function update_results_page()
{
    drupal_set_title('Drupal database update');
    $links = update_helpful_links();
    update_task_list();
    // Report end result
    if (module_exists('dblog')) {
        $log_message = ' All errors have been <a href="' . base_path() . '?q=admin/reports/dblog">logged</a>.';
    } else {
        $log_message = ' All errors have been logged.';
    }
    if ($_SESSION['update_success']) {
        $output = '<p>Updates were attempted. If you see no failures below, you may proceed happily to the <a href="' . base_path() . '?q=admin">administration pages</a>. Otherwise, you may need to update your database manually.' . $log_message . '</p>';
    } else {
        list($module, $version) = array_pop(reset($_SESSION['updates_remaining']));
        $output = '<p class="error">The update process was aborted prematurely while running <strong>update #' . $version . ' in ' . $module . '.module</strong>.' . $log_message;
        if (module_exists('dblog')) {
            $output .= ' You may need to check the <code>watchdog</code> database table manually.';
        }
        $output .= '</p>';
    }
    if (!empty($GLOBALS['update_free_access'])) {
        $output .= "<p><strong>Reminder: don't forget to set the <code>\$update_free_access</code> value in your <code>settings.php</code> file back to <code>FALSE</code>.</strong></p>";
    }
    $output .= theme('item_list', array('items' => $links));
    // Output a list of queries executed
    if (!empty($_SESSION['update_results'])) {
        $output .= '<div id="update-results">';
        $output .= '<h2>The following updates returned messages</h2>';
        foreach ($_SESSION['update_results'] as $module => $updates) {
            $output .= '<h3>' . $module . ' module</h3>';
            foreach ($updates as $number => $queries) {
                if ($number != '#abort') {
                    $messages = array();
                    foreach ($queries as $query) {
                        // If there is no message for this update, don't show anything.
                        if (empty($query['query'])) {
                            continue;
                        }
                        if ($query['success']) {
                            $messages[] = '<li class="success">' . $query['query'] . '</li>';
                        } else {
                            $messages[] = '<li class="failure"><strong>Failed:</strong> ' . $query['query'] . '</li>';
                        }
                    }
                    if ($messages) {
                        $output .= '<h4>Update #' . $number . "</h4>\n";
                        $output .= '<ul>' . implode("\n", $messages) . "</ul>\n";
                    }
                }
                $output .= '</ul>';
            }
        }
        $output .= '</div>';
    }
    unset($_SESSION['update_results']);
    unset($_SESSION['update_success']);
    return $output;
}

 /**
  * {@inheritdoc}
  */
 public function buildForm(array $form, array &$form_state)
 {
     $count = 0;
     $incompatible_count = 0;
     $form['start'] = array('#tree' => TRUE, '#type' => 'details');
     // Ensure system.module's updates appear first.
     $form['start']['system'] = array();
     $updates = update_get_update_list();
     $starting_updates = array();
     $incompatible_updates_exist = FALSE;
     foreach ($updates as $module => $update) {
         if (!isset($update['start'])) {
             $form['start'][$module] = array('#type' => 'item', '#title' => $module . ' module', '#markup' => $update['warning'], '#prefix' => '<div class="messages messages--warning">', '#suffix' => '</div>');
             $incompatible_updates_exist = TRUE;
             continue;
         }
         if (!empty($update['pending'])) {
             $starting_updates[$module] = $update['start'];
             $form['start'][$module] = array('#type' => 'hidden', '#value' => $update['start']);
             $form['start'][$module . '_updates'] = array('#theme' => 'item_list', '#items' => $update['pending'], '#title' => $module . ' module');
         }
         if (isset($update['pending'])) {
             $count = $count + count($update['pending']);
         }
     }
     // Find and label any incompatible updates.
     foreach (update_resolve_dependencies($starting_updates) as $data) {
         if (!$data['allowed']) {
             $incompatible_updates_exist = TRUE;
             $incompatible_count++;
             $module_update_key = $data['module'] . '_updates';
             if (isset($form['start'][$module_update_key]['#items'][$data['number']])) {
                 $text = $data['missing_dependencies'] ? 'This update will been skipped due to the following missing dependencies: <em>' . implode(', ', $data['missing_dependencies']) . '</em>' : "This update will be skipped due to an error in the module's code.";
                 $form['start'][$module_update_key]['#items'][$data['number']] .= '<div class="warning">' . $text . '</div>';
             }
             // Move the module containing this update to the top of the list.
