How to deploy SAM template using boto3

Question

I am trying to deploy https://s3.amazonaws.com/serverless-chatbot-code/chatbot.yaml using boto3 library function create_stack but getting an error

"CreateStack cannot be used with templates containing Transforms"

How can I deploy this stack with boto3?

Thanks.

Answer 1

The comment is correct, you have to first create a change set and then execute the change set after change set creation is complete. Code outline is given below

client = boto3.client('cloudformation')

# Helper function to retrieve change set status
def changeSetStatus(change_set_name, client):
    response = client.describe_change_set(
      ChangeSetName=change_set_name,
    )
    return response['Status']

# Create change set
cs_response = client.create_change_set(
  StackName=stackname,
  TemplateURL=templateurl,
  Parameters=params,
  Capabilities=[capabilities],
  ChangeSetType="CREATE",
  ChangeSetName=stackname + "-cs"
)

#Remove print statements, here for illustration
print(str(cs_response))

change_set_name = cs_response['Id']

# Wait until change set status is CREATE_COMPLETE
while True:
  response = change_set_status(change_set_name, client)
  print(str(response))
  time.sleep(10)
  if response == 'CREATE_COMPLETE':
      break

# Execute change set
ex_response = client.execute_change_set(
  ChangeSetName=change_set_name
)