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Code Editor : updater.inc
<?php /** * @file * Classes used for updating various files in the Drupal webroot. These * classes use a FileTransfer object to actually perform the operations. * Normally, the FileTransfer is provided when the site owner is redirected to * authorize.php as part of a multistep process. */ /** * Interface for a class which can update a Drupal project. * * An Updater currently serves the following purposes: * - It can take a given directory, and determine if it can operate on it. * - It can move the contents of that directory into the appropriate place * on the system using FileTransfer classes. * - It can return a list of "next steps" after an update or install. * - In the future, it will most likely perform some of those steps as well. */ interface DrupalUpdaterInterface { /** * Checks if the project is installed. * * @return bool */ public function isInstalled(); /** * Returns the system name of the project. * * @param string $directory * A directory containing a project. */ public static function getProjectName($directory); /** * @return string * An absolute path to the default install location. */ public function getInstallDirectory(); /** * Determine if the Updater can handle the project provided in $directory. * * @todo: Provide something more rational here, like a project spec file. * * @param string $directory * * @return bool * TRUE if the project is installed, FALSE if not. */ public static function canUpdateDirectory($directory); /** * Actions to run after an install has occurred. */ public function postInstall(); /** * Actions to run after an update has occurred. */ public function postUpdate(); } /** * Base class for Updaters used in Drupal. */ class Updater { /** * @var string $source Directory to install from. */ public $source; public function __construct($source) { $this->source = $source; $this->name = self::getProjectName($source); $this->title = self::getProjectTitle($source); } /** * Return an Updater of the appropriate type depending on the source. * * If a directory is provided which contains a module, will return a * ModuleUpdater. * * @param string $source * Directory of a Drupal project. * * @return Updater */ public static function factory($source) { if (is_dir($source)) { $updater = self::getUpdaterFromDirectory($source); } else { throw new UpdaterException(t('Unable to determine the type of the source directory.')); } return new $updater($source); } /** * Determine which Updater class can operate on the given directory. * * @param string $directory * Extracted Drupal project. * * @return string * The class name which can work with this project type. */ public static function getUpdaterFromDirectory($directory) { // Gets a list of possible implementing classes. $updaters = drupal_get_updaters(); foreach ($updaters as $updater) { $class = $updater['class']; if (call_user_func(array($class, 'canUpdateDirectory'), $directory)) { return $class; } } throw new UpdaterException(t('Cannot determine the type of project.')); } /** * Figure out what the most important (or only) info file is in a directory. * * Since there is no enforcement of which info file is the project's "main" * info file, this will get one with the same name as the directory, or the * first one it finds. Not ideal, but needs a larger solution. * * @param string $directory * Directory to search in. * * @return string * Path to the info file. */ public static function findInfoFile($directory) { $info_files = file_scan_directory($directory, '/.*\.info$/'); if (!$info_files) { return FALSE; } foreach ($info_files as $info_file) { if (drupal_substr($info_file->filename, 0, -5) == drupal_basename($directory)) { // Info file Has the same name as the directory, return it. return $info_file->uri; } } // Otherwise, return the first one. $info_file = array_shift($info_files); return $info_file->uri; } /** * Get the name of the project directory (basename). * * @todo: It would be nice, if projects contained an info file which could * provide their canonical name. * * @param string $directory * * @return string * The name of the project. */ public static function getProjectName($directory) { return drupal_basename($directory); } /** * Return the project name from a Drupal info file. * * @param string $directory * Directory to search for the info file. * * @return string * The title of the project. */ public static function getProjectTitle($directory) { $info_file = self::findInfoFile($directory); $info = drupal_parse_info_file($info_file); if (empty($info)) { throw new UpdaterException(t('Unable to parse info file: %info_file.', array('%info_file' => $info_file))); } if (empty($info['name'])) { throw new UpdaterException(t("The info file (%info_file) does not define a 'name' attribute.", array('%info_file' => $info_file))); } return $info['name']; } /** * Store the default parameters for the Updater. * * @param array $overrides * An array of overrides for the default parameters. * * @return array * An array of configuration parameters for an update or install operation. */ protected function getInstallArgs($overrides = array()) { $args = array( 'make_backup' => FALSE, 'install_dir' => $this->getInstallDirectory(), 'backup_dir' => $this->getBackupDir(), ); return array_merge($args, $overrides); } /** * Updates a Drupal project, returns a list of next actions. * * @param FileTransfer $filetransfer * Object that is a child of FileTransfer. Used for moving files * to the server. * @param array $overrides * An array of settings to override defaults; see self::getInstallArgs(). * * @return array * An array of links which the user may need to complete the update */ public function update(&$filetransfer, $overrides = array()) { try { // Establish arguments with possible overrides. $args = $this->getInstallArgs($overrides); // Take a Backup. if ($args['make_backup']) { $this->makeBackup($args['install_dir'], $args['backup_dir']); } if (!