Merge pull request #407 from jodal/feature/mpris-needs-display

Turn off MPRIS if no $DISPLAY available

mopidy/frontends/mpris/__init__.py

@@ -1,5 +1,7 @@
 from __future__ import unicode_literals
 
+import os
+
 import mopidy
 from mopidy import exceptions, ext
 from mopidy.utils import formatting, config
@@ -89,6 +91,10 @@ class Extension(ext.Extension):
         return schema
 
     def validate_environment(self):
+        if 'DISPLAY' not in os.environ:
+            raise exceptions.ExtensionError(
+                'An X11 $DISPLAY is needed to use D-Bus')
+
         try:
             import dbus  # noqa
         except ImportError as e:

mopidy/frontends/mpris/actor.py

@@ -1,6 +1,7 @@
 from __future__ import unicode_literals
 
 import logging
+import os
 
 import pykka
 
@@ -10,10 +11,14 @@ from mopidy.frontends.mpris import objects
 logger = logging.getLogger('mopidy.frontends.mpris')
 
 try:
-    import indicate
-except ImportError as import_error:
-    indicate = None  # noqa
-    logger.debug('Startup notification will not be sent (%s)', import_error)
+    indicate = None
+    if 'DISPLAY' in os.environ:
+        import indicate
+except ImportError:
+    pass
+
+if indicate is None:
+    logger.debug('Startup notification will not be sent')
 
 
 class MprisFrontend(pykka.ThreadingActor, CoreListener):