apiVersion: argoproj.io/v1alpha1
kind: Workflow
metadata:
  generateName: dag-conditional-artifacts-
  labels:
    workflows.argoproj.io/test: "true"
  annotations:
    workflows.argoproj.io/description: |
      Conditional artifacts provides a way to choose the output artifacts based on an expression.

      In this example the DAG template has two tasks which will run conditionall using `when`.

      Based on the condition one of steps may not execute. The step template output's artifact will be set to the
      executed step's output artifacts.
    workflows.argoproj.io/version: '>= 3.1.0'
spec:
  entrypoint: main
  templates:
    - name: main
      dag:
        tasks:
          - name: flip-coin
            template: flip-coin
          - name: heads
            depends: flip-coin
            template: heads
            when: "{{tasks.flip-coin.outputs.result}} == heads"
          - name: tails
            depends: flip-coin
            template: tails
            when: "{{tasks.flip-coin.outputs.result}} == tails"
      outputs:
        artifacts:
          - name: result
            fromExpression: "tasks['flip-coin'].outputs.result == 'heads' ? tasks.heads.outputs.artifacts.result : tasks.tails.outputs.artifacts.result"

    - name: flip-coin
      script:
        image: python:alpine3.6
        command: [ python ]
        source: |
          import random
          print("heads" if random.randint(0,1) == 0 else "tails")

    - name: heads
      script:
        image: python:alpine3.6
        command: [ python ]
        source: |
          with open("result.txt", "w") as f:
            f.write("it was heads")
      outputs:
        artifacts:
          - name: result
            path: /result.txt

    - name: tails
      script:
        image: python:alpine3.6
        command: [ python ]
        source: |
          with open("result.txt", "w") as f:
            f.write("it was tails")
      outputs:
        artifacts:
          - name: result
            path: /result.txt