function system_requirements

Test and report Drupal installation requirements.

File

modules/system/system.install, line 10

Code

function system_requirements($phase) {
  $requirements = array();

  // Ensure translations don't break at install time
  $t = get_t();

  // Report Drupal version
  if ($phase == 'runtime') {
    $requirements['drupal'] = array(
      'title' => $t('Drupal'),
      'value' => VERSION,
      'severity' => REQUIREMENT_INFO,
      'weight' => -10,
    );
  }

  // Web server information.
  $software = $_SERVER['SERVER_SOFTWARE'];
  $requirements['webserver'] = array(
    'title' => $t('Web server'),
    'value' => $software,
  );

  // Test PHP version
  $requirements['php'] = array(
    'title' => $t('PHP'),
    'value' => $phase == 'runtime' ? l(phpversion(), 'admin/logs/status/php') : phpversion(),
  );
  if (version_compare(phpversion(), DRUPAL_MINIMUM_PHP) < 0) {
    $requirements['php']['description'] = $t('Your PHP installation is too old. Drupal requires at least PHP %version.', array(
      '%version' => DRUPAL_MINIMUM_PHP,
    ));
    $requirements['php']['severity'] = REQUIREMENT_ERROR;
  }

  // Test PHP register_globals setting.
  $requirements['php_register_globals'] = array(
    'title' => $t('PHP register globals'),
  );
  $register_globals = trim(ini_get('register_globals'));

  // Unfortunately, ini_get() may return many different values, and we can't
  // be certain which values mean 'on', so we instead check for 'not off'
  // since we never want to tell the user that their site is secure
  // (register_globals off), when it is in fact on. We can only guarantee
  // register_globals is off if the value returned is 'off', '', or 0.
  if (!empty($register_globals) && strtolower($register_globals) != 'off') {
    $requirements['php_register_globals']['description'] = $t('<em>register_globals</em> is enabled. Drupal requires this configuration directive to be disabled. Your site may not be secure when <em>register_globals</em> is enabled. The PHP manual has instructions for <a href="http://php.net/configuration.changes">how to change configuration settings</a>.');
    $requirements['php_register_globals']['severity'] = REQUIREMENT_ERROR;
    $requirements['php_register_globals']['value'] = $t("Enabled ('@value')", array(
      '@value' => $register_globals,
    ));
  }
  else {
    $requirements['php_register_globals']['value'] = $t('Disabled');
  }

  // Test DB version
  global $db_type;
  if (function_exists('db_status_report')) {
    $requirements += db_status_report($phase);
  }

  // Test settings.php file writability
  if ($phase == 'runtime') {
    if (!drupal_verify_install_file(conf_path() . '/settings.php', FILE_EXIST | FILE_READABLE | FILE_NOT_WRITABLE)) {
      $requirements['settings.php'] = array(
        'value' => $t('Not protected'),
        'severity' => REQUIREMENT_ERROR,
        'description' => $t('The file %file is not protected from modifications and poses a security risk. You must change the file\'s permissions to be non-writable.', array(
          '%file' => conf_path() . '/settings.php',
        )),
      );
    }
    else {
      $requirements['settings.php'] = array(
        'value' => $t('Protected'),
      );
    }
    $requirements['settings.php']['title'] = $t('Configuration file');
  }

  // Report cron status
  if ($phase == 'runtime') {
    $cron_last = variable_get('cron_last', NULL);
    if (is_numeric($cron_last)) {
      $requirements['cron']['value'] = $t('Last run !time ago', array(
        '!time' => format_interval(time() - $cron_last),
      ));
    }
    else {
      $requirements['cron'] = array(
        'description' => $t('Cron has not run. It appears cron jobs have not been setup on your system. Please check the help pages for <a href="@url">configuring cron jobs</a>.', array(
          '@url' => 'http://drupal.org/cron',
        )),
        'severity' => REQUIREMENT_ERROR,
        'value' => $t('Never run'),
      );
    }
    $requirements['cron']['description'] .= ' ' . t('You can <a href="@cron">run cron manually</a>.', array(
      '@cron' => url('admin/logs/status/run-cron'),
    ));
    $requirements['cron']['title'] = $t('Cron maintenance tasks');
  }

  // Test files directory
  if ($phase == 'runtime') {
    $directory = file_directory_path();
    $is_writable = is_writable($directory);
    $is_directory = is_dir($directory);
    if (!$is_writable || !$is_directory) {
      if (!$is_directory) {
        $error = $t('The directory %directory does not exist.', array(
          '%directory' => $directory,
        ));
      }
      else {
        $error = $t('The directory %directory is not writable.', array(
          '%directory' => $directory,
        ));
      }
      $requirements['file system'] = array(
        'value' => $t('Not writable'),
        'severity' => REQUIREMENT_ERROR,
        'description' => $error . ' ' . $t('You may need to set the correct directory at the <a href="@admin-file-system">file system settings page</a> or change the current directory\'s permissions so that it is writable.', array(
          '@admin-file-system' => url('admin/settings/file-system'),
        )),
      );
    }
    else {
      if (variable_get('file_downloads', FILE_DOWNLOADS_PUBLIC) == FILE_DOWNLOADS_PUBLIC) {
        $requirements['file system'] = array(
          'value' => $t('Writable (<em>public</em> download method)'),
        );
      }
      else {
        $requirements['file system'] = array(
          'value' => $t('Writable (<em>private</em> download method)'),
        );
      }
    }
    $requirements['file system']['title'] = $t('File system');
  }

  // See if updates are available in update.php.
  if ($phase == 'runtime') {
    $requirements['update'] = array(
      'title' => $t('Database schema'),
      'severity' => REQUIREMENT_OK,
      'value' => $t('Up to date'),
    );

    // Check installed modules.
    foreach (module_list() as $module) {
      $updates = drupal_get_schema_versions($module);
      if ($updates !== FALSE) {
        $default = drupal_get_installed_schema_version($module);
        if (max($updates) > $default) {
          $requirements['update']['severity'] = REQUIREMENT_ERROR;
          $requirements['update']['value'] = $t('Out of date');
          $requirements['update']['description'] = $t('Some modules have database schema updates to install. You should run the <a href="@update">database update script</a> immediately.', array(
            '@update' => base_path() . 'update.php',
          ));
          break;
        }
      }
    }
  }

  // Test Unicode library
  include_once './includes/unicode.inc';
  $requirements = array_merge($requirements, unicode_requirements());
  return $requirements;
}