             $form['start'] = array($module_update_key => $form['start'][$module_update_key]) + $form['start'];
         }
     }
     // Warn the user if any updates were incompatible.
     if ($incompatible_updates_exist) {
         drupal_set_message('Some of the pending updates cannot be applied because their dependencies were not met.', 'warning');
     }
     if (empty($count)) {
         drupal_set_message(t('No pending updates.'));
         unset($form);
         $form['links'] = array('#theme' => 'links', '#links' => update_helpful_links());
         // No updates to run, so caches won't get flushed later.  Clear them now.
         update_flush_all_caches();
     } else {
         $form['help'] = array('#markup' => '<p>The version of Drupal you are updating from has been automatically detected.</p>', '#weight' => -5);
         if ($incompatible_count) {
             $form['start']['#title'] = format_plural($count, '1 pending update (@number_applied to be applied, @number_incompatible skipped)', '@count pending updates (@number_applied to be applied, @number_incompatible skipped)', array('@number_applied' => $count - $incompatible_count, '@number_incompatible' => $incompatible_count));
         } else {
             $form['start']['#title'] = format_plural($count, '1 pending update', '@count pending updates');
         }
         $form['actions'] = array('#type' => 'actions');
         $form['actions']['submit'] = array('#type' => 'submit', '#value' => 'Apply pending updates', '#button_type' => 'primary');
     }
     return $form;
 }

/**
 * Displays results of the update script with any accompanying errors.
 */
function update_results_page()
{
    // Report end result.
    if (\Drupal::moduleHandler()->moduleExists('dblog') && \Drupal::currentUser()->hasPermission('access site reports')) {
        $log_message = ' All errors have been <a href="' . base_path() . '?q=admin/reports/dblog">logged</a>.';
    } else {
        $log_message = ' All errors have been logged.';
    }
    if ($_SESSION['update_success']) {
        $output = '<p>Updates were attempted. If you see no failures below, you may proceed happily back to your <a href="' . base_path() . '">site</a>. Otherwise, you may need to update your database manually.' . $log_message . '</p>';
    } else {
        $last = reset($_SESSION['updates_remaining']);
        list($module, $version) = array_pop($last);
        $output = '<p class="error">The update process was aborted prematurely while running <strong>update #' . $version . ' in ' . $module . '.module</strong>.' . $log_message;
        if (\Drupal::moduleHandler()->moduleExists('dblog')) {
            $output .= ' You may need to check the <code>watchdog</code> database table manually.';
        }
        $output .= '</p>';
    }
    if (Settings::get('update_free_access')) {
        $output .= "<p><strong>Reminder: don't forget to set the <code>\$settings['update_free_access']</code> value in your <code>settings.php</code> file back to <code>FALSE</code>.</strong></p>";
    }
    $links = array('#theme' => 'links', '#links' => update_helpful_links());
    $output .= drupal_render($links);
    // Output a list of queries executed.
    if (!empty($_SESSION['update_results'])) {
        $all_messages = '';
        foreach ($_SESSION['update_results'] as $module => $updates) {
            if ($module != '#abort') {
                $module_has_message = FALSE;
                $query_messages = '';
                foreach ($updates as $number => $queries) {
                    $messages = array();
                    foreach ($queries as $query) {
                        // If there is no message for this update, don't show anything.
                        if (empty($query['query'])) {
                            continue;
                        }
                        if ($query['success']) {
                            $messages[] = '<li class="success">' . $query['query'] . '</li>';
                        } else {
                            $messages[] = '<li class="failure"><strong>Failed:</strong> ' . $query['query'] . '</li>';
                        }
                    }
                    if ($messages) {
                        $module_has_message = TRUE;
                        $query_messages .= '<h4>Update #' . $number . "</h4>\n";
                        $query_messages .= '<ul>' . implode("\n", $messages) . "</ul>\n";
                    }
                }
                // If there were any messages in the queries then prefix them with the
                // module name and add it to the global message list.
                if ($module_has_message) {
                    $all_messages .= '<h3>' . $module . " module</h3>\n" . $query_messages;
                }
            }
        }
        if ($all_messages) {
            $output .= '<div class="update-results"><h2>The following updates returned messages</h2>';
            $output .= $all_messages;
            $output .= '</div>';
        }
    }
    unset($_SESSION['update_results']);
    unset($_SESSION['update_success']);
    $build = array('#title' => 'Drupal database update', '#markup' => $output);
    return $build;
}