Updater.php 12.1 KB
Newer Older
1 2 3 4
<?php

/**
 * @file
5
 * Definition of Drupal\Core\Updater\Updater.
6 7
 */

8 9
namespace Drupal\Core\Updater;

10
use Drupal\Component\Utility\Unicode;
11
use Drupal\Core\FileTransfer\FileTransferException;
12
use Drupal\Core\FileTransfer\FileTransferInterface;
13

14
/**
15
 * Defines the base class for Updaters used in Drupal.
16
 */
17
class Updater {
18 19

  /**
20
   * Directory to install from.
21
   *
22
   * @var string
23
   */
24
  public $source;
25 26

  /**
27
   * Constructs a new updater.
28
   *
29 30
   * @param string $source
   *   Directory to install from.
31 32 33 34 35 36 37 38
   */
  public function __construct($source) {
    $this->source = $source;
    $this->name = self::getProjectName($source);
    $this->title = self::getProjectTitle($source);
  }

  /**
39
   * Returns an Updater of the appropriate type depending on the source.
40 41 42 43 44 45 46
   *
   * If a directory is provided which contains a module, will return a
   * ModuleUpdater.
   *
   * @param string $source
   *   Directory of a Drupal project.
   *
47
   * @return \Drupal\Core\Updater\Updater
48 49
   *   A new Drupal\Core\Updater\Updater object.
   *
50
   * @throws \Drupal\Core\Updater\UpdaterException
51 52 53 54 55 56 57 58 59 60 61 62
   */
  public static function factory($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);
  }

  /**
63
   * Determines which Updater class can operate on the given directory.
64 65 66 67 68 69
   *
   * @param string $directory
   *   Extracted Drupal project.
   *
   * @return string
   *   The class name which can work with this project type.
70
   *
71
   * @throws \Drupal\Core\Updater\UpdaterException
72 73 74 75 76 77 78 79 80 81 82 83 84 85
   */
  public static function getUpdaterFromDirectory($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.'));
  }

  /**
86
   * Determines what the most important (or only) info file is in a directory.
87 88 89 90 91 92 93 94 95 96 97 98
   *
   * 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) {
99
    $info_files = file_scan_directory($directory, '/.*\.info.yml$/');
100 101 102 103
    if (!$info_files) {
      return FALSE;
    }
    foreach ($info_files as $info_file) {
104
      if (Unicode::substr($info_file->filename, 0, -5) == drupal_basename($directory)) {
105 106 107 108 109 110 111 112 113 114
        // 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;
  }

  /**
115
   * Gets the name of the project directory (basename).
116
   *
117 118
   * @todo It would be nice, if projects contained an info file which could
   *   provide their canonical name.
119 120 121 122 123 124 125 126 127 128 129
   *
   * @param string $directory
   *
   * @return string
   *   The name of the project.
   */
  public static function getProjectName($directory) {
    return drupal_basename($directory);
  }

  /**
130
   * Returns the project name from a Drupal info file.
131 132 133 134 135 136
   *
   * @param string $directory
   *   Directory to search for the info file.
   *
   * @return string
   *   The title of the project.
137
   *
138
   * @throws \Drupal\Core\Updater\UpdaterException
139 140 141
   */
  public static function getProjectTitle($directory) {
    $info_file = self::findInfoFile($directory);
142
    $info = \Drupal::service('info_parser')->parse($info_file);
143 144 145 146 147 148 149
    if (empty($info)) {
      throw new UpdaterException(t('Unable to parse info file: %info_file.', array('%info_file' => $info_file)));
    }
    return $info['name'];
  }

  /**
150
   * Stores the default parameters for the Updater.
151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167
   *
   * @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);
  }

