FM / includes

/var/www/p4ela.net/www/wp-admin/includes/

/var/www/p4ela.net/www/wp-admin/includes

Name	Size	Mode	Actions
admin-filters.php	8082	0666	edit dl rm
admin.php	3628	0666	edit dl rm
ajax-actions.php	151627	0666	edit dl rm
bookmark.php	11615	0666	edit dl rm
class-automatic-upgrader-skin.php	3663	0666	edit dl rm
class-bulk-plugin-upgrader-skin.php	2590	0666	edit dl rm
class-bulk-theme-upgrader-skin.php	2660	0666	edit dl rm
class-bulk-upgrader-skin.php	6753	0666	edit dl rm
class-core-upgrader.php	15191	0666	edit dl rm
class-custom-background.php	21619	0666	edit dl rm
class-custom-image-header.php	49064	0666	edit dl rm
class-file-upload-upgrader.php	4163	0666	edit dl rm
class-ftp-pure.php	5426	0666	edit dl rm
class-ftp-sockets.php	8479	0666	edit dl rm
class-ftp.php	27304	0666	edit dl rm
class-language-pack-upgrader-skin.php	2870	0666	edit dl rm
class-language-pack-upgrader.php	15561	0666	edit dl rm
class-pclzip.php	196700	0666	edit dl rm
class-plugin-installer-skin.php	12053	0666	edit dl rm
class-plugin-upgrader-skin.php	3278	0666	edit dl rm
class-plugin-upgrader.php	23243	0666	edit dl rm
class-theme-installer-skin.php	12734	0666	edit dl rm
class-theme-upgrader-skin.php	4176	0666	edit dl rm
class-theme-upgrader.php	26702	0666	edit dl rm
class-walker-category-checklist.php	5091	0666	edit dl rm
class-walker-nav-menu-checklist.php	5708	0666	edit dl rm
class-walker-nav-menu-edit.php	14265	0666	edit dl rm
class-wp-ajax-upgrader-skin.php	4193	0666	edit dl rm
class-wp-application-passwords-list-table.php	6949	0666	edit dl rm
class-wp-automatic-updater.php	61136	0666	edit dl rm
class-wp-comments-list-table.php	32918	0666	edit dl rm
class-wp-community-events.php	18769	0666	edit dl rm
class-wp-debug-data.php	65288	0666	edit dl rm
class-wp-filesystem-base.php	24410	0666	edit dl rm
class-wp-filesystem-direct.php	18143	0666	edit dl rm
class-wp-filesystem-ftpext.php	23101	0666	edit dl rm
class-wp-filesystem-ftpsockets.php	18479	0666	edit dl rm
class-wp-filesystem-ssh2.php	23310	0666	edit dl rm
class-wp-importer.php	7465	0666	edit dl rm
class-wp-internal-pointers.php	4577	0666	edit dl rm
class-wp-links-list-table.php	9241	0666	edit dl rm
class-wp-list-table-compat.php	1497	0666	edit dl rm
class-wp-list-table.php	52864	0666	edit dl rm
class-wp-media-list-table.php	25629	0666	edit dl rm
class-wp-ms-sites-list-table.php	22026	0666	edit dl rm
class-wp-ms-themes-list-table.php	28334	0666	edit dl rm
class-wp-ms-users-list-table.php	15287	0666	edit dl rm
class-wp-plugin-install-list-table.php	24786	0666	edit dl rm
class-wp-plugins-list-table.php	57786	0666	edit dl rm
class-wp-post-comments-list-table.php	1453	0666	edit dl rm
class-wp-posts-list-table.php	63946	0666	edit dl rm
class-wp-privacy-data-export-requests-list-table.php	5563	0666	edit dl rm
class-wp-privacy-data-removal-requests-list-table.php	5715	0666	edit dl rm
class-wp-privacy-policy-content.php	32777	0666	edit dl rm
class-wp-privacy-requests-table.php	13974	0666	edit dl rm
class-wp-screen.php	37327	0666	edit dl rm
class-wp-site-health-auto-updates.php	13561	0666	edit dl rm
class-wp-site-health.php	122364	0666	edit dl rm
class-wp-site-icon.php	6414	0666	edit dl rm
class-wp-terms-list-table.php	21182	0666	edit dl rm
class-wp-theme-install-list-table.php	15792	0666	edit dl rm
class-wp-themes-list-table.php	10344	0666	edit dl rm
class-wp-upgrader-skin.php	7110	0666	edit dl rm
class-wp-upgrader-skins.php	1477	0666	edit dl rm
class-wp-upgrader.php	47695	0666	edit dl rm
class-wp-users-list-table.php	19058	0666	edit dl rm
comment.php	6121	0666	edit dl rm
continents-cities.php	20540	0666	edit dl rm
credits.php	5864	0666	edit dl rm
dashboard.php	69710	0666	edit dl rm
deprecated.php	41776	0666	edit dl rm
edit-tag-messages.php	1478	0666	edit dl rm
export.php	25565	0666	edit dl rm
file.php	97575	0666	edit dl rm
image-edit.php	43850	0666	edit dl rm
image.php	43422	0666	edit dl rm
import.php	6617	0666	edit dl rm
list-table.php	3802	0666	edit dl rm
media.php	118870	0666	edit dl rm
menu.php	9618	0666	edit dl rm
meta-boxes.php	66084	0666	edit dl rm
misc.php	46465	0666	edit dl rm
ms-admin-filters.php	1296	0666	edit dl rm
ms-deprecated.php	3770	0666	edit dl rm
ms.php	33958	0666	edit dl rm
nav-menu.php	48905	0666	edit dl rm
network.php	26980	0666	edit dl rm
noop.php	1148	0666	edit dl rm
options.php	4251	0666	edit dl rm
plugin-install.php	39474	0666	edit dl rm
plugin.php	92925	0666	edit dl rm
post.php	81683	0666	edit dl rm
privacy-tools.php	33462	0666	edit dl rm
revision.php	16496	0666	edit dl rm
schema.php	42659	0666	edit dl rm
screen.php	6378	0666	edit dl rm
taxonomy.php	8424	0666	edit dl rm
template.php	98626	0666	edit dl rm
theme-install.php	6990	0666	edit dl rm
theme.php	47742	0666	edit dl rm
translation-install.php	11075	0666	edit dl rm
update-core.php	69331	0666	edit dl rm
update.php	34429	0666	edit dl rm
upgrade.php	113892	0666	edit dl rm
user.php	23740	0666	edit dl rm
widgets.php	10912	0666	edit dl rm

