cloudformation_diff.py 文件源码

def cfndiff_module_validation(module):
    '''
    Validate for correct module call/usage in ansible.
    '''
    # Boto3 is required!
    if not HAS_BOTO3:
        module.fail_json(msg='boto3 is required. Try pip install boto3')

    # cfn_flip is required!
    if not HAS_CFN_FLIP:
        module.fail_json(msg='cfn_flip is required. Try pip install cfn_flip')

    template = module.params['template']
    b_template = to_bytes(template, errors='surrogate_or_strict')

    # Validate path of template
    if not os.path.exists(b_template):
        module.fail_json(msg="template %s not found" % (template))
    if not os.access(b_template, os.R_OK):
        module.fail_json(msg="template %s not readable" % (template))
    if os.path.isdir(b_template):
        module.fail_json(msg="diff does not support recursive diff of directory: %s" % (template))

    return module