[tracker/sam/diagrams: 6/9] writeback: Improve error when writeback fails due to missing module

[Sam Thursfield <sthursfield src gnome org>]

commit 6d509d71ee93940a098aa4bd70e8fcf2dfdf2dcc
Author: Sam Thursfield <sam afuera me uk>
Date:   Tue Dec 23 16:15:09 2014 +0000

    writeback: Improve error when writeback fails due to missing module

 src/tracker-writeback/tracker-writeback.c |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)
---
diff --git a/src/tracker-writeback/tracker-writeback.c b/src/tracker-writeback/tracker-writeback.c
index c80f240..5bc2180 100644
--- a/src/tracker-writeback/tracker-writeback.c
+++ b/src/tracker-writeback/tracker-writeback.c
@@ -597,10 +597,16 @@ handle_method_call_perform_writeback (TrackerController     *controller,
                g_task_run_in_thread (task, io_writeback_job);
                g_object_unref (task);
        } else {
+               char *rdf_types_string;
+               rdf_types_string = g_strjoinv (", ", rdf_types);
                g_dbus_method_invocation_return_error (invocation,
                                                       TRACKER_DBUS_ERROR,
                                                       TRACKER_DBUS_ERROR_UNSUPPORTED,
-                                                      "No module for rdf types");
+                                                      "None of %i writeback modules matched any of the "
+                                                      "given RDF types: %s",
+                                                      g_hash_table_size (priv->modules),
+                                                      rdf_types_string);
+               g_free (rdf_types_string);
        }
 
        g_free (rdf_types);