[gdm] gdm-sessions: force a session bus for non-seat0 session

[Ray Strode <halfline src gnome org>]

commit 2b52d8933c8ab38e7ee83318da2363d00d8c5581
Author: Ray Strode <rstrode redhat com>
Date:   Wed Sep 20 09:47:53 2017 -0400

    gdm-sessions: force a session bus for non-seat0 session
    
    Eventually, our software should become "multi-seat aware",
    where it takes into account multiple seats at a time
    for the user (even if it's just putting up a dialog saying
    "user is busy" on all but one seat).
    
    We're not there yet. And user bus currently breaks XDMCP
    (which should really spawn session with its own separate user,
     but again, we're not there yet).
    
    This commit changes GDM to start a session bus for all non-seat0
    displays, as a near-term workaround.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=787943

 daemon/gdm-session.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)
---
diff --git a/daemon/gdm-session.c b/daemon/gdm-session.c
index eece5fb..1f1f6ee 100644
--- a/daemon/gdm-session.c
+++ b/daemon/gdm-session.c
@@ -2791,7 +2791,12 @@ gdm_session_start_session (GdmSession *self,
                                                            self->priv->selected_program);
                         }
                 } else {
-                        program = g_strdup (self->priv->selected_program);
+                        if (g_strcmp0 (self->priv->display_seat_id, "seat0") != 0) {
+                                program = g_strdup_printf ("dbus-run-session -- %s",
+                                                           self->priv->selected_program);
+                        } else {
+                                program = g_strdup (self->priv->selected_program);
+                        }
                 }
         }