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class-wp-upgrader.php

<?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
 */
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;

/**
	 * 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;
		}
	}

/**
	 * Initialize 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`.
	 *
	 * @since 2.8.0
	 */
	public function init() {
		$this->skin->set_upgrader( $this );
		$this->generic_strings();
	}

/**
	 * Add 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.' );
		$this->strings['fs_no_content_dir'] = __( 'Unable to locate WordPress content directory (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['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 we will be unable to copy some files. This is usually due to inconsistent file permissions.' );

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

/**
	 * Connect 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;
	}

/**
	 * Download a package.
	 *
	 * @since 2.8.0
	 * @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;
	}

/**
	 * Unpack 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' );

$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;
	}

/**
	 * Flatten 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 bool|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 form 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
	 *
	 * @global WP_Filesystem_Base $wp_filesystem        WordPress filesystem subclass.
	 * @global array              $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 form the working directory
	 *                                               after copying 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'];

set_time_limit( 300 );

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

/**
		 * Filters the install response before the installation has started.
		 *
		 * Returning a truthy value, or one 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   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;

$source_files       = array_keys( $wp_filesystem->dirlist( $remote_source ) );
		$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;
		}

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

/*
		 * 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 );
			}
		}

// 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 );
			}
		}

// Copy new version of item into place.
		$result = copy_dir( $source, $remote_destination );
		if ( is_wp_error( $result ) ) {
			if ( $args['clear_working'] ) {
				$wp_filesystem->delete( $remote_source, true );
			}
			return $result;
		}

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

$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;
	}

/**
	 * Run 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 form the working
	 *                                               directory after copying to the destination.
	 *                                               Default false.
	 *     @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,
			'abort_if_destination_exists' => true, // Abort if the destination directory exists. Pass clear_destination as false please.
			'clear_working'               => true,
			'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, This just returns the filename
		 * of the file if the package is a local file)
		 */
		$download = $this->download_package( $options['package'], true, $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 ) ) {
			$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();

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 $this 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;
	}

/**
	 * Toggle 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 Subclass
	 *
	 * @param bool $enable True to enable maintenance mode, false to disable.
	 */
	public function maintenance_mode( $enable = false ) {
		global $wp_filesystem;
		$file = $wp_filesystem->abspath() . '.maintenance';
		if ( $enable ) {
			$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 ) ) {
			$this->skin->feedback( 'maintenance_end' );
			$wp_filesystem->delete( $file );
		}
	}

/**
	 * Creates a lock using WordPress options.
	 *
	 * @since 4.5.0
	 *
	 * @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, 'no') /* 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() );

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' );
	}

}

/** 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';

