function install_display_requirements in Drupal 8

Same name and namespace in other branches

1. 9 core/includes/install.core.inc \install_display_requirements()
2. 10 core/includes/install.core.inc \install_display_requirements()

Displays installation requirements.

Parameters

array $install_state: An array of information about the current installation state.

array $requirements: An array of requirements, in the same format as is returned by hook_requirements().

Return value

A themed status report, or an exception if there are requirement errors. If there are only requirement warnings, a themed status report is shown initially, but the user is allowed to bypass it by providing 'continue=1' in the URL. Otherwise, no output is returned, so that the next task can be run in the same page request.

Throws

\Drupal\Core\Installer\Exception\InstallerException

2 calls to install_display_requirements()

install_download_translation in core/includes/install.core.inc

Download a translation file for the selected language.

install_verify_requirements in core/includes/install.core.inc

Verifies the requirements for installing Drupal.

File

core/includes/install.core.inc, line 2267

API functions for installing Drupal.

Code

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']['#type'] = 'status_report';
      $build['report']['#requirements'] = $requirements;
      if ($severity == REQUIREMENT_WARNING) {
        $build['#title'] = t('Requirements review');
        $build['#suffix'] = t('Check the messages and <a href=":retry">retry</a>, or you may choose to <a href=":cont">continue anyway</a>.', [
          ':retry' => drupal_requirements_url(REQUIREMENT_ERROR),
          ':cont' => drupal_requirements_url($severity),
        ]);
      }
      else {
        $build['#title'] = t('Requirements problem');
        $build['#suffix'] = t('Check the messages and <a href=":url">try again</a>.', [
          ':url' => drupal_requirements_url($severity),
        ]);
      }
      return $build;
    }
    else {

      // Throw an exception showing any unmet requirements.
      $failures = [];
      foreach ($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));
      }
    }
  }
}