Tilt: Feature: .env File Support

[david-martyn-ford]

It'd be great to use this pattern for setting application specific environment variables with the project. I have used it previously with docker-compose and NodeJS.

https://docs.docker.com/compose/env-file/
https://github.com/motdotla/dotenv#readme

[nicks]

Fwiw, I'm surprised this doesn't work out of the box, since it's supposed to be built in to docker compose?

[david-martyn-ford]

I'd imagine it would work if I was to use docker-compose, but I'm actually talking about using a .env file to populate values within the Tiltfile.

.env

AWS_ACCESS_KEY_ID=Test
AWS_SECRET_ACCESS_KEY=Test

Titlefile

docker_build('service1', './cmd/service1')

yaml = helm(
  './deployment/helm-charts/service',
  name='name',
  namespace='namespace',
  values=['./deployment/helm-charts/service/values.yaml'],
  set=[
    'service1.image=service1',

    'aws.accessKey=' + os.environ['AWS_ACCESS_KEY_ID'],
    'aws.secretKey=' + os.environ['AWS_SECRET_ACCESS_KEY'],
  ],
)

k8s_yaml(yaml)

[nicks]

ah! ok, that makes sense.

you can do this now with local(), with something like:

aws_access_key_id = str(local('source .env && echo $AWS_ACCESS_KEY_ID')).strip()

though we're working on better primitives for this. does that work?

[landism]

We've also been suggesting read_json() for this, e.g.

cfg = read_json('config.json')
yaml = helm(
  './deployment/helm-charts/service',
  name='name',
  namespace='namespace',
  values=['./deployment/helm-charts/service/values.yaml'],
  set=[
    'service1.image=service1',

    'aws.accessKey=' + cfg['AWS_ACCESS_KEY_ID'],
    'aws.secretKey=' + cfg['AWS_SECRET_ACCESS_KEY'],
  ],
)