feat(linux): Start dbus if not running

linux/keyman-config/keyman_config/__init__.py

@@ -1,5 +1,7 @@
 import gettext
 import logging
+import os
+import subprocess
 
 from keyman_config.sentry_handling import SentryErrorHandling
 from keyman_config.version import (
@@ -77,3 +79,26 @@ def add_standard_arguments(parser):
 
 # There's no staging site for downloads
 KeymanDownloadsUrl = 'https://downloads.keyman.com'
+
+
+if (not 'DBUS_SESSION_BUS_ADDRESS' in os.environ or
+        not 'DBUS_SESSION_BUS_PID' in os.environ):
+    try:
+        # Seems dbus isn't running for the current user. Try to start it
+        # and set these environment variables
+        logging.info('Starting dbus with dbus-launch')
+        stdout = subprocess.run(
+            ('dbus-launch', '--exit-with-session'),
+            stdout=subprocess.PIPE, check=False).stdout
+        lines = stdout.decode('utf-8').splitlines()
+        for line in lines:
+            equal_sign = line.find('=')
+            if equal_sign <= 0:
+                logging.warning('Got unexpected line from dbus-launch: %s', line)
+                continue
+            name = line[:equal_sign]
+            value = line[equal_sign+1:]
+            logging.debug('Setting environment %s=%s', name, value)
+            os.environ[name] = value
+    except Exception as e:
+        logging.error('Starting dbus-launch failed with %s', e)