How to emit result in Tekton with python script?

Question

I my Tekton pipeline I want to emit a result so that $(results.myresult) can be used in the next pipeline task. The code looks like this:

apiVersion: tekton.dev/v1beta1
kind: Task
  name: foo
  namespace: bar
...
spec:
  results:
    - name: myresult
  script: |
    #!/usr/bin/env bash 
    # do some meaningful stuff here before emitting the result
    myvar="foobar"
    printf $(params.myvar) | tee $(results.myresult)

However, I want to use python instead of a bash script. How can I emit the result variable?
I guess I’d have to use something like this in python:

var myvar = "foobar"
sys.stdout.write(myvar)

But how can I write this into $(results.myresult) and mimic the combination of pipe and tee from Linux in python?

Asked By: BugsBuggy

||

Source

Answer 1

First thing I would look at …. your sys.stdout.write kind of suggests you are writing stuff … to stdout. While you mean to write this to your RESULTS ($(results.myresult)).

Answered By: SYN

Answer 2

I found a working solution! This is how a working example would look like using python:

script: |
  #!/usr/bin/python3
  import subprocess
  with open('$(results.myresult.path)', 'w') as f:
      result = subprocess.run(['printf', 'This is a test!'], stdout=f)
  print(result.stdout)

Answered By: BugsBuggy

How to emit result in Tekton with python script?

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