def selfupdate(composer=None, php=None, runas=None, quiet=False, composer_home='/root'):
 result = _run_composer('selfupdate', extra_flags='--no-progress', composer=composer, php=php, runas=runas, quiet=quiet, composer_home=composer_home)
 return result

def selfupdate ( composer = None , php = None , runas = None , quiet = False , composer_home = '/root' ) : result = _run_composer ( 'selfupdate' , extra_flags = '--no-progress' , composer = composer , php = php , runas = runas , quiet = quiet , composer_home = composer_home ) return result
update composer itself .