Edit: /var/www/p4ela.net/www/wp-admin/includes/class-plugin-upgrader.php (23243B)

<?php
/**
 * Upgrade API: Plugin_Upgrader class
 *
 * @package WordPress
 * @subpackage Upgrader
 * @since 4.6.0
 */

/**
 * Core class used for upgrading/installing plugins.
 *
 * It is designed to upgrade/install plugins from a local zip, remote zip URL,
 * or uploaded zip file.
 *
 * @since 2.8.0
 * @since 4.6.0 Moved to its own file from wp-admin/includes/class-wp-upgrader.php.
 *
 * @see WP_Upgrader
 */
class Plugin_Upgrader extends WP_Upgrader {

/**
	 * Plugin upgrade result.
	 *
	 * @since 2.8.0
	 * @var array|WP_Error $result
	 *
	 * @see WP_Upgrader::$result
	 */
	public $result;

/**
	 * Whether a bulk upgrade/installation is being performed.
	 *
	 * @since 2.9.0
	 * @var bool $bulk
	 */
	public $bulk = false;

/**
	 * New plugin info.
	 *
	 * @since 5.5.0
	 * @var array $new_plugin_data
	 *
	 * @see check_package()
	 */
	public $new_plugin_data = array();

/**
	 * Initializes the upgrade strings.
	 *
	 * @since 2.8.0
	 */
	public function upgrade_strings() {
		$this->strings['up_to_date'] = __( 'The plugin is at the latest version.' );
		$this->strings['no_package'] = __( 'Update package not available.' );
		/* translators: %s: Package URL. */
		$this->strings['downloading_package'] = sprintf( __( 'Downloading update from %s&#8230;' ), '%s' );
		$this->strings['unpack_package'] = __( 'Unpacking the update&#8230;' );
		$this->strings['remove_old'] = __( 'Removing the old version of the plugin&#8230;' );
		$this->strings['remove_old_failed'] = __( 'Could not remove the old plugin.' );
		$this->strings['process_failed'] = __( 'Plugin update failed.' );
		$this->strings['process_success'] = __( 'Plugin updated successfully.' );
		$this->strings['process_bulk_success'] = __( 'Plugins updated successfully.' );
	}

