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/wp-admin/includes/ -> class-core-upgrader.php (source)

   1  <?php
   2  /**
   3   * Upgrade API: Core_Upgrader class
   4   *
   5   * @package WordPress
   6   * @subpackage Upgrader
   7   * @since 4.6.0
   8   */
   9  
  10  /**
  11   * Core class used for updating core.
  12   *
  13   * It allows for WordPress to upgrade itself in combination with
  14   * the wp-admin/includes/update-core.php file.
  15   *
  16   * Note: Newly introduced functions and methods cannot be used here.
  17   * All functions must be present in the previous version being upgraded from
  18   * as this file is used there too.
  19   *
  20   * @since 2.8.0
  21   * @since 4.6.0 Moved to its own file from wp-admin/includes/class-wp-upgrader.php.
  22   *
  23   * @see WP_Upgrader
  24   */
  25  class Core_Upgrader extends WP_Upgrader {
  26  
  27      /**
  28       * Initializes the upgrade strings.
  29       *
  30       * @since 2.8.0
  31       */
  32  	public function upgrade_strings() {
  33          $this->strings['up_to_date'] = __( 'WordPress is at the latest version.' );
  34          $this->strings['locked']     = __( 'Another update is currently in progress.' );
  35          $this->strings['no_package'] = __( 'Update package not available.' );
  36          /* translators: %s: Package URL. */
  37          $this->strings['downloading_package']   = sprintf( __( 'Downloading update from %s&#8230;' ), '<span class="code pre">%s</span>' );
  38          $this->strings['unpack_package']        = __( 'Unpacking the update&#8230;' );
  39          $this->strings['copy_failed']           = __( 'Could not copy files.' );
  40          $this->strings['copy_failed_space']     = __( 'Could not copy files. You may have run out of disk space.' );
  41          $this->strings['start_rollback']        = __( 'Attempting to restore the previous version.' );
  42          $this->strings['rollback_was_required'] = __( 'Due to an error during updating, WordPress has been restored to your previous version.' );
  43      }
  44  
  45      /**
  46       * Upgrades WordPress core.
  47       *
  48       * @since 2.8.0
  49       *
  50       * @global WP_Filesystem_Base $wp_filesystem                WordPress filesystem subclass.
  51       * @global callable           $_wp_filesystem_direct_method
  52       *
  53       * @param object $current Response object for whether WordPress is current.
  54       * @param array  $args {
  55       *     Optional. Arguments for upgrading WordPress core. Default empty array.
  56       *
  57       *     @type bool $pre_check_md5    Whether to check the file checksums before
  58       *                                  attempting the upgrade. Default true.
  59       *     @type bool $attempt_rollback Whether to attempt to rollback the chances if
  60       *                                  there is a problem. Default false.
  61       *     @type bool $do_rollback      Whether to perform this "upgrade" as a rollback.
  62       *                                  Default false.
  63       * }
  64       * @return string|false|WP_Error New WordPress version on success, false or WP_Error on failure.
  65       */
  66  	public function upgrade( $current, $args = array() ) {
  67          global $wp_filesystem;
  68  
  69          require  ABSPATH . WPINC . '/version.php'; // $wp_version;
  70  
  71          $start_time = time();
  72  
  73          $defaults    = array(
  74              'pre_check_md5'                => true,
  75              'attempt_rollback'             => false,
  76              'do_rollback'                  => false,
  77              'allow_relaxed_file_ownership' => false,
  78          );
  79          $parsed_args = wp_parse_args( $args, $defaults );
  80  
  81          $this->init();
  82          $this->upgrade_strings();
  83  
  84          // Is an update available?
  85          if ( ! isset( $current->response ) || 'latest' === $current->response ) {
  86              return new WP_Error( 'up_to_date', $this->strings['up_to_date'] );
  87          }
  88  
  89          $res = $this->fs_connect( array( ABSPATH, WP_CONTENT_DIR ), $parsed_args['allow_relaxed_file_ownership'] );
  90          if ( ! $res || is_wp_error( $res ) ) {
  91              return $res;
  92          }
  93  
  94          $wp_dir = trailingslashit( $wp_filesystem->abspath() );
  95  
  96          $partial = true;
  97          if ( $parsed_args['do_rollback'] ) {
  98              $partial = false;
  99          } elseif ( $parsed_args['pre_check_md5'] && ! $this->check_files() ) {
 100              $partial = false;
 101          }
 102  
 103          /*
 104           * If partial update is returned from the API, use that, unless we're doing
 105           * a reinstallation. If we cross the new_bundled version number, then use
 106           * the new_bundled zip. Don't though if the constant is set to skip bundled items.
 107           * If the API returns a no_content zip, go with it. Finally, default to the full zip.
