Check installation requirements and report any errors.

File

drupal-6.x/install.php, line 902

Code

function install_check_requirements($profile, $verify) {

  // If Drupal is not set up already, we need to create a settings file.
  if (!$verify) {
    $writable = FALSE;
    $conf_path = './' . conf_path(FALSE, TRUE);
    $settings_file = $conf_path . '/settings.php';
    $file = $conf_path;
    $exists = FALSE;
    // Verify that the directory exists.
    if (drupal_verify_install_file($conf_path, FILE_EXIST, 'dir')) {
      // Check to make sure a settings.php already exists.
      $file = $settings_file;
      if (drupal_verify_install_file($settings_file, FILE_EXIST)) {
        $exists = TRUE;
        // If it does, make sure it is writable.
        $writable = drupal_verify_install_file($settings_file, FILE_READABLE | FILE_WRITABLE);
      }
    }
    if (!$exists) {
      drupal_set_message(st('The @drupal installer requires that you create a settings file as part of the installation process.
<ol>
<li>Copy the %default_file file to %file.</li>
<li>Change file permissions so that it is writable by the web server. If you are unsure how to grant file permissions, please consult the <a href="@handbook_url">on-line handbook</a>.</li>
</ol>
More details about installing Drupal are available in INSTALL.txt.', array('@drupal' => drupal_install_profile_name(), '%file' => $file, '%default_file' => $conf_path . '/default.settings.php', '@handbook_url' => 'http://drupal.org/server-permissions')), 'error');
    }
    elseif (!$writable) {
      drupal_set_message(st('The @drupal installer requires write permissions to %file during the installation process. If you are unsure how to grant file permissions, please consult the <a href="@handbook_url">on-line handbook</a>.', array('@drupal' => drupal_install_profile_name(), '%file' => $file, '@handbook_url' => 'http://drupal.org/server-permissions')), 'error');
    }
  }

  // Check the other requirements.
  $requirements = drupal_check_profile($profile);
  $severity = drupal_requirements_severity($requirements);

  // If there are issues, report them.
  if ($severity == REQUIREMENT_ERROR) {

    foreach ($requirements as $requirement) {
      if (isset($requirement['severity']) && $requirement['severity'] == REQUIREMENT_ERROR) {
        $message = $requirement['description'];
        if (isset($requirement['value']) && $requirement['value']) {
          $message .= ' (' . st('Currently using !item !version', array('!item' => $requirement['title'], '!version' => $requirement['value'])) . ')';
        }
        drupal_set_message($message, 'error');
      }
    }
  }
  if ($severity == REQUIREMENT_WARNING) {

    foreach ($requirements as $requirement) {
      if (isset($requirement['severity']) && $requirement['severity'] == REQUIREMENT_WARNING) {
        $message = $requirement['description'];
        if (isset($requirement['value']) && $requirement['value']) {
          $message .= ' (' . st('Currently using !item !version', array('!item' => $requirement['title'], '!version' => $requirement['value'])) . ')';
        }
        drupal_set_message($message, 'warning');
      }
    }
  }
}