[forward_port] Verify checksums command

apps/files/appinfo/info.xml

@@ -27,6 +27,7 @@
 		<command>OCA\Files\Command\Scan</command>
 		<command>OCA\Files\Command\DeleteOrphanedFiles</command>
 		<command>OCA\Files\Command\TransferOwnership</command>
+		<command>OCA\Files\Command\VerifyChecksums</command>
 	</commands>
 
 	<navigation>

apps/files/lib/Command/VerifyChecksums.php

@@ -0,0 +1,205 @@
+<?php
+/**
+ * @author Ilja Neumann <[email protected]>
+ *
+ * @copyright Copyright (c) 2018, ownCloud GmbH
+ * @license AGPL-3.0
+ *
+ * This code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License, version 3,
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+namespace OCA\Files\Command;
+
+
+use OC\Files\FileInfo;
+use OC\Files\Storage\Wrapper\Checksum;
+use OCP\Files\IRootFolder;
+use OCP\Files\Node;
+use OCP\Files\NotFoundException;
+use OCP\Files\Storage\IStorage;
+use OCP\IUser;
+use OCP\IUserManager;
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Input\InputOption;
+use Symfony\Component\Console\Output\OutputInterface;
+
+
+/**
+ * Recomputes checksums for all files and compares them to filecache
+ * entries. Provides repair option on mismatch.
+ *
+ * @package OCA\Files\Command
+ */
+class VerifyChecksums extends Command {
+
+
+	const EXIT_NO_ERRORS = 0;
+	const EXIT_CHECKSUM_ERRORS = 1;
+	const EXIT_INVALID_ARGS = 2;
+
+	/**
+	 * @var IRootFolder
+	 */
+	private $rootFolder;
+
+	/**
+	 * @var IUserManager
+	 */
+	private $userManager;
+
+	private $exitStatus = self::EXIT_NO_ERRORS;
+
+	/**
+	 * VerifyChecksums constructor.
+	 *
+	 * @param IRootFolder $rootFolder
+	 * @param IUserManager $userManager
+	 */
+	public function __construct(IRootFolder $rootFolder, IUserManager $userManager) {
+		parent::__construct(null);
+		$this->rootFolder = $rootFolder;
+		$this->userManager = $userManager;
+	}
+
+	protected function configure() {
+		$this
+			->setName('files:checksums:verify')
+			->setDescription('Get all checksums in filecache and compares them by recalculating the checksum of the file.')
+			->addOption('repair', 'r', InputOption::VALUE_NONE, 'Repair filecache-entry with mismatched checksums.')
+			->addOption('user', 'u', InputOption::VALUE_REQUIRED, 'Specific user to check')
+			->addOption('path', 'p', InputOption::VALUE_REQUIRED, 'Path to check relative to data e.g /john/files/', '');
+	}
+
+	public function execute(InputInterface $input, OutputInterface $output) {
+		$pathOption = $input->getOption('path');
+		$userName = $input->getOption('user');
+
+		if (!$pathOption && !$userName) {
+			$output->writeln('<info>This operation might take very long.</info>');
+		}
+
+		if ($pathOption && $userName) {
+			$output->writeln('<error>Please use either path or user exclusively</error>');
+			$this->exitStatus = self::EXIT_INVALID_ARGS;
+
+		}
+
+		$walkFunction = function (Node $node) use ($input, $output) {
+			$path = $node->getInternalPath();
+			$currentChecksums = $node->getChecksum();
+
+			// Files without calculated checksum can't cause checksum errors
+			if (empty($currentChecksums)) {
+				$output->writeln("Skipping $path => No Checksum", OutputInterface::VERBOSITY_VERBOSE);
+				return;
+			}
+
+			$output->writeln("Checking $path => $currentChecksums", OutputInterface::VERBOSITY_VERBOSE);
+			$actualChecksums = self::calculateActualChecksums($path, $node->getStorage());
+
+			if ($actualChecksums !== $currentChecksums) {
+				$output->writeln(
+					"<info>Mismatch for $path:\n Filecache:\t$currentChecksums\n Actual:\t$actualChecksums</info>"
+				);
+
+				$this->exitStatus = self::EXIT_CHECKSUM_ERRORS;
+
+				if ($input->getOption('repair')) {
+					$output->writeln("<info>Repairing $path</info>");
+					$this->updateChecksumsForNode($node, $actualChecksums);
+					$this->exitStatus = self::EXIT_NO_ERRORS;
+				}
+			}
+		};
+
+		$scanUserFunction = function(IUser $user) use ($input, $output, $walkFunction) {
+			$userFolder = $this->rootFolder->getUserFolder($user->getUID())->getParent();
+			$this->walkNodes($userFolder->getDirectoryListing(), $walkFunction);
+		};
+
+		if ($userName && $this->userManager->userExists($userName)) {
+			$scanUserFunction($this->userManager->get($userName));
+		} else if ($userName && !$this->userManager->userExists($userName)) {
+			$output->writeln("<error>User \"$userName\" does not exist</error>");
+			$this->exitStatus = self::EXIT_INVALID_ARGS;
+		} else if ($input->getOption('path')) {
+
+			try {
+				$node = $this->rootFolder->get($input->getOption('path'));
+			} catch (NotFoundException $ex) {
+				$output->writeln("<error>Path \"{$ex->getMessage()}\" not found.</error>");
+				$this->exitStatus = self::EXIT_INVALID_ARGS;
+				return $this->exitStatus;
+			}
+
+			$this->walkNodes([$node], $walkFunction);
+
+		} else {
+			$this->userManager->callForAllUsers($scanUserFunction);
+		}
+
+
+		return $this->exitStatus;
+	}
+
+
+	/**
+	 * Recursive walk nodes
+	 *
+	 * @param Node[] $nodes
+	 * @param \Closure $callBack
+	 */
+	private function walkNodes(array $nodes, \Closure $callBack) {
+		foreach ($nodes as $node) {
+			if ($node->getType() === FileInfo::TYPE_FOLDER) {
+				$this->walkNodes($node->getDirectoryListing(), $callBack);
+			} else {
+				$callBack($node);
+			}
+		}
+	}
+
+	/**
+	 * @param Node $node
+	 * @param $correctChecksum
+	 * @throws NotFoundException
+	 * @throws \OCP\Files\InvalidPathException
+	 * @throws \OCP\Files\StorageNotAvailableException
+	 */
+	private function updateChecksumsForNode(Node $node, $correctChecksum) {
+		$storage = $node->getStorage();
+		$cache = $storage->getCache();
+		$cache->update(
+			$node->getId(),
+			['checksum' => $correctChecksum]
+		);
+	}
+
+	/**
+	 * @param $path
+	 * @param IStorage $storage
+	 * @return string
+	 * @throws \OCP\Files\StorageNotAvailableException
+	 */
+	private static function calculateActualChecksums($path, IStorage $storage) {
+		return sprintf(
+			Checksum::CHECKSUMS_DB_FORMAT,
+			$storage->hash('sha1', $path),
+			$storage->hash('md5', $path),
+			$storage->hash('adler32', $path)
+		);
+	}
+}
+