EnvironmentAndFolders.php

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<?php
namespace TYPO3\CMS\Install\Controller\Action\Step;

class EnvironmentAndFolders extends AbstractStepAction {

    public function execute() {
        $folderStructureFactory = $this->objectManager->get('TYPO3\\CMS\\Install\\FolderStructure\\DefaultFactory');
        $structureFacade = $folderStructureFactory->getStructure();
        $structureFixMessages = $structureFacade->fix();
        $statusUtility = $this->objectManager->get('TYPO3\\CMS\\Install\\Status\\StatusUtility');
        $errorsFromStructure = $statusUtility->filterBySeverity($structureFixMessages, 'error');

        if (@is_dir(PATH_typo3conf)) {
            $configurationManager = $this->objectManager->get('TYPO3\\CMS\\Core\\Configuration\\ConfigurationManager');
            $configurationManager->createLocalConfigurationFromFactoryConfiguration();

            // Create a PackageStates.php with all packages activated marked as "part of factory default"
            if (!file_exists(PATH_typo3conf . 'PackageStates.php')) {
                $packageManager = \TYPO3\CMS\Core\Core\Bootstrap::getInstance()->getEarlyInstance('TYPO3\\Flow\\Package\\PackageManager');
                $packages = $packageManager->getAvailablePackages();
                foreach ($packages as $package) {
                    if ($package instanceof \TYPO3\CMS\Core\Package\PackageInterface
                        && $package->isPartOfFactoryDefault()
                    ) {
                        $packageManager->activatePackage($package->getPackageKey());
                    }
                }
                $packageManager->forceSortAndSavePackageStates();
            }

            // Create enable install tool file after typo3conf & LocalConfiguration were created
            $installToolService = $this->objectManager->get('TYPO3\\CMS\\Install\\Service\\EnableFileService');
            $installToolService->removeFirstInstallFile();
            $installToolService->createInstallToolEnableFile();
        }

        return $errorsFromStructure;
    }

    public function needsExecution() {
        if (@is_file(PATH_typo3conf . 'LocalConfiguration.php')) {
            return FALSE;
        } else {
            return TRUE;
        }
    }

    protected function executeAction() {
        $statusCheck = $this->objectManager->get('TYPO3\\CMS\\Install\\SystemEnvironment\\Check');
        $statusObjects = $statusCheck->getStatus();
        $statusUtility = $this->objectManager->get('TYPO3\\CMS\\Install\\Status\\StatusUtility');
        $environmentStatus = $statusUtility->sortBySeverity($statusObjects);
        $alerts = $statusUtility->filterBySeverity($statusObjects, 'alert');
        $this->view->assign('alerts', $alerts);
        $this->view->assign('environmentStatus', $environmentStatus);

        $folderStructureFactory = $this->objectManager->get('TYPO3\\CMS\\Install\\FolderStructure\\DefaultFactory');
        $structureFacade = $folderStructureFactory->getStructure();
        $structureMessages = $structureFacade->getStatus();
        $structureErrors = $statusUtility->filterBySeverity($structureMessages, 'error');
        $this->view->assign('structureErrors', $structureErrors);

        if (count($environmentStatus['error']) > 0
            || count($environmentStatus['warning']) > 0
            || count($structureErrors) > 0
        ) {
            $this->view->assign('errorsOrWarningsFromStatus', TRUE);
        }
        $this->assignSteps();

        return $this->view->render(!empty($alerts));
    }
}