Github reusable workflows: use parameterized "uses"

Question

I am trying to build my reusable workflow in such a way anyone in my team can hook up with it, pass the variable that it needs, and the workflow decides what to do according to input received. The problem I am having comes when within such workflow, I want to call another one by using a received input. To go into details, my workflow receives as input:

inputs:
  service:
    description: 'The name of the service'
    required: false
    type: string

within one of its job I am trying to do the following:

  call-next-workflow:
    name: Run Test 
    uses: "./.github/workflows/${{inputs.service}}.yml"

unfortunately github complains saying:

"./.github/workflows/${{inputs.service}}.yml" : failed to fetch workflow: workflow was not found.

Is there a way to use my parameter into the uses part, needed to call the next workflow?

Answer 1

The problem is that the uses path must be static and cannot be dynamic.

As a workaround, you could create a proxy workflow, which references each of the possible services.

on: workflow_call
inputs:
  service:
    required: true
    type: string

jobs:
  service_a:
    if: inputs.service == 'service A'
    uses: ".github/workflows/service_a.yaml@main"
  service_b:
    if: inputs.service == 'service B'
    uses: ".github/workflows/service_b.yaml@main"
  service_c:
    if: inputs.service == 'service C'
    uses: ".github/workflows/service_c.yaml@main"

I appreciate that this does not have the same level of flexibility as a dynamic uses path.