Prevent crash after updating thunar if old thunar deamon is still running

thunar/main.c

@@ -45,6 +45,73 @@
 
 
 
+static void
+thunar_terminate_running_thunar (void)
+{
+  GDBusConnection *connection;
+  GDBusProxy      *proxy;
+  GError          *error;
+
+  error = NULL;
+  connection = g_bus_get_sync (G_BUS_TYPE_SESSION, NULL, &error);
+  g_assert_no_error (error);
+  proxy = g_dbus_proxy_new_sync (connection,
+                                 G_DBUS_PROXY_FLAGS_NONE,
+                                 NULL,
+                                 "org.xfce.Thunar",       /* bus name */
+                                 "/org/xfce/FileManager", /* object path */
+                                 "org.xfce.Thunar",       /* interface name */
+                                 NULL,
+                                 &error);
+  g_assert_no_error (error);
+  g_dbus_proxy_call_sync (proxy,
+                          "Terminate",                    /* method name */
+                          NULL,
+                          G_DBUS_CALL_FLAGS_NONE,
+                          -1,
+                          NULL,
+                          &error);
+  g_assert_no_error (error);
+  g_object_unref (proxy);
+  g_object_unref (connection);
+}
+
+
+
+static void
+thunar_dialog_ask_terminate_old_daemon_activate (GtkApplication* app, gpointer user_data)
+{
+  GtkWidget *window;
+  GtkWidget *dialog;
+  gint       result;
+
+  window = gtk_application_window_new (app);
+  dialog = gtk_message_dialog_new (GTK_WINDOW (window), GTK_DIALOG_DESTROY_WITH_PARENT, GTK_MESSAGE_QUESTION, GTK_BUTTONS_YES_NO,
+          _("Thunar cannot be launched because an older instance of thunar is still running.\n"
+            "Would you like to terminate the old thunar instance and start this instance?\n\n"
+            "Before accepting please make sure there are no pending operations (e.g. file copying) as terminating them may leave your files corrupted."));
+  result = gtk_dialog_run (GTK_DIALOG (dialog));
+  if (result == GTK_RESPONSE_YES)
+    thunar_terminate_running_thunar ();
+  gtk_widget_destroy (window);
+  g_application_quit (G_APPLICATION (app));
+}
+
+
+
+static void
+thunar_dialog_ask_terminate_old_daemon (void)
+{
+  GtkApplication *app;
+
+  app = gtk_application_new ("terminate.old.thunar.daemon", G_APPLICATION_FLAGS_NONE);
+  g_signal_connect (app, "activate", G_CALLBACK (thunar_dialog_ask_terminate_old_daemon_activate), NULL);
+  g_application_run (G_APPLICATION (app), 0, 0);
+  g_object_unref (app);
+}
+
+
+
 int
 main (int argc, char **argv)
 {
@@ -93,6 +160,16 @@ main (int argc, char **argv)
   /* use the Thunar icon as default for new windows */
   gtk_window_set_default_icon_name ("Thunar");
 
+  /* Workaround to bypass "silent fail" if new thunar version is installed while an old version still runs as daemon */
+  /* FIXME: "g_application_register" and the following logic can be removed as soon as g_application/gdbus provides a way to prevent this error */
+  g_application_register (G_APPLICATION (application), NULL, &error);
+  if (error != NULL)
+    {
+      if (error->code == G_DBUS_ERROR_UNKNOWN_METHOD && strstr (error->message, "GDBus.Error:org.freedesktop.DBus.Error.UnknownMethod: Method \"DescribeAll\" with signature \"\" on interface \"org.gtk.Actions"))
+          thunar_dialog_ask_terminate_old_daemon ();
+      g_error_free (error);
+    }
+
   /* do further processing inside gapplication */
   g_application_run (G_APPLICATION (application), argc, argv);