid=$(ps -eo '%P %p' | grep "^\\s*$tmuxpid " | awk -v tpid="$tmuxpid" '$1 == tpid {print $2}')

		if [[ -n "$tmuxpid" && -n "$javapid" ]]; then
			break
		fi

		echo -n .
		sleep 1
	done
	echo

	if [[ -n "$tmuxpid" && -n "$javapid" ]]; then
		echo "$SERVICE is now running."
		echo "$javapid" > $MCPATH/java.pid
	else
		echo "Could not start $SERVICE."
	fi
}

mc_stop() {
	if ! is_running; then
		echo "$SERVICE was not running."
		return
	fi

	echo "$SERVICE saving map..."

	mc_exec "say SERVER SHUTTING DOWN IN 10 SECONDS. Saving map..."
	mc_exec "save-all"
	sleep 10
	echo -n "$SERVICE stopping."
	mc_exec "stop"

	for (( i=0; i < 20; i++ )); do
		is_running || break
		echo -n .
		sleep 1
	done
	echo

	if is_running; then
		echo "$SERVICE could not be shut down cleanly... still running."
		mc_kill
	else
		echo "$SERVICE is shut down."
	fi

	rm $MCPATH/java.pid
}

mc_saveoff() {
	if is_running; then
		echo "$SERVICE is running... suspending saves"
		mc_exec "say SERVER BACKUP STARTING. Server going readonly..."
		mc_exec "save-off"
		mc_exec "save-all"
		sync
		sleep 10
	else
		echo "$SERVICE was not running. Not suspending saves."
	fi
}

mc_saveon() {
	if is_running; then
		echo "$SERVICE is running... re-enabling saves"
		mc_exec "save-on"
		mc_exec "say SERVER BACKUP ENDED. Server going read-write..."
	else
		echo "$SERVICE was not running. Not resuming saves."
	fi
}

mc_kill() {
	pid=$(cat $MCPATH/java.pid)

	echo "terminating process with pid $pid"
	kill $pid
	
	for (( i=0; i < 10; i++ )); do
		is_running || break
		sleep 1
	done

	if is_running; then
		echo "$SERVICE could not be terminated, killing..."
		kill -SIGKILL $pid
		echo "$SERVICE killed"
	else
		echo "$SERVICE terminated"
	fi
}

mc_backup() {
	echo "Backing up minecraft world"

	[ -d "$BACKUPPATH/world" ] || mkdir -p "$BACKUPPATH/world"

	echo "*_old\m**/*_old" | \
		rdiff-backup backup --exclude-globbing-filelist-stdin $MCPATH "$BACKUPPATH/world"
	
	echo "Backup complete"
}

mc_archive() {
	if (($(date +%H) == 0)) && (($(date +%M) < 15)); then
		echo "Compressing world..."

		folder=$BACKUPPATH/world
		archive=$BACKUPPATH/$(date +%Y-%m-%d).tar.zstd
		tar --zstd -cf "$archive"--exclude="rdiff-backup-data" -C "$folder" .

		echo "Deleting old archives"
		find $BACKUPPATH -maxdepth 1 -type f -mtime +7 -delete
	fi
}

mc_exec() {
	if is_running; then
		tmux send-keys -t "mc$PORT" "$@" C-m
	else
		echo "$SERVICE was not running. Not executing command."
	fi
}

case "$1" in
  start)
    mc_start
    ;;
  stop)
    mc_stop
    ;;
  restart)
    mc_stop
    mc_start
    ;;
  backup)
    mc_saveoff
    mc_backup
    mc_saveon
    mc_archive
    ;;
  exec)
    shift
    mc_exec "$@"
    ;;
  status)
    if is_running; then
      echo "$SERVICE is running."
    else
      echo "$SERVICE is not running."
      exit 1
    fi
    ;;

  *)
	  echo "Usage: $(readlink -f $0) {start|stop|restart|backup|exec|status}"
	  exit 1
  	;;
esac

exit 0