[gdm] local-display-factory: don't use seat0 if logind not running

[Ray Strode <halfline src gnome org>]

commit 9ba521c06b5ed0bb58b5b9b87f233fa9f9a590ee
Author: Ray Strode <rstrode redhat com>
Date:   Thu Mar 19 22:16:43 2015 -0400

    local-display-factory: don't use seat0 if logind not running
    
    We currently only allow ConsoleKit seats if GDM is built without systemd
    support, but it's possible to build GDM with systemd support and not
    be running logind.
    
    This commit fixes it to do a run time check.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=746497

 daemon/gdm-local-display-factory.c |   12 ++++++++----
 1 files changed, 8 insertions(+), 4 deletions(-)
---
diff --git a/daemon/gdm-local-display-factory.c b/daemon/gdm-local-display-factory.c
index ba01b2f..af15617 100644
--- a/daemon/gdm-local-display-factory.c
+++ b/daemon/gdm-local-display-factory.c
@@ -197,15 +197,19 @@ store_display (GdmLocalDisplayFactory *factory,
 static const char *
 get_seat_of_transient_display (GdmLocalDisplayFactory *factory)
 {
-        const char *seat_id;
+        const char *seat_id = NULL;
 
         /* FIXME: don't hardcode seat */
 #ifdef WITH_SYSTEMD
-        seat_id = SYSTEMD_SEAT0_PATH;
-#else
-        seat_id = CK_SEAT1_PATH;
+        if (LOGIND_RUNNING() > 0) {
+                seat_id = SYSTEMD_SEAT0_PATH;
+        }
 #endif
 
+        if (seat_id == NULL) {
+                seat_id = CK_SEAT1_PATH;
+        }
+
         return seat_id;
 }