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Edit File : class-wp-upgrader.php \| Size : 46.88 KB
<?php /** * Upgrade API: WP_Upgrader class * * Requires skin classes and WP_Upgrader subclasses for backward compatibility. * * @package WordPress * @subpackage Upgrader * @since 2.8.0 / /* WP_Upgrader_Skin class / require_once ABSPATH . 'wp-admin/includes/class-wp-upgrader-skin.php'; /* Plugin_Upgrader_Skin class / require_once ABSPATH . 'wp-admin/includes/class-plugin-upgrader-skin.php'; /* Theme_Upgrader_Skin class / require_once ABSPATH . 'wp-admin/includes/class-theme-upgrader-skin.php'; /* Bulk_Upgrader_Skin class / require_once ABSPATH . 'wp-admin/includes/class-bulk-upgrader-skin.php'; /* Bulk_Plugin_Upgrader_Skin class / require_once ABSPATH . 'wp-admin/includes/class-bulk-plugin-upgrader-skin.php'; /* Bulk_Theme_Upgrader_Skin class / require_once ABSPATH . 'wp-admin/includes/class-bulk-theme-upgrader-skin.php'; /* Plugin_Installer_Skin class / require_once ABSPATH . 'wp-admin/includes/class-plugin-installer-skin.php'; /* Theme_Installer_Skin class / require_once ABSPATH . 'wp-admin/includes/class-theme-installer-skin.php'; /* Language_Pack_Upgrader_Skin class / require_once ABSPATH . 'wp-admin/includes/class-language-pack-upgrader-skin.php'; /* Automatic_Upgrader_Skin class / require_once ABSPATH . 'wp-admin/includes/class-automatic-upgrader-skin.php'; /* WP_Ajax_Upgrader_Skin class / require_once ABSPATH . 'wp-admin/includes/class-wp-ajax-upgrader-skin.php'; /* * Core class used for upgrading/installing a local set of files via * the Filesystem Abstraction classes from a Zip file. * * @since 2.8.0 / #[AllowDynamicProperties] class WP_Upgrader { /* * The error/notification strings used to update the user on the progress. * * @since 2.8.0 * @var array $strings / public $strings = array(); /* * The upgrader skin being used. * * @since 2.8.0 * @var Automatic_Upgrader_Skin\|WP_Upgrader_Skin $skin / public $skin = null; /* * The result of the installation. * * This is set by WP_Upgrader::install_package(), only when the package is installed * successfully. It will then be an array, unless a WP_Error is returned by the * {@see 'upgrader_post_install'} filter. In that case, the WP_Error will be assigned to * it. * * @since 2.8.0 * * @var array\|WP_Error $result { * @type string $source The full path to the source the files were installed from. * @type string $source_files List of all the files in the source directory. * @type string $destination The full path to the installation destination folder. * @type string $destination_name The name of the destination folder, or empty if `$destination` * and `$local_destination` are the same. * @type string $local_destination The full local path to the destination folder. This is usually * the same as `$destination`. * @type string $remote_destination The full remote path to the destination folder * (i.e., from `$wp_filesystem`). * @type bool $clear_destination Whether the destination folder was cleared. * } / public $result = array(); /* * The total number of updates being performed. * * Set by the bulk update methods. * * @since 3.0.0 * @var int $update_count / public $update_count = 0; /* * The current update if multiple updates are being performed. * * Used by the bulk update methods, and incremented for each update. * * @since 3.0.0 * @var int / public $update_current = 0; /* * Stores the list of plugins or themes added to temporary backup directory. * * Used by the rollback functions. * * @since 6.3.0 * @var array / private $temp_backups = array(); /* * Stores the list of plugins or themes to be restored from temporary backup directory. * * Used by the rollback functions. * * @since 6.3.0 * @var array / private $temp_restores = array(); /* * Construct the upgrader with a skin. * * @since 2.8.0 * * @param WP_Upgrader_Skin $skin The upgrader skin to use. Default is a WP_Upgrader_Skin * instance. / public function __construct( $skin = null ) { if ( null === $skin ) { $this->skin = new WP_Upgrader_Skin(); } else { $this->skin = $skin; } } /* * Initializes the upgrader. * * This will set the relationship between the skin being used and this upgrader, * and also add the generic strings to `WP_Upgrader::$strings`. * * Additionally, it will schedule a weekly task to clean up the temporary backup directory. * * @since 2.8.0 * @since 6.3.0 Added the `schedule_temp_backup_cleanup()` task. / public function init() { $this->skin->set_upgrader( $this ); $this->generic_strings(); if ( ! wp_installing() ) { $this->schedule_temp_backup_cleanup(); } } /* * Schedules the cleanup of the temporary backup directory. * * @since 6.3.0 / protected function schedule_temp_backup_cleanup() { if ( false === wp_next_scheduled( 'wp_delete_temp_updater_backups' ) ) { wp_schedule_event( time(), 'weekly', 'wp_delete_temp_updater_backups' ); } } /* * Adds the generic strings to WP_Upgrader::$strings. * * @since 2.8.0 / public function generic_strings() { $this->strings['bad_request'] = __( 'Invalid data provided.' ); $this->strings['fs_unavailable'] = __( 'Could not access filesystem.' ); $this->strings['fs_error'] = __( 'Filesystem error.' ); $this->strings['fs_no_root_dir'] = __( 'Unable to locate WordPress root directory.' ); / translators: %s: Directory name. / $this->strings['fs_no_content_dir'] = sprintf( __( 'Unable to locate WordPress content directory (%s).' ), 'wp-content' ); $this->strings['fs_no_plugins_dir'] = __( 'Unable to locate WordPress plugin directory.' ); $this->strings['fs_no_themes_dir'] = __( 'Unable to locate WordPress theme directory.' ); / translators: %s: Directory name. / $this->strings['fs_no_folder'] = __( 'Unable to locate needed folder (%s).' ); $this->strings['no_package'] = __( 'Package not available.' ); $this->strings['download_failed'] = __( 'Download failed.' ); $this->strings['installing_package'] = __( 'Installing the latest version…' ); $this->strings['no_files'] = __( 'The package contains no files.' ); $this->strings['folder_exists'] = __( 'Destination folder already exists.' ); $this->strings['mkdir_failed'] = __( 'Could not create directory.' ); $this->strings['incompatible_archive'] = __( 'The package could not be installed.' ); $this->strings['files_not_writable'] = __( 'The update cannot be installed because some files could not be copied. This is usually due to inconsistent file permissions.' ); $this->strings['dir_not_readable'] = __( 'A directory could not be read.' ); $this->strings['maintenance_start'] = __( 'Enabling Maintenance mode…' ); $this->strings['maintenance_end'] = __( 'Disabling Maintenance mode…' ); / translators: %s: upgrade-temp-backup / $this->strings['temp_backup_mkdir_failed'] = sprintf( __( 'Could not create the %s directory.' ), 'upgrade-temp-backup' ); / translators: %s: upgrade-temp-backup / $this->strings['temp_backup_move_failed'] = sprintf( __( 'Could not move the old version to the %s directory.' ), 'upgrade-temp-backup' ); / translators: %s: The plugin or theme slug. / $this->strings['temp_backup_restore_failed'] = __( 'Could not restore the original version of %s.' ); / translators: %s: The plugin or theme slug. / $this->strings['temp_backup_delete_failed'] = __( 'Could not delete the temporary backup directory for %s.' ); } /* * Connects to the filesystem. * * @since 2.8.0 * * @global WP_Filesystem_Base $wp_filesystem WordPress filesystem subclass. * * @param string[] $directories Optional. Array of directories. If any of these do * not exist, a WP_Error object will be returned. * Default empty array. * @param bool $allow_relaxed_file_ownership Whether to allow relaxed file ownership. * Default false. * @return bool\|WP_Error True if able to connect, false or a WP_Error otherwise. / public function fs_connect( $directories = array(), $allow_relaxed_file_ownership = false ) { global $wp_filesystem; $credentials = $this->skin->request_filesystem_credentials( false, $directories[0], $allow_relaxed_file_ownership ); if ( false === $credentials ) { return false; } if ( ! WP_Filesystem( $credentials, $directories[0], $allow_relaxed_file_ownership ) ) { $error = true; if ( is_object( $wp_filesystem ) && $wp_filesystem->errors->has_errors() ) { $error = $wp_filesystem->errors; } // Failed to connect. Error and request again. $this->skin->request_filesystem_credentials( $error, $directories[0], $allow_relaxed_file_ownership ); return false; } if ( ! is_object( $wp_filesystem ) ) { return new WP_Error( 'fs_unavailable', $this->strings['fs_unavailable'] ); } if ( is_wp_error( $wp_filesystem->errors ) && $wp_filesystem->errors->has_errors() ) { return new WP_Error( 'fs_error', $this->strings['fs_error'], $wp_filesystem->errors ); } foreach ( (array) $directories as $dir ) { switch ( $dir ) { case ABSPATH: if ( ! $wp_filesystem->abspath() ) { return new WP_Error( 'fs_no_root_dir', $this->strings['fs_no_root_dir'] ); } break; case WP_CONTENT_DIR: if ( ! $wp_filesystem->wp_content_dir() ) { return new WP_Error( 'fs_no_content_dir', $this->strings['fs_no_content_dir'] ); } break; case WP_PLUGIN_DIR: if ( ! $wp_filesystem->wp_plugins_dir() ) { return new WP_Error( 'fs_no_plugins_dir', $this->strings['fs_no_plugins_dir'] ); } break; case get_theme_root(): if ( ! $wp_filesystem->wp_themes_dir() ) { return new WP_Error( 'fs_no_themes_dir', $this->strings['fs_no_themes_dir'] ); } break; default: if ( ! $wp_filesystem->find_folder( $dir ) ) { return new WP_Error( 'fs_no_folder', sprintf( $this->strings['fs_no_folder'], esc_html( basename( $dir ) ) ) ); } break; } } return true; } /* * Downloads a package. * * @since 2.8.0 * @since 5.2.0 Added the `$check_signatures` parameter. * @since 5.5.0 Added the `$hook_extra` parameter. * * @param string $package The URI of the package. If this is the full path to an * existing local file, it will be returned untouched. * @param bool $check_signatures Whether to validate file signatures. Default false. * @param array $hook_extra Extra arguments to pass to the filter hooks. Default empty array. * @return string\|WP_Error The full path to the downloaded package file, or a WP_Error object. / public function download_package( $package, $check_signatures = false, $hook_extra = array() ) { /* * Filters whether to return the package. * * @since 3.7.0 * @since 5.5.0 Added the `$hook_extra` parameter. * * @param bool $reply Whether to bail without returning the package. * Default false. * @param string $package The package file name. * @param WP_Upgrader $upgrader The WP_Upgrader instance. * @param array $hook_extra Extra arguments passed to hooked filters. / $reply = apply_filters( 'upgrader_pre_download', false, $package, $this, $hook_extra ); if ( false !== $reply ) { return $reply; } if ( ! preg_match( '!^(http\|https\|ftp)://!i', $package ) && file_exists( $package ) ) { // Local file or remote? return $package; // Must be a local file. } if ( empty( $package ) ) { return new WP_Error( 'no_package', $this->strings['no_package'] ); } $this->skin->feedback( 'downloading_package', $package ); $download_file = download_url( $package, 300, $check_signatures ); if ( is_wp_error( $download_file ) && ! $download_file->get_error_data( 'softfail-filename' ) ) { return new WP_Error( 'download_failed', $this->strings['download_failed'], $download_file->get_error_message() ); } return $download_file; } /* * Unpacks a compressed package file. * * @since 2.8.0 * * @global WP_Filesystem_Base $wp_filesystem WordPress filesystem subclass. * * @param string $package Full path to the package file. * @param bool $delete_package Optional. Whether to delete the package file after attempting * to unpack it. Default true. * @return string\|WP_Error The path to the unpacked contents, or a WP_Error on failure. / public function unpack_package( $package, $delete_package = true ) { global $wp_filesystem; $this->skin->feedback( 'unpack_package' ); if ( ! $wp_filesystem->wp_content_dir() ) { return new WP_Error( 'fs_no_content_dir', $this->strings['fs_no_content_dir'] ); } $upgrade_folder = $wp_filesystem->wp_content_dir() . 