  /**
168
   * Updates a Drupal project and returns a list of next actions.
169
   *
170
   * @param \Drupal\Core\FileTransfer\FileTransferInterface $filetransfer
171 172 173 174 175 176 177
   *   Object that is a child of FileTransfer. Used for moving files
   *   to the server.
   * @param array $overrides
   *   An array of settings to override defaults; see self::getInstallArgs().
   *
   * @return array
   *   An array of links which the user may need to complete the update
178
   *
179 180
   * @throws \Drupal\Core\Updater\UpdaterException
   * @throws \Drupal\Core\Updater\UpdaterFileTransferException
181 182 183 184 185 186 187 188
   */
  public function update(&$filetransfer, $overrides = array()) {
    try {
      // Establish arguments with possible overrides.
      $args = $this->getInstallArgs($overrides);

      // Take a Backup.
      if ($args['make_backup']) {
189
        $this->makeBackup($filetransfer, $args['install_dir'], $args['backup_dir']);
190 191 192 193 194 195 196 197 198 199
      }

      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']);

200
      // Note: If the project is installed in the top-level, it will not be
201
      // deleted. It will be installed in sites/default as that will override
202
      // the top-level reference and not break other sites which are using it.
203 204 205 206 207 208 209 210 211 212 213 214
      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.
215
      // @todo Decide if we want to implement this.
216 217 218 219 220 221 222 223 224 225 226 227 228
      $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.
   *
229
   * @param \Drupal\Core\FileTransfer\FileTransferInterface $filetransfer
230 231 232 233 234 235
   *   Object that is a child of FileTransfer.
   * @param array $overrides
   *   An array of settings to override defaults; see self::getInstallArgs().
   *
   * @return array
   *   An array of links which the user may need to complete the install.
236
   *
237
   * @throws \Drupal\Core\Updater\UpdaterFileTransferException
238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253
   */
  public function install(&$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?
254
      // @todo Decide if we want to implement this.
255 256 257 258 259 260 261 262 263 264
      $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))));
    }
  }

  /**
265
   * Makes sure the installation parent directory exists and is writable.
266
   *
267
   * @param \Drupal\Core\FileTransfer\FileTransferInterface $filetransfer
268 269 270
   *   Object which is a child of FileTransfer.
   * @param string $directory
   *   The installation directory to prepare.
271
   *
272
   * @throws \Drupal\Core\Updater\UpdaterException
273 274 275 276 277 278 279 280 281 282 283 284 285 286 287
   */
  public function prepareInstallDirectory(&$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.
288
          // @todo Make a new exception class so we can catch it differently.
289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309
          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);
      }
    }
  }

  /**
310
   * Ensures that a given directory is world readable.
311
   *
312
   * @param \Drupal\Core\FileTransfer\FileTransferInterface $filetransfer
313 314 315 316 317 318 319 320 321 322 323 324 325 326 327
   *   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);
    }
  }

  /**
328
   * Performs a backup.
329
   *
330 331 332 333 334 335 336
   * @param \Drupal\Core\FileTransfer\FileTransferInterface $filetransfer
   *   Object which is a child of FileTransfer.
   * @param string $from
   *   The file path to copy from.
   * @param string $to
   *   The file path to copy to.
   *
337 338
   * @todo Not implemented.
   */
339
  public function makeBackup(FileTransferInterface $filetransfer, $from, $to) {
340 341 342
  }

  /**
343
   * Returns the full path to a directory where backups should be written.
344 345 346 347 348 349
   */
  public function getBackupDir() {
    return file_stream_wrapper_get_instance_by_scheme('temporary')->getDirectoryPath();
  }

  /**
350
   * Performs actions after new code is updated.
351 352 353 354 355
   */
  public function postUpdate() {
  }

  /**
356
   * Performs actions after installation.
357 358 359 360 361
   */
  public function postInstall() {
  }

  /**
362
   * Returns an array of links to pages that should be visited post operation.
363 364 365 366 367 368 369 370 371
   *
   * @return array
   *   Links which provide actions to take after the install is finished.
   */
  public function postInstallTasks() {
    return array();
  }

  /**
372
   * Returns an array of links to pages that should be visited post operation.
373 374 375 376 377 378 379 380
   *
   * @return array
   *   Links which provide actions to take after the update is finished.
   */
  public function postUpdateTasks() {
    return array();
  }
}