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<?php
/**
* Copyright (c) 2013 Robin Appelman <icewind@owncloud.com>
* Copyright (c) 2014 Vincent Petry <pvince81@owncloud.com>
* This file is licensed under the Affero General Public License version 3 or
* later.
* See the COPYING-README file.
*/
namespace OC\Repair;
use OC\Hooks\BasicEmitter;
class RepairLegacyStorages extends BasicEmitter {
/**
* @var \OCP\IConfig
*/
protected $config;
/**
* @var \OC\DB\Connection
*/
protected $connection;
protected $findStorageInCacheStatement;
protected $renameStorageStatement;
/**
* @param \OCP\IConfig $config
* @param \OC\DB\Connection $connection
*/
public function __construct($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 $oldNumericId old storage numeric id
*
* @return bool true if fixed, false otherwise
*/
private function fixLegacyStorage($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
$newNumericId = \OC\Files\Cache\Storage::getNumericStorageId($newId);
if (!is_null($newNumericId)) {
$newNumericId = (int)$newNumericId;
// try and resolve the conflict
// check which one of "local::" or "home::" needs to be kept
$result = $this->findStorageInCacheStatement->execute(array($oldNumericId, $newNumericId));
$row1 = $this->findStorageInCacheStatement->fetch();
$row2 = $this->findStorageInCacheStatement->fetch();
$this->findStorageInCacheStatement->closeCursor();
if ($row2 !== false) {
// two results means both storages have data, not auto-fixable
throw new \OC\RepairException(
'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 = $oldId;
} else {
// unknown case, do not continue
return false;
}
// delete storage including file cache
\OC\Files\Cache\Storage::remove($toDelete);
// 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
$newId = \OC\Files\Cache\Storage::adjustStorageId($newId);
$oldId = \OC\Files\Cache\Storage::adjustStorageId($oldId);
$rowCount = $this->renameStorageStatement->execute(array($newId, $oldId));
$this->renameStorageStatement->closeCursor();
return ($rowCount === 1);
}
/**
* Converts legacy home storage ids in the format
* "local::/data/dir/path/userid/" to the new format "home::userid"
*/
public function run() {
// 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;
$this->connection->beginTransaction();
try {
// 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($dataDirId . '%'));
while ($row = $result->fetch()) {
$currentId = $row['id'];
// one entry is the datadir itself
if ($currentId === $dataDirId) {
continue;
}
if ($this->fixLegacyStorage($currentId, (int)$row['numeric_id'])) {
$count++;
}
}
// 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_User::getManager();
// 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();
$userIds = array();
foreach ($results as $uid => $userObject) {
$storageId = $dataDirId . $uid . '/';
if (strlen($storageId) <= 64) {
// skip short storage ids as they were handled in the previous section
continue;
}
$storageIds[$uid] = $storageId;
}
if (count($storageIds) > 0) {
// update the storages of these users
foreach ($storageIds as $uid => $storageId) {
$numericId = \OC\Files\Cache\Storage::getNumericStorageId($storageId);
if (!is_null($numericId) && $this->fixLegacyStorage($storageId, (int)$numericId)) {
$count++;
}
}
}
$offset += $limit;
} while (count($results) >= $limit);
}
$this->emit('\OC\Repair', 'info', array('Updated ' . $count . ' legacy home storage ids'));
$this->connection->commit();
}
catch (\OC\RepairException $e) {
$this->connection->rollback();
throw $e;
}
$this->config->setAppValue('core', 'repairlegacystoragesdone', 'yes');
}
}
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