'upgrade/'; // Clean up contents of upgrade directory beforehand. $upgrade_files = $wp_filesystem->dirlist( $upgrade_folder ); if ( ! empty( $upgrade_files ) ) { foreach ( $upgrade_files as $file ) { $wp_filesystem->delete( $upgrade_folder . $file['name'], true ); } } // We need a working directory - strip off any .tmp or .zip suffixes. $working_dir = $upgrade_folder . basename( basename( $package, '.tmp' ), '.zip' ); // Clean up working directory. if ( $wp_filesystem->is_dir( $working_dir ) ) { $wp_filesystem->delete( $working_dir, true ); } // Unzip package to working directory. $result = unzip_file( $package, $working_dir ); // Once extracted, delete the package if required. if ( $delete_package ) { unlink( $package ); } if ( is_wp_error( $result ) ) { $wp_filesystem->delete( $working_dir, true ); if ( 'incompatible_archive' === $result->get_error_code() ) { return new WP_Error( 'incompatible_archive', $this->strings['incompatible_archive'], $result->get_error_data() ); } return $result; } return $working_dir; } /* * Flattens the results of WP_Filesystem_Base::dirlist() for iterating over. * * @since 4.9.0 * @access protected * * @param array $nested_files Array of files as returned by WP_Filesystem_Base::dirlist(). * @param string $path Relative path to prepend to child nodes. Optional. * @return array A flattened array of the $nested_files specified. / protected function flatten_dirlist( $nested_files, $path = '' ) { $files = array(); foreach ( $nested_files as $name => $details ) { $files[ $path . $name ] = $details; // Append children recursively. if ( ! empty( $details['files'] ) ) { $children = $this->flatten_dirlist( $details['files'], $path . $name . '/' ); // Merge keeping possible numeric keys, which array_merge() will reindex from 0..n. $files = $files + $children; } } return $files; } /* * Clears the directory where this item is going to be installed into. * * @since 4.3.0 * * @global WP_Filesystem_Base $wp_filesystem WordPress filesystem subclass. * * @param string $remote_destination The location on the remote filesystem to be cleared. * @return true\|WP_Error True upon success, WP_Error on failure. / public function clear_destination( $remote_destination ) { global $wp_filesystem; $files = $wp_filesystem->dirlist( $remote_destination, true, true ); // False indicates that the $remote_destination doesn't exist. if ( false === $files ) { return true; } // Flatten the file list to iterate over. $files = $this->flatten_dirlist( $files ); // Check all files are writable before attempting to clear the destination. $unwritable_files = array(); // Check writability. foreach ( $files as $filename => $file_details ) { if ( ! $wp_filesystem->is_writable( $remote_destination . $filename ) ) { // Attempt to alter permissions to allow writes and try again. $wp_filesystem->chmod( $remote_destination . $filename, ( 'd' === $file_details['type'] ? FS_CHMOD_DIR : FS_CHMOD_FILE ) ); if ( ! $wp_filesystem->is_writable( $remote_destination . $filename ) ) { $unwritable_files[] = $filename; } } } if ( ! empty( $unwritable_files ) ) { return new WP_Error( 'files_not_writable', $this->strings['files_not_writable'], implode( ', ', $unwritable_files ) ); } if ( ! $wp_filesystem->delete( $remote_destination, true ) ) { return new WP_Error( 'remove_old_failed', $this->strings['remove_old_failed'] ); } return true; } /* * Install a package. * * Copies the contents of a package from a source directory, and installs them in * a destination directory. Optionally removes the source. It can also optionally * clear out the destination folder if it already exists. * * @since 2.8.0 * @since 6.2.0 Use move_dir() instead of copy_dir() when possible. * * @global WP_Filesystem_Base $wp_filesystem WordPress filesystem subclass. * @global string[] $wp_theme_directories * * @param array\|string $args { * Optional. Array or string of arguments for installing a package. Default empty array. * * @type string $source Required path to the package source. Default empty. * @type string $destination Required path to a folder to install the package in. * Default empty. * @type bool $clear_destination Whether to delete any files already in the destination * folder. Default false. * @type bool $clear_working Whether to delete the files from the working directory * after copying them to the destination. Default false. * @type bool $abort_if_destination_exists Whether to abort the installation if * the destination folder already exists. Default true. * @type array $hook_extra Extra arguments to pass to the filter hooks called by * WP_Upgrader::install_package(). Default empty array. * } * * @return array\|WP_Error The result (also stored in `WP_Upgrader::$result`), or a WP_Error on failure. / public function install_package( $args = array() ) { global $wp_filesystem, $wp_theme_directories; $defaults = array( 'source' => '', // Please always pass this. 'destination' => '', // ...and this. 'clear_destination' => false, 'clear_working' => false, 'abort_if_destination_exists' => true, 'hook_extra' => array(), ); $args = wp_parse_args( $args, $defaults ); // These were previously extract()'d. $source = $args['source']; $destination = $args['destination']; $clear_destination = $args['clear_destination']; / * Give the upgrade an additional 300 seconds (5 minutes) to ensure the install * doesn't prematurely timeout having used up the maximum script execution time * upacking and downloading in WP_Upgrader->run(). / if ( function_exists( 'set_time_limit' ) ) { set_time_limit( 300 ); } if ( ( ! is_string( $source ) \|\| '' === $source \|\| trim( $source ) !== $source ) \|\| ( ! is_string( $destination ) \|\| '' === $destination \|\| trim( $destination ) !== $destination ) ) { return new WP_Error( 'bad_request', $this->strings['bad_request'] ); } $this->skin->feedback( 'installing_package' ); /* * Filters the installation response before the installation has started. * * Returning a value that could be evaluated as a `WP_Error` will effectively * short-circuit the installation, returning that value instead. * * @since 2.8.0 * * @param bool\|WP_Error $response Installation response. * @param array $hook_extra Extra arguments passed to hooked filters. / $res = apply_filters( 'upgrader_pre_install', true, $args['hook_extra'] ); if ( is_wp_error( $res ) ) { return $res; } // Retain the original source and destinations. $remote_source = $args['source']; $local_destination = $destination; $dirlist = $wp_filesystem->dirlist( $remote_source ); if ( false === $dirlist ) { return new WP_Error( 'source_read_failed', $this->strings['fs_error'], $this->strings['dir_not_readable'] ); } $source_files = array_keys( $dirlist ); $remote_destination = $wp_filesystem->find_folder( $local_destination ); // Locate which directory to copy to the new folder. This is based on the actual folder holding the files. if ( 1 === count( $source_files ) && $wp_filesystem->is_dir( trailingslashit( $args['source'] ) . $source_files[0] . '/' ) ) { // Only one folder? Then we want its contents. $source = trailingslashit( $args['source'] ) . trailingslashit( $source_files[0] ); } elseif ( 0 === count( $source_files ) ) { // There are no files? return new WP_Error( 'incompatible_archive_empty', $this->strings['incompatible_archive'], $this->strings['no_files'] ); } else { / * It's only a single file, the upgrader will use the folder name of this file as the destination folder. * Folder name is based on zip filename. / $source = trailingslashit( $args['source'] ); } /* * Filters the source file location for the upgrade package. * * @since 2.8.0 * @since 4.4.0 The $hook_extra parameter became available. * * @param string $source File source location. * @param string $remote_source Remote file source location. * @param WP_Upgrader $upgrader WP_Upgrader instance. * @param array $hook_extra Extra arguments passed to hooked filters. / $source = apply_filters( 'upgrader_source_selection', $source, $remote_source, $this, $args['hook_extra'] ); if ( is_wp_error( $source ) ) { return $source; } if ( ! empty( $args['hook_extra']['temp_backup'] ) ) { $temp_backup = $this->move_to_temp_backup_dir( $args['hook_extra']['temp_backup'] ); if ( is_wp_error( $temp_backup ) ) { return $temp_backup; } $this->temp_backups[] = $args['hook_extra']['temp_backup']; } // Has the source location changed? If so, we need a new source_files list. if ( $source !== $remote_source ) { $dirlist = $wp_filesystem->dirlist( $source ); if ( false === $dirlist ) { return new WP_Error( 'new_source_read_failed', $this->strings['fs_error'], $this->strings['dir_not_readable'] ); } $source_files = array_keys( $dirlist ); } / * Protection against deleting files in any important base directories. * Theme_Upgrader & Plugin_Upgrader also trigger this, as they pass the * destination directory (WP_PLUGIN_DIR / wp-content/themes) intending * to copy the directory into the directory, whilst they pass the source * as the actual files to copy. / $protected_directories = array( ABSPATH, WP_CONTENT_DIR, WP_PLUGIN_DIR, WP_CONTENT_DIR . '/themes' ); if ( is_array( $wp_theme_directories ) ) { $protected_directories = array_merge( $protected_directories, $wp_theme_directories ); } if ( in_array( $destination, $protected_directories, true ) ) { $remote_destination = trailingslashit( $remote_destination ) . trailingslashit( basename( $source ) ); $destination = trailingslashit( $destination ) . trailingslashit( basename( $source ) ); } if ( $clear_destination ) { // We're going to clear the destination if there's something there. $this->skin->feedback( 'remove_old' ); $removed = $this->clear_destination( $remote_destination ); /* * Filters whether the upgrader cleared the destination. * * @since 2.8.0 * * @param true\|WP_Error $removed Whether the destination was cleared. * True upon success, WP_Error on failure. * @param string $local_destination The local package destination. * @param string $remote_destination The remote package destination. * @param array $hook_extra Extra arguments passed to hooked filters. / $removed = apply_filters( 'upgrader_clear_destination', $removed, $local_destination, $remote_destination, $args['hook_extra'] ); if ( is_wp_error( $removed ) ) { return $removed; } } elseif ( $args['abort_if_destination_exists'] && $wp_filesystem->exists( $remote_destination ) ) { / * If we're not clearing the destination folder and something exists there already, bail. * But first check to see if there are actually any files in the folder. / $_files = $wp_filesystem->dirlist( $remote_destination ); if ( ! empty( $_files ) ) { $wp_filesystem->delete( $remote_source, true ); // Clear out the source files. return new WP_Error( 'folder_exists', $this->strings['folder_exists'], $remote_destination ); } } / * If 'clear_working' is false, the source should not be removed, so use copy_dir() instead. * * Partial updates, like language packs, may want to retain the destination. * If the destination exists or has contents, this may be a partial update, * and the destination should not be removed, so use copy_dir() instead. / if ( $args['clear_working'] && ( // Destination does not exist or has no contents. ! $wp_filesystem->exists( $remote_destination ) \|\| empty( $wp_filesystem->dirlist( $remote_destination ) ) ) ) { $result = move_dir( $source, $remote_destination, true ); } else { // Create destination if needed. if ( ! $wp_filesystem->exists( $remote_destination ) ) { if ( ! $wp_filesystem->mkdir( $remote_destination, FS_CHMOD_DIR ) ) { return new WP_Error( 'mkdir_failed_destination', $this->strings['mkdir_failed'], $remote_destination ); } } $result = copy_dir( $source, $remote_destination ); } // Clear the working directory? if ( $args['clear_working'] ) { $wp_filesystem->delete( $remote_source, true ); } if ( is_wp_error( $result ) ) { return $result; } $destination_name = basename( str_replace( $local_destination, '', $destination ) ); if ( '.' === $destination_name ) { $destination_name = ''; } $this->result = compact( 'source', 'source_files', 'destination', 'destination_name', 'local_destination', 'remote_destination', 'clear_destination' ); /* * Filters the installation response after the installation has finished. * * @since 2.8.0 * * @param bool $response Installation response. * @param array $hook_extra Extra arguments passed to hooked filters. * @param array $result Installation result data. / $res = apply_filters( 'upgrader_post_install', true, $args['hook_extra'], $this->result ); if ( is_wp_error( $res ) ) { $this->result = $res; return $res; } // Bombard the calling function will all the info which we've just used. return $this->result; } /* * Runs an upgrade/installation. * * Attempts to download the package (if it is not a local file), unpack it, and * install it in the destination folder. * * @since 2.8.0 * * @param array $options { * Array or string of arguments for upgrading/installing a package. * * @type string $package The full path or URI of the package to install. * Default empty. * @type string $destination The full path to the destination folder. * Default empty. * @type bool $clear_destination Whether to delete any files already in the * destination folder. Default false. * @type bool $clear_working Whether to delete the files from the working * directory after copying them to the destination. * Default true. * @type bool $abort_if_destination_exists Whether to abort the installation if the destination * folder already exists. When true, `$clear_destination` * should be false. Default true. * @type bool $is_multi Whether this run is one of multiple upgrade/installation * actions being performed in bulk. When true, the skin * WP_Upgrader::header() and WP_Upgrader::footer() * aren't called. Default false. * @type array $hook_extra Extra arguments to pass to the filter hooks called by * WP_Upgrader::run(). * } * @return array\|false\|WP_Error The result from self::install_package() on success, otherwise a WP_Error, * or false if unable to connect to the filesystem. / public function run( $options ) { $defaults = array( 'package' => '', // Please always pass this. 'destination' => '', // ...and this. 'clear_destination' => false, 'clear_working' => true, 'abort_if_destination_exists' => true, // Abort if the destination directory exists. Pass clear_destination as false please. 'is_multi' => false, 'hook_extra' => array(), // Pass any extra $hook_extra args here, this will be passed to any hooked filters. ); $options = wp_parse_args( $options, $defaults ); /* * Filters the package options before running an update. * * See also {@see 'upgrader_process_complete'}. * * @since 4.3.0 * * @param array $options { * Options used by the upgrader. * * @type string $package Package for update. * @type string $destination Update location. * @type bool $clear_destination Clear the destination resource. * @type bool $clear_working Clear the working resource. * @type bool $abort_if_destination_exists Abort if the Destination directory exists. * @type bool $is_multi Whether the upgrader is running multiple times. * @type array $hook_extra { * Extra hook arguments. * * @type string $action Type of action. Default 'update'. * @type string $type Type of update process. Accepts 'plugin', 'theme', or 'core'. * @type bool $bulk Whether the update process is a bulk update. Default true. * @type string $plugin Path to the plugin file relative to the plugins directory. * @type string $theme The stylesheet or template name of the theme. * @type string $language_update_type The language pack update type. Accepts 'plugin', 'theme', * or 'core'. * @type object $language_update The language pack update offer. * } * } / $options = apply_filters( 'upgrader_package_options', $options ); if ( ! $options['is_multi'] ) { // Call $this->header separately if running multiple times. $this->skin->header(); } // Connect to the filesystem first. $res = $this->fs_connect( array( WP_CONTENT_DIR, $options['destination'] ) ); // Mainly for non-connected filesystem. if ( ! $res ) { if ( ! $options['is_multi'] ) { $this->skin->footer(); } return false; } $this->skin->before(); if ( is_wp_error( $res ) ) { $this->skin->error( $res ); $this->skin->after(); if ( ! $options['is_multi'] ) { $this->skin->footer(); } return $res; } / * Download the package. Note: If the package is the full path * to an existing local file, it will be returned untouched. / $download = $this->download_package( $options['package'], false, $options['hook_extra'] ); / * Allow for signature soft-fail. * WARNING: This may be removed in the future. / if ( is_wp_error( $download ) && $download->get_error_data( 'softfail-filename' ) ) { // Don't output the 'no signature could be found' failure message for now. if ( 'signature_verification_no_signature' !