Confused by dotenv with variables

[waterworthd-cim]

I have a taskfile which I defined as below - there are two env files (.env.docker.prod and .env.docker.dev). In the dev version I have DOCKER_PLATFORM=linux/arm64 and in the prod it's linux/amd64).

vars:
  ENV: '{{.ENV | default "dev"}}'

dotenv:
  - 'docker/.env.docker.{{.ENV}}'

tasks:
  default:
    desc: test
    cmds:
      - echo {{.ENV}}
      - echo ${DOCKER_PLATFORM}

This doesn't work as expected, running task ENV=dev prints (as expected)

task: [default] echo dev
dev
task: [default] echo ${DOCKER_PLATFORM}
linux/arm64

But task ENV=prod prints

task: [default] echo prod
prod
task: [default] echo ${DOCKER_PLATFORM}
linux/arm64

So ENV is being set as expected, but dotenv seems to always source 'docker/.env.docker.dev'.

If I restructure the file so ENV is and argument of the specific task I get what I expect

dotenv:
  - 'docker/.env.docker.{{.ENV}}'

tasks:
  default:
    desc: test
    cmds:
      - echo {{.ENV}}
      - echo ${DOCKER_PLATFORM}
    vars:
      ENV: '{{.ENV | default "dev"}}'

Is this expected behaviour?

[trulede]

I believe that this a well known defect. I've written a PR for it #2288 ... which has thus far not received any attention.