Output Parameter

Note

This example is a replication of an Argo Workflow example in Hera. The upstream example can be found here.

HeraYAML

from hera.workflows import (
    Container,
    Parameter,
    Steps,
    Workflow,
    models as m,
)

with Workflow(generate_name="output-parameter-", entrypoint="output-parameter") as w:
    whalesay = Container(
        name="whalesay",
        image="docker/whalesay:latest",
        command=["sh", "-c"],
        args=["sleep 1; echo -n hello world > /tmp/hello_world.txt"],
        outputs=Parameter(
            name="hello-param",
            value_from=m.ValueFrom(
                default="Foobar",
                path="/tmp/hello_world.txt",
            ),
        ),
    )
    print_message = Container(
        name="print-message",
        image="docker/whalesay:latest",
        command=["cowsay"],
        args=["{{inputs.parameters.message}}"],
        inputs=Parameter(name="message"),
    )
    with Steps(name="output-parameter"):
        g = whalesay(name="generate-parameter")
        print_message(
            name="consume-parameter",
            arguments={"message": "{{steps.generate-parameter.outputs.parameters.hello-param}}"},
        )

apiVersion: argoproj.io/v1alpha1
kind: Workflow
metadata:
  generateName: output-parameter-
spec:
  entrypoint: output-parameter
  templates:
  - container:
      args:
      - sleep 1; echo -n hello world > /tmp/hello_world.txt
      command:
      - sh
      - -c
      image: docker/whalesay:latest
    name: whalesay
    outputs:
      parameters:
      - name: hello-param
        valueFrom:
          default: Foobar
          path: /tmp/hello_world.txt
  - container:
      args:
      - '{{inputs.parameters.message}}'
      command:
      - cowsay
      image: docker/whalesay:latest
    inputs:
      parameters:
      - name: message
    name: print-message
  - name: output-parameter
    steps:
    - - name: generate-parameter
        template: whalesay
    - - arguments:
          parameters:
          - name: message
            value: '{{steps.generate-parameter.outputs.parameters.hello-param}}'
        name: consume-parameter
        template: print-message

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