from rally.deployment.engines import existing


NEW_SCHEMA = {"type": }

def create(...):
    config = json.loads()
    try:
        jsonschema.validate(config, existing.ExistingCloud.CONFIG_SCHEMA)
    except ValidationError:
        # convert from new to old format
        new_config = {"type": "ExistingCloud", "creds": config}
        try:
            jsonschema.validate(config, existing.ExistingCloud.CONFIG_SCHEMA)
        except ValidationError:
            raiase
        else:
            config = new_config