416 lines
14 KiB
PHP
416 lines
14 KiB
PHP
<?php
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/**
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* Upgrade API: Core_Upgrader class
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*
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* @package WordPress
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* @subpackage Upgrader
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* @since 4.6.0
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*/
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/**
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* Core class used for updating core.
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*
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* It allows for WordPress to upgrade itself in combination with
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* the wp-admin/includes/update-core.php file.
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*
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* @since 2.8.0
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* @since 4.6.0 Moved to its own file from wp-admin/includes/class-wp-upgrader.php.
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*
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* @see WP_Upgrader
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*/
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class Core_Upgrader extends WP_Upgrader {
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/**
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* Initialize the upgrade strings.
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*
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* @since 2.8.0
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*/
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public function upgrade_strings() {
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$this->strings['up_to_date'] = __( 'WordPress is at the latest version.' );
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$this->strings['locked'] = __( 'Another update is currently in progress.' );
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$this->strings['no_package'] = __( 'Update package not available.' );
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/* translators: %s: Package URL. */
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$this->strings['downloading_package'] = sprintf( __( 'Downloading update from %s…' ), '<span class="code">%s</span>' );
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$this->strings['unpack_package'] = __( 'Unpacking the update…' );
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$this->strings['copy_failed'] = __( 'Could not copy files.' );
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$this->strings['copy_failed_space'] = __( 'Could not copy files. You may have run out of disk space.' );
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$this->strings['start_rollback'] = __( 'Attempting to roll back to previous version.' );
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$this->strings['rollback_was_required'] = __( 'Due to an error during updating, WordPress has rolled back to your previous version.' );
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}
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/**
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* Upgrade WordPress core.
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*
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* @since 2.8.0
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*
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* @global WP_Filesystem_Base $wp_filesystem WordPress filesystem subclass.
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* @global callable $_wp_filesystem_direct_method
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*
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* @param object $current Response object for whether WordPress is current.
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* @param array $args {
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* Optional. Arguments for upgrading WordPress core. Default empty array.
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*
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* @type bool $pre_check_md5 Whether to check the file checksums before
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* attempting the upgrade. Default true.
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* @type bool $attempt_rollback Whether to attempt to rollback the chances if
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* there is a problem. Default false.
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* @type bool $do_rollback Whether to perform this "upgrade" as a rollback.
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* Default false.
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* }
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* @return string|false|WP_Error New WordPress version on success, false or WP_Error on failure.
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*/
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public function upgrade( $current, $args = array() ) {
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global $wp_filesystem;
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require ABSPATH . WPINC . '/version.php'; // $wp_version;
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$start_time = time();
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$defaults = array(
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'pre_check_md5' => true,
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'attempt_rollback' => false,
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'do_rollback' => false,
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'allow_relaxed_file_ownership' => false,
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);
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$parsed_args = wp_parse_args( $args, $defaults );
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$this->init();
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$this->upgrade_strings();
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// Is an update available?
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if ( ! isset( $current->response ) || $current->response == 'latest' ) {
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return new WP_Error( 'up_to_date', $this->strings['up_to_date'] );
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}
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$res = $this->fs_connect( array( ABSPATH, WP_CONTENT_DIR ), $parsed_args['allow_relaxed_file_ownership'] );
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if ( ! $res || is_wp_error( $res ) ) {
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return $res;
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}
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$wp_dir = trailingslashit( $wp_filesystem->abspath() );
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$partial = true;
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if ( $parsed_args['do_rollback'] ) {
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$partial = false;
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} elseif ( $parsed_args['pre_check_md5'] && ! $this->check_files() ) {
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$partial = false;
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}
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/*
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* If partial update is returned from the API, use that, unless we're doing
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* a reinstallation. If we cross the new_bundled version number, then use
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* the new_bundled zip. Don't though if the constant is set to skip bundled items.
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* If the API returns a no_content zip, go with it. Finally, default to the full zip.
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*/
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if ( $parsed_args['do_rollback'] && $current->packages->rollback ) {
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$to_download = 'rollback';
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} elseif ( $current->packages->partial && 'reinstall' != $current->response && $wp_version == $current->partial_version && $partial ) {
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$to_download = 'partial';
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} elseif ( $current->packages->new_bundled && version_compare( $wp_version, $current->new_bundled, '<' )
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&& ( ! defined( 'CORE_UPGRADE_SKIP_NEW_BUNDLED' ) || ! CORE_UPGRADE_SKIP_NEW_BUNDLED ) ) {
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$to_download = 'new_bundled';
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} elseif ( $current->packages->no_content ) {
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$to_download = 'no_content';
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} else {
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$to_download = 'full';
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}
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// Lock to prevent multiple Core Updates occurring.
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$lock = WP_Upgrader::create_lock( 'core_updater', 15 * MINUTE_IN_SECONDS );
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if ( ! $lock ) {
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return new WP_Error( 'locked', $this->strings['locked'] );
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}
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$download = $this->download_package( $current->packages->$to_download, true );
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// Allow for signature soft-fail.
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// WARNING: This may be removed in the future.
