[nautilus] mime-actions: check for name owner for PackageKit

[Cosimo Cecchi <cosimoc src gnome org>]

commit 12dedcc4100ea01b2639be5d4f46a87fe171ad86
Author: Cosimo Cecchi <cosimo endlessm com>
Date:   Mon Nov 16 13:49:50 2015 -0800

    mime-actions: check for name owner for PackageKit
    
    We might not have a PackageKit name owner. Check for that case, or the
    system will think that it can install extra applications.

 src/nautilus-mime-actions.c |   11 +++++++----
 1 files changed, 7 insertions(+), 4 deletions(-)
---
diff --git a/src/nautilus-mime-actions.c b/src/nautilus-mime-actions.c
index 493aee4..a55469a 100644
--- a/src/nautilus-mime-actions.c
+++ b/src/nautilus-mime-actions.c
@@ -1157,18 +1157,19 @@ pk_proxy_appeared_cb (GObject *source,
                      gpointer user_data)
 {
         ActivateParametersInstall *parameters_install = user_data;
-       char *mime_type;
+       char *mime_type, *name_owner;
        char *error_message;
        GtkWidget *dialog;
         GDBusProxy *proxy;
        GError *error = NULL;
 
        proxy = g_dbus_proxy_new_for_bus_finish (res, &error);
+       name_owner = g_dbus_proxy_get_name_owner (proxy);
 
-       if (error != NULL) {
+       if (error != NULL || name_owner == NULL) {
                g_warning ("Couldn't call Modify on the PackageKit interface: %s",
-                          error->message);
-               g_error_free (error);
+                          error != NULL ? error->message : "no owner for PackageKit");
+               g_clear_error (&error);
 
                /* show an unhelpful dialog */
                show_unhandled_type_error (parameters_install);
@@ -1178,6 +1179,8 @@ pk_proxy_appeared_cb (GObject *source,
                return;
        }
 
+       g_free (name_owner);
+
        mime_type = nautilus_file_get_mime_type (parameters_install->file);
        error_message = get_application_no_mime_type_handler_message (parameters_install->file,
                                                                      parameters_install->uri);