Hmm.....playing around a bit, I now get the following errors:
exception 'missing_option_exception' with message 'Missing required option: dataroot' in mdeploy.php:363 Stack trace: #0 mdeploy.php(157): input_manager->get_required_option('dataroot') #1 mdeploy.php(838): input_manager->get_option('dataroot') #2 mdeploy.php(714): worker->authorize() #3 mdeploy.php(1399): worker->execute() #4 {main}