TYPO3 Core

I tried to push the code to Gerrit, but without success.
Here's a simple solution to put this in place.

    /**
     * Checks if an update class file exists.
     * Does not check if some update is needed.
     *
     * @param string $extensionKey Extension key
     * @return bool True, if there is some update script
     * @throws \TYPO3\CMS\Extensionmanager\Exception\ExtensionManagerException
     */
    public function checkUpdateScriptExists($extensionKey) {
        $updateScriptCanBeCalled = FALSE;
        $updateScript = $this->getUpdateFileLocation($extensionKey);
        if (file_exists($updateScript)) {
            // get script contents
            $scriptSourceCode = GeneralUtility::getUrl($updateScript);
            // check if it has a namespace
            if (!preg_match('/<\?php.*namespace\s+([^;]+);.*class/is', $scriptSourceCode, $matches)) {
                // if no, rename the class with a unique name
                $className = uniqid('ext_update');
                $scriptSourceCode = preg_replace('/^\s*class\s+ext_update\s+/m', 'class ' . $className . ' ', $scriptSourceCode);
                // load class and call access function
                if (!preg_match('/\?>$/is', $scriptSourceCode)) {
                    $scriptSourceCode .= '?>';
                }

                $classFilename = \TYPO3\CMS\Core\Utility\GeneralUtility::tempnam($extensionKey.'_', '.php');
                $written = \TYPO3\CMS\Core\Utility\GeneralUtility::writeFileToTypo3tempDir($classFilename, $scriptSourceCode);
                if ($written !== NULL){
                    throw new \TYPO3\CMS\Extensionmanager\Exception\ExtensionManagerException(
                        sprintf('Unable to rewrite class.ext_update.php: ' . $written, $extensionKey),
                        1430571633
                    );
                }
                include_once($classFilename);
                unlink($classFilename);
            } else {
                $className = $matches[1] . '\ext_update';
                include_once($updateScript);
            }
            if (!class_exists($className)) {
                throw new \TYPO3\CMS\Extensionmanager\Exception\ExtensionManagerException(
                    sprintf('class.ext_update.php of extension "%s" did not declare ext_update class', $extensionKey),
                    1428176468
                );
            }
            $updater = GeneralUtility::makeInstance($className);
            $updateScriptCanBeCalled = $updater->access();
        }
        return $updateScriptCanBeCalled;
    }

This solution could be improved by using the TYPO3 cache to remember the generated classes and therefore do not have to regenerate every time.

We are currently discussing what to do with this issue. Stay tuned for more infomration soon

Please test the patch and vote. Thanks

Patch set 1 for branch TYPO3_6-2 of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at http://review.typo3.org/39478