The Cloudformation resources AWS::Cloudformation::WaitCondition and AWS::Cloudformation::WaitConditionHandle cannot currently be updated or recreated. To wait for resource signaling during a stack update a new WaitCondition resource needs to be created. This macro will create new WaitCondition resources based on changes to specified parameters.
# Unit Test python3 -m unittest
Note
S3 Bucket must already exist
Set any required AWS CLI env variables. http://docs.aws.amazon.com/cli/latest/userguide/cli-environment.html
./build.sh
aws cloudformation package \ --template deploy-macro.yaml \ --s3-bucket <YOUR S3 BUCKET> \ --output-template-file packaged-deploy-macro.yaml
aws cloudformation deploy \ --template-file packaged-deploy-macro.yaml \ --stack-name cloudformation-macro-WaitConditionUpdate \ --capabilities CAPABILITY_IAM
Your template must have contain the parameter WaitConditionUpdateParameters and Transform. When the parameters of WaitConditionUpdateParameters change the logical ids of all WaitCondition resources will be renamed.
Transform: ['WaitConditionUpdate']
Parameters:
WaitConditionUpdateParameters:
Description: Used by the WaitConditionUpdate transform macro to determine which
parameter values will be used for naming any WaitCondition resources. The
parameters must only be those which will trigger a recreation of the signaling
resource when changed.
Type: CommaDelimitedList
Default: "PutDefaultsHere"
Use a WaitCondition to get a signal when tasks are healthy in a ECS Service