Create power button service and installer

README.md

@@ -1,2 +1,5 @@
 # power-button
 
+# Dependencies
+sudo apt install python3-pip
+sudo apt install python3-gpiozero

install

@@ -0,0 +1,31 @@
+#! /usr/bin/env python3
+
+import os
+from string import Template
+from subprocess import check_call
+
+EXEC       = 'power-button.py'
+SERVICE    = 'power-button.service'
+SYSTEM_DIR = '/etc/systemd/system'
+
+CURRENT_DIR      = os.path.dirname(os.path.realpath(__file__))
+EXEC_PATH        = os.path.join(CURRENT_DIR, EXEC)
+SERVICE_TEMPLATE = os.path.join(CURRENT_DIR, SERVICE)
+SERVICE_FILE     = os.path.join(SYSTEM_DIR, SERVICE)
+EXEC_START       = f'python3 {EXEC}'
+
+with open(SERVICE_TEMPLATE) as f:
+    serviceTemplate = Template(f.read())
+
+serviceFile = serviceTemplate.substitute(
+    workingDirectory=CURRENT_DIR,
+    execStart=EXEC_START
+)
+
+with open(SERVICE_FILE, 'w') as f:
+    f.write(serviceFile)
+
+check_call(['systemctl', 'daemon-reload'])
+check_call(['systemctl', 'enable', '--no-pager', SERVICE])
+check_call(['systemctl', 'restart', '--no-pager', SERVICE])
+check_call(['systemctl', 'status', '--no-pager', SERVICE])

power-button.py

@@ -0,0 +1,16 @@
+from gpiozero import Button
+from signal import pause
+from subprocess import check_call
+
+BUTTON_GPIO_PIN = 3
+HOLD_TIME_IN_SECONDS = 2
+
+
+def poweroff():
+    check_call(['sudo', 'poweroff'])
+
+
+button = Button(BUTTON_GPIO_PIN, hold_time=HOLD_TIME_IN_SECONDS)
+button.when_held = poweroff
+
+pause()

power-button.service

@@ -0,0 +1,12 @@
+[Unit]
+Description=Power Button Service
+After=multi.user.target
+
+[Service]
+Type=simple
+WorkingDirectory=$workingDirectory
+ExecStart=$execStart
+Restart=on-failure
+
+[Install]
+WantedBy=multi-user.target