nextcloud/lib/private/Repair/RepairLegacyStorages.php

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<?php
/**
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* @author Joas Schilling <nickvergessen@owncloud.com>
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* @author Morris Jobke <hey@morrisjobke.de>
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* @author Thomas Müller <thomas.mueller@tmit.eu>
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* @author Vincent Petry <pvince81@owncloud.com>
*
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* @copyright Copyright (c) 2016, ownCloud, Inc.
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* @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/>
*
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*/
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namespace OC\Repair;
use OC\Files\Cache\Storage;
use OC\RepairException;
use OCP\Migration\IOutput;
use OCP\Migration\IRepairStep;
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class RepairLegacyStorages implements IRepairStep{
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/**
* @var \OCP\IConfig
*/
protected $config;
/**
* @var \OCP\IDBConnection
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*/
protected $connection;
protected $findStorageInCacheStatement;
protected $renameStorageStatement;
/**
* @param \OCP\IConfig $config
* @param \OCP\IDBConnection $connection
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*/
public function __construct($config, $connection) {
$this->connection = $connection;
$this->config = $config;
$this->findStorageInCacheStatement = $this->connection->prepare(
'SELECT DISTINCT `storage` FROM `*PREFIX*filecache`'
. ' WHERE `storage` in (?, ?)'
);
$this->renameStorageStatement = $this->connection->prepare(
'UPDATE `*PREFIX*storages`'
. ' SET `id` = ?'
. ' WHERE `id` = ?'
);
}
public function getName() {
return 'Repair legacy storages';
}
/**
* Extracts the user id from a legacy storage id
*
* @param string $storageId legacy storage id in the
* format "local::/path/to/datadir/userid"
* @return string user id extracted from the storage id
*/
private function extractUserId($storageId) {
$storageId = rtrim($storageId, '/');
$pos = strrpos($storageId, '/');
return substr($storageId, $pos + 1);
}
/**
* Fix the given legacy storage by renaming the old id
* to the new id. If the new id already exists, whichever
* storage that has data in the file cache will be used.
* If both have data, nothing will be done and false is
* returned.
*
* @param string $oldId old storage id
* @param int $oldNumericId old storage numeric id
* @param string $userId
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* @return bool true if fixed, false otherwise
* @throws RepairException
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*/
private function fixLegacyStorage($oldId, $oldNumericId, $userId = null) {
// check whether the new storage already exists
if (is_null($userId)) {
$userId = $this->extractUserId($oldId);
}
$newId = 'home::' . $userId;
// check if target id already exists
$newNumericId = Storage::getNumericStorageId($newId);
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if (!is_null($newNumericId)) {
$newNumericId = (int)$newNumericId;
// try and resolve the conflict
// check which one of "local::" or "home::" needs to be kept
$this->findStorageInCacheStatement->execute(array($oldNumericId, $newNumericId));
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$row1 = $this->findStorageInCacheStatement->fetch();
$row2 = $this->findStorageInCacheStatement->fetch();
$this->findStorageInCacheStatement->closeCursor();
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if ($row2 !== false) {
// two results means both storages have data, not auto-fixable
throw new RepairException(
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'Could not automatically fix legacy storage '
. '"' . $oldId . '" => "' . $newId . '"'
. ' because they both have data.'
);
}
if ($row1 === false || (int)$row1['storage'] === $oldNumericId) {
// old storage has data, then delete the empty new id
$toDelete = $newId;
} else if ((int)$row1['storage'] === $newNumericId) {
// new storage has data, then delete the empty old id
$toDelete = $oldId;
} else {
// unknown case, do not continue
return false;
}
// delete storage including file cache
Storage::remove($toDelete);
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// if we deleted the old id, the new id will be used
// automatically
if ($toDelete === $oldId) {
// nothing more to do
return true;
}
}
// rename old id to new id
$newId = Storage::adjustStorageId($newId);
$oldId = Storage::adjustStorageId($oldId);
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$rowCount = $this->renameStorageStatement->execute(array($newId, $oldId));
$this->renameStorageStatement->closeCursor();
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return ($rowCount === 1);
}
/**
* Converts legacy home storage ids in the format
* "local::/data/dir/path/userid/" to the new format "home::userid"
*/
public function run(IOutput $out) {
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// only run once
if ($this->config->getAppValue('core', 'repairlegacystoragesdone') === 'yes') {
return;
}
$dataDir = $this->config->getSystemValue('datadirectory', \OC::$SERVERROOT . '/data/');
$dataDir = rtrim($dataDir, '/') . '/';
$dataDirId = 'local::' . $dataDir;
$count = 0;
$hasWarnings = false;
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$this->connection->beginTransaction();
// note: not doing a direct UPDATE with the REPLACE function
// because regexp search/extract is needed and it is not guaranteed
// to work on all database types
$sql = 'SELECT `id`, `numeric_id` FROM `*PREFIX*storages`'
. ' WHERE `id` LIKE ?'
. ' ORDER BY `id`';
$result = $this->connection->executeQuery($sql, array($this->connection->escapeLikeParameter($dataDirId) . '%'));
while ($row = $result->fetch()) {
$currentId = $row['id'];
// one entry is the datadir itself
if ($currentId === $dataDirId) {
continue;
}
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try {
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if ($this->fixLegacyStorage($currentId, (int)$row['numeric_id'])) {
$count++;
}
}
catch (RepairException $e) {
$hasWarnings = true;
$out->warning('Could not repair legacy storage ' . $currentId . ' automatically.');
}
}
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// check for md5 ids, not in the format "prefix::"
$sql = 'SELECT COUNT(*) AS "c" FROM `*PREFIX*storages`'
. ' WHERE `id` NOT LIKE \'%::%\'';
$result = $this->connection->executeQuery($sql);
$row = $result->fetch();
// find at least one to make sure it's worth
// querying the user list
if ((int)$row['c'] > 0) {
$userManager = \OC::$server->getUserManager();
// use chunks to avoid caching too many users in memory
$limit = 30;
$offset = 0;
do {
// query the next page of users
$results = $userManager->search('', $limit, $offset);
$storageIds = array();
foreach ($results as $uid => $userObject) {
$storageId = $dataDirId . $uid . '/';
if (strlen($storageId) <= 64) {
// skip short storage ids as they were handled in the previous section
continue;
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}
$storageIds[$uid] = $storageId;
}
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if (count($storageIds) > 0) {
// update the storages of these users
foreach ($storageIds as $uid => $storageId) {
$numericId = Storage::getNumericStorageId($storageId);
try {
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if (!is_null($numericId) && $this->fixLegacyStorage($storageId, (int)$numericId)) {
$count++;
}
}
catch (RepairException $e) {
$hasWarnings = true;
$out->warning('Could not repair legacy storage ' . $storageId . ' automatically.');
}
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}
}
$offset += $limit;
} while (count($results) >= $limit);
}
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$out->info('Updated ' . $count . ' legacy home storage ids');
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$this->connection->commit();
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if ($hasWarnings) {
$out->warning('Some legacy storages could not be repaired. Please manually fix them then re-run ./occ maintenance:repair');
} else {
// if all were done, no need to redo the repair during next upgrade
$this->config->setAppValue('core', 'repairlegacystoragesdone', 'yes');
}
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}
}