Merge pull request #224 from knuton/multiple-power-buttons

Support for multiple 'Power Button's

Author: yfyf

application/power-management/default.nix

@@ -60,7 +60,7 @@ in {
 
   systemd.services.power-button-shutdown = {
     enable = true;
-    description = "Detect Power Button key presses, by Power Button device only and not remote controls, then shutdown computer";
+    description = "Handle Power Button device key presses.";
     wantedBy = [ "multi-user.target" ];
     serviceConfig = {
       ExecStart = "${power-button-shutdown}/bin/power-button-shutdown";

application/power-management/power-button-shutdown.py

@@ -2,22 +2,59 @@
 
 import evdev
 import logging
-import os
+import subprocess
 import sys
+import threading
 
 logging.basicConfig(level=logging.INFO)
 
-devices = [evdev.InputDevice(path) for path in evdev.list_devices()]
-device_names = ', '.join([d.name for d in devices])
-logging.info(f'Found devices: {device_names}')
+def handle_device(device):
+    """Handle power key presses for the given input device by invoking poweroff."""
 
-power_off_device = next((d for d in devices if d.name == 'Power Button'), None)
-if power_off_device is None:
-  logging.error(f'Power Button device not found')
-  sys.exit(1)
+    logging.info(f'Listening to Power Button on device {device.path}')
+    try:
+        for event in device.read_loop():
+            if event.type == evdev.ecodes.EV_KEY and event.code == evdev.ecodes.KEY_POWER and event.value:
+                logging.info(f'KEY_POWER detected on {device.path}, shutting down')
+                subprocess.run(['systemctl', 'start', 'poweroff.target'], check=True)
+    except Exception as e:
+        logging.error(f'Error handling {device.path}: {e}')
+
+def get_power_button_devices():
+    """Get all input devices which identify as 'Power Button' and have a power key."""
+
+    devices = [evdev.InputDevice(path) for path in evdev.list_devices()]
+
+    power_button_devices = []
+    for device in devices:
+        try:
+            if device.name == 'Power Button':
+                ev_capabilities = device.capabilities().get(evdev.ecodes.EV_KEY, [])
+                if evdev.ecodes.KEY_POWER in ev_capabilities:
+                    power_button_devices.append(device)
+        except Exception as e:
+            logging.warning(f'Failed to inspect {device.path}: {e}')
+
+    return power_button_devices
+
+# Identify Power Button devices
+power_button_devices = get_power_button_devices()
+if not power_button_devices:
+    logging.error('No Power Button devices found')
+    sys.exit(1)
+logging.info(f'Found {len(power_button_devices)} Power Button device(s)')
+
+# Start a thread with a handler for each identified device
+handler_threads = []
+for device in power_button_devices:
+    thread = threading.Thread(target=handle_device, args=(device,))
+    thread.start()
+    handler_threads.append(thread)
+
+# Exit gracefully if a handler executes
+try:
+    for thread in handler_threads:
+        thread.join()
+except KeyboardInterrupt:
+    sys.exit(0)
 
-logging.info(f'Listening to Power Button on device {power_off_device.path}')
-for event in power_off_device.read_loop():
-  if event.type == evdev.ecodes.EV_KEY and evdev.ecodes.KEY[event.code] == 'KEY_POWER' and event.value:
-    logging.info('KEY_POWER detected on Power Button device, shutting down')
-    os.system('systemctl start poweroff.target')

controller/Changelog.md

@@ -17,6 +17,7 @@
 - controller: Suppress password prompt for open WiFi networks
 - controller: Explicitly mark WiFi networks with unsupported authentication methods
 - controller: Improve error messages when connecting to WiFi networks fails
+- os: Extend Power Button handling to multiple devices
 
 ## Removed
 

testing/integration/power-button-shutdown.nix

@@ -0,0 +1,44 @@
+let
+  pkgs = import ../../pkgs { };
+in
+pkgs.testers.runNixOSTest {
+  name = "ACPI power button handling";
+
+  nodes = {
+    machine = { config, pkgs, ... }: {
+      imports = [ ../../application/power-management ];
+    };
+  };
+
+  extraPythonPackages = ps: [
+    ps.colorama
+    ps.types-colorama
+  ];
+
+  testScript = {nodes}:
+''
+${builtins.readFile ../helpers/nixos-test-script-helpers.py}
+import time
+
+with TestPrecondition("Power Button has been recognized"):
+    machine.start()
+    machine.wait_for_unit("multi-user.target")
+    machine.wait_for_console_text("Power Button")
+
+    print(machine.succeed("cat /proc/bus/input/devices"))
+
+with TestCase("Short press on power and sleep from regular keyboard are ignored"):
+    # https://github.com/qemu/qemu/blob/master/pc-bios/keymaps/en-us
+    machine.send_monitor_command("sendkey 0xde") # XF86PowerOff
+    machine.send_monitor_command("sendkey 0xdf") # XF86Sleep
+    time.sleep(5)
+    machine.succeed("echo still alive", timeout=1)
+
+with TestCase("ACPI shutdown command invokes shutdown"):
+    machine.send_monitor_command("system_powerdown")
+    machine.wait_for_console_text("Stopped target Multi-User System")
+
+# Test script does not finish on its own after shutdown
+exit(0)
+'';
+}