[gdm] show the username input box when there's no local user

[William Jon McCann <mccann src gnome org>]

commit 14b7f7ea88f1d8013d8e641f5ae69413f7cb2492
Author: Vincent Untz <vuntz gnome org>
Date:   Mon Jun 21 22:37:08 2010 -0400

    show the username input box when there's no local user
    
    When a system is configured for NIS so doesn't have any local users besides root,
    the greeter only shows a lone 'login' button and the waiting
    cursor but is empty otherwise. Ie there is no way to enter a user name.
    Pressing the login button leads to X restart.
    
    My guess is that commits 5f8723c4fccff6aed79edbe635e3e16fa74a42d1 and
    6ef14933e32173235eaafb0bc9d7188accce3364 introduced this bug.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=622069

 gui/simple-greeter/gdm-chooser-widget.c       |    1 +
 gui/simple-greeter/gdm-greeter-login-window.c |   26 ++++++++++++++++++++----
 2 files changed, 22 insertions(+), 5 deletions(-)
---
diff --git a/gui/simple-greeter/gdm-chooser-widget.c b/gui/simple-greeter/gdm-chooser-widget.c
index ed4a3c1..e25cf07 100644
--- a/gui/simple-greeter/gdm-chooser-widget.c
+++ b/gui/simple-greeter/gdm-chooser-widget.c
@@ -2749,6 +2749,7 @@ gdm_chooser_widget_propagate_pending_key_events (GdmChooserWidget *widget)
 void
 gdm_chooser_widget_loaded (GdmChooserWidget *widget)
 {
+        update_chooser_visibility (widget);
         g_signal_emit (widget, signals[LOADED], 0);
         queue_move_cursor_to_top (widget);
 }
diff --git a/gui/simple-greeter/gdm-greeter-login-window.c b/gui/simple-greeter/gdm-greeter-login-window.c
index fc9c7e3..976ae9f 100644
--- a/gui/simple-greeter/gdm-greeter-login-window.c
+++ b/gui/simple-greeter/gdm-greeter-login-window.c
@@ -443,8 +443,15 @@ set_log_in_button_mode (GdmGreeterLoginWindow *login_window,
         }
 }
 
+static gboolean
+user_chooser_has_no_user (GdmGreeterLoginWindow *login_window)
+{
+        return (login_window->priv->user_chooser_loaded &&
+                gdm_chooser_widget_get_number_of_items (GDM_CHOOSER_WIDGET (login_window->priv->user_chooser)) == 0);
+}
+
 static void
-adjust_other_login_visibility(GdmGreeterLoginWindow *login_window)
+adjust_other_login_visibility (GdmGreeterLoginWindow *login_window)
 {
         if (! login_window->priv->user_chooser_loaded) {
                 return;
@@ -641,7 +648,7 @@ reset_dialog (GdmGreeterLoginWindow *login_window,
         label = GTK_WIDGET (gtk_builder_get_object (GDM_GREETER_LOGIN_WINDOW (login_window)->priv->builder, "auth-prompt-label"));
         gtk_label_set_text (GTK_LABEL (label), "");
 
-        if (login_window->priv->user_list_disabled) {
+        if (login_window->priv->user_list_disabled || user_chooser_has_no_user (login_window)) {
                 switch_mode (login_window, MODE_AUTHENTICATION);
         } else {
                 switch_mode (login_window, dialog_mode);
@@ -682,7 +689,7 @@ gdm_greeter_login_window_ready (GdmGreeterLoginWindow *login_window)
                 retry_login (login_window);
         } else {
                 /* If the user list is disabled, then start the PAM conversation */
-                if (login_window->priv->user_list_disabled) {
+                if (login_window->priv->user_list_disabled || user_chooser_has_no_user (login_window)) {
                         g_debug ("Starting PAM conversation since user list disabled");
                         g_signal_emit (G_OBJECT (login_window), signals[USER_SELECTED],
                                        0, GDM_USER_CHOOSER_USER_OTHER);
@@ -996,7 +1003,16 @@ on_users_loaded (GdmUserChooserWidget  *user_chooser,
         update_banner_message (login_window);
         adjust_other_login_visibility (login_window);
 
-        gdm_chooser_widget_activate_if_one_item (GDM_CHOOSER_WIDGET (login_window->priv->user_chooser));
+        if (user_chooser_has_no_user (login_window)) {
+                /* There's no face browser to show */
+                login_window->priv->show_cancel_button = FALSE;
+                switch_mode (login_window, MODE_AUTHENTICATION);
+
+                g_debug ("Starting PAM conversation since no local users");
+                g_signal_emit (G_OBJECT (login_window), signals[USER_SELECTED],
+                               0, GDM_USER_CHOOSER_USER_OTHER);
+                g_signal_emit (login_window, signals[BEGIN_VERIFICATION], 0);
+        }
 }
 
 static void
@@ -1375,7 +1391,7 @@ update_banner_message (GdmGreeterLoginWindow *login_window)
         } else {
                 char *message = NULL;
                 error = NULL;
-                if (login_window->priv->user_chooser_loaded && gdm_chooser_widget_get_number_of_items (GDM_CHOOSER_WIDGET (login_window->priv->user_chooser)) == 0) {
+                if (user_chooser_has_no_user (login_window)) {
                         message = gconf_client_get_string (login_window->priv->client, KEY_BANNER_MESSAGE_TEXT_NOCHOOSER, &error);
                         if (error != NULL) {
                                 g_debug("GdmGreeterLoginWindow: unable to get nochooser banner text: %s", error->message);