== $download->get_error_code() \|\| WP_DEBUG ) { // Output the failure error as a normal feedback, and not as an error. $this->skin->feedback( $download->get_error_message() ); // Report this failure back to WordPress.org for debugging purposes. wp_version_check( array( 'signature_failure_code' => $download->get_error_code(), 'signature_failure_data' => $download->get_error_data(), ) ); } // Pretend this error didn't happen. $download = $download->get_error_data( 'softfail-filename' ); } if ( is_wp_error( $download ) ) { $this->skin->error( $download ); $this->skin->after(); if ( ! $options['is_multi'] ) { $this->skin->footer(); } return $download; } $delete_package = ( $download !== $options['package'] ); // Do not delete a "local" file. // Unzips the file into a temporary directory. $working_dir = $this->unpack_package( $download, $delete_package ); if ( is_wp_error( $working_dir ) ) { $this->skin->error( $working_dir ); $this->skin->after(); if ( ! $options['is_multi'] ) { $this->skin->footer(); } return $working_dir; } // With the given options, this installs it to the destination directory. $result = $this->install_package( array( 'source' => $working_dir, 'destination' => $options['destination'], 'clear_destination' => $options['clear_destination'], 'abort_if_destination_exists' => $options['abort_if_destination_exists'], 'clear_working' => $options['clear_working'], 'hook_extra' => $options['hook_extra'], ) ); /* * Filters the result of WP_Upgrader::install_package(). * * @since 5.7.0 * * @param array\|WP_Error $result Result from WP_Upgrader::install_package(). * @param array $hook_extra Extra arguments passed to hooked filters. / $result = apply_filters( 'upgrader_install_package_result', $result, $options['hook_extra'] ); $this->skin->set_result( $result ); if ( is_wp_error( $result ) ) { // An automatic plugin update will have already performed its rollback. if ( ! empty( $options['hook_extra']['temp_backup'] ) ) { $this->temp_restores[] = $options['hook_extra']['temp_backup']; / * Restore the backup on shutdown. * Actions running on `shutdown` are immune to PHP timeouts, * so in case the failure was due to a PHP timeout, * it will still be able to properly restore the previous version. * * Zero arguments are accepted as a string can sometimes be passed * internally during actions, causing an error because * `WP_Upgrader::restore_temp_backup()` expects an array. / add_action( 'shutdown', array( $this, 'restore_temp_backup' ), 10, 0 ); } $this->skin->error( $result ); if ( ! method_exists( $this->skin, 'hide_process_failed' ) \|\| ! $this->skin->hide_process_failed( $result ) ) { $this->skin->feedback( 'process_failed' ); } } else { // Installation succeeded. $this->skin->feedback( 'process_success' ); } $this->skin->after(); // Clean up the backup kept in the temporary backup directory. if ( ! empty( $options['hook_extra']['temp_backup'] ) ) { // Delete the backup on `shutdown` to avoid a PHP timeout. add_action( 'shutdown', array( $this, 'delete_temp_backup' ), 100, 0 ); } if ( ! $options['is_multi'] ) { /* * Fires when the upgrader process is complete. * * See also {@see 'upgrader_package_options'}. * * @since 3.6.0 * @since 3.7.0 Added to WP_Upgrader::run(). * @since 4.6.0 `$translations` was added as a possible argument to `$hook_extra`. * * @param WP_Upgrader $upgrader WP_Upgrader instance. In other contexts this might be a * Theme_Upgrader, Plugin_Upgrader, Core_Upgrade, or Language_Pack_Upgrader instance. * @param array $hook_extra { * Array of bulk item update data. * * @type string $action Type of action. Default 'update'. * @type string $type Type of update process. Accepts 'plugin', 'theme', 'translation', or 'core'. * @type bool $bulk Whether the update process is a bulk update. Default true. * @type array $plugins Array of the basename paths of the plugins' main files. * @type array $themes The theme slugs. * @type array $translations { * Array of translations update data. * * @type string $language The locale the translation is for. * @type string $type Type of translation. Accepts 'plugin', 'theme', or 'core'. * @type string $slug Text domain the translation is for. The slug of a theme/plugin or * 'default' for core translations. * @type string $version The version of a theme, plugin, or core. * } * } / do_action( 'upgrader_process_complete', $this, $options['hook_extra'] ); $this->skin->footer(); } return $result; } /* * Toggles maintenance mode for the site. * * Creates/deletes the maintenance file to enable/disable maintenance mode. * * @since 2.8.0 * * @global WP_Filesystem_Base $wp_filesystem WordPress filesystem subclass. * * @param bool $enable True to enable maintenance mode, false to disable. / public function maintenance_mode( $enable = false ) { global $wp_filesystem; if ( ! $wp_filesystem ) { if ( ! function_exists( 'WP_Filesystem' ) ) { require_once ABSPATH . 'wp-admin/includes/file.php'; } ob_start(); $credentials = request_filesystem_credentials( '' ); ob_end_clean(); if ( false === $credentials \|\| ! WP_Filesystem( $credentials ) ) { wp_trigger_error( __FUNCTION__, __( 'Could not access filesystem.' ) ); return; } } $file = $wp_filesystem->abspath() . '.maintenance'; if ( $enable ) { if ( ! wp_doing_cron() ) { $this->skin->feedback( 'maintenance_start' ); } // Create maintenance file to signal that we are upgrading. $maintenance_string = '<?php $upgrading = ' . time() . '; ?>'; $wp_filesystem->delete( $file ); $wp_filesystem->put_contents( $file, $maintenance_string, FS_CHMOD_FILE ); } elseif ( ! $enable && $wp_filesystem->exists( $file ) ) { if ( ! wp_doing_cron() ) { $this->skin->feedback( 'maintenance_end' ); } $wp_filesystem->delete( $file ); } } /* * Creates a lock using WordPress options. * * @since 4.5.0 * * @global wpdb $wpdb The WordPress database abstraction object. * * @param string $lock_name The name of this unique lock. * @param int $release_timeout Optional. The duration in seconds to respect an existing lock. * Default: 1 hour. * @return bool False if a lock couldn't be created or if the lock is still valid. True otherwise. / public static function create_lock( $lock_name, $release_timeout = null ) { global $wpdb; if ( ! $release_timeout ) { $release_timeout = HOUR_IN_SECONDS; } $lock_option = $lock_name . '.lock'; // Try to lock. $lock_result = $wpdb->query( $wpdb->prepare( "INSERT IGNORE INTO `$wpdb->options` ( `option_name`, `option_value`, `autoload` ) VALUES (%s, %s, 'off') / LOCK /", $lock_option, time() ) ); if ( ! $lock_result ) { $lock_result = get_option( $lock_option ); // If a lock couldn't be created, and there isn't a lock, bail. if ( ! $lock_result ) { return false; } // Check to see if the lock is still valid. If it is, bail. if ( $lock_result > ( time() - $release_timeout ) ) { return false; } // There must exist an expired lock, clear it and re-gain it. WP_Upgrader::release_lock( $lock_name ); return WP_Upgrader::create_lock( $lock_name, $release_timeout ); } // Update the lock, as by this point we've definitely got a lock, just need to fire the actions. update_option( $lock_option, time(), false ); return true; } /* * Releases an upgrader lock. * * @since 4.5.0 * * @see WP_Upgrader::create_lock() * * @param string $lock_name The name of this unique lock. * @return bool True if the lock was successfully released. False on failure. / public static function release_lock( $lock_name ) { return delete_option( $lock_name . '.lock' ); } /* * Moves the plugin or theme being updated into a temporary backup directory. * * @since 6.3.0 * * @global WP_Filesystem_Base $wp_filesystem WordPress filesystem subclass. * * @param string[] $args { * Array of data for the temporary backup. * * @type string $slug Plugin or theme slug. * @type string $src Path to the root directory for plugins or themes. * @type string $dir Destination subdirectory name. Accepts 'plugins' or 'themes'. * } * * @return bool\|WP_Error True on success, false on early exit, otherwise WP_Error. / public function move_to_temp_backup_dir( $args ) { global $wp_filesystem; if ( empty( $args['slug'] ) \|\| empty( $args['src'] ) \|\| empty( $args['dir'] ) ) { return false; } / * Skip any plugin that has "." as its slug. * A slug of "." will result in a `$src` value ending in a period. * * On Windows, this will cause the 'plugins' folder to be moved, * and will cause a failure when attempting to call `mkdir()`. / if ( '.' === $args['slug'] ) { return false; } if ( ! $wp_filesystem->wp_content_dir() ) { return new WP_Error( 'fs_no_content_dir', $this->strings['fs_no_content_dir'] ); } $dest_dir = $wp_filesystem->wp_content_dir() . 'upgrade-temp-backup/'; $sub_dir = $dest_dir . $args['dir'] . '/'; // Create the temporary backup directory if it does not exist. if ( ! $wp_filesystem->is_dir( $sub_dir ) ) { if ( ! $wp_filesystem->is_dir( $dest_dir ) ) { $wp_filesystem->mkdir( $dest_dir, FS_CHMOD_DIR ); } if ( ! $wp_filesystem->mkdir( $sub_dir, FS_CHMOD_DIR ) ) { // Could not create the backup directory. return new WP_Error( 'fs_temp_backup_mkdir', $this->strings['temp_backup_mkdir_failed'] ); } } $src_dir = $wp_filesystem->find_folder( $args['src'] ); $src = trailingslashit( $src_dir ) . $args['slug']; $dest = $dest_dir . trailingslashit( $args['dir'] ) . $args['slug']; // Delete the temporary backup directory if it already exists. if ( $wp_filesystem->is_dir( $dest ) ) { $wp_filesystem->delete( $dest, true ); } // Move to the temporary backup directory. $result = move_dir( $src, $dest, true ); if ( is_wp_error( $result ) ) { return new WP_Error( 'fs_temp_backup_move', $this->strings['temp_backup_move_failed'] ); } return true; } /* * Restores the plugin or theme from temporary backup. * * @since 6.3.0 * @since 6.6.0 Added the `$temp_backups` parameter. * * @global WP_Filesystem_Base $wp_filesystem WordPress filesystem subclass. * * @param array[] $temp_backups { * Optional. An array of temporary backups. * * @type array ...$0 { * Information about the backup. * * @type string $dir The temporary backup location in the upgrade-temp-backup directory. * @type string $slug The item's slug. * @type string $src The directory where the original is stored. For example, `WP_PLUGIN_DIR`. * } * } * @return bool\|WP_Error True on success, false on early exit, otherwise WP_Error. / public function restore_temp_backup( array $temp_backups = array() ) { global $wp_filesystem; $errors = new WP_Error(); if ( empty( $temp_backups ) ) { $temp_backups = $this->temp_restores; } foreach ( $temp_backups as $args ) { if ( empty( $args['slug'] ) \|\| empty( $args['src'] ) \|\| empty( $args['dir'] ) ) { return false; } if ( ! $wp_filesystem->wp_content_dir() ) { $errors->add( 'fs_no_content_dir', $this->strings['fs_no_content_dir'] ); return $errors; } $src = $wp_filesystem->wp_content_dir() . 'upgrade-temp-backup/' . $args['dir'] . '/' . $args['slug']; $dest_dir = $wp_filesystem->find_folder( $args['src'] ); $dest = trailingslashit( $dest_dir ) . $args['slug']; if ( $wp_filesystem->is_dir( $src ) ) { // Cleanup. if ( $wp_filesystem->is_dir( $dest ) && ! $wp_filesystem->delete( $dest, true ) ) { $errors->add( 'fs_temp_backup_delete', sprintf( $this->strings['temp_backup_restore_failed'], $args['slug'] ) ); continue; } // Move it. $result = move_dir( $src, $dest, true ); if ( is_wp_error( $result ) ) { $errors->add( 'fs_temp_backup_delete', sprintf( $this->strings['temp_backup_restore_failed'], $args['slug'] ) ); continue; } } } return $errors->has_errors() ? $errors : true; } /* * Deletes a temporary backup. * * @since 6.3.0 * @since 6.6.0 Added the `$temp_backups` parameter. * * @global WP_Filesystem_Base $wp_filesystem WordPress filesystem subclass. * * @param array[] $temp_backups { * Optional. An array of temporary backups. * * @type array ...$0 { * Information about the backup. * * @type string $dir The temporary backup location in the upgrade-temp-backup directory. * @type string $slug The item's slug. * @type string $src The directory where the original is stored. For example, `WP_PLUGIN_DIR`. * } * } * @return bool\|WP_Error True on success, false on early exit, otherwise WP_Error. / public function delete_temp_backup( array $temp_backups = array() ) { global $wp_filesystem; $errors = new WP_Error(); if ( empty( $temp_backups ) ) { $temp_backups = $this->temp_backups; } foreach ( $temp_backups as $args ) { if ( empty( $args['slug'] ) \|\| empty( $args['dir'] ) ) { return false; } if ( ! $wp_filesystem->wp_content_dir() ) { $errors->add( 'fs_no_content_dir', $this->strings['fs_no_content_dir'] ); return $errors; } $temp_backup_dir = $wp_filesystem->wp_content_dir() . "upgrade-temp-backup/{$args['dir']}/{$args['slug']}"; if ( ! $wp_filesystem->delete( $temp_backup_dir, true ) ) { $errors->add( 'temp_backup_delete_failed', sprintf( $this->strings['temp_backup_delete_failed'], $args['slug'] ) ); continue; } } return $errors->has_errors() ? $errors : true; } } /* Plugin_Upgrader class / require_once ABSPATH . 'wp-admin/includes/class-plugin-upgrader.php'; /* Theme_Upgrader class / require_once ABSPATH . 'wp-admin/includes/class-theme-upgrader.php'; /* Language_Pack_Upgrader class / require_once ABSPATH . 'wp-admin/includes/class-language-pack-upgrader.php'; /* Core_Upgrader class / require_once ABSPATH . 'wp-admin/includes/class-core-upgrader.php'; /* File_Upload_Upgrader class / require_once ABSPATH . 'wp-admin/includes/class-file-upload-upgrader.php'; /* WP_Automatic_Updater class */ require_once ABSPATH . 'wp-admin/includes/class-wp-automatic-updater.php'; Back