/**
	 * Initializes the installation strings.
	 *
	 * @since 2.8.0
	 */
	public function install_strings() {
		$this->strings['no_package'] = __( 'Installation package not available.' );
		/* translators: %s: Package URL. */
		$this->strings['downloading_package'] = sprintf( __( 'Downloading installation package from %s&#8230;' ), '%s' );
		$this->strings['unpack_package'] = __( 'Unpacking the package&#8230;' );
		$this->strings['installing_package'] = __( 'Installing the plugin&#8230;' );
		$this->strings['remove_old'] = __( 'Removing the current plugin&#8230;' );
		$this->strings['remove_old_failed'] = __( 'Could not remove the current plugin.' );
		$this->strings['no_files'] = __( 'The plugin contains no files.' );
		$this->strings['process_failed'] = __( 'Plugin installation failed.' );
		$this->strings['process_success'] = __( 'Plugin installed successfully.' );
		/* translators: 1: Plugin name, 2: Plugin version. */
		$this->strings['process_success_specific'] = __( 'Successfully installed the plugin %1$s %2$s.' );

if ( ! empty( $this->skin->overwrite ) ) {
			if ( 'update-plugin' === $this->skin->overwrite ) {
				$this->strings['installing_package'] = __( 'Updating the plugin&#8230;' );
				$this->strings['process_failed']     = __( 'Plugin update failed.' );
				$this->strings['process_success']    = __( 'Plugin updated successfully.' );
			}

if ( 'downgrade-plugin' === $this->skin->overwrite ) {
				$this->strings['installing_package'] = __( 'Downgrading the plugin&#8230;' );
				$this->strings['process_failed']     = __( 'Plugin downgrade failed.' );
				$this->strings['process_success']    = __( 'Plugin downgraded successfully.' );
			}
		}
	}

/**
	 * Install a plugin package.
	 *
	 * @since 2.8.0
	 * @since 3.7.0 The `$args` parameter was added, making clearing the plugin update cache optional.
	 *
	 * @param string $package The full local path or URI of the package.
	 * @param array  $args {
	 *     Optional. Other arguments for installing a plugin package. Default empty array.
	 *
	 *     @type bool $clear_update_cache Whether to clear the plugin updates cache if successful.
	 *                                    Default true.
	 * }
	 * @return bool|WP_Error True if the installation was successful, false or a WP_Error otherwise.
	 */
	public function install( $package, $args = array() ) {
		$defaults    = array(
			'clear_update_cache' => true,
			'overwrite_package'  => false, // Do not overwrite files.
		);
		$parsed_args = wp_parse_args( $args, $defaults );

$this->init();
		$this->install_strings();

add_filter( 'upgrader_source_selection', array( $this, 'check_package' ) );

if ( $parsed_args['clear_update_cache'] ) {
			// Clear cache so wp_update_plugins() knows about the new plugin.
			add_action( 'upgrader_process_complete', 'wp_clean_plugins_cache', 9, 0 );
		}

$this->run(
			array(
				'package'           => $package,
				'destination'       => WP_PLUGIN_DIR,
				'clear_destination' => $parsed_args['overwrite_package'],
				'clear_working'     => true,
				'hook_extra'        => array(
					'type'   => 'plugin',
					'action' => 'install',
				),
			)
		);

remove_action( 'upgrader_process_complete', 'wp_clean_plugins_cache', 9 );
		remove_filter( 'upgrader_source_selection', array( $this, 'check_package' ) );

if ( ! $this->result || is_wp_error( $this->result ) ) {
			return $this->result;
		}

// Force refresh of plugin update information.
		wp_clean_plugins_cache( $parsed_args['clear_update_cache'] );

if ( $parsed_args['overwrite_package'] ) {
			/**
			 * Fires when the upgrader has successfully overwritten a currently installed
			 * plugin or theme with an uploaded zip package.
			 *
			 * @since 5.5.0
			 *
			 * @param string  $package      The package file.
			 * @param array   $data         The new plugin or theme data.
			 * @param string  $package_type The package type ('plugin' or 'theme').
			 */
			do_action( 'upgrader_overwrote_package', $package, $this->new_plugin_data, 'plugin' );
		}

return true;
	}

/**
	 * Upgrades a plugin.
	 *
	 * @since 2.8.0
	 * @since 3.7.0 The `$args` parameter was added, making clearing the plugin update cache optional.
	 *
	 * @param string $plugin Path to the plugin file relative to the plugins directory.
	 * @param array  $args {
	 *     Optional. Other arguments for upgrading a plugin package. Default empty array.
	 *
	 *     @type bool $clear_update_cache Whether to clear the plugin updates cache if successful.
	 *                                    Default true.
	 * }
	 * @return bool|WP_Error True if the upgrade was successful, false or a WP_Error object otherwise.
	 */
	public function upgrade( $plugin, $args = array() ) {
		$defaults    = array(
			'clear_update_cache' => true,
		);
		$parsed_args = wp_parse_args( $args, $defaults );

