[gdm] display: connect to accountsservice from display object

[Ray Strode <halfline src gnome org>]

commit c5beec949373c2e41f5ca2fc1c4b50c223cef6cb
Author: Ray Strode <rstrode redhat com>
Date:   Thu Jan 29 16:20:24 2015 -0500

    display: connect to accountsservice from display object
    
    The idea is to eventually gut GdmSimpleSlave, so start by
    copying some of its functionality over to the display.
    
    This commit copies accountsservice user listing.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=744764

 daemon/gdm-display.c |   71 +++++++++++++++++++++++++++++++++++++++++++++++--
 1 files changed, 68 insertions(+), 3 deletions(-)
---
diff --git a/daemon/gdm-display.c b/daemon/gdm-display.c
index 04f8fb8..9d1915d 100644
--- a/daemon/gdm-display.c
+++ b/daemon/gdm-display.c
@@ -73,9 +73,12 @@ struct GdmDisplayPrivate
         GdmDBusDisplay       *display_skeleton;
         GDBusObjectSkeleton  *object_skeleton;
 
+        GDBusProxy           *accountsservice_proxy;
+
         guint                 is_local : 1;
         guint                 is_initial : 1;
         guint                 allow_timed_login : 1;
+        guint                 have_existing_user_accounts : 1;
 };
 
 enum {
@@ -93,6 +96,7 @@ enum {
         PROP_SLAVE_TYPE,
         PROP_IS_INITIAL,
         PROP_ALLOW_TIMED_LOGIN,
+        PROP_HAVE_EXISTING_USER_ACCOUNTS
 };
 
 static void     gdm_display_class_init  (GdmDisplayClass *klass);
@@ -522,6 +526,58 @@ gdm_display_real_prepare (GdmDisplay *self)
         return TRUE;
 }
 
+static void
+on_list_cached_users_complete (GObject       *proxy,
+                               GAsyncResult  *result,
+                               GdmDisplay    *self)
+{
+        GVariant *call_result;
+        GVariant *user_list;
+
+        call_result = g_dbus_proxy_call_finish (G_DBUS_PROXY (proxy), result, NULL);
+
+        if (!call_result) {
+                self->priv->have_existing_user_accounts = FALSE;
+        } else {
+                g_variant_get (call_result, "(@ao)", &user_list);
+                self->priv->have_existing_user_accounts = g_variant_n_children (user_list) > 0;
+                g_variant_unref (user_list);
+                g_variant_unref (call_result);
+        }
+
+        gdm_slave_start (self->priv->slave);
+}
+
+static void
+on_accountsservice_ready (GObject        *object,
+                          GAsyncResult   *result,
+                          GdmDisplay     *self)
+{
+        GError *local_error = NULL;
+
+        self->priv->accountsservice_proxy = g_dbus_proxy_new_for_bus_finish (result, &local_error);
+        if (!self->priv->accountsservice_proxy) {
+                g_error ("Failed to contact accountsservice: %s", local_error->message);
+        }
+
+        g_dbus_proxy_call (self->priv->accountsservice_proxy, "ListCachedUsers", NULL, 0, -1, NULL,
+                           (GAsyncReadyCallback)
+                           on_list_cached_users_complete, self);
+}
+
+static void
+look_for_existing_users_and_manage (GdmDisplay *self)
+{
+        g_dbus_proxy_new (self->priv->connection,
+                          0, NULL,
+                          "org.freedesktop.Accounts",
+                          "/org/freedesktop/Accounts",
+                          "org.freedesktop.Accounts",
+                          NULL,
+                          (GAsyncReadyCallback)
+                          on_accountsservice_ready, self);
+}
+
 gboolean
 gdm_display_prepare (GdmDisplay *self)
 {
@@ -556,8 +612,7 @@ gdm_display_manage (GdmDisplay *self)
         }
 
         g_timer_start (self->priv->slave_timer);
-
-        gdm_slave_start (self->priv->slave);
+        look_for_existing_users_and_manage (self);
 
         return TRUE;
 }
@@ -844,6 +899,9 @@ gdm_display_get_property (GObject        *object,
         case PROP_IS_INITIAL:
                 g_value_set_boolean (value, self->priv->is_initial);
                 break;
+        case PROP_HAVE_EXISTING_USER_ACCOUNTS:
+                g_value_set_boolean (value, self->priv->have_existing_user_accounts);
+                break;
         case PROP_ALLOW_TIMED_LOGIN:
                 g_value_set_boolean (value, self->priv->allow_timed_login);
                 break;
@@ -1249,7 +1307,13 @@ gdm_display_class_init (GdmDisplayClass *klass)
                                                                NULL,
                                                                TRUE,
                                                                G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
-
+        g_object_class_install_property (object_class,
+                                         PROP_HAVE_EXISTING_USER_ACCOUNTS,
+                                         g_param_spec_boolean ("have-existing-user-accounts",
+                                                               NULL,
+                                                               NULL,
+                                                               FALSE,
+                                                               G_PARAM_READABLE));
         g_object_class_install_property (object_class,
                                          PROP_SLAVE_TYPE,
                                          g_param_spec_gtype ("slave-type",
@@ -1302,6 +1366,7 @@ gdm_display_finalize (GObject *object)
         g_clear_object (&self->priv->display_skeleton);
         g_clear_object (&self->priv->object_skeleton);
         g_clear_object (&self->priv->connection);
+        g_clear_object (&self->priv->accountsservice_proxy);
 
         if (self->priv->access_file != NULL) {
                 g_object_unref (self->priv->access_file);