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Script Annotations Artifact Passing

This example will reuse the outputs volume across script steps.

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from pathlib import Path
from typing import Annotated

from hera.workflows import (
    Artifact,
    ArtifactLoader,
    Parameter,
    Steps,
    Workflow,
    script,
)


@script(constructor="runner")
def output_artifact(
    a_number: Annotated[int, Parameter(name="a_number")],
) -> Annotated[int, Artifact(name="successor_out")]:
    return a_number + 1


@script(constructor="runner")
def use_artifact(
    successor_in: Annotated[
        int,
        Artifact(name="successor_in", path="/my-path", loader=ArtifactLoader.json),
    ],
):
    print(successor_in)
    print(Path("/my-path").read_text())  # if you still need the actual path, it is still mounted where you specify


with Workflow(
    generate_name="annotations-artifact-passing",
    entrypoint="my-steps",
) as w:
    with Steps(name="my-steps") as s:
        out = output_artifact(arguments={"a_number": 3})
        use_artifact(arguments=[out.get_artifact("successor_out").with_name("successor_in")])

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apiVersion: argoproj.io/v1alpha1
kind: Workflow
metadata:
  generateName: annotations-artifact-passing
spec:
  entrypoint: my-steps
  templates:
  - name: my-steps
    steps:
    - - name: output-artifact
        template: output-artifact
        arguments:
          parameters:
          - name: a_number
            value: '3'
    - - name: use-artifact
        template: use-artifact
        arguments:
          artifacts:
          - name: successor_in
            from: '{{steps.output-artifact.outputs.artifacts.successor_out}}'
  - name: output-artifact
    inputs:
      parameters:
      - name: a_number
    outputs:
      artifacts:
      - name: successor_out
        path: /tmp/hera-outputs/artifacts/successor_out
    script:
      image: python:3.9
      source: '{{inputs.parameters}}'
      args:
      - -m
      - hera.workflows.runner
      - -e
      - examples.workflows.scripts.script_annotations_artifact_passing:output_artifact
      command:
      - python
      env:
      - name: hera__outputs_directory
        value: /tmp/hera-outputs
  - name: use-artifact
    inputs:
      artifacts:
      - name: successor_in
        path: /my-path
    script:
      image: python:3.9
      source: '{{inputs.parameters}}'
      args:
      - -m
      - hera.workflows.runner
      - -e
      - examples.workflows.scripts.script_annotations_artifact_passing:use_artifact
      command:
      - python

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