Issue #3377237: For now, disallow unattended updates on Windows machines

src/Validator/WindowsValidator.php

@@ -49,22 +49,26 @@ final class WindowsValidator implements EventSubscriberInterface {
    *   The event being handled.
    */
   public function validate(PreOperationStageEvent $event): void {
-    $stage = $event->stage;
-    if ($stage instanceof CronUpdateStage && $stage->getMode() !== CronUpdateStage::DISABLED) {
-      $method = $this->configFactory->get('automatic_updates.settings')
-        ->get('unattended.method');
+    // If we're not on Windows, there's nothing for us to validate.
+    if ($this->host::isWindows() === FALSE) {
+      return;
+    }
 
-      if ($method === 'web' && $this->host::isWindows()) {
-        $message = $this->t('Unattended updates are not supported on Windows.');
+    $method = $this->configFactory->get('automatic_updates.settings')
+      ->get('unattended.method');
+
+    $stage = $event->stage;
+    if ($stage instanceof CronUpdateStage && $stage->getMode() !== CronUpdateStage::DISABLED && $method === 'web') {
+      $message = $this->t('Unattended updates are not supported on Windows.');
 
-        $form_url = Url::fromRoute('update.report_update');
-        if ($form_url->access()) {
-          $message = $this->t('@message Use <a href=":form-url">the update form</a> to update Drupal core.', [
-            ':form-url' => $form_url->toString(),
-          ]);
-        }
-        $event->addError([$message]);
+      $form_url = Url::fromRoute('update.report_update');
+      if ($form_url->access()) {
+        $message = $this->t('@message Use <a href=":form-url">the update form</a> to update Drupal core.', [
+          '@message' => $message,
+          ':form-url' => $form_url->toString(),
+        ]);
       }
+      $event->addError([$message]);
     }
   }