def _dusty_vm_exists():
existing_vms = check_output_demoted(['<STR_LIT>', '<STR_LIT:list>', '<STR_LIT>'])<EOL>for line in existing_vms.splitlines():<EOL><INDENT>if '<STR_LIT>'.format(constants.VM_MACHINE_NAME) in line:<EOL><INDENT>return True<EOL><DEDENT><DEDENT>return False<EOL>
We use VBox directly instead of Docker Machine because it
    shaves about 0.5 seconds off the runtime of this check.