$this->init();
		$this->upgrade_strings();

$current = get_site_transient( 'update_plugins' );
		if ( ! isset( $current->response[ $plugin ] ) ) {
			$this->skin->before();
			$this->skin->set_result( false );
			$this->skin->error( 'up_to_date' );
			$this->skin->after();
			return false;
		}

// Get the URL to the zip file.
		$r = $current->response[ $plugin ];

add_filter( 'upgrader_pre_install', array( $this, 'deactivate_plugin_before_upgrade' ), 10, 2 );
		add_filter( 'upgrader_pre_install', array( $this, 'active_before' ), 10, 2 );
		add_filter( 'upgrader_clear_destination', array( $this, 'delete_old_plugin' ), 10, 4 );
		add_filter( 'upgrader_post_install', array( $this, 'active_after' ), 10, 2 );
		/*
		 * There's a Trac ticket to move up the directory for zips which are made a bit differently, useful for non-.org plugins.
		 * 'source_selection' => array( $this, 'source_selection' ),
		 */
		if ( $parsed_args['clear_update_cache'] ) {
			// Clear cache so wp_update_plugins() knows about the new plugin.
			add_action( 'upgrader_process_complete', 'wp_clean_plugins_cache', 9, 0 );
		}

$this->run(
			array(
				'package'           => $r->package,
				'destination'       => WP_PLUGIN_DIR,
				'clear_destination' => true,
				'clear_working'     => true,
				'hook_extra'        => array(
					'plugin'      => $plugin,
					'type'        => 'plugin',
					'action'      => 'update',
					'temp_backup' => array(
						'slug' => dirname( $plugin ),
						'src'  => WP_PLUGIN_DIR,
						'dir'  => 'plugins',
					),
				),
			)
		);

// Cleanup our hooks, in case something else does an upgrade on this connection.
		remove_action( 'upgrader_process_complete', 'wp_clean_plugins_cache', 9 );
		remove_filter( 'upgrader_pre_install', array( $this, 'deactivate_plugin_before_upgrade' ) );
		remove_filter( 'upgrader_pre_install', array( $this, 'active_before' ) );
		remove_filter( 'upgrader_clear_destination', array( $this, 'delete_old_plugin' ) );
		remove_filter( 'upgrader_post_install', array( $this, 'active_after' ) );

if ( ! $this->result || is_wp_error( $this->result ) ) {
			return $this->result;
		}

// Force refresh of plugin update information.
		wp_clean_plugins_cache( $parsed_args['clear_update_cache'] );

/*
		 * Ensure any future auto-update failures trigger a failure email by removing
		 * the last failure notification from the list when plugins update successfully.
		 */
		$past_failure_emails = get_option( 'auto_plugin_theme_update_emails', array() );

if ( isset( $past_failure_emails[ $plugin ] ) ) {
			unset( $past_failure_emails[ $plugin ] );
			update_option( 'auto_plugin_theme_update_emails', $past_failure_emails );
		}

return true;
	}

/**
	 * Upgrades several plugins at once.
	 *
	 * @since 2.8.0
	 * @since 3.7.0 The `$args` parameter was added, making clearing the plugin update cache optional.
	 *
	 * @param string[] $plugins Array of paths to plugin files relative to the plugins directory.
	 * @param array    $args {
	 *     Optional. Other arguments for upgrading several plugins at once.
	 *
	 *     @type bool $clear_update_cache Whether to clear the plugin updates cache if successful. Default true.
	 * }
	 * @return array|false An array of results indexed by plugin file, or false if unable to connect to the filesystem.
	 */
	public function bulk_upgrade( $plugins, $args = array() ) {
		$wp_version = wp_get_wp_version();

$defaults    = array(
			'clear_update_cache' => true,
		);
		$parsed_args = wp_parse_args( $args, $defaults );

$this->init();
		$this->bulk = true;
		$this->upgrade_strings();

