Add script to run a Minecraft server in the background

Author: mvforell

Minecraft_server_in_background/README.md

@@ -0,0 +1,22 @@
+# Running a Minecraft server in the background
+
+This program runs a script (which can be specified) in a subprocess with redirected output
+(new output location can be specified) and periodically checks a file for a keyword (both
+the name of the file to check and the keyword to check for can be specified)
+and exits (stopping the subprocess via sending a command), if the contents of the file
+include the keyword.
+
+You probably want to run this script in background, e.g. calling it via './run.py &'
+or via 'nohup ./run.py &'.
+
+A sample invocation could look like this:
+
+```bash
+nohup ./run.py &
+```
+Now the specified script, e.g. a Minecraft server, is running in the background.
+
+```bash
+echo stop > command.txt
+```
+After a short delay, the script in the background will be stopped.

Minecraft_server_in_background/run.py

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+#!/usr/bin/env python3
+
+import subprocess
+import time
+
+filename_script = './start.sh'  # the script that will be executed
+filename_script_output = './log.txt'
+filename_own_input = 'command.txt'  # the file this script periodically reads from
+stop_command = b'stop\n'  # must be a binary string
+exit_keyword = 'stop'
+
+with open(filename_own_input, 'w') as f:
+	f.write('')  # reset content of file and create it if needed
+
+fd_script_output = open(filename_script_output, 'w')  # create file descriptor for script to write its stdout to
+script_process = subprocess.Popen(  # start new process running script
+	filename_script,
+	stdin=subprocess.PIPE,  # needed for script_process.communicate() (see below)
+	stdout=fd_script_output  # redirect output
+)
+
+while True:
+	with open(filename_own_input, 'r') as f:
+		if exit_keyword in f.read():  # check if we should exit
+			script_process.communicate(input=stop_command)  # stop subprocess and wait for it to terminate
+			break
+	time.sleep(1)
+
+fd_script_output.close()

Minecraft_server_in_background/start.sh

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+#!/bin/sh
+
+java -Xmx2048M -Xms2048M -jar server.jar -nogui

README.md

@@ -34,6 +34,7 @@ So far, the following projects have been integrated to this repo:
 |[Image circle formatter](https://github.com/hastagAB/Awesome-Python-Scripts/tree/master/Image-Circulator) |[Berk Gureken](https://github.com/bureken) | 
 |[Image To PDF](https://github.com/hastagAB/Awesome-Python-Scripts/tree/master/images2pdf)|[msaoudallah](https://github.com/msaoudallah)|
 |[Instadp Web Scrapper](https://github.com/hastagAB/Awesome-Python-Scripts/tree/master/InstadpShower)|[Psychiquest](https://github.com/psychiquest)|
+|[Minecraft Server in background](https://github.com/hastagAB/Awesome-Python-Scripts/tree/master/Minecraft_server_in_background)|[Max von Forell](https://github.com/mvforell)|
 |[Own IP locator](https://github.com/hastagAB/Awesome-Python-Scripts/tree/master/Location_Of_Own_IP_Adress)|[Chris]()|
 |[Port Scanner](https://github.com/hastagAB/Awesome-Python-Scripts/tree/master/Port_Scanner)|[Plutoberth](https://github.com/Plutoberth)|
 |[Python Algebra Solver](https://github.com/hastagAB/Awesome-Python-Scripts/tree/master/Algebra-Solver)|[Sengxay Xayachack](https://github.com/frankxayachack)|