[SOLVED] How to control Argo(helm) flow with Script output

How to control Argo(helm) flow with Script output

I have a script defined in Argo WorkflowTemplate as follows. This may either print status:true or status:false (I have simplified this)

- name:util-script
    script:
      image: python3
      command: ["python3"]
      script |
         print(status:true)

Is there a way to control dag flow based on the above script output? I know helm provides flow control like Helm Doc - Flow control

Following is what I tried so far, but this always jumps to else condition. anything Im doing wrong? Appreciate any input on this

{{- if contains "status:true" `tasks.util-script.outputs.result` }}
  # even result is `status:true`, does not reach here
{{ else }}
  # always reach here
{{ end }}

I have verified tasks.util-script.outputs.result indeed returns the expected result.

Solution

Helm executes before the workflow runs. That's why you'd end up in the else block.

Your task is not evaluated
When template is rendered,
```
`tasks.util-script.outputs.result`
```
creates a literal string, which doesn't contain status text

You need to use a when conditional, as shown in the documentation - https://argo-workflows.readthedocs.io/en/stable/walk-through/conditionals/

- name: next
  template: next
  when: {{`{{tasks.util-script.outputs.result}}`}} == "status:true"