[rygel] core: Make it possible to set UDN

[Jens Georg <jensgeorg src gnome org>]

commit 202fcfc366c3264481ba468010b0042b34ca58e8
Author: Jens Georg <mail jensge org>
Date:   Sat Aug 27 16:49:07 2016 +0200

    core: Make it possible to set UDN
    
    Signed-off-by: Jens Georg <mail jensge org>

 src/librygel-core/rygel-root-device-factory.vala |    9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletions(-)
---
diff --git a/src/librygel-core/rygel-root-device-factory.vala 
b/src/librygel-core/rygel-root-device-factory.vala
index 5e8fe36..0750b17 100644
--- a/src/librygel-core/rygel-root-device-factory.vala
+++ b/src/librygel-core/rygel-root-device-factory.vala
@@ -137,7 +137,14 @@ public class Rygel.RootDeviceFactory : Object,
         }
         var udn = file.get_udn ();
         if (udn == null || udn == "") {
-            file.set_udn ("uuid:" + GUPnP.get_uuid ());
+            // Check if we have a fixed UUID for this plugin
+            try {
+                var config = MetaConfig.get_default ();
+                udn = config.get_string (plugin.name, "uuid");
+            } catch (Error error) {
+                udn = GUPnP.get_uuid ();
+            }
+            file.set_udn ("uuid:" + udn);
         }
 
         file.save (desc_path);