GNOME theme: Restart GNOME button after applying the theme (relogin through GDM when set up, else a logout)

ui/qml/AppState.qml

@@ -18,6 +18,7 @@ Item {
     property var steps: ({})                 // id -> "wait"|"run"|"ok"|"fail"
     property var failed: []
     property bool restartNeeded: false
+    property bool reloginNeeded: false      // GNOME loads the new theme's extensions at the next login
     // Review & apply only when something would change; "Re-apply what's on"
     // is for when nothing did.
     readonly property bool canApply: computePlan().length > 0
@@ -123,7 +124,7 @@ Item {
     }
 
     // --- Password and apply ---
-    function resetRun() { steps = {}; failed = []; restartNeeded = false; runError = ""; doneCount = 0; logModel.clear(); }
+    function resetRun() { steps = {}; failed = []; restartNeeded = false; reloginNeeded = false; runError = ""; doneCount = 0; logModel.clear(); }
     function startApply(password) {
         resetRun();
         var s = {};
@@ -203,7 +204,7 @@ Item {
                 // A successful BIOS check ends with bios-ready instead, keeping
                 // the password for the flash.
                 app.sessionPassword = "";
-                app.failed = ev.failed || []; app.restartNeeded = !!ev.restart;
+                app.failed = ev.failed || []; app.restartNeeded = !!ev.restart; app.reloginNeeded = !!ev.relogin;
                 app.runError = app.errorText(ev.error);
                 app.screen = "done";
             }
@@ -249,6 +250,7 @@ Item {
             else if (a === "release") { holding = false; if (holdProgress < 1) holdProgress = 0; }
         } else if (screen === "done") {
             if (a === "accept" && restartNeeded) backend.restart();
+            else if (a === "accept" && reloginNeeded) backend.restartGnome();
             else if (a === "back" || a === "accept") backToMenu();
         }
     }

ui/qml/DoneScreen.qml

@@ -9,7 +9,8 @@ Item {
     readonly property bool problem: app.failed.length > 0 || app.runError !== ""
     readonly property string message: {
         if (app.runError) return app.runError;
-        if (!app.biosRun) return app.plan.length + (app.plan.length === 1 ? " change" : " changes") + " applied." + (app.restartNeeded ? " Some take effect after a restart." : "");
+        if (!app.biosRun) return app.plan.length + (app.plan.length === 1 ? " change" : " changes") + " applied." + (app.restartNeeded ? " Some take effect after a restart." : "")
+             + (app.reloginNeeded && !app.restartNeeded ? " GNOME shows the dock, extensions and Settings panel after you log in again: Restart GNOME does that." : "");
         if (app.failed.length) return "The BIOS was not changed.";
         return (app.bios && app.bios.dryRun ? "Dry run: nothing was flashed. " : "BIOS " + (app.biosInfo.newest || "") + " is staged and is written during the restart. ")
              + "Keep the power on and don't touch the machine until it has fully started again, even if the screen stays black.";
@@ -33,6 +34,7 @@ Item {
                 delegate: Text { required property string line; width: details.width - 12; text: line; color: "#aab5c4"; font.family: Theme.mono; font.pixelSize: 13; wrapMode: Text.WrapAnywhere } } }
         Row { anchors.horizontalCenter: parent.horizontalCenter; spacing: 14; topPadding: 8
             Btn { k: Input.g.back; text: "Back to the menu"; height: 52; onClicked: app.act("back") }
-            Btn { visible: app.restartNeeded; k: Input.g.ok; text: "Restart now"; primary: true; height: 52; onClicked: app.backend.restart() } }
+            Btn { visible: app.restartNeeded; k: Input.g.ok; text: "Restart now"; primary: true; height: 52; onClicked: app.backend.restart() }
+            Btn { visible: app.reloginNeeded && !app.restartNeeded; k: Input.g.ok; text: "Restart GNOME"; primary: true; height: 52; onClicked: app.backend.restartGnome() } }
     }
 }

ui/steamify-ui

@@ -345,6 +345,16 @@ class Backend(QObject):
     def restart(self):
         QProcess.startDetached("systemctl", ["reboot"])
 
+    @Slot()
+    def restartGnome(self):
+        # GNOME Shell on Wayland can't restart in place: end the session. With GDM autologin (the SteamOS conversion)
+        # Steamify's helper logs the user straight back in; else a plain logout.
+        import subprocess
+        helper = "/usr/local/libexec/steamify-gdm-relogin"
+        if os.access(helper, os.X_OK) and subprocess.run(["sudo", "-n", helper], capture_output=True).returncode == 0:
+            return
+        QProcess.startDetached("gnome-session-quit", ["--logout", "--no-prompt"])
+
     def shutdown(self):
         if self._proc and self._proc.state() != QProcess.NotRunning:
             self._proc.kill()