def update_config(configuration=None, add=None):
    """
    Update the environments configuration on-disk.
    """
    existing_config = config()
    conf = config_path()
    print(style_header('Zookeeper Environments'))
    print("")
    print(style_text('config:', TITLE_STYLE, pad=2), end='')
    print(style_text(conf, INPUT_STYLE))
    print(style_multiline(json.dumps(existing_config, indent=4, sort_keys=True), INFO_STYLE, lpad=4))