$current = get_site_transient( 'update_plugins' );

add_filter( 'upgrader_clear_destination', array( $this, 'delete_old_plugin' ), 10, 4 );

$this->skin->header();

// Connect to the filesystem first.
		$res = $this->fs_connect( array( WP_CONTENT_DIR, WP_PLUGIN_DIR ) );
		if ( ! $res ) {
			$this->skin->footer();
			return false;
		}

$this->skin->bulk_header();

/*
		 * Only start maintenance mode if:
		 * - running Multisite and there are one or more plugins specified, OR
		 * - a plugin with an update available is currently active.
		 * @todo For multisite, maintenance mode should only kick in for individual sites if at all possible.
		 */
		$maintenance = ( is_multisite() && ! empty( $plugins ) );
		foreach ( $plugins as $plugin ) {
			$maintenance = $maintenance || ( is_plugin_active( $plugin ) && isset( $current->response[ $plugin ] ) );
		}
		if ( $maintenance ) {
			$this->maintenance_mode( true );
		}

$results = array();

$this->update_count   = count( $plugins );
		$this->update_current = 0;
		foreach ( $plugins as $plugin ) {
			++$this->update_current;
			$this->skin->plugin_info = get_plugin_data( WP_PLUGIN_DIR . '/' . $plugin, false, true );

if ( ! isset( $current->response[ $plugin ] ) ) {
				$this->skin->set_result( 'up_to_date' );
				$this->skin->before();
				$this->skin->feedback( 'up_to_date' );
				$this->skin->after();
				$results[ $plugin ] = true;
				continue;
			}

// Get the URL to the zip file.
			$r = $current->response[ $plugin ];

$this->skin->plugin_active = is_plugin_active( $plugin );

if ( isset( $r->requires ) && ! is_wp_version_compatible( $r->requires ) ) {
				$result = new WP_Error(
					'incompatible_wp_required_version',
					sprintf(
						/* translators: 1: Current WordPress version, 2: WordPress version required by the new plugin version. */
						__( 'Your WordPress version is %1$s, however the new plugin version requires %2$s.' ),
						$wp_version,
						$r->requires
					)
				);

$this->skin->before( $result );
				$this->skin->error( $result );
				$this->skin->after();
			} elseif ( isset( $r->requires_php ) && ! is_php_version_compatible( $r->requires_php ) ) {
				$result = new WP_Error(
					'incompatible_php_required_version',
					sprintf(
						/* translators: 1: Current PHP version, 2: PHP version required by the new plugin version. */
						__( 'The PHP version on your server is %1$s, however the new plugin version requires %2$s.' ),
						PHP_VERSION,
						$r->requires_php
					)
				);

$this->skin->before( $result );
				$this->skin->error( $result );
				$this->skin->after();
			} else {
				add_filter( 'upgrader_source_selection', array( $this, 'check_package' ) );
				$result = $this->run(
					array(
						'package'           => $r->package,
						'destination'       => WP_PLUGIN_DIR,
						'clear_destination' => true,
						'clear_working'     => true,
						'is_multi'          => true,
						'hook_extra'        => array(
							'plugin'      => $plugin,
							'temp_backup' => array(
								'slug' => dirname( $plugin ),
								'src'  => WP_PLUGIN_DIR,
								'dir'  => 'plugins',
							),
						),
					)
				);
				remove_filter( 'upgrader_source_selection', array( $this, 'check_package' ) );
			}

$results[ $plugin ] = $result;

// Prevent credentials auth screen from displaying multiple times.
			if ( false === $result ) {
				break;
			}
		} // End foreach $plugins.

$this->maintenance_mode( false );

// Force refresh of plugin update information.
		wp_clean_plugins_cache( $parsed_args['clear_update_cache'] );

/** This action is documented in wp-admin/includes/class-wp-upgrader.php */
		do_action(
			'upgrader_process_complete',
			$this,
			array(
				'action'  => 'update',
				'type'    => 'plugin',
				'bulk'    => true,
				'plugins' => $plugins,
			)
		);

$this->skin->bulk_footer();

$this->skin->footer();