 108           */
 109          if ( $parsed_args['do_rollback'] && $current->packages->rollback ) {
 110              $to_download = 'rollback';
 111          } elseif ( $current->packages->partial && 'reinstall' !== $current->response && $wp_version === $current->partial_version && $partial ) {
 112              $to_download = 'partial';
 113          } elseif ( $current->packages->new_bundled && version_compare( $wp_version, $current->new_bundled, '<' )
 114              && ( ! defined( 'CORE_UPGRADE_SKIP_NEW_BUNDLED' ) || ! CORE_UPGRADE_SKIP_NEW_BUNDLED ) ) {
 115              $to_download = 'new_bundled';
 116          } elseif ( $current->packages->no_content ) {
 117              $to_download = 'no_content';
 118          } else {
 119              $to_download = 'full';
 120          }
 121  
 122          // Lock to prevent multiple Core Updates occurring.
 123          $lock = WP_Upgrader::create_lock( 'core_updater', 15 * MINUTE_IN_SECONDS );
 124          if ( ! $lock ) {
 125              return new WP_Error( 'locked', $this->strings['locked'] );
 126          }
 127  
 128          $download = $this->download_package( $current->packages->$to_download, false );
 129  
 130          /*
 131           * Allow for signature soft-fail.
 132           * WARNING: This may be removed in the future.
 133           */
 134          if ( is_wp_error( $download ) && $download->get_error_data( 'softfail-filename' ) ) {
 135              // Output the failure error as a normal feedback, and not as an error:
 136              /** This filter is documented in wp-admin/includes/update-core.php */
 137              apply_filters( 'update_feedback', $download->get_error_message() );
 138  
 139              // Report this failure back to WordPress.org for debugging purposes.
 140              wp_version_check(
 141                  array(
 142                      'signature_failure_code' => $download->get_error_code(),
 143                      'signature_failure_data' => $download->get_error_data(),
 144                  )
 145              );
 146  
 147              // Pretend this error didn't happen.
 148              $download = $download->get_error_data( 'softfail-filename' );
 149          }
 150  
 151          if ( is_wp_error( $download ) ) {
 152              WP_Upgrader::release_lock( 'core_updater' );
 153              return $download;
 154          }
 155  
 156          $working_dir = $this->unpack_package( $download );
 157          if ( is_wp_error( $working_dir ) ) {
 158              WP_Upgrader::release_lock( 'core_updater' );
 159              return $working_dir;
 160          }
 161  
 162          // Copy update-core.php from the new version into place.
 163          if ( ! $wp_filesystem->copy( $working_dir . '/wordpress/wp-admin/includes/update-core.php', $wp_dir . 'wp-admin/includes/update-core.php', true ) ) {
 164              $wp_filesystem->delete( $working_dir, true );
 165              WP_Upgrader::release_lock( 'core_updater' );
 166              return new WP_Error( 'copy_failed_for_update_core_file', __( 'The update cannot be installed because some files could not be copied. This is usually due to inconsistent file permissions.' ), 'wp-admin/includes/update-core.php' );
 167          }
 168          $wp_filesystem->chmod( $wp_dir . 'wp-admin/includes/update-core.php', FS_CHMOD_FILE );
 169  
 170          wp_opcache_invalidate( ABSPATH . 'wp-admin/includes/update-core.php' );
 171          require_once  ABSPATH . 'wp-admin/includes/update-core.php';
 172  
 173          if ( ! function_exists( 'update_core' ) ) {
 174              WP_Upgrader::release_lock( 'core_updater' );
 175              return new WP_Error( 'copy_failed_space', $this->strings['copy_failed_space'] );
 176          }
 177  
 178          $result = update_core( $working_dir, $wp_dir );
 179  
 180          // In the event of an issue, we may be able to roll back.
 181          if ( $parsed_args['attempt_rollback'] && $current->packages->rollback && ! $parsed_args['do_rollback'] ) {
 182              $try_rollback = false;
 183              if ( is_wp_error( $result ) ) {
 184                  $error_code = $result->get_error_code();
 185                  /*
 186                   * Not all errors are equal. These codes are critical: copy_failed__copy_dir,
 187                   * mkdir_failed__copy_dir, copy_failed__copy_dir_retry, and disk_full.
 188                   * do_rollback allows for update_core() to trigger a rollback if needed.
