Declarative Agent Declaration Doesn't Allow Using Fargate

[ghost]

When using the declarative agent declaration to define or extend an agent with the Fargate launch type, the plugin fails to register the Task Definition with an error that states:

[jenkins-60gn8]: Error in provisioning; agent=com.cloudbees.jenkins.plugins.amazonecs.ECSSlave[jenkins-60gn8]
com.amazonaws.services.ecs.model.ClientException: Fargate requires task definition to have execution role ARN to support ECR images. (Service: AmazonECS; Status Code: 400; Error Code: ClientException; Request ID: eb36ec6a-6c41-11e9-ae73-89fda2289aa7)

Upon doing some digging, it looks like com.cloudbees.jenkins.plugins.amazonecs.pipeline.ECSDeclarativeAgent does not have a property for executionRole but com.cloudbees.jenkins.plugins.amazonecs.ECSTaskTemplate does. I believe this is leading to the execution role not being passed in the RegisterTaskDefinition call.

[pgarbe]

That's a good point. The executionRole is not (yet) supported with the declarative syntax.

Also, during merge the executionRole gets lost when you inherit from a pre-defined configuration.