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Artifact Path Placeholders

Note

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

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

with Workflow(
    generate_name="artifact-path-placeholders-",
    entrypoint="head-lines",
    arguments=[Parameter(name="lines-count", value=3), RawArtifact(name="text", data="1\n2\n3\n4\n5\n")],
) as w:
    Container(
        name="head-lines",
        image="busybox",
        command=[
            "sh",
            "-c",
            'mkdir -p "$(dirname "{{outputs.artifacts.text.path}}")" '
            '"$(dirname "{{outputs.parameters.actual-lines-count.path}}")" ; '
            'head -n {{inputs.parameters.lines-count}} < "{{inputs.artifacts.text.path}}" '
            '| tee "{{outputs.artifacts.text.path}}" | wc -l > "{{outputs.parameters.actual-lines-count.path}}"',
        ],
        inputs=[
            Parameter(name="lines-count"),
            Artifact(name="text", path="/inputs/text/data"),
        ],
        outputs=[
            Parameter(name="actual-lines-count", value_from=m.ValueFrom(path="/outputs/actual-lines-count/data")),
            Artifact(name="text", path="/outputs/text/data"),
        ],
    )

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apiVersion: argoproj.io/v1alpha1
kind: Workflow
metadata:
  generateName: artifact-path-placeholders-
spec:
  arguments:
    artifacts:
    - name: text
      raw:
        data: |
          1
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          4
          5
    parameters:
    - name: lines-count
      value: '3'
  entrypoint: head-lines
  templates:
  - container:
      command:
      - sh
      - -c
      - mkdir -p "$(dirname "{{outputs.artifacts.text.path}}")" "$(dirname "{{outputs.parameters.actual-lines-count.path}}")"
        ; head -n {{inputs.parameters.lines-count}} < "{{inputs.artifacts.text.path}}"
        | tee "{{outputs.artifacts.text.path}}" | wc -l > "{{outputs.parameters.actual-lines-count.path}}"
      image: busybox
    inputs:
      artifacts:
      - name: text
        path: /inputs/text/data
      parameters:
      - name: lines-count
    name: head-lines
    outputs:
      artifacts:
      - name: text
        path: /outputs/text/data
      parameters:
      - name: actual-lines-count
        valueFrom:
          path: /outputs/actual-lines-count/data

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