function install_display_output

Displays themed installer output and ends the page request.

Installation tasks should use #title to set the desired page title, but otherwise this function takes care of theming the overall page output during every step of the installation.

Parameters

$output: The content to display on the main part of the page.

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

File

core/includes/install.core.inc, line 1017

Code

function install_display_output($output, $install_state) {
    // Ensure the maintenance theme is initialized.
    // The regular initialization call in install_begin_request() may not be
    // reached in case of an early installer error.
    drupal_maintenance_theme();
    // Prevent install.php from being indexed when installed in a sub folder.
    // robots.txt rules are not read if the site is within domain.com/subfolder
    // resulting in /subfolder/install.php being found through search engines.
    // When settings.php is writable this can be used via an external database
    // leading a malicious user to gain php access to the server.
    $noindex_meta_tag = [
        '#tag' => 'meta',
        '#attributes' => [
            'name' => 'robots',
            'content' => 'noindex, nofollow',
        ],
    ];
    $output['#attached']['html_head'][] = [
        $noindex_meta_tag,
        'install_meta_robots',
    ];
    // Only show the task list if there is an active task; otherwise, the page
    // request has ended before tasks have even been started, so there is nothing
    // meaningful to show.
    $regions = [];
    if (isset($install_state['active_task'])) {
        // Let the theming function know when every step of the installation has
        // been completed.
        $active_task = $install_state['installation_finished'] ? NULL : $install_state['active_task'];
        $task_list = [
            '#theme' => 'maintenance_task_list',
            '#items' => install_tasks_to_display($install_state),
            '#active' => $active_task,
        ];
        $regions['sidebar_first'] = $task_list;
    }
    $bare_html_page_renderer = \Drupal::service('bare_html_page_renderer');
    $response = $bare_html_page_renderer->renderBarePage($output, $output['#title'], 'install_page', $regions);
    $default_headers = [
        'Expires' => 'Sun, 19 Nov 1978 05:00:00 GMT',
        'Last-Modified' => gmdate(DATE_RFC1123, REQUEST_TIME),
        'Cache-Control' => 'no-cache, must-revalidate',
        'ETag' => '"' . REQUEST_TIME . '"',
    ];
    $response->headers
        ->add($default_headers);
    $response->send();
    exit;
}