phacility/phabricator · error · PhabricatorFileStorageConfigurationException

Storage engine '%s' returned an improper engine identifier '

Error message

Storage engine '%s' returned an improper engine identifier '{%s}': it must be nonempty and no longer than 32 characters.

What it means

Error "Storage engine '%s' returned an improper engine identifier '{%s}': it must be nonempty and no longer than 32 characters." thrown in phacility/phabricator.

Source

Thrown at src/applications/files/storage/PhabricatorFile.php:569

    $integrity_hash = $engine->newIntegrityHash($formatted_data, $format);

    $data_handle = $engine->writeFile($formatted_data, $params);

    if (!$data_handle || strlen($data_handle) > 255) {
      // This indicates an improperly implemented storage engine.
      throw new PhabricatorFileStorageConfigurationException(
        pht(
          "Storage engine '%s' executed %s but did not return a valid ".
          "handle ('%s') to the data: it must be nonempty and no longer ".
          "than 255 characters.",
          $engine_class,
          'writeFile()',
          $data_handle));
    }

    $engine_identifier = $engine->getEngineIdentifier();
    if (!$engine_identifier || strlen($engine_identifier) > 32) {
      throw new PhabricatorFileStorageConfigurationException(
        pht(
          "Storage engine '%s' returned an improper engine identifier '{%s}': ".
          "it must be nonempty and no longer than 32 characters.",
          $engine_class,
          $engine_identifier));
    }

    return array($engine_identifier, $data_handle, $integrity_hash);
  }


  /**
   * Download a remote resource over HTTP and save the response body as a file.
   *
   * This method respects `security.outbound-blacklist`, and protects against
   * HTTP redirection (by manually following "Location" headers and verifying
   * each destination). It does not protect against DNS rebinding. See
   * discussion in T6755.

View on GitHub (pinned to 5720a38cfe)

When it happens

Trigger: Thrown at src/applications/files/storage/PhabricatorFile.php:569 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of phacility/phabricator@5720a38cfe (2026-08-21). Data as JSON: /api/errors/88cb54744cfa8b13. Report an issue: GitHub.