install_profile_modules

install_profile_modules(&$install_state)

function install_profile_modules(&$install_state) {
  // We need to manually trigger the installation of core-provided entity types,
  // as those will not be handled by the module installer.
  install_core_entity_type_definitions();

  $modules = \Drupal::state()->get('install_profile_modules') ? : array();
  $files = system_rebuild_module_data();
  \Drupal::state()->delete('install_profile_modules');

  // Always install required modules first. Respect the dependencies between
  // the modules.
  $required = array();
  $non_required = array();

  // Add modules that other modules depend on.
  foreach ($modules as $module) {
    if ($files[$module]->requires) {
      $modules = array_merge($modules, array_keys($files[$module]->requires));
    }
  }
  $modules = array_unique($modules);
  foreach ($modules as $module) {
    if (!empty($files[$module]->info['required'])) {
      $required[$module] = $files[$module]->sort;
    }
    else {
      $non_required[$module] = $files[$module]->sort;
    }
  }
  arsort($required);
  arsort($non_required);

  $operations = array();
  foreach ($required + $non_required as $module => $weight) {
    $operations[] = array('_install_module_batch', array($module, $files[$module]->info['name']));
  }
  $batch = array(
    'operations' => $operations,
    'title' => t('Installing @drupal', array('@drupal' => drupal_install_profile_distribution_name())),
    'error_message' => t('The installation has encountered an error.'),
  );
  return $batch;
}