loops-param-argument.yaml

# This example demonstrates a workflow accepting a list of items (as JSON string)
# as an input parameter, and using it for expanding a step into multiple steps.
apiVersion: argoproj.io/v1alpha1
kind: Workflow
metadata:
  generateName: loops-param-arg-
spec:
  entrypoint: loop-param-arg-example
  arguments:
    parameters:
    - name: os-list
      value: |
        [
          { "image": "debian", "tag": "9.1" },
          { "image": "debian", "tag": "8.9" },
          { "image": "alpine", "tag": "3.6" },
          { "image": "ubuntu", "tag": "17.10" }
        ]

  templates:
  - name: loop-param-arg-example
    inputs:
      parameters:
      - name: os-list
    steps:
    - - name: test-linux
        template: cat-os-release
        arguments:
          parameters:
          - name: image
            value: "{{item.image}}"
          - name: tag
            value: "{{item.tag}}"
        withParam: "{{inputs.parameters.os-list}}"

  - name: cat-os-release
    inputs:
      parameters:
      - name: image
      - name: tag
    container:
      image: "{{inputs.parameters.image}}:{{inputs.parameters.tag}}"
      command: [cat]
      args: [/etc/os-release]