init.d/minecraft

#!/bin/sh
### 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: 3 5
# Default-Stop: 0 1 6
# Short-Description: Minecraft server
# Description: Init script for minecraft server
### END INIT INFO

# Copyright 2015-2018 Rivoreo

# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:

# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.

# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE
# FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
# CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

[ -f /etc/default/minecraft ] && . /etc/default/minecraft

set -e

[ -z "$MINECRAFT_USER_NAME" ] && MINECRAFT_USER_NAME=minecraft
[ -z "$MINECRAFT_HOME" ] && MINECRAFT_HOME="`getent passwd $MINECRAFT_USER_NAME | cut -d : -f 6`"
[ -z "$MINECRAFT_START_COMMAND" ] && MINECRAFT_START_COMMAND="exec sh start.sh"

if [ -z "$MINECRAFT_SERVERS" ]; then
	echo "No server defined, exiting" 1>&2
	exit 255
fi

[ `id -u` = 0 ] && exec sudo -u "$MINECRAFT_USER_NAME" "$0" "$@"

case "$MINECRAFT_USE_TMUX" in
	[Oo][Nn]|[Yy][Ee][Ss]|Y|[Tt][Rr][Uu][Ee]|1)
		MINECRAFT_USE_TMUX=1
		[ -z "$MINECRAFT_SESSION_NAME" ] && MINECRAFT_SESSION_NAME=minecraft
		;;
	[Oo][Ff][Ff]|[Nn][Oo]|N|[Ff][Aa][Ll][Ss][Ee]|0|"")
		MINECRAFT_USE_TMUX=0
		[ -z "$MINECRAFT_ALTERNATIVE_LOG_FILE" ] && MINECRAFT_ALTERNATIVE_LOG_FILE=/dev/null
		;;
	*)
		echo "Unrecognized value of MINECRAFT_USE_TMUX" 1>&2
		exit 1
esac

check_user() {
	[ "`whoami`" = "$MINECRAFT_USER_NAME" ] && return 0
	echo "Permission denied" 1>&2
	exit 1
}

PID=

is_running() {
	if [ $# != 1 ]; then
		printf "Internal error: is_running: # (%s) != 1\\n" $# 1>&2
		exit 2
	fi
	pid_file="$MINECRAFT_HOME/$1/server.pid"
	#[ -f "$pid_file" ] && PID="`cat \"$pid_file\"`" && [ -n "$PID" ] && [ "$PID" != 0 ] && [ "`ps -o comm= -p $PID`" = java ]
	[ -f "$pid_file" ] && PID="`cat \"$pid_file\"`" && [ -n "$PID" ] && [ "$PID" != 0 ] && ps -o comm= -p $PID | grep -Fq java && return 0
	rm -f "$pid_file"
	return 1
}

minecraft_start() {
	check_user
	r=0
	for i in $MINECRAFT_SERVERS; do
		if is_running "$i"; then
			printf "Server %s is already running\\n" "$i"
			continue
		fi
		#echo Starting Minecraft server...
		cd "$MINECRAFT_HOME/$i" || continue
		if [ "$MINECRAFT_USE_TMUX" = 1 ]; then
			tmux -L "$MINECRAFT_SESSION_NAME-$i" new-session -d "$MINECRAFT_START_COMMAND"
		else
			sh -c "$MINECRAFT_START_COMMAND" < /dev/null >> "$MINECRAFT_ALTERNATIVE_LOG_FILE" 2>&1 & sh_pid=$!
		fi
		sleep 1
		if is_running "$i"; then
			if [ "$MINECRAFT_USE_TMUX" = 1 ] || [ $PID = $sh_pid ]; then
				printf "Minecraft server %s started\\n" "$i"
			else
				printf "Minecraft server %s appeared to be started, but PID mismatch (%s!=%s)\\n" "$i" $PID $sh_pid
			fi
		else
			printf "Failed to start Minecraft server %s\\n" "$i"
			r=$((r+1))
		fi
	done
	return $r
}

minecraft_stop() {
	check_user
	for i in $MINECRAFT_SERVERS; do
		if ! is_running "$i"; then
			printf "Server %s is not running\\n" "$i" 1>&2
			continue
		fi
		if [ "$MINECRAFT_USE_TMUX" = 1 ]; then
			tmux -L "$MINECRAFT_SESSION_NAME-$i" send-keys -t 0 C-u stop ENTER
			#sleep 4
			j=8
			while [ $j -gt 0 ]; do
				j=$((j-1))
				sleep 0.5
				printf .
				if ! is_running "$i"; then
					printf " %s stopped\\n" "$i" 1>&2
					continue 2
				fi
			done
			echo
		fi
		echo "Sending SIGINT..." 1>&2
		kill -s INT "$PID"
		#sleep 2
		j=4
		if while [ $j -gt 0 ]; do
			j=$((j-1))
			sleep 0.5
			if ! is_running "$i"; then
				j=0
				false
			fi
		done; then
			echo "Sending SIGTERM..." 1>&2
			kill "$PID"
			j=8
			if while [ $j -gt 0 ]; do
				j=$((j-1))
				sleep 0.5
				if ! is_running "$i"; then
					j=0
					false
				fi
			done; then
				echo "Sending SIGKILL..." 1>&2
				kill -s KILL $PID
			fi
		fi
		printf "%s stopped\\n" "$i" 1>&2
	done
}

case "$1" in
	start)
		minecraft_start
		;;
	stop)
		minecraft_stop
		;;
	restart)
		minecraft_stop
		sleep 0.5
		minecraft_start
		;;
	status)
		r=0
		for i in $MINECRAFT_SERVERS; do
			if is_running "$i"; then
				printf "%s is running (pid %s)\\n" "$i" "$PID"
			else
				printf "%s is not running\\n" "$i"
				r=$((r+1))
			fi
		done
		exit $r
		;;
	*)
		echo "Usage: $0 {start|stop|restart|status}"
		exit 255
		;;
esac