gio: Add hack to close up dbus-daemon race

If gio open exits before the program it starts fully activates, then
the dbus-daemon may avoid doing the activating method call.

This commit works around the problem by pinging the activated application,
and waiting for a reply.

Same workaround is used in gtk-launch and was used in gvfs-open before
it was replaced by gio open.

https://bugzilla.gnome.org/show_bug.cgi?id=780296

gio/gio-tool-open.c

@@ -20,6 +20,7 @@
 #include "config.h"
 
 #include <gio/gio.h>
+#include <gio/gdesktopappinfo.h>
 #include <gi18n.h>
 
 #include "gio-tool.h"
@@ -29,6 +30,67 @@ static const GOptionEntry entries[] = {
   { NULL }
 };
 
+static gboolean
+get_bus_name_and_path_from_uri (const char *uri,
+                                char **bus_name_out,
+                                char **object_path_out)
+{
+  GAppInfo *app_info = NULL;
+  char *bus_name = NULL;
+  char *object_path = NULL;
+  char *uri_scheme;
+  const char *filename;
+  char *basename = NULL;
+  char *p;
+  gboolean got_name = FALSE;
+
+  uri_scheme = g_uri_parse_scheme (uri);
+  if (uri_scheme && uri_scheme[0] != '\0')
+    app_info = g_app_info_get_default_for_uri_scheme (uri_scheme);
+  g_free (uri_scheme);
+
+  if (app_info == NULL)
+    {
+      GFile *file;
+
+      file = g_file_new_for_uri (uri);
+      app_info = g_file_query_default_handler (file, NULL, NULL);
+      g_object_unref (file);
+    }
+
+  if (app_info == NULL || !G_IS_DESKTOP_APP_INFO (app_info) ||
+      !g_desktop_app_info_get_boolean (G_DESKTOP_APP_INFO (app_info), "DBusActivatable"))
+    goto out;
+
+  filename = g_desktop_app_info_get_filename (G_DESKTOP_APP_INFO (app_info));
+  if (filename == NULL)
+    goto out;
+
+  basename = g_path_get_basename (filename);
+  if (!g_str_has_suffix (basename, ".desktop"))
+    goto out;
+
+  basename[strlen (basename) - strlen (".desktop")] = '\0';
+  if (!g_dbus_is_name (basename))
+    goto out;
+
+  bus_name = g_strdup (basename);
+  object_path = g_strdup_printf ("/%s", bus_name);
+  for (p = object_path; *p != '\0'; p++)
+    if (*p == '.')
+      *p = '/';
+
+  *bus_name_out = g_steal_pointer (&bus_name);
+  *object_path_out = g_steal_pointer (&object_path);
+  got_name = TRUE;
+
+out:
+  g_clear_object (&app_info);
+  g_clear_pointer (&basename, g_free);
+
+  return got_name;
+}
+
 int
 handle_open (int argc, char *argv[], gboolean do_help)
 {
@@ -92,6 +154,33 @@ handle_open (int argc, char *argv[], gboolean do_help)
 	  success = FALSE;
 	}
 
+      /* FIXME: This chunk of madness is a workaround for a dbus-daemon bug.
+       * See https://bugzilla.gnome.org/show_bug.cgi?id=780296
+       */
+      if (res)
+        {
+          char *bus_name = NULL;
+          char *object_path = NULL;
+
+          if (get_bus_name_and_path_from_uri (uri, &bus_name, &object_path))
+            {
+              GDBusConnection *connection;
+              connection = g_bus_get_sync (G_BUS_TYPE_SESSION, NULL, NULL);
+
+              if (connection)
+                g_dbus_connection_call_sync (connection,
+                                             bus_name,
+                                             object_path,
+                                             "org.freedesktop.DBus.Peer",
+                                             "Ping",
+                                             NULL, NULL,
+                                             G_DBUS_CALL_FLAGS_NONE, -1, NULL, NULL);
+              g_clear_object (&connection);
+              g_free (bus_name);
+              g_free (object_path);
+            }
+        }
+
       g_object_unref (file);
       g_free (uri);
     }