Is it possible to achieve such a refactor in YAML - yaml

Question

I'm working on a concourse pipeline and I need to duplicate a lot of code in my YAML so I'm trying to refactor it so it is easily maintainable and I don't end up with thousands of duplicates lines/blocks.
I have achieve the following yaml file after what seems to be the way to go but it doesn't fullfill all my needs.
add-rotm-points: &add-rotm-points
task: add-rotm-points
config:
platform: linux
image_resource:
type: docker-image
source:
repository: ((registre))/polygone/concourse/cf-cli-python3
tag: 0.0.1
insecure_registries: [ ((registre)) ]
run:
path: source-pipeline/commun/rotm/trigger-rotm.sh
args: [ "source-pipeline", "source-code-x" ]
inputs:
- name: source-pipeline
- name: source-code-x
jobs:
- name: test-a
plan:
- in_parallel:
- get: source-pipeline
- get: source-code-a
trigger: true
- <<: *add-rotm-points
- name: test-b
plan:
- in_parallel:
- get: source-pipeline
- get: source-code-b
trigger: true
- <<: *add-rotm-points
My problem is that both my jobs uses the generic task defined at the top. But in the generic task I need to change source-code-x to the -a or -b version I use in my jobs.
I cannot find a way to achieve this without duplicating my anchor in every jobs and that seems to be counter productive. But i may not have full understood yaml anchors/merges.

Answer 1

All you need to do is map inputs on individual tasks, like this:
add-rotm-points: &add-rotm-points
task: add-rotm-points
config:
platform: linux
image_resource:
type: docker-image
source:
repository: ((registre))/polygone/concourse/cf-cli-python3
tag: 0.0.1
insecure_registries: [ ((registre)) ]
run:
path: source-pipeline/commun/rotm/trigger-rotm.sh
args: [ "source-pipeline", "source-code-x" ]
inputs:
- name: source-pipeline
- name: source-code-x
jobs:
- name: test-a
plan:
- in_parallel:
- get: source-pipeline
- get: source-code-a
trigger: true
- <<: *add-rotm-points
input_mapping:
source-code-x: source-code-a
- name: test-b
plan:
- in_parallel:
- get: source-pipeline
- get: source-code-b
trigger: true
- <<: *add-rotm-points
input_mapping:
source-code-x: source-code-b
See Example Three in this blog: https://blog.concourse-ci.org/introduction-to-task-inputs-and-outputs/