Issue #3231996: Ensure file system is writeable

src/Validator/WritableFileSystemValidator.php

@@ -9,6 +9,9 @@ use Drupal\automatic_updates\Validation\ValidationResult;
 use Drupal\Core\StringTranslation\StringTranslationTrait;
 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 
+/**
+ * Checks that the file system is writable before updating.
+ */
 class WritableFileSystemValidator implements EventSubscriberInterface {
 
   use StringTranslationTrait;