install_display_requirements

install_display_requirements($install_state, $requirements)

function install_display_requirements($install_state, $requirements) {
  // Check the severity of the requirements reported.
  $severity = drupal_requirements_severity($requirements);

  // If there are errors, always display them. If there are only warnings, skip
  // them if the user has provided a URL parameter acknowledging the warnings
  // and indicating a desire to continue anyway. See drupal_requirements_url().
  if ($severity == REQUIREMENT_ERROR || ($severity == REQUIREMENT_WARNING && empty($install_state['parameters']['continue']))) {
    if ($install_state['interactive']) {
      $build['report']['#theme'] = 'status_report';
      $build['report']['#requirements'] = $requirements;
      if ($severity == REQUIREMENT_WARNING) {
        $build['#title'] = t('Requirements review');
        $build['#suffix'] = t('Check the messages and <a href=":retry">retry</a>, or you may choose to <a href=":cont">continue anyway</a>.', array(':retry' => drupal_requirements_url(REQUIREMENT_ERROR), ':cont' => drupal_requirements_url($severity)));
      }
      else {
        $build['#title'] = t('Requirements problem');
        $build['#suffix'] = t('Check the messages and <a href=":url">try again</a>.', array(':url' => drupal_requirements_url($severity)));
      }
      return $build;
    }
    else {
      // Throw an exception showing any unmet requirements.
      $failures = array();
      foreach ($requirements as $requirement) {
        // Skip warnings altogether for non-interactive installations; these
        // proceed in a single request so there is no good opportunity (and no
        // good method) to warn the user anyway.
        if (isset($requirement['severity']) && $requirement['severity'] == REQUIREMENT_ERROR) {
          $failures[] = $requirement['title'] . ': ' . $requirement['value'] . "\n\n" . $requirement['description'];
        }
      }
      if (!empty($failures)) {
        throw new InstallerException(implode("\n\n", $failures));
      }
    }
  }
}