CODEWITHSUNDEEP
kubernetes-helmargo-workflowsargoproj
Lakshitha
Lakshitha

Reputation: 1542

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.

Upvotes: -1

Views: 101

Answers (1)

OneCricketeer
OneCricketeer

Reputation: 192023

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

  1. Your task is not evaluated
  2. 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"

Upvotes: 1

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