 189                   */
 190                  if ( str_contains( $error_code, 'do_rollback' ) ) {
 191                      $try_rollback = true;
 192                  } elseif ( str_contains( $error_code, '__copy_dir' ) ) {
 193                      $try_rollback = true;
 194                  } elseif ( 'disk_full' === $error_code ) {
 195                      $try_rollback = true;
 196                  }
 197              }
 198  
 199              if ( $try_rollback ) {
 200                  /** This filter is documented in wp-admin/includes/update-core.php */
 201                  apply_filters( 'update_feedback', $result );
 202  
 203                  /** This filter is documented in wp-admin/includes/update-core.php */
 204                  apply_filters( 'update_feedback', $this->strings['start_rollback'] );
 205  
 206                  $rollback_result = $this->upgrade( $current, array_merge( $parsed_args, array( 'do_rollback' => true ) ) );
 207  
 208                  $original_result = $result;
 209                  $result          = new WP_Error(
 210                      'rollback_was_required',
 211                      $this->strings['rollback_was_required'],
 212                      (object) array(
 213                          'update'   => $original_result,
 214                          'rollback' => $rollback_result,
 215                      )
 216                  );
 217              }
 218          }
 219  
 220          /** This action is documented in wp-admin/includes/class-wp-upgrader.php */
 221          do_action(
 222              'upgrader_process_complete',
 223              $this,
 224              array(
 225                  'action' => 'update',
 226                  'type'   => 'core',
 227              )
 228          );
 229  
 230          // Clear the current updates.
 231          delete_site_transient( 'update_core' );
 232  
 233          if ( ! $parsed_args['do_rollback'] ) {
 234              $stats = array(
 235                  'update_type'      => $current->response,
 236                  'success'          => true,
 237                  'fs_method'        => $wp_filesystem->method,
 238                  'fs_method_forced' => defined( 'FS_METHOD' ) || has_filter( 'filesystem_method' ),
 239                  'fs_method_direct' => ! empty( $GLOBALS['_wp_filesystem_direct_method'] ) ? $GLOBALS['_wp_filesystem_direct_method'] : '',
 240                  'time_taken'       => time() - $start_time,
 241                  'reported'         => $wp_version,
 242                  'attempted'        => $current->version,
 243              );
 244  
 245              if ( is_wp_error( $result ) ) {
 246                  $stats['success'] = false;
 247                  // Did a rollback occur?
 248                  if ( ! empty( $try_rollback ) ) {
 249                      $stats['error_code'] = $original_result->get_error_code();
 250                      $stats['error_data'] = $original_result->get_error_data();
 251                      // Was the rollback successful? If not, collect its error too.
 252                      $stats['rollback'] = ! is_wp_error( $rollback_result );
 253                      if ( is_wp_error( $rollback_result ) ) {
 254                          $stats['rollback_code'] = $rollback_result->get_error_code();
 255                          $stats['rollback_data'] = $rollback_result->get_error_data();
 256                      }
 257                  } else {
 258                      $stats['error_code'] = $result->get_error_code();
 259                      $stats['error_data'] = $result->get_error_data();
 260                  }
 261              }
 262  
 263              wp_version_check( $stats );
 264          }
 265  
 266          WP_Upgrader::release_lock( 'core_updater' );
 267  
 268          return $result;
 269      }
 270  
 271      /**
 272       * Determines if this WordPress Core version should update to an offered version or not.
 273       *
 274       * @since 3.7.0
 275       *
 276       * @param string $offered_ver The offered version, of the format x.y.z.
 277       * @return bool True if we should update to the offered version, otherwise false.
 278       */
 279  	public static function should_update_to_version( $offered_ver ) {
 280          require  ABSPATH . WPINC . '/version.php'; // $wp_version; // x.y.z
 281  
 282          $current_branch = implode( '.', array_slice( preg_split( '/[.-]/', $wp_version ), 0, 2 ) ); // x.y
 283          $new_branch     = implode( '.', array_slice( preg_split( '/[.-]/', $offered_ver ), 0, 2 ) ); // x.y
 284  
 285          $current_is_development_version = (bool) strpos( $wp_version, '-' );
 286  
 287          // Defaults:
 288          $upgrade_dev   = get_site_option( 'auto_update_core_dev', 'enabled' ) === 'enabled';
 289          $upgrade_minor = get_site_option( 'auto_update_core_minor', 'enabled' ) === 'enabled';
 290          $upgrade_major = get_site_option( 'auto_update_core_major', 'unset' ) === 'enabled';
 291  
 292          // WP_AUTO_UPDATE_CORE = true (all), 'beta', 'rc', 'development', 'branch-development', 'minor', false.
 293          if ( defined( 'WP_AUTO_UPDATE_CORE' ) ) {
 294              if ( false === WP_AUTO_UPDATE_CORE ) {
 295                  // Defaults to turned off, unless a filter allows it.
 296                  $upgrade_dev   = false;
 297                  $upgrade_minor = false;
 298                  $upgrade_major = false;
 299              } elseif ( true === WP_AUTO_UPDATE_CORE
 300                  || in_array( WP_AUTO_UPDATE_CORE, array( 'beta', 'rc', 'development', 'branch-development' ), true )
 301              ) {
 302                  // ALL updates for core.
