Pi Desktop manager

pi-desktop-manager

#!/usr/bin/env python

import RPi.GPIO as GPIO
import time
import os, sys
import signal

GPIO.setwarnings(False)
GPIO.setmode(GPIO.BOARD)
GPIO.setup(31, GPIO.OUT)
GPIO.setup(33, GPIO.IN)

GPIO.output(31, GPIO.LOW)
 
def shutdown_system(channels):
    os.system("sync")
    time.sleep(1)
    os.system("shutdown -h now")
    sys.exit()


GPIO.add_event_detect(33, GPIO.RISING, callback=shutdown_system)

while True:
    time.sleep(1)

pi-desktop.service

[Unit]
Description=Pi-Desktop power on/off manager
After=local-fs.target

[Service]
Type=simple
ExecStart=/usr/local/bin/pi-desktop-manager

[Install]
WantedBy=multi-user.target