Edit File : class-wp-upgrader.php | Size : 46.88 KB

<?php
/**
 * Upgrade API: WP_Upgrader class
 *
 * Requires skin classes and WP_Upgrader subclasses for backward compatibility.
 *
 * @package WordPress
 * @subpackage Upgrader
 * @since 2.8.0
 */

/** WP_Upgrader_Skin class */
require_once ABSPATH . 'wp-admin/includes/class-wp-upgrader-skin.php';

/** Plugin_Upgrader_Skin class */
require_once ABSPATH . 'wp-admin/includes/class-plugin-upgrader-skin.php';

/** Theme_Upgrader_Skin class */
require_once ABSPATH . 'wp-admin/includes/class-theme-upgrader-skin.php';

/** Bulk_Upgrader_Skin class */
require_once ABSPATH . 'wp-admin/includes/class-bulk-upgrader-skin.php';

/** Bulk_Plugin_Upgrader_Skin class */
require_once ABSPATH . 'wp-admin/includes/class-bulk-plugin-upgrader-skin.php';

/** Bulk_Theme_Upgrader_Skin class */
require_once ABSPATH . 'wp-admin/includes/class-bulk-theme-upgrader-skin.php';

/** Plugin_Installer_Skin class */
require_once ABSPATH . 'wp-admin/includes/class-plugin-installer-skin.php';

/** Theme_Installer_Skin class */
require_once ABSPATH . 'wp-admin/includes/class-theme-installer-skin.php';

/** Language_Pack_Upgrader_Skin class */
require_once ABSPATH . 'wp-admin/includes/class-language-pack-upgrader-skin.php';

/** Automatic_Upgrader_Skin class */
require_once ABSPATH . 'wp-admin/includes/class-automatic-upgrader-skin.php';

/** WP_Ajax_Upgrader_Skin class */
require_once ABSPATH . 'wp-admin/includes/class-wp-ajax-upgrader-skin.php';

/**
 * Core class used for upgrading/installing a local set of files via
 * the Filesystem Abstraction classes from a Zip file.
 *
 * @since 2.8.0
 */
#[AllowDynamicProperties]
class WP_Upgrader {

/**
	 * The error/notification strings used to update the user on the progress.
	 *
	 * @since 2.8.0
	 * @var array $strings
	 */
	public $strings = array();

/**
	 * The upgrader skin being used.
	 *
	 * @since 2.8.0
	 * @var Automatic_Upgrader_Skin|WP_Upgrader_Skin $skin
	 */
	public $skin = null;

/**
	 * The result of the installation.
	 *
	 * This is set by WP_Upgrader::install_package(), only when the package is installed
	 * successfully. It will then be an array, unless a WP_Error is returned by the
	 * {@see 'upgrader_post_install'} filter. In that case, the WP_Error will be assigned to
	 * it.
	 *
	 * @since 2.8.0
	 *
	 * @var array|WP_Error $result {
	 *     @type string $source             The full path to the source the files were installed from.
	 *     @type string $source_files       List of all the files in the source directory.
	 *     @type string $destination        The full path to the installation destination folder.
	 *     @type string $destination_name   The name of the destination folder, or empty if `$destination`
	 *                                      and `$local_destination` are the same.
	 *     @type string $local_destination  The full local path to the destination folder. This is usually
	 *                                      the same as `$destination`.
	 *     @type string $remote_destination The full remote path to the destination folder
	 *                                      (i.e., from `$wp_filesystem`).
	 *     @type bool   $clear_destination  Whether the destination folder was cleared.
	 * }
	 */
	public $result = array();

