[gdm/wip/rancell/autologin-accountsservice] Pull automatic login configuration from AccountsService

[Robert Ancell <rancell src gnome org>]

commit c0d5a24a5fb4fae64ef0ea3a5bcd4d3346bb6544
Author: Robert Ancell <robert ancell canonical com>
Date:   Fri Dec 22 12:11:53 2017 +1300

    Pull automatic login configuration from AccountsService

 daemon/gdm-manager.c |  100 ++++++++++++++++++++++++++------------------------
 1 files changed, 52 insertions(+), 48 deletions(-)
---
diff --git a/daemon/gdm-manager.c b/daemon/gdm-manager.c
index 9f06196..1da042f 100644
--- a/daemon/gdm-manager.c
+++ b/daemon/gdm-manager.c
@@ -1242,46 +1242,57 @@ get_timed_login_details (GdmManager *manager,
         return enabled;
 }
 
-static gboolean
-get_automatic_login_details (GdmManager *manager,
-                             char      **usernamep)
-{
-        gboolean res;
-        gboolean enabled;
-        char    *username = NULL;
-
-        enabled = FALSE;
-        username = NULL;
-
-        res = gdm_settings_direct_get_boolean (GDM_KEY_AUTO_LOGIN_ENABLE, &enabled);
-        if (res && enabled) {
-            res = gdm_settings_direct_get_string (GDM_KEY_AUTO_LOGIN_USER, &username);
+static gchar *
+get_automatic_login_user (GdmManager *manager)
+{
+        g_autoptr(GVariant) result = NULL;
+        g_autoptr(GVariantIter) iter = NULL;
+        const gchar *path;
+        g_autoptr(GError) error = NULL;
+
+        result = g_dbus_connection_call_sync (manager->priv->connection,
+                                              "org.freedesktop.Accounts",
+                                              "/org/freedesktop/Accounts",
+                                              "org.freedesktop.Accounts",
+                                              "ListCachedUsers",
+                                              g_variant_new ("()"),
+                                              G_VARIANT_TYPE ("(ao)"),
+                                              G_DBUS_CALL_FLAGS_NONE,
+                                              -1,
+                                              NULL,
+                                              &error);
+        if (result == NULL) {
+                g_warning ("Failed to get automatic login details from AccountsService: %s", error->message);
+                return NULL;
         }
 
-        if (enabled && res && username != NULL && username[0] != '\0') {
-                goto out;
-        }
+        g_variant_get (result, "(ao)", &iter);
+        while (g_variant_iter_next (iter, "&o", &path)) {
+                g_autoptr(GDBusProxy) proxy = NULL;
+                g_autoptr(GVariant) username = NULL;
+                g_autoptr(GVariant) automatic_login = NULL;
+                g_autoptr(GError) user_error = NULL;
+
+                proxy = g_dbus_proxy_new_sync (manager->priv->connection,
+                                               0, NULL,
+                                               "org.freedesktop.Accounts",
+                                               path,
+                                               "org.freedesktop.Accounts.User",
+                                               NULL,
+                                               &user_error);
+                if (proxy == NULL) {
+                        g_warning ("Failed to get automatic login details from AccountsService for user %s: 
%s", path, user_error->message);
+                        continue;
+                }
 
-        g_free (username);
-        username = NULL;
-        enabled = FALSE;
+                username = g_dbus_proxy_get_cached_property (proxy, "UserName");
+                automatic_login = g_dbus_proxy_get_cached_property (proxy, "AutomaticLogin");
 
- out:
-        if (enabled) {
-                g_debug ("GdmDisplay: Got automatic login details for display: %d %s",
-                         enabled,
-                         username);
-        } else {
-                g_debug ("GdmDisplay: Got automatic login details for display: 0");
+                if (g_variant_get_boolean (automatic_login))
+                        return g_strdup (g_variant_get_string (username, NULL));
         }
 
-        if (usernamep != NULL) {
-                *usernamep = username;
-        } else {
-                g_free (username);
-        }
-
-        return enabled;
+        return NULL;
 }
 
 static void
@@ -1579,17 +1590,14 @@ set_up_session (GdmManager *manager,
         ActUser *user;
         gboolean loaded;
         gboolean is_initial_display = FALSE;
-        gboolean autologin_enabled = FALSE;
-        char *username = NULL;
+        g_autofree gchar *username = NULL;
 
         g_object_get (G_OBJECT (display), "is-initial", &is_initial_display, NULL);
 
         if (!manager->priv->ran_once && is_initial_display)
-                autologin_enabled = get_automatic_login_details (manager, &username);
-
-        if (!autologin_enabled) {
-                g_free (username);
+                username = get_automatic_login_user (manager);
 
+        if (username == NULL) {
 #ifdef HAVE_LIBXDMCP
                 if (GDM_IS_XDMCP_CHOOSER_DISPLAY (display)) {
                         set_up_chooser_session (manager, display);
@@ -1614,7 +1622,7 @@ set_up_session (GdmManager *manager,
                 operation = g_new (UsernameLookupOperation, 1);
                 operation->manager = g_object_ref (manager);
                 operation->display = g_object_ref (display);
-                operation->username = username;
+                operation->username = g_steal_pointer (&username);
 
                 g_signal_connect (user,
                                   "notify::is-loaded",
@@ -2216,8 +2224,7 @@ on_session_conversation_started (GdmSession *session,
                                  GdmManager *manager)
 {
         GdmDisplay *display;
-        gboolean    enabled;
-        char       *username;
+        g_autofree gchar *username = NULL;
 
         g_debug ("GdmManager: session conversation started for service %s", service_name);
 
@@ -2236,9 +2243,8 @@ on_session_conversation_started (GdmSession *session,
                 return;
         }
 
-        enabled = get_automatic_login_details (manager, &username);
-
-        if (! enabled) {
+        username = get_automatic_login_user (manager);
+        if (username == NULL) {
                 return;
         }
 
@@ -2247,8 +2253,6 @@ on_session_conversation_started (GdmSession *session,
         /* service_name will be "gdm-autologin"
          */
         gdm_session_setup_for_user (session, service_name, username);
-
-        g_free (username);
 }
 
 static void