Source
File: wp-admin/includes/class-plugin-upgrader.php
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',
),
)
);
// Cleanup our hooks, in case something else does a 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;
}