/**
	 * The total number of updates being performed.
	 *
	 * Set by the bulk update methods.
	 *
	 * @since 3.0.0
	 * @var int $update_count
	 */
	public $update_count = 0;

/**
	 * The current update if multiple updates are being performed.
	 *
	 * Used by the bulk update methods, and incremented for each update.
	 *
	 * @since 3.0.0
	 * @var int
	 */
	public $update_current = 0;

/**
	 * Stores the list of plugins or themes added to temporary backup directory.
	 *
	 * Used by the rollback functions.
	 *
	 * @since 6.3.0
	 * @var array
	 */
	private $temp_backups = array();

/**
	 * Stores the list of plugins or themes to be restored from temporary backup directory.
	 *
	 * Used by the rollback functions.
	 *
	 * @since 6.3.0
	 * @var array
	 */
	private $temp_restores = array();

/**
	 * Construct the upgrader with a skin.
	 *
	 * @since 2.8.0
	 *
	 * @param WP_Upgrader_Skin $skin The upgrader skin to use. Default is a WP_Upgrader_Skin
	 *                               instance.
	 */
	public function __construct( $skin = null ) {
		if ( null === $skin ) {
			$this->skin = new WP_Upgrader_Skin();
		} else {
			$this->skin = $skin;
		}
	}

/**
	 * Initializes the upgrader.
	 *
	 * This will set the relationship between the skin being used and this upgrader,
	 * and also add the generic strings to `WP_Upgrader::$strings`.
	 *
	 * Additionally, it will schedule a weekly task to clean up the temporary backup directory.
	 *
	 * @since 2.8.0
	 * @since 6.3.0 Added the `schedule_temp_backup_cleanup()` task.
	 */
	public function init() {
		$this->skin->set_upgrader( $this );
		$this->generic_strings();

if ( ! wp_installing() ) {
			$this->schedule_temp_backup_cleanup();
		}
	}

/**
	 * Schedules the cleanup of the temporary backup directory.
	 *
	 * @since 6.3.0
	 */
	protected function schedule_temp_backup_cleanup() {
		if ( false === wp_next_scheduled( 'wp_delete_temp_updater_backups' ) ) {
			wp_schedule_event( time(), 'weekly', 'wp_delete_temp_updater_backups' );
		}
	}

/**
	 * Adds the generic strings to WP_Upgrader::$strings.
	 *
	 * @since 2.8.0
	 */
	public function generic_strings() {
		$this->strings['bad_request']    = __( 'Invalid data provided.' );
		$this->strings['fs_unavailable'] = __( 'Could not access filesystem.' );
		$this->strings['fs_error']       = __( 'Filesystem error.' );
		$this->strings['fs_no_root_dir'] = __( 'Unable to locate WordPress root directory.' );
		/* translators: %s: Directory name. */
		$this->strings['fs_no_content_dir'] = sprintf( __( 'Unable to locate WordPress content directory (%s).' ), 'wp-content' );
		$this->strings['fs_no_plugins_dir'] = __( 'Unable to locate WordPress plugin directory.' );
		$this->strings['fs_no_themes_dir']  = __( 'Unable to locate WordPress theme directory.' );
		/* translators: %s: Directory name. */
		$this->strings['fs_no_folder'] = __( 'Unable to locate needed folder (%s).' );

$this->strings['no_package']           = __( 'Package not available.' );
		$this->strings['download_failed']      = __( 'Download failed.' );
		$this->strings['installing_package']   = __( 'Installing the latest version&#8230;' );
		$this->strings['no_files']             = __( 'The package contains no files.' );
		$this->strings['folder_exists']        = __( 'Destination folder already exists.' );
		$this->strings['mkdir_failed']         = __( 'Could not create directory.' );
		$this->strings['incompatible_archive'] = __( 'The package could not be installed.' );
		$this->strings['files_not_writable']   = __( 'The update cannot be installed because some files could not be copied. This is usually due to inconsistent file permissions.' );
		$this->strings['dir_not_readable']     = __( 'A directory could not be read.' );

$this->strings['maintenance_start'] = __( 'Enabling Maintenance mode&#8230;' );
		$this->strings['maintenance_end']   = __( 'Disabling Maintenance mode&#8230;' );

/* translators: %s: upgrade-temp-backup */
		$this->strings['temp_backup_mkdir_failed'] = sprintf( __( 'Could not create the %s directory.' ), 'upgrade-temp-backup' );
		/* translators: %s: upgrade-temp-backup */
		$this->strings['temp_backup_move_failed'] = sprintf( __( 'Could not move the old version to the %s directory.' ), 'upgrade-temp-backup' );
		/* translators: %s: The plugin or theme slug. */
		$this->strings['temp_backup_restore_failed'] = __( 'Could not restore the original version of %s.' );
		/* translators: %s: The plugin or theme slug. */
		$this->strings['temp_backup_delete_failed'] = __( 'Could not delete the temporary backup directory for %s.' );
	}

/**
	 * Connects to the filesystem.
	 *
	 * @since 2.8.0
	 *
	 * @global WP_Filesystem_Base $wp_filesystem WordPress filesystem subclass.
	 *
	 * @param string[] $directories                  Optional. Array of directories. If any of these do
	 *                                               not exist, a WP_Error object will be returned.
	 *                                               Default empty array.
	 * @param bool     $allow_relaxed_file_ownership Whether to allow relaxed file ownership.
	 *                                               Default false.
	 * @return bool|WP_Error True if able to connect, false or a WP_Error otherwise.
	 */
	public function fs_connect( $directories = array(), $allow_relaxed_file_ownership = false ) {
		global $wp_filesystem;

$credentials = $this->skin->request_filesystem_credentials( false, $directories[0], $allow_relaxed_file_ownership );
		if ( false === $credentials ) {
			return false;
		}

if ( ! WP_Filesystem( $credentials, $directories[0], $allow_relaxed_file_ownership ) ) {
			$error = true;
			if ( is_object( $wp_filesystem ) && $wp_filesystem->errors->has_errors() ) {
				$error = $wp_filesystem->errors;
			}
			// Failed to connect. Error and request again.
			$this->skin->request_filesystem_credentials( $error, $directories[0], $allow_relaxed_file_ownership );
			return false;
		}

if ( ! is_object( $wp_filesystem ) ) {
			return new WP_Error( 'fs_unavailable', $this->strings['fs_unavailable'] );
		}

if ( is_wp_error( $wp_filesystem->errors ) && $wp_filesystem->errors->has_errors() ) {
			return new WP_Error( 'fs_error', $this->strings['fs_error'], $wp_filesystem->errors );
		}

foreach ( (array) $directories as $dir ) {
			switch ( $dir ) {
				case ABSPATH:
					if ( ! $wp_filesystem->abspath() ) {
						return new WP_Error( 'fs_no_root_dir', $this->strings['fs_no_root_dir'] );
					}
					break;
				case WP_CONTENT_DIR:
					if ( ! $wp_filesystem->wp_content_dir() ) {
						return new WP_Error( 'fs_no_content_dir', $this->strings['fs_no_content_dir'] );
					}
					break;
				case WP_PLUGIN_DIR:
					if ( ! $wp_filesystem->wp_plugins_dir() ) {
						return new WP_Error( 'fs_no_plugins_dir', $this->strings['fs_no_plugins_dir'] );
					}
					break;
				case get_theme_root():
					if ( ! $wp_filesystem->wp_themes_dir() ) {
						return new WP_Error( 'fs_no_themes_dir', $this->strings['fs_no_themes_dir'] );
					}
					break;
				default:
					if ( ! $wp_filesystem->find_folder( $dir ) ) {
						return new WP_Error( 'fs_no_folder', sprintf( $this->strings['fs_no_folder'], esc_html( basename( $dir ) ) ) );
					}
					break;
			}
		}
		return true;
	}

/**
	 * Downloads a package.
	 *
	 * @since 2.8.0
	 * @since 5.2.0 Added the `$check_signatures` parameter.
	 * @since 5.5.0 Added the `$hook_extra` parameter.
	 *
	 * @param string $package          The URI of the package. If this is the full path to an
	 *                                 existing local file, it will be returned untouched.
	 * @param bool   $check_signatures Whether to validate file signatures. Default false.
	 * @param array  $hook_extra       Extra arguments to pass to the filter hooks. Default empty array.
	 * @return string|WP_Error The full path to the downloaded package file, or a WP_Error object.
	 */
	public function download_package( $package, $check_signatures = false, $hook_extra = array() ) {
		/**
		 * Filters whether to return the package.
		 *
		 * @since 3.7.0
		 * @since 5.5.0 Added the `$hook_extra` parameter.
		 *
		 * @param bool        $reply      Whether to bail without returning the package.
		 *                                Default false.
		 * @param string      $package    The package file name.
		 * @param WP_Upgrader $upgrader   The WP_Upgrader instance.
		 * @param array       $hook_extra Extra arguments passed to hooked filters.
		 */
		$reply = apply_filters( 'upgrader_pre_download', false, $package, $this, $hook_extra );
		if ( false !== $reply ) {
			return $reply;
		}

if ( ! preg_match( '!^(http|https|ftp)://!i', $package ) && file_exists( $package ) ) { // Local file or remote?
			return $package; // Must be a local file.
		}

if ( empty( $package ) ) {
			return new WP_Error( 'no_package', $this->strings['no_package'] );
		}

$this->skin->feedback( 'downloading_package', $package );

$download_file = download_url( $package, 300, $check_signatures );

if ( is_wp_error( $download_file ) && ! $download_file->get_error_data( 'softfail-filename' ) ) {
			return new WP_Error( 'download_failed', $this->strings['download_failed'], $download_file->get_error_message() );
		}

return $download_file;
	}

/**
	 * Unpacks a compressed package file.
	 *
	 * @since 2.8.0
	 *
	 * @global WP_Filesystem_Base $wp_filesystem WordPress filesystem subclass.
	 *
	 * @param string $package        Full path to the package file.
	 * @param bool   $delete_package Optional. Whether to delete the package file after attempting
	 *                               to unpack it. Default true.
	 * @return string|WP_Error The path to the unpacked contents, or a WP_Error on failure.
	 */
	public function unpack_package( $package, $delete_package = true ) {
		global $wp_filesystem;

$this->skin->feedback( 'unpack_package' );

if ( ! $wp_filesystem->wp_content_dir() ) {
			return new WP_Error( 'fs_no_content_dir', $this->strings['fs_no_content_dir'] );
		}

$upgrade_folder = $wp_filesystem->wp_content_dir() . 'upgrade/';

// Clean up contents of upgrade directory beforehand.
		$upgrade_files = $wp_filesystem->dirlist( $upgrade_folder );
		if ( ! empty( $upgrade_files ) ) {
			foreach ( $upgrade_files as $file ) {
				$wp_filesystem->delete( $upgrade_folder . $file['name'], true );
			}
		}