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if ( is_wp_error( $download ) && $download->get_error_data( 'softfail-filename' ) ) {
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// Outout the failure error as a normal feedback, and not as an error:
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/** This filter is documented in wp-admin/includes/update-core.php */
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apply_filters( 'update_feedback', $download->get_error_message() );
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// Report this failure back to WordPress.org for debugging purposes.
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wp_version_check(
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array(
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'signature_failure_code' => $download->get_error_code(),
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'signature_failure_data' => $download->get_error_data(),
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)
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);
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// Pretend this error didn't happen.
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$download = $download->get_error_data( 'softfail-filename' );
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}
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if ( is_wp_error( $download ) ) {
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WP_Upgrader::release_lock( 'core_updater' );
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return $download;
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}
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$working_dir = $this->unpack_package( $download );
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if ( is_wp_error( $working_dir ) ) {
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WP_Upgrader::release_lock( 'core_updater' );
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return $working_dir;
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}
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// Copy update-core.php from the new version into place.
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if ( ! $wp_filesystem->copy( $working_dir . '/wordpress/wp-admin/includes/update-core.php', $wp_dir . 'wp-admin/includes/update-core.php', true ) ) {
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$wp_filesystem->delete( $working_dir, true );
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WP_Upgrader::release_lock( 'core_updater' );
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return new WP_Error( 'copy_failed_for_update_core_file', __( 'The update cannot be installed because we will be unable to copy some files. This is usually due to inconsistent file permissions.' ), 'wp-admin/includes/update-core.php' );
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}
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$wp_filesystem->chmod( $wp_dir . 'wp-admin/includes/update-core.php', FS_CHMOD_FILE );
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require_once ABSPATH . 'wp-admin/includes/update-core.php';
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if ( ! function_exists( 'update_core' ) ) {
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WP_Upgrader::release_lock( 'core_updater' );
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return new WP_Error( 'copy_failed_space', $this->strings['copy_failed_space'] );
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}
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$result = update_core( $working_dir, $wp_dir );
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// In the event of an issue, we may be able to roll back.
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if ( $parsed_args['attempt_rollback'] && $current->packages->rollback && ! $parsed_args['do_rollback'] ) {
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$try_rollback = false;
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if ( is_wp_error( $result ) ) {
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$error_code = $result->get_error_code();
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/*
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* Not all errors are equal. These codes are critical: copy_failed__copy_dir,
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* mkdir_failed__copy_dir, copy_failed__copy_dir_retry, and disk_full.
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* do_rollback allows for update_core() to trigger a rollback if needed.
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*/
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if ( false !== strpos( $error_code, 'do_rollback' ) ) {
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$try_rollback = true;
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} elseif ( false !== strpos( $error_code, '__copy_dir' ) ) {
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$try_rollback = true;
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} elseif ( 'disk_full' === $error_code ) {
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$try_rollback = true;
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}
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}
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if ( $try_rollback ) {
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/** This filter is documented in wp-admin/includes/update-core.php */
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apply_filters( 'update_feedback', $result );
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/** This filter is documented in wp-admin/includes/update-core.php */
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apply_filters( 'update_feedback', $this->strings['start_rollback'] );
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$rollback_result = $this->upgrade( $current, array_merge( $parsed_args, array( 'do_rollback' => true ) ) );
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$original_result = $result;
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$result = new WP_Error(
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'rollback_was_required',
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$this->strings['rollback_was_required'],
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(object) array(
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'update' => $original_result,
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'rollback' => $rollback_result,
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)
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);
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}
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}
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/** This action is documented in wp-admin/includes/class-wp-upgrader.php */
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do_action(
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'upgrader_process_complete',
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$this,
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array(
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'action' => 'update',
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'type' => 'core',
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)
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);
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// Clear the current updates.
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delete_site_transient( 'update_core' );
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if ( ! $parsed_args['do_rollback'] ) {
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$stats = array(
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'update_type' => $current->response,
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'success' => true,
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'fs_method' => $wp_filesystem->method,
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'fs_method_forced' => defined( 'FS_METHOD' ) || has_filter( 'filesystem_method' ),
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'fs_method_direct' => ! empty( $GLOBALS['_wp_filesystem_direct_method'] ) ? $GLOBALS['_wp_filesystem_direct_method'] : '',
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'time_taken' => time() - $start_time,
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'reported' => $wp_version,
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'attempted' => $current->version,
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);
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if ( is_wp_error( $result ) ) {
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$stats['success'] = false;
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// Did a rollback occur?
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if ( ! empty( $try_rollback ) ) {
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$stats['error_code'] = $original_result->get_error_code();
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$stats['error_data'] = $original_result->get_error_data();
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// Was the rollback successful? If not, collect its error too.
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$stats['rollback'] = ! is_wp_error( $rollback_result );
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if ( is_wp_error( $rollback_result ) ) {
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$stats['rollback_code'] = $rollback_result->get_error_code();
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$stats['rollback_data'] = $rollback_result->get_error_data();
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}
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} else {
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$stats['error_code'] = $result->get_error_code();
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$stats['error_data'] = $result->get_error_data();
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}
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}
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wp_version_check( $stats );
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}
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WP_Upgrader::release_lock( 'core_updater' );
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return $result;
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}
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/**
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* Determines if this WordPress Core version should update to an offered version or not.