// Cleanup our hooks, in case something else does an upgrade on this connection.
		remove_filter( 'upgrader_clear_destination', array( $this, 'delete_old_plugin' ) );

foreach ( $results as $plugin => $result ) {
			// Maintain last failure notification when plugins failed to update manually.
			if ( ! $result || is_wp_error( $result ) || ! isset( $past_failure_emails[ $plugin ] ) ) {
				continue;
			}

unset( $past_failure_emails[ $plugin ] );
		}

update_option( 'auto_plugin_theme_update_emails', $past_failure_emails );

return $results;
	}

/**
	 * Checks that the source package contains a valid plugin.
	 *
	 * Hooked to the {@see 'upgrader_source_selection'} filter by Plugin_Upgrader::install().
	 *
	 * @since 3.3.0
	 *
	 * @global WP_Filesystem_Base $wp_filesystem WordPress filesystem subclass.
	 *
	 * @param string $source The path to the downloaded package source.
	 * @return string|WP_Error The source as passed, or a WP_Error object on failure.
	 */
	public function check_package( $source ) {
		global $wp_filesystem;

$wp_version            = wp_get_wp_version();
		$this->new_plugin_data = array();

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

$working_directory = str_replace( $wp_filesystem->wp_content_dir(), trailingslashit( WP_CONTENT_DIR ), $source );
		if ( ! is_dir( $working_directory ) ) { // Confidence check, if the above fails, let's not prevent installation.
			return $source;
		}

// Check that the folder contains at least 1 valid plugin.
		$files = glob( $working_directory . '*.php' );
		if ( $files ) {
			foreach ( $files as $file ) {
				$info = get_plugin_data( $file, false, false );
				if ( ! empty( $info['Name'] ) ) {
					$this->new_plugin_data = $info;
					break;
				}
			}
		}

if ( empty( $this->new_plugin_data ) ) {
			return new WP_Error( 'incompatible_archive_no_plugins', $this->strings['incompatible_archive'], __( 'No valid plugins were found.' ) );
		}

$requires_php = isset( $info['RequiresPHP'] ) ? $info['RequiresPHP'] : null;
		$requires_wp  = isset( $info['RequiresWP'] ) ? $info['RequiresWP'] : null;

if ( ! is_php_version_compatible( $requires_php ) ) {
			$error = sprintf(
				/* translators: 1: Current PHP version, 2: Version required by the uploaded plugin. */
				__( 'The PHP version on your server is %1$s, however the uploaded plugin requires %2$s.' ),
				PHP_VERSION,
				$requires_php
			);

return new WP_Error( 'incompatible_php_required_version', $this->strings['incompatible_archive'], $error );
		}

if ( ! is_wp_version_compatible( $requires_wp ) ) {
			$error = sprintf(
				/* translators: 1: Current WordPress version, 2: Version required by the uploaded plugin. */
				__( 'Your WordPress version is %1$s, however the uploaded plugin requires %2$s.' ),
				$wp_version,
				$requires_wp
			);

return new WP_Error( 'incompatible_wp_required_version', $this->strings['incompatible_archive'], $error );
		}

return $source;
	}

/**
	 * Retrieves the path to the file that contains the plugin info.
	 *
	 * This isn't used internally in the class, but is called by the skins.
	 *
	 * @since 2.8.0
	 *
	 * @return string|false The full path to the main plugin file, or false.
	 */
	public function plugin_info() {
		if ( ! is_array( $this->result ) ) {
			return false;
		}
		if ( empty( $this->result['destination_name'] ) ) {
			return false;
		}

// Ensure to pass with leading slash.
		$plugin = get_plugins( '/' . $this->result['destination_name'] );
		if ( empty( $plugin ) ) {
			return false;
		}

// Assume the requested plugin is the first in the list.
		$pluginfiles = array_keys( $plugin );

return $this->result['destination_name'] . '/' . $pluginfiles[0];
	}

/**
	 * Deactivates a plugin before it is upgraded.
	 *
	 * Hooked to the {@see 'upgrader_pre_install'} filter by Plugin_Upgrader::upgrade().
	 *
	 * @since 2.8.0
	 * @since 4.1.0 Added a return value.
	 *
	 * @param bool|WP_Error $response The installation response before the installation has started.
	 * @param array         $plugin   Plugin package arguments.
	 * @return bool|WP_Error The original `$response` parameter or WP_Error.
	 */
	public function deactivate_plugin_before_upgrade( $response, $plugin ) {

if ( is_wp_error( $response ) ) { // Bypass.
			return $response;
		}

// When in cron (background updates) don't deactivate the plugin, as we require a browser to reactivate it.
		if ( wp_doing_cron() ) {
			return $response;
		}

