I’m trying to run a ‘fire and forget’ ECS Fargate task. The task starts a docker container which runs some database migrations and exits. I’m attempting to do something like:

taskDefinition.run({cluster})

However, when I run

pulumi up

I get:

error: Error: Cannot call '.get' during update or preview.
    To manipulate the value of this Output, use '.apply' instead.
        at Proxy.get (.../node_modules/@pulumi/pulumi/output.js:173:15)
        at FargateTaskDefinition.run (.../node_modules/@pulumi/ecs/taskDefinition.ts:229:39)

Any ideas? I think I need to wrap this is an async function somehow, but some guidance would be appreciated. The sample code shows this working in response to an API gateway handler, but I’d like it to execute when the pulumi program runs.

pulumi up

runs

preview

before confirmation which is why the error is occurring. going to guess taskdefinition is of type

Output

try using

apply

- https://www.pulumi.com/docs/intro/concepts/inputs-outputs/

yeah, that’s what I expected too. But the type of taskDefinition is

awsx.ecs.FargateTaskDefinition

. Somehow I need to create a new

Output

that defers the execution of the

taskDefinition.run