Add restart method

src/Utils/SystemUpgrade.vala

@@ -0,0 +1,52 @@
+/*
+ * Copyright (c) 2022 elementary, Inc. (https://elementary.io)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301 USA
+ *
+ * Authored by: Marius Meisenzahl <mariusmeisenzahl@gmail.com>
+ */
+
+public class About.SystemUpgrade {
+    public static void restart () {
+        get_system_instance ();
+
+        try {
+            system_instance.reboot (false);
+        } catch (GLib.Error e) {
+            critical (e.message);
+        }
+    }
+
+    [DBus (name = "org.freedesktop.login1.Manager")]
+    interface SystemInterface : Object {
+        public abstract void reboot (bool interactive) throws GLib.Error;
+    }
+
+    private static SystemInterface? system_instance;
+    private static void get_system_instance () {
+        if (system_instance == null) {
+            try {
+                system_instance = Bus.get_proxy_sync (
+                    BusType.SYSTEM,
+                    "org.freedesktop.login1",
+                    "/org/freedesktop/login1"
+                );
+            } catch (GLib.Error e) {
+                warning ("%s", e.message);
+            }
+        }
+    }
+}

src/Views/OperatingSystemView.vala

@@ -437,7 +437,7 @@ public class About.OperatingSystemView : Gtk.Grid {
                     break;
                 case State.RESTART:
                     message_dialog.destroy ();
-                    //  Utils.restart ();
+                    SystemUpgrade.restart ();
                     break;
             }
         });

src/meson.build

@@ -3,6 +3,7 @@ plug_files = files(
     'Interfaces/FirmwareClient.vala',
     'Interfaces/LoginManager.vala',
     'Utils/ARMPartDecoder.vala',
+    'Utils/SystemUpgrade.vala',
     'Views/FirmwareReleaseView.vala',
     'Views/FirmwareView.vala',
     'Views/HardwareView.vala',