pre_auto_update action-hook . WP 4.4.0

Fires immediately prior to an auto-update.

Usage

add_action( 'pre_auto_update', 'action_function_name_666', 10, 3 );
function action_function_name_666( $type, $item, $context ){
	// action...
}

$type(string)

The type of update being checked: 'core', 'theme', 'plugin', or 'translation'.

$item(object)

The update offer.

$context(string)

The filesystem context (a path) against which filesystem access and status should be checked.

Where the hook is called

do_action( 'pre_auto_update', $type, $item, $context );

Where the hook is used (in WP core)