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*
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* @since 3.7.0
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*
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* @param string $offered_ver The offered version, of the format x.y.z.
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* @return bool True if we should update to the offered version, otherwise false.
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*/
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public static function should_update_to_version( $offered_ver ) {
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require ABSPATH . WPINC . '/version.php'; // $wp_version; // x.y.z
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$current_branch = implode( '.', array_slice( preg_split( '/[.-]/', $wp_version ), 0, 2 ) ); // x.y
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$new_branch = implode( '.', array_slice( preg_split( '/[.-]/', $offered_ver ), 0, 2 ) ); // x.y
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$current_is_development_version = (bool) strpos( $wp_version, '-' );
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// Defaults:
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$upgrade_dev = true;
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$upgrade_minor = true;
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$upgrade_major = false;
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// WP_AUTO_UPDATE_CORE = true (all), 'minor', false.
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if ( defined( 'WP_AUTO_UPDATE_CORE' ) ) {
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if ( false === WP_AUTO_UPDATE_CORE ) {
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// Defaults to turned off, unless a filter allows it.
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$upgrade_dev = false;
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$upgrade_minor = false;
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$upgrade_major = false;
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} elseif ( true === WP_AUTO_UPDATE_CORE ) {
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// ALL updates for core.
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$upgrade_dev = true;
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$upgrade_minor = true;
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$upgrade_major = true;
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} elseif ( 'minor' === WP_AUTO_UPDATE_CORE ) {
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// Only minor updates for core.
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$upgrade_dev = false;
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$upgrade_minor = true;
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$upgrade_major = false;
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}
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}
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// 1: If we're already on that version, not much point in updating?
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if ( $offered_ver == $wp_version ) {
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return false;
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}
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// 2: If we're running a newer version, that's a nope.
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if ( version_compare( $wp_version, $offered_ver, '>' ) ) {
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return false;
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}
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$failure_data = get_site_option( 'auto_core_update_failed' );
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if ( $failure_data ) {
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// If this was a critical update failure, cannot update.
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if ( ! empty( $failure_data['critical'] ) ) {
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return false;
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}
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// Don't claim we can update on update-core.php if we have a non-critical failure logged.
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if ( $wp_version == $failure_data['current'] && false !== strpos( $offered_ver, '.1.next.minor' ) ) {
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return false;
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}
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/*
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* Cannot update if we're retrying the same A to B update that caused a non-critical failure.
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* Some non-critical failures do allow retries, like download_failed.
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* 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.
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*/
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if ( empty( $failure_data['retry'] ) && $wp_version == $failure_data['current'] && $offered_ver == $failure_data['attempted'] ) {
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return false;
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}
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}
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// 3: 3.7-alpha-25000 -> 3.7-alpha-25678 -> 3.7-beta1 -> 3.7-beta2.
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if ( $current_is_development_version ) {
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/**
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* Filters whether to enable automatic core updates for development versions.
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*
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* @since 3.7.0
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*
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* @param bool $upgrade_dev Whether to enable automatic updates for
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* development versions.
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*/
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if ( ! apply_filters( 'allow_dev_auto_core_updates', $upgrade_dev ) ) {
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return false;
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}
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// Else fall through to minor + major branches below.
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}
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// 4: Minor in-branch updates (3.7.0 -> 3.7.1 -> 3.7.2 -> 3.7.4).
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if ( $current_branch == $new_branch ) {
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/**
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* Filters whether to enable minor automatic core updates.
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*
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* @since 3.7.0
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*
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* @param bool $upgrade_minor Whether to enable minor automatic core updates.
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*/
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return apply_filters( 'allow_minor_auto_core_updates', $upgrade_minor );
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}
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// 5: Major version updates (3.7.0 -> 3.8.0 -> 3.9.1).
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if ( version_compare( $new_branch, $current_branch, '>' ) ) {
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/**
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* Filters whether to enable major automatic core updates.
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*
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* @since 3.7.0
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*
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* @param bool $upgrade_major Whether to enable major automatic core updates.
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*/
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return apply_filters( 'allow_major_auto_core_updates', $upgrade_major );
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}
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// If we're not sure, we don't want it.
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return false;
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}
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/**
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* Compare the disk file checksums against the expected checksums.
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*
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* @since 3.7.0
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*
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* @global string $wp_version
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* @global string $wp_local_package
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*
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* @return bool True if the checksums match, otherwise false.
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*/
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public function check_files() {
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global $wp_version, $wp_local_package;
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$checksums = get_core_checksums( $wp_version, isset( $wp_local_package ) ? $wp_local_package : 'en_US' );
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if ( ! is_array( $checksums ) ) {
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return false;
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}
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foreach ( $checksums as $file => $checksum ) {
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// Skip files which get updated.
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if ( 'wp-content' == substr( $file, 0, 10 ) ) {
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continue;
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}
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if ( ! file_exists( ABSPATH . $file ) || md5_file( ABSPATH . $file ) !== $checksum ) {
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return false;
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}
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}
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return true;
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}
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}
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