Issue #3120910 by catch, longwave, tedbow, Pascal-, alexpott, Punyasloka:...

  }

  if (!$versions) {

    $versions = \Drupal::keyValue('system.schema')->getAll();

    $enabled_modules = \Drupal::moduleHandler()->getModuleList();

    $enabled_modules = array_fill_keys(array_keys($enabled_modules), \Drupal::CORE_MINIMUM_SCHEMA_VERSION);

    $versions = array_merge($enabled_modules, $versions);

    if (!$versions = \Drupal::keyValue('system.schema')->getAll()) {

      $versions = [];

    }

  }

  if ($array) {

 * Checks update requirements and reports errors and (optionally) warnings.

 */

function update_check_requirements() {

  // Because this is one of the earliest points in the update process,

  // detect and fix missing schema versions for modules here to ensure

  // it runs on all update code paths.

  _update_fix_missing_schema();

  // Check requirements of all loaded modules.

  $requirements = \Drupal::moduleHandler()->invokeAll('requirements', ['update']);

  $requirements += update_system_schema_requirements();

  return $requirements;

}

/**

 * Helper to detect and fix 'missing' schema information.

 *

 * Repairs the case where a module has no schema version recorded.

 * This has to be done prior to updates being run, otherwise the update

 * system would detect and attempt to run all historical updates for a

 * module.

 *

 * @todo: remove in a major version after

 * https://www.drupal.org/project/drupal/issues/3130037 has been fixed.

 */

function _update_fix_missing_schema() {

  $versions = \Drupal::keyValue('system.schema')->getAll();

  $module_handler = \Drupal::moduleHandler();

  $enabled_modules = $module_handler->getModuleList();

  foreach (array_keys($enabled_modules) as $module) {

    // All modules should have a recorded schema version, but when they

    // don't, detect and fix the problem.

    if (!isset($versions[$module])) {

      // Ensure the .install file is loaded.

      module_load_install($module);

      $all_updates = drupal_get_schema_versions($module);

      // If the schema version of a module hasn't been recorded, we cannot

      // know the actual schema version a module is at, because

      // no updates will ever have been run on the site and it was not set

      // correctly when the module was installed, so instead set it to

      // the same as the last update. This means that updates will proceed

      // again the next time the module is updated and a new update is

      // added. Updates added in between the module being installed and the

      // schema version being fixed here (if any have been added) will never

      // be run, but we have no way to identify which updates these are.

      if ($all_updates) {

        $last_update = max($all_updates);

      }

      else {

        $last_update = \Drupal::CORE_MINIMUM_SCHEMA_VERSION;

      }

      // If the module implements hook_update_last_removed() use the

      // value of that if it's higher than the schema versions found so

      // far.

      if ($last_removed = $module_handler->invoke($module, 'update_last_removed')) {

        $last_update = max($last_update, $last_removed);

      }

      drupal_set_installed_schema_version($module, $last_update);

      $args = ['%module' => $module, '%last_update_hook' => $module . '_update_' . $last_update . '()'];

      \Drupal::messenger()->addWarning(t('Schema information for module %module was missing from the database. You should manually review the module updates and your database to check if any updates have been skipped up to, and including, %last_update_hook.', $args));

      \Drupal::logger('update')->warning('Schema information for module %module was missing from the database. You should manually review the module updates and your database to check if any updates have been skipped up to, and including, %last_update_hook.', $args);

    }

  }

}

/**

 * Forces a module to a given schema version.

 *

  $return = [];

  // Get a list of installed modules, arranged so that we invoke their hooks in

  // the same order that \Drupal::moduleHandler()->invokeAll() does.

  foreach (drupal_get_installed_schema_version(NULL, FALSE, TRUE) as $module => $schema) {

  foreach (\Drupal::keyValue('system.schema')->getAll() as $module => $schema) {

    if ($schema == SCHEMA_UNINSTALLED) {

      // Nothing to upgrade.

      continue;

namespace Drupal\Tests\system\Functional\UpdateSystem;

use Drupal\Core\Database\Database;

use Drupal\Core\Url;

use Drupal\Tests\BrowserTestBase;

use Drupal\Tests\UpdatePathTestTrait;

use Drupal\Tests\RequirementsPageTrait;

/**

 * Tries to update a module which has no pre-existing schema.

 * @group legacy

 */

class NoPreExistingSchemaUpdateTest extends BrowserTestBase {

  use UpdatePathTestTrait;

  use RequirementsPageTrait;

  /**

   * {@inheritdoc}

    $this->assertArrayNotHasKey('update_test_no_preexisting', $schema);

    $this->assertFalse(\Drupal::state()->get('update_test_no_preexisting_update_8001', FALSE));

    $this->runUpdates();

    $update_url = Url::fromRoute('system.db_update');

    require_once $this->root . '/core/includes/update.inc';

    // The site might be broken at the time so logging in using the UI might

    // not work, so we use the API itself.

    $this->writeSettings([

      'settings' => [

        'update_free_access' => (object) [

          'value' => TRUE,

          'required' => TRUE,

        ],

      ],

    ]);

    $this->drupalGet($update_url);

    $this->updateRequirementsProblem();

    $schema = \Drupal::keyValue('system.schema')->getAll();

    $this->assertArrayHasKey('update_test_no_preexisting', $schema);

    $this->assertEquals('8001', $schema['update_test_no_preexisting']);

    $this->assertTrue(\Drupal::state()->get('update_test_no_preexisting_update_8001', FALSE));

    // The schema version has been fixed, but the update was never run.

    $this->assertFalse(\Drupal::state()->get('update_test_no_preexisting_update_8001', FALSE));

    $this->assertSession()->pageTextContains('Schema information for module update_test_no_preexisting was missing from the database. You should manually review the module updates and your database to check if any updates have been skipped up to, and including, update_test_no_preexisting_update_8001().');

  }

}