// We need a working directory - strip off any .tmp or .zip suffixes.
		$working_dir = $upgrade_folder . basename( basename( $package, '.tmp' ), '.zip' );

// Clean up working directory.
		if ( $wp_filesystem->is_dir( $working_dir ) ) {
			$wp_filesystem->delete( $working_dir, true );
		}

// Unzip package to working directory.
		$result = unzip_file( $package, $working_dir );

// Once extracted, delete the package if required.
		if ( $delete_package ) {
			unlink( $package );
		}

if ( is_wp_error( $result ) ) {
			$wp_filesystem->delete( $working_dir, true );
			if ( 'incompatible_archive' === $result->get_error_code() ) {
				return new WP_Error( 'incompatible_archive', $this->strings['incompatible_archive'], $result->get_error_data() );
			}
			return $result;
		}

return $working_dir;
	}

/**
	 * Flattens the results of WP_Filesystem_Base::dirlist() for iterating over.
	 *
	 * @since 4.9.0
	 * @access protected
	 *
	 * @param array  $nested_files Array of files as returned by WP_Filesystem_Base::dirlist().
	 * @param string $path         Relative path to prepend to child nodes. Optional.
	 * @return array A flattened array of the $nested_files specified.
	 */
	protected function flatten_dirlist( $nested_files, $path = '' ) {
		$files = array();

foreach ( $nested_files as $name => $details ) {
			$files[ $path . $name ] = $details;

// Append children recursively.
			if ( ! empty( $details['files'] ) ) {
				$children = $this->flatten_dirlist( $details['files'], $path . $name . '/' );

// Merge keeping possible numeric keys, which array_merge() will reindex from 0..n.
				$files = $files + $children;
			}
		}

return $files;
	}

/**
	 * Clears the directory where this item is going to be installed into.
	 *
	 * @since 4.3.0
	 *
	 * @global WP_Filesystem_Base $wp_filesystem WordPress filesystem subclass.
	 *
	 * @param string $remote_destination The location on the remote filesystem to be cleared.
	 * @return true|WP_Error True upon success, WP_Error on failure.
	 */
	public function clear_destination( $remote_destination ) {
		global $wp_filesystem;

$files = $wp_filesystem->dirlist( $remote_destination, true, true );

// False indicates that the $remote_destination doesn't exist.
		if ( false === $files ) {
			return true;
		}

// Flatten the file list to iterate over.
		$files = $this->flatten_dirlist( $files );

// Check all files are writable before attempting to clear the destination.
		$unwritable_files = array();

// Check writability.
		foreach ( $files as $filename => $file_details ) {
			if ( ! $wp_filesystem->is_writable( $remote_destination . $filename ) ) {
				// Attempt to alter permissions to allow writes and try again.
				$wp_filesystem->chmod( $remote_destination . $filename, ( 'd' === $file_details['type'] ? FS_CHMOD_DIR : FS_CHMOD_FILE ) );
				if ( ! $wp_filesystem->is_writable( $remote_destination . $filename ) ) {
					$unwritable_files[] = $filename;
				}
			}
		}

if ( ! empty( $unwritable_files ) ) {
			return new WP_Error( 'files_not_writable', $this->strings['files_not_writable'], implode( ', ', $unwritable_files ) );
		}

if ( ! $wp_filesystem->delete( $remote_destination, true ) ) {
			return new WP_Error( 'remove_old_failed', $this->strings['remove_old_failed'] );
		}

return true;
	}

/**
	 * Install a package.
	 *
	 * Copies the contents of a package from a source directory, and installs them in
	 * a destination directory. Optionally removes the source. It can also optionally
	 * clear out the destination folder if it already exists.
	 *
	 * @since 2.8.0
	 * @since 6.2.0 Use move_dir() instead of copy_dir() when possible.
	 *
	 * @global WP_Filesystem_Base $wp_filesystem        WordPress filesystem subclass.
	 * @global string[]           $wp_theme_directories
	 *
	 * @param array|string $args {
	 *     Optional. Array or string of arguments for installing a package. Default empty array.
	 *
	 *     @type string $source                      Required path to the package source. Default empty.
	 *     @type string $destination                 Required path to a folder to install the package in.
	 *                                               Default empty.
	 *     @type bool   $clear_destination           Whether to delete any files already in the destination
	 *                                               folder. Default false.
	 *     @type bool   $clear_working               Whether to delete the files from the working directory
	 *                                               after copying them to the destination. Default false.
	 *     @type bool   $abort_if_destination_exists Whether to abort the installation if
	 *                                               the destination folder already exists. Default true.
	 *     @type array  $hook_extra                  Extra arguments to pass to the filter hooks called by
	 *                                               WP_Upgrader::install_package(). Default empty array.
	 * }
	 *
	 * @return array|WP_Error The result (also stored in `WP_Upgrader::$result`), or a WP_Error on failure.
	 */
	public function install_package( $args = array() ) {
		global $wp_filesystem, $wp_theme_directories;

$defaults = array(
			'source'                      => '', // Please always pass this.
			'destination'                 => '', // ...and this.
			'clear_destination'           => false,
			'clear_working'               => false,
			'abort_if_destination_exists' => true,
			'hook_extra'                  => array(),
		);

$args = wp_parse_args( $args, $defaults );

// These were previously extract()'d.
		$source            = $args['source'];
		$destination       = $args['destination'];
		$clear_destination = $args['clear_destination'];

/*
		 * Give the upgrade an additional 300 seconds (5 minutes) to ensure the install
		 * doesn't prematurely timeout having used up the maximum script execution time
		 * upacking and downloading in WP_Upgrader->run().
		 */
		if ( function_exists( 'set_time_limit' ) ) {
			set_time_limit( 300 );
		}

if (
			( ! is_string( $source ) || '' === $source || trim( $source ) !== $source ) ||
			( ! is_string( $destination ) || '' === $destination || trim( $destination ) !== $destination )
		) {
			return new WP_Error( 'bad_request', $this->strings['bad_request'] );
		}
		$this->skin->feedback( 'installing_package' );

/**
		 * Filters the installation response before the installation has started.
		 *
		 * Returning a value that could be evaluated as a `WP_Error` will effectively
		 * short-circuit the installation, returning that value instead.
		 *
		 * @since 2.8.0
		 *
		 * @param bool|WP_Error $response   Installation response.
		 * @param array         $hook_extra Extra arguments passed to hooked filters.
		 */
		$res = apply_filters( 'upgrader_pre_install', true, $args['hook_extra'] );

if ( is_wp_error( $res ) ) {
			return $res;
		}

// Retain the original source and destinations.
		$remote_source     = $args['source'];
		$local_destination = $destination;

$dirlist = $wp_filesystem->dirlist( $remote_source );

if ( false === $dirlist ) {
			return new WP_Error( 'source_read_failed', $this->strings['fs_error'], $this->strings['dir_not_readable'] );
		}

$source_files       = array_keys( $dirlist );
		$remote_destination = $wp_filesystem->find_folder( $local_destination );

// Locate which directory to copy to the new folder. This is based on the actual folder holding the files.
		if ( 1 === count( $source_files ) && $wp_filesystem->is_dir( trailingslashit( $args['source'] ) . $source_files[0] . '/' ) ) {
			// Only one folder? Then we want its contents.
			$source = trailingslashit( $args['source'] ) . trailingslashit( $source_files[0] );
		} elseif ( 0 === count( $source_files ) ) {
			// There are no files?
			return new WP_Error( 'incompatible_archive_empty', $this->strings['incompatible_archive'], $this->strings['no_files'] );
		} else {
			/*
			 * It's only a single file, the upgrader will use the folder name of this file as the destination folder.
			 * Folder name is based on zip filename.
			 */
			$source = trailingslashit( $args['source'] );
		}

/**
		 * Filters the source file location for the upgrade package.
		 *
		 * @since 2.8.0
		 * @since 4.4.0 The $hook_extra parameter became available.
		 *
		 * @param string      $source        File source location.
		 * @param string      $remote_source Remote file source location.
		 * @param WP_Upgrader $upgrader      WP_Upgrader instance.
		 * @param array       $hook_extra    Extra arguments passed to hooked filters.
		 */
		$source = apply_filters( 'upgrader_source_selection', $source, $remote_source, $this, $args['hook_extra'] );

if ( is_wp_error( $source ) ) {
			return $source;
		}

if ( ! empty( $args['hook_extra']['temp_backup'] ) ) {
			$temp_backup = $this->move_to_temp_backup_dir( $args['hook_extra']['temp_backup'] );

if ( is_wp_error( $temp_backup ) ) {
				return $temp_backup;
			}

$this->temp_backups[] = $args['hook_extra']['temp_backup'];
		}

// Has the source location changed? If so, we need a new source_files list.
		if ( $source !== $remote_source ) {
			$dirlist = $wp_filesystem->dirlist( $source );

if ( false === $dirlist ) {
				return new WP_Error( 'new_source_read_failed', $this->strings['fs_error'], $this->strings['dir_not_readable'] );
			}

$source_files = array_keys( $dirlist );
		}

/*
		 * Protection against deleting files in any important base directories.
		 * Theme_Upgrader & Plugin_Upgrader also trigger this, as they pass the
		 * destination directory (WP_PLUGIN_DIR / wp-content/themes) intending
		 * to copy the directory into the directory, whilst they pass the source
		 * as the actual files to copy.
		 */
		$protected_directories = array( ABSPATH, WP_CONTENT_DIR, WP_PLUGIN_DIR, WP_CONTENT_DIR . '/themes' );

if ( is_array( $wp_theme_directories ) ) {
			$protected_directories = array_merge( $protected_directories, $wp_theme_directories );
		}

if ( in_array( $destination, $protected_directories, true ) ) {
			$remote_destination = trailingslashit( $remote_destination ) . trailingslashit( basename( $source ) );
			$destination        = trailingslashit( $destination ) . trailingslashit( basename( $source ) );
		}

if ( $clear_destination ) {
			// We're going to clear the destination if there's something there.
			$this->skin->feedback( 'remove_old' );

$removed = $this->clear_destination( $remote_destination );

/**
			 * Filters whether the upgrader cleared the destination.
			 *
			 * @since 2.8.0
			 *
			 * @param true|WP_Error $removed            Whether the destination was cleared.
			 *                                          True upon success, WP_Error on failure.
			 * @param string        $local_destination  The local package destination.
			 * @param string        $remote_destination The remote package destination.
			 * @param array         $hook_extra         Extra arguments passed to hooked filters.
			 */
			$removed = apply_filters( 'upgrader_clear_destination', $removed, $local_destination, $remote_destination, $args['hook_extra'] );

if ( is_wp_error( $removed ) ) {
				return $removed;
			}
		} elseif ( $args['abort_if_destination_exists'] && $wp_filesystem->exists( $remote_destination ) ) {
			/*
			 * If we're not clearing the destination folder and something exists there already, bail.
			 * But first check to see if there are actually any files in the folder.
			 */
			$_files = $wp_filesystem->dirlist( $remote_destination );
			if ( ! empty( $_files ) ) {
				$wp_filesystem->delete( $remote_source, true ); // Clear out the source files.
				return new WP_Error( 'folder_exists', $this->strings['folder_exists'], $remote_destination );
			}
		}

