Add powerbutton service

services/powerbutton.py

@@ -0,0 +1,19 @@
+#!/usr/bin/env python
+"""
+Shutdown script, that waits for a falling edge on a specified GPIO pin
+"""
+import os
+
+try:
+    from RPi import GPIO
+except RuntimeError:
+    print("Error importing RPi.GPIO, need sudo?")
+POWER_BUTTON_PIN = 27
+GPIO.setmode(GPIO.BCM)
+GPIO.setup(POWER_BUTTON_PIN, GPIO.IN, pull_up_down=GPIO.PUD_UP)
+
+print('Monitoring shutdown button for falling edge')
+while True:
+    GPIO.wait_for_edge(POWER_BUTTON_PIN, GPIO.FALLING)
+    print('Shutdown button pressed, shutting down, farewell')
+    os.system('systemctl poweroff')

services/powerbutton.service

@@ -0,0 +1,9 @@
+[Unit]
+Description=Monitors powerbutton to send shutdown command
+
+[Service]
+Restart=on-abnormal
+ExecStart=/usr/local/bin/powerbutton.py
+
+[Install]
+WantedBy=multi-user.target