$this->name) { // This is bad, don't want to delete the install directory. throw new UpdaterException(t('Fatal error in update, cowardly refusing to wipe out the install directory.')); } // Make sure the installation parent directory exists and is writable. $this->prepareInstallDirectory($filetransfer, $args['install_dir']); // Note: If the project is installed in sites/all, it will not be // deleted. It will be installed in sites/default as that will override // the sites/all reference and not break other sites which are using it. if (is_dir($args['install_dir'] . '/' . $this->name)) { // Remove the existing installed file. $filetransfer->removeDirectory($args['install_dir'] . '/' . $this->name); } // Copy the directory in place. $filetransfer->copyDirectory($this->source, $args['install_dir']); // Make sure what we just installed is readable by the web server. $this->makeWorldReadable($filetransfer, $args['install_dir'] . '/' . $this->name); // Run the updates. // @TODO: decide if we want to implement this. $this->postUpdate(); // For now, just return a list of links of things to do. return $this->postUpdateTasks(); } catch (FileTransferException $e) { throw new UpdaterFileTransferException(t('File Transfer failed, reason: !reason', array('!reason' => strtr($e->getMessage(), $e->arguments)))); } } /** * Installs a Drupal project, returns a list of next actions. * * @param FileTransfer $filetransfer * Object that is a child of FileTransfer. * @param array $overrides * An array of settings to override defaults; see self::getInstallArgs(). * * @return array * An array of links which the user may need to complete the install. */ public function install(&$filetransfer, $overrides = array()) { try { // Establish arguments with possible overrides. $args = $this->getInstallArgs($overrides); // Make sure the installation parent directory exists and is writable. $this->prepareInstallDirectory($filetransfer, $args['install_dir']); // Copy the directory in place. $filetransfer->copyDirectory($this->source, $args['install_dir']); // Make sure what we just installed is readable by the web server. $this->makeWorldReadable($filetransfer, $args['install_dir'] . '/' . $this->name); // Potentially enable something? // @TODO: decide if we want to implement this. $this->postInstall(); // For now, just return a list of links of things to do. return $this->postInstallTasks(); } catch (FileTransferException $e) { throw new UpdaterFileTransferException(t('File Transfer failed, reason: !reason', array('!reason' => strtr($e->getMessage(), $e->arguments)))); } } /** * Make sure the installation parent directory exists and is writable. * * @param FileTransfer $filetransfer * Object which is a child of FileTransfer. * @param string $directory * The installation directory to prepare. */ public function prepareInstallDirectory(&$filetransfer, $directory) { // Make the parent dir writable if need be and create the dir. if (!is_dir($directory)) { $parent_dir = dirname($directory); if (!is_writable($parent_dir)) { @chmod($parent_dir, 0755); // It is expected that this will fail if the directory is owned by the // FTP user. If the FTP user == web server, it will succeed. try { $filetransfer->createDirectory($directory); $this->makeWorldReadable($filetransfer, $directory); } catch (FileTransferException $e) { // Probably still not writable. Try to chmod and do it again. // @todo: Make a new exception class so we can catch it differently. try { $old_perms = substr(sprintf('%o', fileperms($parent_dir)), -4); $filetransfer->chmod($parent_dir, 0755); $filetransfer->createDirectory($directory); $this->makeWorldReadable($filetransfer, $directory); // Put the permissions back. $filetransfer->chmod($parent_dir, intval($old_perms, 8)); } catch (FileTransferException $e) { $message = t($e->getMessage(), $e->arguments); $throw_message = t('Unable to create %directory due to the following: %reason', array('%directory' => $directory, '%reason' => $message)); throw new UpdaterException($throw_message); } } // Put the parent directory back. @chmod($parent_dir, 0555); } } } /** * Ensure that a given directory is world readable. * * @param FileTransfer $filetransfer * Object which is a child of FileTransfer. * @param string $path * The file path to make world readable. * @param bool $recursive * If the chmod should be applied recursively. */ public function makeWorldReadable(&$filetransfer, $path, $recursive = TRUE) { if (!is_executable($path)) { // Set it to read + execute. $new_perms = substr(sprintf('%o', fileperms($path)), -4, -1) . "5"; $filetransfer->chmod($path, intval($new_perms, 8), $recursive); } } /** * Perform a backup. * * @todo Not implemented. */ public function makeBackup(&$filetransfer, $from, $to) { } /** * Return the full path to a directory where backups should be written. */ public function getBackupDir() { return file_stream_wrapper_get_instance_by_scheme('temporary')->getDirectoryPath(); } /** * Perform actions after new code is updated. */ public function postUpdate() { } /** * Perform actions after installation. */ public function postInstall() { } /** * Return an array of links to pages that should be visited post operation. * * @return array * Links which provide actions to take after the install is finished. */ public function postInstallTasks() { return array(); } /** * Return an array of links to pages that should be visited post operation. * * @return array * Links which provide actions to take after the update is finished. */ public function postUpdateTasks() { return array(); } } /** * Exception class for the Updater class hierarchy. * * This is identical to the base Exception class, we just give it a more * specific name so that call sites that want to tell the difference can * specifically catch these exceptions and treat them differently. */ class UpdaterException extends Exception { } /** * Child class of UpdaterException that indicates a FileTransfer exception. * * We have to catch FileTransfer exceptions and wrap those in t(), since * FileTransfer is so low-level that it doesn't use any Drupal APIs and none * of the strings are translated. */ class UpdaterFileTransferException extends UpdaterException { }
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