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	admin01/admin01	drwxrwxr-x	2024-01-09 01:37:52
..	dir	-	admin01/admin01	drwxrwxr-x	2024-01-09 01:37:55
admin-filters.php	text/x-php	6.58 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
admin.php	text/x-php	3.47 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
ajax-actions.php	text/x-php	143.76 KB	admin01/admin01	-rw-rw-r--	2024-01-08 04:52:44
bookmark.php	text/x-php	11.44 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:42
class-automatic-upgrader-skin.php	text/x-php	3.48 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
class-bulk-plugin-upgrader-skin.php	text/x-php	2.02 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
class-bulk-theme-upgrader-skin.php	text/x-php	2.05 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
class-bulk-upgrader-skin.php	text/x-php	5.18 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
class-core-upgrader.php	text/x-php	14.65 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
class-custom-background.php	text/x-php	20.32 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:42
class-custom-image-header.php	text/x-php	47.01 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:42
class-file-upload-upgrader.php	text/x-php	3.3 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
class-ftp-pure.php	text/x-php	5.3 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
class-ftp-sockets.php	text/x-php	8.28 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
class-ftp.php	text/x-php	26.57 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
class-language-pack-upgrader-skin.php	text/x-php	2.32 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
class-language-pack-upgrader.php	text/x-php	14.57 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
class-pclzip.php	text/x-php	192.11 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
class-plugin-installer-skin.php	text/x-php	11.59 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:42
class-plugin-upgrader-skin.php	text/x-php	3.2 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:42
class-plugin-upgrader.php	text/x-php	20.96 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
class-theme-installer-skin.php	text/x-php	12.17 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
class-theme-upgrader-skin.php	text/x-php	3.99 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:42
class-theme-upgrader.php	text/x-php	23.78 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
class-walker-category-checklist.php	text/x-php	4.29 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:42
class-walker-nav-menu-checklist.php	text/x-php	5 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
class-walker-nav-menu-edit.php	text/x-php	12.22 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
class-wp-ajax-upgrader-skin.php	text/x-php	3.42 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
class-wp-application-passwords-list-table.php	text/x-php	6.69 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
class-wp-automatic-updater.php	text/x-php	49.28 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
class-wp-comments-list-table.php	text/x-php	29.84 KB	admin01/admin01	-rw-rw-r--	2024-01-08 04:52:44
class-wp-community-events.php	text/x-php	18.03 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
class-wp-debug-data.php	text/x-php	57.12 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
class-wp-filesystem-base.php	text/x-php	22.74 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:42
class-wp-filesystem-direct.php	text/x-php	16.25 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
class-wp-filesystem-ftpext.php	text/x-php	19.67 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
class-wp-filesystem-ftpsockets.php	text/x-php	16.49 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
class-wp-filesystem-ssh2.php	text/x-php	21.5 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
class-wp-importer.php	text/x-php	7.24 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
class-wp-internal-pointers.php	text/x-php	4.43 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
class-wp-links-list-table.php	text/x-php	7.76 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
class-wp-list-table-compat.php	text/x-php	1.46 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
class-wp-list-table.php	text/x-php	40.98 KB	admin01/admin01	-rw-rw-r--	2024-01-08 04:52:44
class-wp-media-list-table.php	text/x-php	23.25 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
class-wp-ms-sites-list-table.php	text/x-php	19.92 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
class-wp-ms-themes-list-table.php	text/x-php	26.74 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:42
class-wp-ms-users-list-table.php	text/x-php	13.78 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
class-wp-plugin-install-list-table.php	text/x-php	22.94 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
class-wp-plugins-list-table.php	text/x-php	41.87 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
class-wp-post-comments-list-table.php	text/x-php	1.44 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
class-wp-posts-list-table.php	text/x-php	58.31 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
class-wp-privacy-data-export-requests-list-table.php	text/x-php	5.41 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
class-wp-privacy-data-removal-requests-list-table.php	text/x-php	5.56 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
class-wp-privacy-policy-content.php	text/x-php	31.43 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
class-wp-privacy-requests-table.php	text/x-php	13.41 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:42
class-wp-screen.php	text/x-php	36.26 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:42
class-wp-site-health-auto-updates.php	text/x-php	12.91 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:42
class-wp-site-health.php	text/x-php	89.08 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:42
class-wp-site-icon.php	text/x-php	6.05 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
class-wp-terms-list-table.php	text/x-php	18.83 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:42
class-wp-theme-install-list-table.php	text/x-php	15.29 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
class-wp-themes-list-table.php	text/x-php	9.95 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
class-wp-upgrader-skin.php	text/x-php	6.16 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
class-wp-upgrader-skins.php	text/x-php	1.44 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:42
class-wp-upgrader.php	text/x-php	35.73 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
class-wp-users-list-table.php	text/x-php	17.91 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
comment.php	text/x-php	5.93 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:42
continents-cities.php	text/x-php	19.99 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:42
credits.php	text/x-php	5.77 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
dashboard.php	text/x-php	65.99 KB	admin01/admin01	-rw-rw-r--	2024-01-08 04:52:44
deprecated.php	text/x-php	39.83 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
edit-tag-messages.php	text/x-php	1.4 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
export.php	text/x-php	23.39 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
file.php	text/x-php	84.3 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:42
image-edit.php	text/x-php	35.57 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
image.php	text/x-php	36.12 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
import.php	text/x-php	6.5 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:42
list-table.php	text/x-php	3.27 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
media.php	text/x-php	114.64 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
menu.php	text/x-php	8.94 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
meta-boxes.php	text/x-php	61.95 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
misc.php	text/x-php	42.97 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:42
ms-admin-filters.php	text/x-php	1.34 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:42
ms-deprecated.php	text/x-php	2.96 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
ms.php	text/x-php	33.19 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
nav-menu.php	text/x-php	45.65 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:42
network.php	text/x-php	24.54 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
noop.php	text/x-php	1.06 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
options.php	text/x-php	4.06 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
plugin-install.php	text/x-php	33.74 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:42
plugin.php	text/x-php	86.31 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:42
post.php	text/x-php	73.13 KB	admin01/admin01	-rw-rw-r--	2024-01-08 04:52:44
privacy-tools.php	text/x-php	32.77 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
revision.php	text/x-php	15.76 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
schema.php	text/x-php	41.12 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:42
screen.php	text/x-php	6.21 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
taxonomy.php	text/x-php	7.8 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
template.php	text/x-php	91.87 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:42
theme-install.php	text/x-php	6.43 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
theme.php	text/x-php	43.77 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:42
translation-install.php	text/x-php	8.66 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
update-core.php	text/x-php	61.72 KB	admin01/admin01	-rw-rw-r--	2024-01-08 04:52:40
update.php	text/x-php	34.17 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
upgrade.php	text/x-php	106.3 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40
user.php	text/x-php	21.89 KB	admin01/admin01	-rw-rw-r--	2024-01-08 04:52:44
widgets.php	text/x-php	10.54 KB	admin01/admin01	-rw-rw-r--	2023-02-15 02:40:40