For example, GNOME control center can now defined e.g.

  <action id="org.zee.example.meta">
    <description>Meta Action</description>
    <message>Example of a meta action, blabla</message>
    <defaults>
      <allow_any>no</allow_any>
      <allow_inactive>no</allow_inactive>
      <allow_active>auth_admin_keep</allow_active>
    </defaults>
    <annotate key="org.freedesktop.policykit.imply">org.freedesktop.udisks2.ata-smart-selftest org.freedesktop.udisks2.encrypted-lock-others org.freedesktop.udisks2.filesystem-unmount-others</annotate>
  </action>

and set up a single GtkLockButton for a PolkitPermission for action id
"org.zee.example.meta".

When unlocked the given subject will now be authorized for the actions
mentioned in the annotation.

Example test program:

int
main (int argc, char *argv[])
{
  PolkitSubject *subject;
  GtkWidget *window;
  GtkWidget *table;
  GMainLoop *loop;
  guint n;

  gtk_init (&argc, &argv);

  subject = polkit_unix_process_new (getpid ());

  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);

  table = gtk_table_new (1, 2, FALSE);
  for (n = 1; n < argc; n++)
    {
      const gchar *action_id = argv[n];
      GPermission *permission;
      GtkWidget *label;
      GtkWidget *lock_button;
      GError *error = NULL;

      label = gtk_label_new (action_id);

      permission = polkit_permission_new_sync (action_id, subject, NULL, &error);
      if (permission == NULL)
        {
          g_error ("Error constructing permission for action_id %s: %s (%s, %d)",
                   action_id, error->message, g_quark_to_string (error->domain), error->code);
          goto out;
        }
      lock_button = gtk_lock_button_new (permission);
      g_object_unref (permission);

      gtk_table_attach (GTK_TABLE (table), label,       0, 1, n - 1, n, GTK_FILL, GTK_FILL, 0, 0);
      gtk_table_attach (GTK_TABLE (table), lock_button, 1, 2, n - 1, n, GTK_FILL, GTK_FILL, 0, 0);
    }
  gtk_container_add (GTK_CONTAINER (window), table);

  gtk_widget_show_all (window);

  loop = g_main_loop_new (NULL, FALSE);
  g_main_loop_run (loop);

 out:
  ;
}

Compile with:

 gcc -o showpolkit showpolkit.c `pkg-config --cflags --libs polkit-gobject-1 gtk+-3.0` -g -O0

Run with:

 ./showpolkit org.freedesktop.udisks2.ata-smart-selftest org.freedesktop.udisks2.encrypted-lock-others org.freedesktop.udisks2.filesystem-unmount-others org.zee.example.meta

Signed-off-by: David Zeuthen <davidz@redhat.com>