[seahorse] GKR: use a temp workaround for broken libsecret VAPI.

[Niels De Graef <nielsdg src gnome org>]

commit 248f839da86dceb88dfe4001958c5831e568c085
Author: Niels De Graef <nielsdegraef gmail com>
Date:   Sat Jan 27 17:16:32 2018 +0100

    GKR: use a temp workaround for broken libsecret VAPI.
    
    This fixes a crash at startup.

 gkr/gkr-backend.vala |   34 +++++++++++++++++++---------------
 1 files changed, 19 insertions(+), 15 deletions(-)
---
diff --git a/gkr/gkr-backend.vala b/gkr/gkr-backend.vala
index 9003c5a..1abdab5 100644
--- a/gkr/gkr-backend.vala
+++ b/gkr/gkr-backend.vala
@@ -17,6 +17,10 @@
  * License along with this program; if not, see <http://www.gnu.org/licenses/>.
  */
 
+// FIXME: this is needed since the libsecret VAPI is broken (string is not marked as unowned).
+//        We're also using the sync version for the time being since it becomes a mess otherwise.
+extern unowned string? secret_service_read_alias_dbus_path_sync (Secret.Service service, string alias, 
Cancellable? cancellable = null) throws GLib.Error;
+
 namespace Seahorse {
 namespace Gkr {
 
@@ -170,27 +174,27 @@ public class Backend: GLib.Object , Gcr.Collection, Seahorse.Backend {
                return this._keyrings.get_values();
        }
 
-       private void read_alias(string name) {
+       private async void read_alias(string name) {
                if (this._service == null)
                        return;
-               this._service.read_alias_dbus_path.begin(name, null, (obj, res) => {
-                       try {
-                               var object_path = this._service.read_alias_dbus_path.end(res);
-                               if (object_path != null) {
-                                       this._aliases.insert(name, object_path);
-                                       notify_property("aliases");
-                               }
-                       } catch (GLib.Error err) {
-                               GLib.warning("Couldn't read secret service alias %s: %s", name, err.message);
-                       }
-               });
 
+               try {
+            // FIXME: see the comment at the top of the file about the broken VAPI.
+            // Once the bindings are fixed, use the async version again.
+                   var object_path = secret_service_read_alias_dbus_path_sync(this._service, name);
+            if (object_path != null) {
+                this._aliases[name] = object_path;
+                notify_property("aliases");
+            }
+        } catch (GLib.Error err) {
+            warning("Couldn't read secret service alias %s: %s", name, err.message);
+        }
        }
 
        private void refresh_aliases() {
-               read_alias("default");
-               read_alias("session");
-               read_alias("login");
+               read_alias.begin ("default");
+               read_alias.begin ("session");
+               read_alias.begin ("login");
        }
 
        public void refresh() {