 303                  $upgrade_dev   = true;
 304                  $upgrade_minor = true;
 305                  $upgrade_major = true;
 306              } elseif ( 'minor' === WP_AUTO_UPDATE_CORE ) {
 307                  // Only minor updates for core.
 308                  $upgrade_dev   = false;
 309                  $upgrade_minor = true;
 310                  $upgrade_major = false;
 311              }
 312          }
 313  
 314          // 1: If we're already on that version, not much point in updating?
 315          if ( $offered_ver === $wp_version ) {
 316              return false;
 317          }
 318  
 319          // 2: If we're running a newer version, that's a nope.
 320          if ( version_compare( $wp_version, $offered_ver, '>' ) ) {
 321              return false;
 322          }
 323  
 324          $failure_data = get_site_option( 'auto_core_update_failed' );
 325          if ( $failure_data ) {
 326              // If this was a critical update failure, cannot update.
 327              if ( ! empty( $failure_data['critical'] ) ) {
 328                  return false;
 329              }
 330  
 331              // Don't claim we can update on update-core.php if we have a non-critical failure logged.
 332              if ( $wp_version === $failure_data['current'] && str_contains( $offered_ver, '.1.next.minor' ) ) {
 333                  return false;
 334              }
 335  
 336              /*
 337               * Cannot update if we're retrying the same A to B update that caused a non-critical failure.
 338               * Some non-critical failures do allow retries, like download_failed.
 339               * 3.7.1 => 3.7.2 resulted in files_not_writable, if we are still on 3.7.1 and still trying to update to 3.7.2.
 340               */
 341              if ( empty( $failure_data['retry'] ) && $wp_version === $failure_data['current'] && $offered_ver === $failure_data['attempted'] ) {
 342                  return false;
 343              }
 344          }
 345  
 346          // 3: 3.7-alpha-25000 -> 3.7-alpha-25678 -> 3.7-beta1 -> 3.7-beta2.
 347          if ( $current_is_development_version ) {
 348  
 349              /**
 350               * Filters whether to enable automatic core updates for development versions.
 351               *
 352               * @since 3.7.0
 353               *
 354               * @param bool $upgrade_dev Whether to enable automatic updates for
 355               *                          development versions.
 356               */
 357              if ( ! apply_filters( 'allow_dev_auto_core_updates', $upgrade_dev ) ) {
 358                  return false;
 359              }
 360              // Else fall through to minor + major branches below.
 361          }
 362  
 363          // 4: Minor in-branch updates (3.7.0 -> 3.7.1 -> 3.7.2 -> 3.7.4).
 364          if ( $current_branch === $new_branch ) {
 365  
 366              /**
 367               * Filters whether to enable minor automatic core updates.
 368               *
 369               * @since 3.7.0
 370               *
 371               * @param bool $upgrade_minor Whether to enable minor automatic core updates.
 372               */
 373              return apply_filters( 'allow_minor_auto_core_updates', $upgrade_minor );
 374          }
 375  
 376          // 5: Major version updates (3.7.0 -> 3.8.0 -> 3.9.1).
 377          if ( version_compare( $new_branch, $current_branch, '>' ) ) {
 378  
 379              /**
 380               * Filters whether to enable major automatic core updates.
 381               *
 382               * @since 3.7.0
 383               *
 384               * @param bool $upgrade_major Whether to enable major automatic core updates.
 385               */
 386              return apply_filters( 'allow_major_auto_core_updates', $upgrade_major );
 387          }
 388  
 389          // If we're not sure, we don't want it.
 390          return false;
 391      }
 392  
 393      /**
 394       * Compares the disk file checksums against the expected checksums.
 395       *
 396       * @since 3.7.0
 397       *
 398       * @global string $wp_version       The WordPress version string.
 399       * @global string $wp_local_package Locale code of the package.
 400       *
 401       * @return bool True if the checksums match, otherwise false.
 402       */
 403  	public function check_files() {
 404          global $wp_version, $wp_local_package;
 405  
 406          $checksums = get_core_checksums( $wp_version, isset( $wp_local_package ) ? $wp_local_package : 'en_US' );
 407  
 408          if ( ! is_array( $checksums ) ) {
 409              return false;
 410          }
 411  
 412          foreach ( $checksums as $file => $checksum ) {
 413              // Skip files which get updated.
 414              if ( str_starts_with( $file, 'wp-content' ) ) {
 415                  continue;
 416              }
 417              if ( ! file_exists( ABSPATH . $file ) || md5_file( ABSPATH . $file ) !== $checksum ) {
 418                  return false;
 419              }
 420          }
 421  
 422          return true;
 423      }
 424  }


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