[mutter/wip/benzea/systemd-user] launcher: Explicitly look up object path for seat

[Benjamin Berg <bberg src gnome org>]

commit 01f535e2ec0af080943229d426b42b5ea8e78592
Author: Benjamin Berg <bberg redhat com>
Date:   Fri May 10 19:29:47 2019 +0200

    launcher: Explicitly look up object path for seat
    
    If mutter is running as a systemd user service, then we cannot use the
    magic "self" session for the ID lookup. For now we need to lookup the ID
    explicitly. Eventually we can change to use the magic "auto" paths for
    both the session and seat, but that will require systemd v243.
    
    See also https://github.com/systemd/systemd/pull/12424#issuecomment-487962314
    
    https://gitlab.gnome.org/GNOME/mutter/merge_requests/571

 src/backends/native/meta-launcher.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)
---
diff --git a/src/backends/native/meta-launcher.c b/src/backends/native/meta-launcher.c
index 93a1ca2f1..680749df5 100644
--- a/src/backends/native/meta-launcher.c
+++ b/src/backends/native/meta-launcher.c
@@ -251,13 +251,15 @@ get_session_proxy (GCancellable *cancellable,
 }
 
 static Login1Seat *
-get_seat_proxy (GCancellable *cancellable,
+get_seat_proxy (gchar        *seat_id,
+                GCancellable *cancellable,
                 GError      **error)
 {
+  g_autofree char *seat_proxy_path = get_escaped_dbus_path ("/org/freedesktop/login1/seat", seat_id);
   Login1Seat *seat = login1_seat_proxy_new_for_bus_sync (G_BUS_TYPE_SYSTEM,
                                                          G_DBUS_PROXY_FLAGS_DO_NOT_AUTO_START,
                                                          "org.freedesktop.login1",
-                                                         "/org/freedesktop/login1/seat/self",
+                                                         seat_proxy_path,
                                                          cancellable, error);
   if (!seat)
     g_prefix_error(error, "Could not get seat proxy: ");
@@ -493,6 +495,7 @@ meta_launcher_new (GError **error)
   g_autoptr (Login1Session) session_proxy = NULL;
   g_autoptr (Login1Seat) seat_proxy = NULL;
   g_autofree char *seat_id = NULL;
+  g_autofree char *seat_proxy_path = NULL;
   gboolean have_control = FALSE;
 
   session_proxy = get_session_proxy (NULL, error);
@@ -511,7 +514,7 @@ meta_launcher_new (GError **error)
   if (!seat_id)
     goto fail;
 
-  seat_proxy = get_seat_proxy (NULL, error);
+  seat_proxy = get_seat_proxy (seat_id, NULL, error);
   if (!seat_proxy)
     goto fail;