func validateStack(svc *cloudformation.CloudFormation, stackBody string) (string, error) {
input := &cloudformation.ValidateTemplateInput{
TemplateBody: aws.String(stackBody),
}
validationReport, err := svc.ValidateTemplate(input)
if err != nil {
return "", fmt.Errorf("Invalid cloudformation stack: %v", err)
}
return validationReport.String(), err
}