Environment Variables at workflow level

[lucasbrasilino]

Hello! 👋

Is it possible to declare environment variables at the workflow level for them to be assigned on each template/pod of a workflow? For instance, in the following YAML file I'd like to set, say, USER_DIR and DB_DIR at workflow level therefore they will be set in the print-message template (image alpine:latest), while dump-env temp (image python:alpine3.6) will them plus DEFAULT_DIR and IMAGE_DIR since they are set at the template/pod level.

Thank you for any insight! 🙏

spec:
  entrypoint: python-script-example
  templates:
  - name: python-script-example
    steps:
    - - name: dump-env-step
        template: dump-env
    - - name: print-last-step
        template: print-message
        arguments:
          parameters:
          - name: message
            value: "{{steps.dump-env-step.outputs.result}}"

  - name: dump-env
    script:
      image: python:alpine3.6
      command: [python]
      env:
        - name: DEFAULT_DIR
          value: "/scratch/nfsdir"
        - name: IMAGE_DIR
          value: "/scratch/image"
      source: |
        import os
        for k,v in os.environ.items():
          print(f"{k}={v}")

  - name: print-message
    inputs:
      parameters:
      - name: message
    container:
      image: alpine:latest
      command: [sh, -c]
      args: ["echo result was: {{inputs.parameters.message}}"]

[jswxstw]

You can try podSpecPatch.

spec:
  entrypoint: python-script-example
  podSpecPatch: |
    containers:
    - name: main
      env:
      - name: DEFAULT_DIR
        value: "/scratch/nfsdir"
      - name: IMAGE_DIR
        value: "/scratch/image"
  templates:
  - name: python-script-example
    steps:
    - - name: dump-env-step
        template: dump-env
    - - name: print-last-step
        template: print-message
        arguments:
          parameters:
          - name: message
            value: "{{steps.dump-env-step.outputs.result}}"

  - name: dump-env
    script:
      image: python:alpine3.6
      command: [python]
      source: |
        import os
        for k,v in os.environ.items():
          print(f"{k}={v}")

  - name: print-message
    inputs:
      parameters:
      - name: message
    container:
      image: alpine:latest
      command: [sh, -c]
      args: ["echo result was: {{inputs.parameters.message}}"]