List web updates as unavailable if the updater container isn't running.

frontend/vue/components/Admin/Updates.vue

@@ -159,6 +159,7 @@ import {useNotify} from "~/functions/useNotify";
 import {useAxios} from "~/vendor/axios";
 import {useSweetAlert} from "~/vendor/sweetalert";
 import CardPage from "~/components/Common/CardPage.vue";
+import {getApiUrl} from "~/router";
 
 const props = defineProps({
     releaseChannel: {
@@ -171,16 +172,14 @@ const props = defineProps({
             return {};
         }
     },
-    updatesApiUrl: {
-        type: String,
-        required: true
-    },
     enableWebUpdates: {
         type: Boolean,
         required: true
     }
 });
 
+const updatesApiUrl = getApiUrl('/admin/updates');
+
 const updateInfo = ref(props.initialUpdateInfo);
 
 const {$gettext} = useTranslate();
@@ -204,7 +203,7 @@ const {axios} = useAxios();
 
 const checkForUpdates = () => {
     wrapWithLoading(
-        axios.get(props.updatesApiUrl)
+        axios.get(updatesApiUrl.value)
     ).then((resp) => {
         updateInfo.value = resp.data;
     });

src/Controller/Api/Admin/Vue/UpdatesAction.php

@@ -9,6 +9,7 @@ use App\Container\SettingsAwareTrait;
 use App\Controller\SingleActionInterface;
 use App\Http\Response;
 use App\Http\ServerRequest;
+use App\Service\WebUpdater;
 use App\Version;
 use Psr\Http\Message\ResponseInterface;
 
@@ -18,7 +19,8 @@ final class UpdatesAction implements SingleActionInterface
     use SettingsAwareTrait;
 
     public function __construct(
-        private readonly Version $version
+        private readonly Version $version,
+        private readonly WebUpdater $webUpdater,
     ) {
     }
 
@@ -31,11 +33,16 @@ final class UpdatesAction implements SingleActionInterface
 
         $router = $request->getRouter();
 
+        $enableWebUpdates = $this->environment->enableWebUpdater();
+        if ($enableWebUpdates && !$this->webUpdater->ping()) {
+            $enableWebUpdates = false;
+        }
+
         return $response->withJson([
             'releaseChannel' => $this->version->getReleaseChannelEnum()->value,
             'initialUpdateInfo' => $settings->getUpdateResults(),
             'updatesApiUrl' => $router->named('api:admin:updates'),
-            'enableWebUpdates' => $this->environment->enableWebUpdater(),
+            'enableWebUpdates' => $enableWebUpdates,
         ]);
     }
 }

src/Service/WebUpdater.php

@@ -6,6 +6,7 @@ namespace App\Service;
 
 use App\Container\EnvironmentAwareTrait;
 use RuntimeException;
+use Throwable;
 
 final class WebUpdater
 {
@@ -24,6 +25,28 @@ final class WebUpdater
         return $this->environment->enableWebUpdater();
     }
 
+    public function ping(): bool
+    {
+        if (!$this->isSupported()) {
+            return false;
+        }
+
+        try {
+            $client = $this->guzzleFactory->buildClient();
+            $client->get(
+                'http://updater:8080/',
+                [
+                    'http_errors' => false,
+                    'timeout' => 5,
+                ]
+            );
+
+            return true;
+        } catch (Throwable) {
+            return false;
+        }
+    }
+
     public function triggerUpdate(): void
     {
         if (!$this->isSupported()) {