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typo3/sysext/extensionmanager/Classes/Command/ActivateExtensionCommand.php

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+<?php
+declare(strict_types = 1);
+namespace TYPO3\CMS\Extensionmanager\Command;
+
+/*
+ * This file is part of the TYPO3 CMS project.
+ *
+ * It is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License, either version 2
+ * of the License, or any later version.
+ *
+ * For the full copyright and license information, please read the
+ * LICENSE.txt file that was distributed with this source code.
+ *
+ * The TYPO3 project - inspiring people to share!
+ */
+
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+use Symfony\Component\Console\Style\SymfonyStyle;
+use TYPO3\CMS\Core\Core\Bootstrap;
+use TYPO3\CMS\Core\Utility\GeneralUtility;
+use TYPO3\CMS\Extbase\Object\ObjectManager;
+use TYPO3\CMS\Extbase\SignalSlot\Dispatcher;
+use TYPO3\CMS\Extensionmanager\Utility\InstallUtility;
+
+/**
+ * Command for activating an existing extension via CLI.
+ */
+class ActivateExtensionCommand extends Command
+{
+    /**
+     * Defines the allowed options for this command
+     */
+    protected function configure()
+    {
+        $this
+            ->setDescription('Activates an extension by key')
+            ->setHelp('The extension files must be present in one of the recognized extension folder paths in TYPO3.')
+            ->setAliases(['extensionmanager:extension:install', 'extension:install'])
+            ->addArgument(
+                'extensionkey',
+                InputArgument::REQUIRED,
+                'The extension key of a currently deactivated extension, located in one of TYPO3\'s extension paths.'
+            );
+    }
+
+    /**
+     * Installs an extension
+     *
+     * @inheritdoc
+     */
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        $io = new SymfonyStyle($input, $output);
+        $extensionKey = $input->getArgument('extensionkey');
+
+        // Ensure the _cli_ user is authenticated because the extension might import data
+        Bootstrap::initializeBackendAuthentication();
+
+        $objectManager = GeneralUtility::makeInstance(ObjectManager::class);
+        // Emits packages may have changed signal
+        $signalSlotDispatcher = $objectManager->get(Dispatcher::class);
+        $signalSlotDispatcher->dispatch('PackageManagement', 'packagesMayHaveChanged');
+
+        // Do the installation process
+        $objectManager->get(InstallUtility::class)->install($extensionKey);
+
+        $io->success('Activated extension ' . $extensionKey . ' successfully.');
+    }
+}