From fb7ea1517da73501a6da96f1e4504a6bed6f55b1 Mon Sep 17 00:00:00 2001
From: Jonas Gunz <himself@jonasgunz.de>
Date: Sun, 5 Jan 2020 01:18:24 +0100
Subject: added unit file

---
 Readme.md         |  8 ++++++++
 minecraft.service | 16 ++++++++++++++++
 server.sh         | 55 +++++++++++++++++++++++++++++++++++++++++++++++--------
 3 files changed, 71 insertions(+), 8 deletions(-)
 create mode 100644 minecraft.service

diff --git a/Readme.md b/Readme.md
index 29a3792..6ab827e 100644
--- a/Readme.md
+++ b/Readme.md
@@ -41,6 +41,14 @@ The following example copies the created archive to a remote server.
 
     BACKUP_HOOK="scp $ARCHNAME user@server:/home/user/backups/"
 
+## Start automatically
+
+Create user and group `minecraft` with home in `/var/minecraft`.
+Populate the directory with server.sh and a server jar.
+Place `minecraft.service` in `/etc/systemd/system/`
+and run `systemctl start minecraft` to start once or
+`systemctl enable minecraft` to enable autostarting.
+
 ## Disclaimer
 
 The scripts are provided as-is at no warranty.
diff --git a/minecraft.service b/minecraft.service
new file mode 100644
index 0000000..f261625
--- /dev/null
+++ b/minecraft.service
@@ -0,0 +1,16 @@
+# minecraft.service
+
+[Unit] 
+Description=Minecraft Server
+
+[Service]
+Type=forking
+User=minecraft
+Group=minecraft
+PIDFile=/var/minecraft/server-screen.pid
+ExecStart=/var/minecraft/server.sh start
+TimeoutStopSec= 180
+ExecStop=/var/minecraft/server.sh stop
+
+[Install]
+WantedBy=multi-user.target
diff --git a/server.sh b/server.sh
index 5c4129c..9b8156b 100755
--- a/server.sh
+++ b/server.sh
@@ -7,8 +7,8 @@ JAR="server.jar"
 JAR_ARGS="-nogui"
 SCREEN_WINDOW="minecraftserverscreen"
 WORLD_NAME="world"
-LOGFILE="mcserver.log"
-
+LOGFILE="server-screen.log"
+PIDFILE="server-screen.pid"
 #HOOKS
 BACKUP_HOOK='backup_hook_example'
 
@@ -20,14 +20,36 @@ function send_cmd () {
 	screen -S $SCREEN_WINDOW -p 0 -X stuff "$1^M"
 }
 
-function server_start() {
-	screen -list $SCREEN_WINDOW > /dev/null
+function assert_running() {
+	if [ ! -e $PIDFILE ]; then
+		return
+	fi
+
+	ps -p $(cat $PIDFILE) > /dev/null
 	if [ $? -eq 0 ]
 	then
 		echo "It seems a server is already running. If this is not the case,\
 			manually attach to the running screen and close it."
 		exit 1
 	fi
+}
+
+function assert_not_running() {
+	if [ ! -e $PIDFILE ]; then
+		echo "Server not running"
+		exit 1
+	fi
+
+	ps -p $(cat $PIDFILE) > /dev/null
+	if [ ! $? -eq 0 ]
+	then
+		echo "Server not running"
+		exit 1
+	fi
+}
+
+function server_start() {
+	assert_running
 
 	if [ ! -e "eula.txt" ]
 	then
@@ -36,27 +58,44 @@ function server_start() {
 	fi
 
 	rm -f $LOGFILE
-	screen -L -Logfile "$LOGFILE" -S $SCREEN_WINDOW -p 0 -d -m \
-		$JRE_JAVA $JVM_ARGS -jar $JAR $JAR_ARGS
+	screen -L -Logfile "$LOGFILE" -S $SCREEN_WINDOW -p 0 -D -m \
+		$JRE_JAVA $JVM_ARGS -jar $JAR $JAR_ARGS > /dev/null &
+	echo $! > $PIDFILE
+	echo Started with PID $!
 	exit
 }
 
 function server_stop() {
+	assert_not_running
 	send_cmd "stop"
+
+	local RET=1
+	while [ ! $RET -eq 0 ]
+	do
+		sleep 1
+		ps -p $(cat $PIDFILE) > /dev/null
+		RET=$?
+	done
+
+	echo "stopped the server"
+
+	rm -f $PIDFILE
+
 	exit
 }
 
 function server_attach() {
+	assert_not_running
 	screen -r -p 0 $SCREEN_WINDOW
 	exit
 }
 
 function server_status() {
-	screen -list $SCREEN_WINDOW > /dev/null
+	ps -p $(cat $PIDFILE) > /dev/null
 
 	if [ $? -eq 0 ]
 	then
-		echo "Server seems to be running. attach to be sure"
+		echo "Server is running"
 	else
 		echo "Server is not running"
 	fi
-- 
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