InitUpdateWizard.php

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<?php
namespace TYPO3\CMS\Install\Updates;

class InitUpdateWizard extends AbstractUpdate {

    protected $title = 'Initialize database tables for the File Abstraction Layer (FAL)';

    protected $installerSql;

    public function __construct() {
        $this->installerSql = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance('TYPO3\\CMS\\Install\\Service\\SqlSchemaMigrationService');
    }

    public function checkForUpdate(&$description) {
        $description = 'Create the database tables which are required for the File Abstraction Layer in order to work. Do this as the first step for all further wizards related to FAL.';
        return count($this->getRequiredUpdates()) > 0;
    }

    public function performUpdate(array &$dbQueries, &$customMessages) {
        $updates = $this->getRequiredUpdates();
        foreach ($updates as $update) {
            $GLOBALS['TYPO3_DB']->admin_query($update);
            $dbQueries[] = $update;
        }
        return TRUE;
    }

    protected function getRequiredUpdates() {
        $requiredUpdates = array();
        $fileContent = \TYPO3\CMS\Core\Utility\GeneralUtility::getUrl(
            \TYPO3\CMS\Core\Utility\ExtensionManagementUtility::extPath('core'). 'ext_tables.sql'
        );
        $FDfile = $this->installerSql->getFieldDefinitions_fileContent($fileContent);
        $FDdb = $this->installerSql->getFieldDefinitions_database(TYPO3_db);
        $diff = $this->installerSql->getDatabaseExtra($FDfile, $FDdb);
        $update_statements = $this->installerSql->getUpdateSuggestions($diff);
        foreach ((array) $update_statements['create_table'] as $string) {
            if (preg_match('/^CREATE TABLE sys_file($|_)?/', $string)) {
                $requiredUpdates[] = $string;
            }
        }
        return $requiredUpdates;
    }

}