/*
		 * If 'clear_working' is false, the source should not be removed, so use copy_dir() instead.
		 *
		 * Partial updates, like language packs, may want to retain the destination.
		 * If the destination exists or has contents, this may be a partial update,
		 * and the destination should not be removed, so use copy_dir() instead.
		 */
		if ( $args['clear_working']
			&& (
				// Destination does not exist or has no contents.
				! $wp_filesystem->exists( $remote_destination )
				|| empty( $wp_filesystem->dirlist( $remote_destination ) )
			)
		) {
			$result = move_dir( $source, $remote_destination, true );
		} else {
			// Create destination if needed.
			if ( ! $wp_filesystem->exists( $remote_destination ) ) {
				if ( ! $wp_filesystem->mkdir( $remote_destination, FS_CHMOD_DIR ) ) {
					return new WP_Error( 'mkdir_failed_destination', $this->strings['mkdir_failed'], $remote_destination );
				}
			}
			$result = copy_dir( $source, $remote_destination );
		}

// Clear the working directory?
		if ( $args['clear_working'] ) {
			$wp_filesystem->delete( $remote_source, true );
		}

if ( is_wp_error( $result ) ) {
			return $result;
		}

$destination_name = basename( str_replace( $local_destination, '', $destination ) );
		if ( '.' === $destination_name ) {
			$destination_name = '';
		}

$this->result = compact( 'source', 'source_files', 'destination', 'destination_name', 'local_destination', 'remote_destination', 'clear_destination' );

/**
		 * Filters the installation response after the installation has finished.
		 *
		 * @since 2.8.0
		 *
		 * @param bool  $response   Installation response.
		 * @param array $hook_extra Extra arguments passed to hooked filters.
		 * @param array $result     Installation result data.
		 */
		$res = apply_filters( 'upgrader_post_install', true, $args['hook_extra'], $this->result );

if ( is_wp_error( $res ) ) {
			$this->result = $res;
			return $res;
		}

// Bombard the calling function will all the info which we've just used.
		return $this->result;
	}

/**
	 * Runs an upgrade/installation.
	 *
	 * Attempts to download the package (if it is not a local file), unpack it, and
	 * install it in the destination folder.
	 *
	 * @since 2.8.0
	 *
	 * @param array $options {
	 *     Array or string of arguments for upgrading/installing a package.
	 *
	 *     @type string $package                     The full path or URI of the package to install.
	 *                                               Default empty.
	 *     @type string $destination                 The full path to the destination folder.
	 *                                               Default empty.
	 *     @type bool   $clear_destination           Whether to delete any files already in the
	 *                                               destination folder. Default false.
	 *     @type bool   $clear_working               Whether to delete the files from the working
	 *                                               directory after copying them to the destination.
	 *                                               Default true.
	 *     @type bool   $abort_if_destination_exists Whether to abort the installation if the destination
	 *                                               folder already exists. When true, `$clear_destination`
	 *                                               should be false. Default true.
	 *     @type bool   $is_multi                    Whether this run is one of multiple upgrade/installation
	 *                                               actions being performed in bulk. When true, the skin
	 *                                               WP_Upgrader::header() and WP_Upgrader::footer()
	 *                                               aren't called. Default false.
	 *     @type array  $hook_extra                  Extra arguments to pass to the filter hooks called by
	 *                                               WP_Upgrader::run().
	 * }
	 * @return array|false|WP_Error The result from self::install_package() on success, otherwise a WP_Error,
	 *                              or false if unable to connect to the filesystem.
	 */
	public function run( $options ) {

$defaults = array(
			'package'                     => '', // Please always pass this.
			'destination'                 => '', // ...and this.
			'clear_destination'           => false,
			'clear_working'               => true,
			'abort_if_destination_exists' => true, // Abort if the destination directory exists. Pass clear_destination as false please.
			'is_multi'                    => false,
			'hook_extra'                  => array(), // Pass any extra $hook_extra args here, this will be passed to any hooked filters.
		);

$options = wp_parse_args( $options, $defaults );

/**
		 * Filters the package options before running an update.
		 *
		 * See also {@see 'upgrader_process_complete'}.
		 *
		 * @since 4.3.0
		 *
		 * @param array $options {
		 *     Options used by the upgrader.
		 *
		 *     @type string $package                     Package for update.
		 *     @type string $destination                 Update location.
		 *     @type bool   $clear_destination           Clear the destination resource.
		 *     @type bool   $clear_working               Clear the working resource.
		 *     @type bool   $abort_if_destination_exists Abort if the Destination directory exists.
		 *     @type bool   $is_multi                    Whether the upgrader is running multiple times.
		 *     @type array  $hook_extra {
		 *         Extra hook arguments.
		 *
		 *         @type string $action               Type of action. Default 'update'.
		 *         @type string $type                 Type of update process. Accepts 'plugin', 'theme', or 'core'.
		 *         @type bool   $bulk                 Whether the update process is a bulk update. Default true.
		 *         @type string $plugin               Path to the plugin file relative to the plugins directory.
		 *         @type string $theme                The stylesheet or template name of the theme.
		 *         @type string $language_update_type The language pack update type. Accepts 'plugin', 'theme',
		 *                                            or 'core'.
		 *         @type object $language_update      The language pack update offer.
		 *     }
		 * }
		 */
		$options = apply_filters( 'upgrader_package_options', $options );

if ( ! $options['is_multi'] ) { // Call $this->header separately if running multiple times.
			$this->skin->header();
		}

// Connect to the filesystem first.
		$res = $this->fs_connect( array( WP_CONTENT_DIR, $options['destination'] ) );
		// Mainly for non-connected filesystem.
		if ( ! $res ) {
			if ( ! $options['is_multi'] ) {
				$this->skin->footer();
			}
			return false;
		}

$this->skin->before();

if ( is_wp_error( $res ) ) {
			$this->skin->error( $res );
			$this->skin->after();
			if ( ! $options['is_multi'] ) {
				$this->skin->footer();
			}
			return $res;
		}

/*
		 * Download the package. Note: If the package is the full path
		 * to an existing local file, it will be returned untouched.
		 */
		$download = $this->download_package( $options['package'], false, $options['hook_extra'] );

/*
		 * Allow for signature soft-fail.
		 * WARNING: This may be removed in the future.
		 */
		if ( is_wp_error( $download ) && $download->get_error_data( 'softfail-filename' ) ) {

// Don't output the 'no signature could be found' failure message for now.
			if ( 'signature_verification_no_signature' !== $download->get_error_code() || WP_DEBUG ) {
				// Output the failure error as a normal feedback, and not as an error.
				$this->skin->feedback( $download->get_error_message() );

// Report this failure back to WordPress.org for debugging purposes.
				wp_version_check(
					array(
						'signature_failure_code' => $download->get_error_code(),
						'signature_failure_data' => $download->get_error_data(),
					)
				);
			}

// Pretend this error didn't happen.
			$download = $download->get_error_data( 'softfail-filename' );
		}

if ( is_wp_error( $download ) ) {
			$this->skin->error( $download );
			$this->skin->after();
			if ( ! $options['is_multi'] ) {
				$this->skin->footer();
			}
			return $download;
		}

$delete_package = ( $download !== $options['package'] ); // Do not delete a "local" file.

// Unzips the file into a temporary directory.
		$working_dir = $this->unpack_package( $download, $delete_package );
		if ( is_wp_error( $working_dir ) ) {
			$this->skin->error( $working_dir );
			$this->skin->after();
			if ( ! $options['is_multi'] ) {
				$this->skin->footer();
			}
			return $working_dir;
		}

// With the given options, this installs it to the destination directory.
		$result = $this->install_package(
			array(
				'source'                      => $working_dir,
				'destination'                 => $options['destination'],
				'clear_destination'           => $options['clear_destination'],
				'abort_if_destination_exists' => $options['abort_if_destination_exists'],
				'clear_working'               => $options['clear_working'],
				'hook_extra'                  => $options['hook_extra'],
			)
		);

/**
		 * Filters the result of WP_Upgrader::install_package().
		 *
		 * @since 5.7.0
		 *
		 * @param array|WP_Error $result     Result from WP_Upgrader::install_package().
		 * @param array          $hook_extra Extra arguments passed to hooked filters.
		 */
		$result = apply_filters( 'upgrader_install_package_result', $result, $options['hook_extra'] );

$this->skin->set_result( $result );

if ( is_wp_error( $result ) ) {
			// An automatic plugin update will have already performed its rollback.
			if ( ! empty( $options['hook_extra']['temp_backup'] ) ) {
				$this->temp_restores[] = $options['hook_extra']['temp_backup'];

/*
				 * Restore the backup on shutdown.
				 * Actions running on `shutdown` are immune to PHP timeouts,
				 * so in case the failure was due to a PHP timeout,
				 * it will still be able to properly restore the previous version.
				 *
				 * Zero arguments are accepted as a string can sometimes be passed
				 * internally during actions, causing an error because
				 * `WP_Upgrader::restore_temp_backup()` expects an array.
				 */
				add_action( 'shutdown', array( $this, 'restore_temp_backup' ), 10, 0 );
			}
			$this->skin->error( $result );

if ( ! method_exists( $this->skin, 'hide_process_failed' ) || ! $this->skin->hide_process_failed( $result ) ) {
				$this->skin->feedback( 'process_failed' );
			}
		} else {
			// Installation succeeded.
			$this->skin->feedback( 'process_success' );
		}

$this->skin->after();

// Clean up the backup kept in the temporary backup directory.
		if ( ! empty( $options['hook_extra']['temp_backup'] ) ) {
			// Delete the backup on `shutdown` to avoid a PHP timeout.
			add_action( 'shutdown', array( $this, 'delete_temp_backup' ), 100, 0 );
		}

if ( ! $options['is_multi'] ) {

/**
			 * Fires when the upgrader process is complete.
			 *
			 * See also {@see 'upgrader_package_options'}.
			 *
			 * @since 3.6.0
			 * @since 3.7.0 Added to WP_Upgrader::run().
			 * @since 4.6.0 `$translations` was added as a possible argument to `$hook_extra`.
			 *
			 * @param WP_Upgrader $upgrader   WP_Upgrader instance. In other contexts this might be a
			 *                                Theme_Upgrader, Plugin_Upgrader, Core_Upgrade, or Language_Pack_Upgrader instance.
			 * @param array       $hook_extra {
			 *     Array of bulk item update data.
			 *
			 *     @type string $action       Type of action. Default 'update'.
			 *     @type string $type         Type of update process. Accepts 'plugin', 'theme', 'translation', or 'core'.
			 *     @type bool   $bulk         Whether the update process is a bulk update. Default true.
			 *     @type array  $plugins      Array of the basename paths of the plugins' main files.
			 *     @type array  $themes       The theme slugs.
			 *     @type array  $translations {
			 *         Array of translations update data.
			 *
			 *         @type string $language The locale the translation is for.
			 *         @type string $type     Type of translation. Accepts 'plugin', 'theme', or 'core'.
			 *         @type string $slug     Text domain the translation is for. The slug of a theme/plugin or
			 *                                'default' for core translations.
			 *         @type string $version  The version of a theme, plugin, or core.
			 *     }
			 * }
			 */
			do_action( 'upgrader_process_complete', $this, $options['hook_extra'] );

