first commit

typo3/sysext/backend/Classes/Command/LockBackendCommand.php

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+<?php
+namespace TYPO3\CMS\Backend\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\Environment;
+use TYPO3\CMS\Core\Utility\GeneralUtility;
+
+/**
+ * Core function for locking the TYPO3 Backend
+ */
+class LockBackendCommand extends Command
+{
+    /**
+     * Configure the command by defining the name, options and arguments
+     */
+    protected function configure()
+    {
+        $this
+            ->setDescription('Lock the TYPO3 Backend')
+            ->addArgument(
+                'redirect',
+                InputArgument::OPTIONAL,
+                'If set, then the TYPO3 Backend will redirect to the locking state (only used when locking the TYPO3 Backend'
+            );
+    }
+
+    /**
+     * Executes the command for adding the lock file
+     *
+     * @param InputInterface $input
+     * @param OutputInterface $output
+     */
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        $io = new SymfonyStyle($input, $output);
+        $io->title($this->getDescription());
+        $lockFile = $this->getLockFileName();
+        if (@is_file($lockFile)) {
+            $io->note('A lock file already exists. Overwriting it.');
+        }
+        $output = 'Wrote lock file to "' . $lockFile . '"';
+        if ($input->getArgument('redirect')) {
+            $lockFileContent = $input->getArgument('redirect');
+            $output .= LF . 'with content "' . $lockFileContent . '".';
+        } else {
+            $lockFileContent = '';
+            $output .= '.';
+        }
+        GeneralUtility::writeFile($lockFile, $lockFileContent);
+        $io->success($output);
+    }
+
+    /**
+     * Location of the file name
+     *
+     * @return string
+     */
+    protected function getLockFileName()
+    {
+        return Environment::getLegacyConfigPath() . '/LOCK_BACKEND';
+    }
+}

typo3/sysext/backend/Classes/Command/ReferenceIndexUpdateCommand.php

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+<?php
+namespace TYPO3\CMS\Backend\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\InputInterface;
+use Symfony\Component\Console\Input\InputOption;
+use Symfony\Component\Console\Output\OutputInterface;
+use TYPO3\CMS\Core\Core\Bootstrap;
+use TYPO3\CMS\Core\Database\ReferenceIndex;
+use TYPO3\CMS\Core\Utility\GeneralUtility;
+
+/**
+ * Core function to check/update the Reference Index
+ */
+class ReferenceIndexUpdateCommand extends Command
+{
+    /**
+     * Configure the command by defining the name, options and arguments
+     */
+    public function configure()
+    {
+        $this->setDescription('Update the reference index of TYPO3')
+            ->addOption(
+                'check',
+                'c',
+                InputOption::VALUE_NONE,
+                'Only check the reference index of TYPO3'
+            );
+    }
+
+    /**
+     * Executes the command for adding or removing the lock file
+     *
+     * @param InputInterface $input
+     * @param OutputInterface $output
+     */
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        Bootstrap::initializeBackendAuthentication();
+
+        $isTestOnly = $input->getOption('check');
+        $isSilent = $output->getVerbosity() !== OutputInterface::VERBOSITY_QUIET;
+
+        /** @var ReferenceIndex $referenceIndex */
+        $referenceIndex = GeneralUtility::makeInstance(ReferenceIndex::class);
+        $referenceIndex->enableRuntimeCache();
+        $referenceIndex->updateIndex($isTestOnly, $isSilent);
+    }
+}

typo3/sysext/backend/Classes/Command/UnlockBackendCommand.php

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+<?php
+namespace TYPO3\CMS\Backend\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\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+use Symfony\Component\Console\Style\SymfonyStyle;
+use TYPO3\CMS\Core\Core\Environment;
+
+/**
+ * Core function for unlocking the TYPO3 Backend
+ */
+class UnlockBackendCommand extends Command
+{
+    /**
+     * Configure the command by defining the name, options and arguments
+     */
+    protected function configure()
+    {
+        $this->setDescription('Unlock the TYPO3 Backend');
+    }
+
+    /**
+     * Executes the command for removing the lock file
+     *
+     * @param InputInterface $input
+     * @param OutputInterface $output
+     */
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        $io = new SymfonyStyle($input, $output);
+        $io->title($this->getDescription());
+        $lockFile = $this->getLockFileName();
+        if (@is_file($lockFile)) {
+            unlink($lockFile);
+            if (@is_file($lockFile)) {
+                $io->caution('Could not remove lock file "' . $lockFile . '"!');
+            } else {
+                $io->success('Removed lock file "' . $lockFile . '".');
+            }
+        } else {
+            $io->note('No lock file "' . $lockFile . '" was found.' . LF . 'Hence no lock can be removed.');
+        }
+    }
+
+    /**
+     * Location of the file name
+     *
+     * @return string
+     */
+    protected function getLockFileName()
+    {
+        return Environment::getLegacyConfigPath() . '/LOCK_BACKEND';
+    }
+}