LocaleManager: set system locale and keyboard via dbus

data/locale.policy.in

@@ -15,8 +15,7 @@
       <allow_inactive>no</allow_inactive>
       <allow_active>auth_admin_keep</allow_active>
     </defaults>
-    <annotate key="org.freedesktop.policykit.exec.path">/usr/bin/localectl</annotate>
-    <annotate key="org.freedesktop.policykit.imply">org.freedesktop.locale1.set-locale org.debian.apt.install-or-remove-packages</annotate>
+    <annotate key="org.freedesktop.policykit.imply">org.debian.apt.install-or-remove-packages</annotate>
   </action>
 
 </policyconfig>

src/LocaleManager.vala

@@ -26,14 +26,14 @@ public interface AccountProxy : GLib.Object {
 public interface Locale1Proxy : GLib.Object {
     public abstract string[] locale { owned get; }
 
-    public abstract void set_locale (string[] arg_0, bool arg_1) throws GLib.Error;
-    public abstract void set_x11_keyboard (
-        string arg_0,
-        string arg_1,
-        string arg_2,
-        string arg_3,
-        bool arg_4,
-        bool arg_5
+    public abstract async void set_locale (string[] locale, bool interactive) throws GLib.Error;
+    public abstract async void set_x11_keyboard (
+        string layout,
+        string model,
+        string variant,
+        string options,
+        bool convert,
+        bool interactive
     ) throws GLib.Error;
 }
 
@@ -167,70 +167,6 @@ namespace SwitchboardPlugLocale {
             return get_system_locale () ?? "en_US.UTF-8";
         }
 
-        private void localectl_set_locale (string locale, string? format = null) throws GLib.Error {
-            debug ("setting system-wide locale via localectl");
-            if (Utils.get_permission ().allowed) {
-                string output;
-                int status;
-                string cli = "/usr/bin/localectl";
-                string command = "set-locale";
-
-                try {
-                    if (format == null) {
-                        Process.spawn_sync (null,
-                            {"pkexec", cli, command, locale},
-                            Environ.get (),
-                            SpawnFlags.SEARCH_PATH,
-                            null, out output,
-                            null, out status);
-                        if (output != "") {
-                            critical ("localectl failed to set locale");
-                        }
-                    } else {
-                        Process.spawn_sync (null,
-                            {"pkexec", cli, command, locale, "LC_TIME=%s".printf (format),
-                             "LC_NUMERIC=%s".printf (format), "LC_MONETARY=%s".printf (format),
-                             "LC_MEASUREMENT=%s".printf (format)},
-                            Environ.get (),
-                            SpawnFlags.SEARCH_PATH,
-                            null, out output,
-                            null, out status);
-                        if (output != "") {
-                            critical ("localectl failed to set locale");
-                        }
-                    }
-                } catch (Error e) {
-                    critical ("localectl failed to set locale");
-                    throw e;
-                }
-            }
-        }
-
-        private void localectl_set_x11_keymap (string layouts, string variants) throws GLib.Error {
-            if (Utils.get_permission ().allowed) {
-                string output;
-                int status;
-                string cli = "/usr/bin/localectl";
-                string command = "set-x11-keymap";
-
-                try {
-                    Process.spawn_sync (null,
-                        {"pkexec", cli, command, layouts, "", variants},
-                        Environ.get (),
-                        SpawnFlags.SEARCH_PATH,
-                        null, out output,
-                        null, out status);
-
-                    if (output != "") {
-                        critical ("localectl failed to set x11 keymap");
-                    }
-                } catch (Error e) {
-                    critical ("localectl failed to set x11 keymap");
-                    throw e;
-                }
-            }
-        }
-
         public string? get_system_locale () {
             foreach (unowned var locale in locale1_proxy.locale) {
                 if (locale.has_prefix ("LANG=")) {
@@ -241,19 +177,20 @@ namespace SwitchboardPlugLocale {
             return null;
         }
 
-        public void apply_to_system (string language, string? format) {
-            /*
-             * This is a temporary solution for setting the system-wide locale.
-             * I am assuming systemd in version 204 (which we currently ship from Ubuntu repositories)
-             * is broken as SetLocale does not recognize the aquired polkit permission. Maybe that is
-             * intended, but I do not believe this. May be fixed in a later version of systemd and should
-             * be reversed (TODO) when introducing a newer version of systemd to elementary OS.
-             */
+        public async void apply_to_system (string language, string? format) throws GLib.DBusError {
+            string[] locale = {"LANG=%s".printf (language)};
+
+            if (format != null) {
+                locale += "LC_TIME=%s".printf (format);
+                locale += "LC_NUMERIC=%s".printf (format);
+                locale += "LC_MONETARY=%s".printf (format);
+                locale += "LC_MEASUREMENT=%s".printf (format);
+            }
 
             try {
-                localectl_set_locale ("LANG=%s".printf (language), format);
+                yield locale1_proxy.set_locale (locale, true);
             } catch (Error e) {
-                warning (e.message);
+                throw (e);
             }
 
             string layouts = "";
@@ -282,10 +219,16 @@ namespace SwitchboardPlugLocale {
             }
 
             try {
-                /* TODO: temporary solution for systemd-localed polkit problem */
-                localectl_set_x11_keymap (layouts, variants);
+                yield locale1_proxy.set_x11_keyboard (
+                    layouts,
+                    "",
+                    variants,
+                    "",
+                    true,
+                    true
+                );
             } catch (Error e) {
-                warning (e.message);
+                throw (e);
             }
         }
 

src/Widgets/LocaleSetting.vala

@@ -201,13 +201,7 @@ namespace SwitchboardPlugLocale.Widgets {
                 restart_infobar.revealed = true;
             });
 
-            set_system_button.clicked.connect (() => {
-                if (!Utils.allowed_permission ()) {
-                    return;
-                }
-
-                on_applied_to_system ();
-            });
+            set_system_button.clicked.connect (on_applied_to_system);
 
             installer.check_missing_finished.connect (on_check_missing_finished);
         }
@@ -333,9 +327,28 @@ namespace SwitchboardPlugLocale.Widgets {
             var selected_locale = get_selected_locale ();
             var selected_format = get_format ();
             debug ("Setting system language to '%s' and format to '%s'", selected_locale, selected_format);
-            lm.apply_to_system (selected_locale, selected_format);
+            lm.apply_to_system.begin (selected_locale, selected_format, (obj, res) => {
+                try {
+                    lm.apply_to_system.end (res);
+                    restart_infobar.revealed = true;
+                } catch (Error e) {
+                    if (e.matches (GLib.DBusError.quark (), GLib.DBusError.ACCESS_DENIED)) {
+                        return;
+                    }
 
-            restart_infobar.revealed = true;
+                    var dialog = new Granite.MessageDialog (
+                        _("Can't set system locale"),
+                        e.message,
+                        new ThemedIcon ("preferences-desktop-locale")
+                    ) {
+                        badge_icon = new ThemedIcon ("dialog-error"),
+                        modal = true,
+                        transient_for = ((Gtk.Application) Application.get_default ()).active_window
+                    };
+                    dialog.present ();
+                    dialog.response.connect (dialog.destroy);
+                }
+            });
         }
 
         private class Locale : Object {