$this->skin->footer();
		}

return $result;
	}

/**
	 * Toggles maintenance mode for the site.
	 *
	 * Creates/deletes the maintenance file to enable/disable maintenance mode.
	 *
	 * @since 2.8.0
	 *
	 * @global WP_Filesystem_Base $wp_filesystem WordPress filesystem subclass.
	 *
	 * @param bool $enable True to enable maintenance mode, false to disable.
	 */
	public function maintenance_mode( $enable = false ) {
		global $wp_filesystem;

if ( ! $wp_filesystem ) {
			if ( ! function_exists( 'WP_Filesystem' ) ) {
				require_once ABSPATH . 'wp-admin/includes/file.php';
			}

ob_start();
			$credentials = request_filesystem_credentials( '' );
			ob_end_clean();

if ( false === $credentials || ! WP_Filesystem( $credentials ) ) {
				wp_trigger_error( __FUNCTION__, __( 'Could not access filesystem.' ) );
				return;
			}
		}

$file = $wp_filesystem->abspath() . '.maintenance';
		if ( $enable ) {
			if ( ! wp_doing_cron() ) {
				$this->skin->feedback( 'maintenance_start' );
			}
			// Create maintenance file to signal that we are upgrading.
			$maintenance_string = '<?php $upgrading = ' . time() . '; ?>';
			$wp_filesystem->delete( $file );
			$wp_filesystem->put_contents( $file, $maintenance_string, FS_CHMOD_FILE );
		} elseif ( ! $enable && $wp_filesystem->exists( $file ) ) {
			if ( ! wp_doing_cron() ) {
				$this->skin->feedback( 'maintenance_end' );
			}
			$wp_filesystem->delete( $file );
		}
	}

/**
	 * Creates a lock using WordPress options.
	 *
	 * @since 4.5.0
	 *
	 * @global wpdb $wpdb The WordPress database abstraction object.
	 *
	 * @param string $lock_name       The name of this unique lock.
	 * @param int    $release_timeout Optional. The duration in seconds to respect an existing lock.
	 *                                Default: 1 hour.
	 * @return bool False if a lock couldn't be created or if the lock is still valid. True otherwise.
	 */
	public static function create_lock( $lock_name, $release_timeout = null ) {
		global $wpdb;
		if ( ! $release_timeout ) {
			$release_timeout = HOUR_IN_SECONDS;
		}
		$lock_option = $lock_name . '.lock';

// Try to lock.
		$lock_result = $wpdb->query( $wpdb->prepare( "INSERT IGNORE INTO `$wpdb->options` ( `option_name`, `option_value`, `autoload` ) VALUES (%s, %s, 'off') /* LOCK */", $lock_option, time() ) );

if ( ! $lock_result ) {
			$lock_result = get_option( $lock_option );

// If a lock couldn't be created, and there isn't a lock, bail.
			if ( ! $lock_result ) {
				return false;
			}

// Check to see if the lock is still valid. If it is, bail.
			if ( $lock_result > ( time() - $release_timeout ) ) {
				return false;
			}

// There must exist an expired lock, clear it and re-gain it.
			WP_Upgrader::release_lock( $lock_name );

return WP_Upgrader::create_lock( $lock_name, $release_timeout );
		}

// Update the lock, as by this point we've definitely got a lock, just need to fire the actions.
		update_option( $lock_option, time(), false );

return true;
	}

/**
	 * Releases an upgrader lock.
	 *
	 * @since 4.5.0
	 *
	 * @see WP_Upgrader::create_lock()
	 *
	 * @param string $lock_name The name of this unique lock.
	 * @return bool True if the lock was successfully released. False on failure.
	 */
	public static function release_lock( $lock_name ) {
		return delete_option( $lock_name . '.lock' );
	}

/**
	 * Moves the plugin or theme being updated into a temporary backup directory.
	 *
	 * @since 6.3.0
	 *
	 * @global WP_Filesystem_Base $wp_filesystem WordPress filesystem subclass.
	 *
	 * @param string[] $args {
	 *     Array of data for the temporary backup.
	 *
	 *     @type string $slug Plugin or theme slug.
	 *     @type string $src  Path to the root directory for plugins or themes.
	 *     @type string $dir  Destination subdirectory name. Accepts 'plugins' or 'themes'.
	 * }
	 *
	 * @return bool|WP_Error True on success, false on early exit, otherwise WP_Error.
	 */
	public function move_to_temp_backup_dir( $args ) {
		global $wp_filesystem;

if ( empty( $args['slug'] ) || empty( $args['src'] ) || empty( $args['dir'] ) ) {
			return false;
		}

/*
		 * Skip any plugin that has "." as its slug.
		 * A slug of "." will result in a `$src` value ending in a period.
		 *
		 * On Windows, this will cause the 'plugins' folder to be moved,
		 * and will cause a failure when attempting to call `mkdir()`.
		 */
		if ( '.' === $args['slug'] ) {
			return false;
		}

if ( ! $wp_filesystem->wp_content_dir() ) {
			return new WP_Error( 'fs_no_content_dir', $this->strings['fs_no_content_dir'] );
		}

$dest_dir = $wp_filesystem->wp_content_dir() . 'upgrade-temp-backup/';
		$sub_dir  = $dest_dir . $args['dir'] . '/';

// Create the temporary backup directory if it does not exist.
		if ( ! $wp_filesystem->is_dir( $sub_dir ) ) {
			if ( ! $wp_filesystem->is_dir( $dest_dir ) ) {
				$wp_filesystem->mkdir( $dest_dir, FS_CHMOD_DIR );
			}

if ( ! $wp_filesystem->mkdir( $sub_dir, FS_CHMOD_DIR ) ) {
				// Could not create the backup directory.
				return new WP_Error( 'fs_temp_backup_mkdir', $this->strings['temp_backup_mkdir_failed'] );
			}
		}

$src_dir = $wp_filesystem->find_folder( $args['src'] );
		$src     = trailingslashit( $src_dir ) . $args['slug'];
		$dest    = $dest_dir . trailingslashit( $args['dir'] ) . $args['slug'];

// Delete the temporary backup directory if it already exists.
		if ( $wp_filesystem->is_dir( $dest ) ) {
			$wp_filesystem->delete( $dest, true );
		}

// Move to the temporary backup directory.
		$result = move_dir( $src, $dest, true );
		if ( is_wp_error( $result ) ) {
			return new WP_Error( 'fs_temp_backup_move', $this->strings['temp_backup_move_failed'] );
		}

return true;
	}

/**
	 * Restores the plugin or theme from temporary backup.
	 *
	 * @since 6.3.0
	 * @since 6.6.0 Added the `$temp_backups` parameter.
	 *
	 * @global WP_Filesystem_Base $wp_filesystem WordPress filesystem subclass.
	 *
	 * @param array[] $temp_backups {
	 *     Optional. An array of temporary backups.
	 *
	 *     @type array ...$0 {
	 *         Information about the backup.
	 *
	 *         @type string $dir  The temporary backup location in the upgrade-temp-backup directory.
	 *         @type string $slug The item's slug.
	 *         @type string $src  The directory where the original is stored. For example, `WP_PLUGIN_DIR`.
	 *     }
	 * }
	 * @return bool|WP_Error True on success, false on early exit, otherwise WP_Error.
	 */
	public function restore_temp_backup( array $temp_backups = array() ) {
		global $wp_filesystem;

$errors = new WP_Error();

if ( empty( $temp_backups ) ) {
			$temp_backups = $this->temp_restores;
		}

foreach ( $temp_backups as $args ) {
			if ( empty( $args['slug'] ) || empty( $args['src'] ) || empty( $args['dir'] ) ) {
				return false;
			}

if ( ! $wp_filesystem->wp_content_dir() ) {
				$errors->add( 'fs_no_content_dir', $this->strings['fs_no_content_dir'] );
				return $errors;
			}

$src      = $wp_filesystem->wp_content_dir() . 'upgrade-temp-backup/' . $args['dir'] . '/' . $args['slug'];
			$dest_dir = $wp_filesystem->find_folder( $args['src'] );
			$dest     = trailingslashit( $dest_dir ) . $args['slug'];

if ( $wp_filesystem->is_dir( $src ) ) {
				// Cleanup.
				if ( $wp_filesystem->is_dir( $dest ) && ! $wp_filesystem->delete( $dest, true ) ) {
					$errors->add(
						'fs_temp_backup_delete',
						sprintf( $this->strings['temp_backup_restore_failed'], $args['slug'] )
					);
					continue;
				}

// Move it.
				$result = move_dir( $src, $dest, true );
				if ( is_wp_error( $result ) ) {
					$errors->add(
						'fs_temp_backup_delete',
						sprintf( $this->strings['temp_backup_restore_failed'], $args['slug'] )
					);
					continue;
				}
			}
		}

return $errors->has_errors() ? $errors : true;
	}

/**
	 * Deletes a temporary backup.
	 *
	 * @since 6.3.0
	 * @since 6.6.0 Added the `$temp_backups` parameter.
	 *
	 * @global WP_Filesystem_Base $wp_filesystem WordPress filesystem subclass.
	 *
	 * @param array[] $temp_backups {
	 *     Optional. An array of temporary backups.
	 *
	 *     @type array ...$0 {
	 *         Information about the backup.
	 *
	 *         @type string $dir  The temporary backup location in the upgrade-temp-backup directory.
	 *         @type string $slug The item's slug.
	 *         @type string $src  The directory where the original is stored. For example, `WP_PLUGIN_DIR`.
	 *     }
	 * }
	 * @return bool|WP_Error True on success, false on early exit, otherwise WP_Error.
	 */
	public function delete_temp_backup( array $temp_backups = array() ) {
		global $wp_filesystem;

$errors = new WP_Error();

if ( empty( $temp_backups ) ) {
			$temp_backups = $this->temp_backups;
		}

foreach ( $temp_backups as $args ) {
			if ( empty( $args['slug'] ) || empty( $args['dir'] ) ) {
				return false;
			}

if ( ! $wp_filesystem->wp_content_dir() ) {
				$errors->add( 'fs_no_content_dir', $this->strings['fs_no_content_dir'] );
				return $errors;
			}

$temp_backup_dir = $wp_filesystem->wp_content_dir() . "upgrade-temp-backup/{$args['dir']}/{$args['slug']}";

if ( ! $wp_filesystem->delete( $temp_backup_dir, true ) ) {
				$errors->add(
					'temp_backup_delete_failed',
					sprintf( $this->strings['temp_backup_delete_failed'], $args['slug'] )
				);
				continue;
			}
		}

return $errors->has_errors() ? $errors : true;
	}
}

/** Plugin_Upgrader class */
require_once ABSPATH . 'wp-admin/includes/class-plugin-upgrader.php';

/** Theme_Upgrader class */
require_once ABSPATH . 'wp-admin/includes/class-theme-upgrader.php';

/** Language_Pack_Upgrader class */
require_once ABSPATH . 'wp-admin/includes/class-language-pack-upgrader.php';

/** Core_Upgrader class */
require_once ABSPATH . 'wp-admin/includes/class-core-upgrader.php';

/** File_Upload_Upgrader class */
require_once ABSPATH . 'wp-admin/includes/class-file-upload-upgrader.php';

/** WP_Automatic_Updater class */
require_once ABSPATH . 'wp-admin/includes/class-wp-automatic-updater.php';

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