$plugin = isset( $plugin['plugin'] ) ? $plugin['plugin'] : '';
		if ( empty( $plugin ) ) {
			return new WP_Error( 'bad_request', $this->strings['bad_request'] );
		}

if ( is_plugin_active( $plugin ) ) {
			// Deactivate the plugin silently, Prevent deactivation hooks from running.
			deactivate_plugins( $plugin, true );
		}

return $response;
	}

/**
	 * Turns on maintenance mode before attempting to background update an active plugin.
	 *
	 * Hooked to the {@see 'upgrader_pre_install'} filter by Plugin_Upgrader::upgrade().
	 *
	 * @since 5.4.0
	 *
	 * @param bool|WP_Error $response The installation response before the installation has started.
	 * @param array         $plugin   Plugin package arguments.
	 * @return bool|WP_Error The original `$response` parameter or WP_Error.
	 */
	public function active_before( $response, $plugin ) {
		if ( is_wp_error( $response ) ) {
			return $response;
		}

// Only enable maintenance mode when in cron (background update).
		if ( ! wp_doing_cron() ) {
			return $response;
		}

$plugin = isset( $plugin['plugin'] ) ? $plugin['plugin'] : '';

// Only run if plugin is active.
		if ( ! is_plugin_active( $plugin ) ) {
			return $response;
		}

// Change to maintenance mode. Bulk edit handles this separately.
		if ( ! $this->bulk ) {
			$this->maintenance_mode( true );
		}

return $response;
	}

/**
	 * Turns off maintenance mode after upgrading an active plugin.
	 *
	 * Hooked to the {@see 'upgrader_post_install'} filter by Plugin_Upgrader::upgrade().
	 *
	 * @since 5.4.0
	 *
	 * @param bool|WP_Error $response The installation response after the installation has finished.
	 * @param array         $plugin   Plugin package arguments.
	 * @return bool|WP_Error The original `$response` parameter or WP_Error.
	 */
	public function active_after( $response, $plugin ) {
		if ( is_wp_error( $response ) ) {
			return $response;
		}

// Only disable maintenance mode when in cron (background update).
		if ( ! wp_doing_cron() ) {
			return $response;
		}

$plugin = isset( $plugin['plugin'] ) ? $plugin['plugin'] : '';

// Only run if plugin is active.
		if ( ! is_plugin_active( $plugin ) ) {
			return $response;
		}

// Time to remove maintenance mode. Bulk edit handles this separately.
		if ( ! $this->bulk ) {
			$this->maintenance_mode( false );
		}

return $response;
	}

/**
	 * Deletes the old plugin during an upgrade.
	 *
	 * Hooked to the {@see 'upgrader_clear_destination'} filter by
	 * Plugin_Upgrader::upgrade() and Plugin_Upgrader::bulk_upgrade().
	 *
	 * @since 2.8.0
	 *
	 * @global WP_Filesystem_Base $wp_filesystem WordPress filesystem subclass.
	 *
	 * @param bool|WP_Error $removed            Whether the destination was cleared.
	 *                                          True on success, WP_Error on failure.
	 * @param string        $local_destination  The local package destination.
	 * @param string        $remote_destination The remote package destination.
	 * @param array         $plugin             Extra arguments passed to hooked filters.
	 * @return bool|WP_Error
	 */
	public function delete_old_plugin( $removed, $local_destination, $remote_destination, $plugin ) {
		global $wp_filesystem;

if ( is_wp_error( $removed ) ) {
			return $removed; // Pass errors through.
		}

$plugin = isset( $plugin['plugin'] ) ? $plugin['plugin'] : '';
		if ( empty( $plugin ) ) {
			return new WP_Error( 'bad_request', $this->strings['bad_request'] );
		}

$plugins_dir     = $wp_filesystem->wp_plugins_dir();
		$this_plugin_dir = trailingslashit( dirname( $plugins_dir . $plugin ) );

if ( ! $wp_filesystem->exists( $this_plugin_dir ) ) { // If it's already vanished.
			return $removed;
		}

/*
		 * If plugin is in its own directory, recursively delete the directory.
		 * Base check on if plugin includes directory separator AND that it's not the root plugin folder.
		 */
		if ( strpos( $plugin, '/' ) && $this_plugin_dir !== $plugins_dir ) {
			$deleted = $wp_filesystem->delete( $this_plugin_dir, true );
		} else {
			$deleted = $wp_filesystem->delete( $plugins_dir . $plugin );
		}

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

return true;
	}
}

cmd: