Use DBus API to check for final release

Live images don't have a /.bootstamp file.

Rather than working arround this use the newly added
DBus API in the Anaconda backend.

ui/webui/src/apis/runtime.js

@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2023 Red Hat, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with This program; If not, see <http://www.gnu.org/licenses/>.
+ */
+
+import cockpit from "cockpit";
+
+export class RuntimeClient {
+    constructor (address) {
+        if (RuntimeClient.instance && (!address || RuntimeClient.instance.address === address)) {
+            return RuntimeClient.instance;
+        }
+
+        RuntimeClient.instance?.client.close();
+
+        RuntimeClient.instance = this;
+
+        this.client = cockpit.dbus(
+            "org.fedoraproject.Anaconda.Modules.Runtime",
+            { superuser: "try", bus: "none", address }
+        );
+        this.address = address;
+    }
+
+    init () {
+        this.client.addEventListener(
+            "close", () => console.error("Runtime client closed")
+        );
+    }
+}
+
+/**
+ *
+ * @returns {Promise}           Reports if the given OS release is considered final
+ */
+export const getIsFinal = () => {
+    return (
+        new RuntimeClient().client.call(
+            "/org/fedoraproject/Anaconda/Modules/Runtime/UserInterface",
+            "org.freedesktop.DBus.Properties",
+            "Get",
+            [
+                "org.fedoraproject.Anaconda.Modules.Runtime.UserInterface",
+                "IsFinal",
+            ]
+        )
+                .then(res => res[0].v)
+    );
+};

ui/webui/src/components/app.jsx

@@ -36,8 +36,8 @@ import { BossClient } from "../apis/boss.js";
 import { LocalizationClient, initDataLocalization, startEventMonitorLocalization } from "../apis/localization.js";
 import { StorageClient, initDataStorage, startEventMonitorStorage } from "../apis/storage.js";
 import { PayloadsClient } from "../apis/payloads";
+import { RuntimeClient, getIsFinal } from "../apis/runtime";
 
-import { readBuildstamp, getIsFinal } from "../helpers/betanag.js";
 import { readConf } from "../helpers/conf.js";
 import { useReducerWithThunk, reducer, initialState } from "../reducer.js";
 
@@ -61,6 +61,7 @@ export const Application = () => {
                 new LocalizationClient(address),
                 new StorageClient(address),
                 new PayloadsClient(address),
+                new RuntimeClient(address),
                 new BossClient(address)
             ];
             clients.forEach(c => c.init());
@@ -77,18 +78,19 @@ export const Application = () => {
                         startEventMonitorStorage({ dispatch });
                         startEventMonitorLocalization({ dispatch });
                     }, setCriticalError);
+
+            getIsFinal().then(
+                isFinal => setBeta(!isFinal),
+                setCriticalError
+            );
+
         });
 
         readConf().then(
             setConf,
             setCriticalError
         );
 
-        readBuildstamp().then(
-            buildstamp => setBeta(!getIsFinal(buildstamp)),
-            setCriticalError
-        );
-
         readOsRelease().then(osRelease => setPrettyName(osRelease.PRETTY_NAME));
     }, [dispatch]);