Ability to import different kcl files based on parameters

[irizzant]

What happened?

I'd like to specify a channel parameter that can be read in my Composition file, and decide what file to import basing on that parameter.
Something like:

apiVersion: krm.kcl.dev/v1alpha1
kind: KCLInput
metadata:
  annotations:
    "krm.kcl.dev/default_ready": "True"
  name: basic
spec:
  source: |
    import file

    if _option("params")?.oxr?.spec.parameters.channel:
       file.read(_option("params")?.oxr?.spec.parameters.channel + "/something.yaml"
    else:
       file.read("default/somethingElse.yaml")

but maybe it's not feasible.

How can we reproduce it?

What environment did it happen in?

Function version:

[Peefy]

cc @zong-zhe

[irizzant]

I think I actually found one way to implement something similar by looking at the code here.

That code generates an array of Compositions, in the example above they could be one for each value of the channel parameter.

Then the actual Composition selection happens using these labels and Composition Revision by specifying a compositionRevisionSelector.matchLabels in the Claim.

Also, I if I define 2 KCL files, let's say:

• first.k
• second.k

and I put this content into both:
test = "test"
Visual Studio Code KCL extension shows an error:

The variable 'test' is declared here(ImmutableError)
second.k(1, 1): Can not change the value of 'test', because it was declared immutable
test: str

This tricked me into believing that I was doing it the wrong way. In reality this is not an error at all if you make sure that only one of these files is selected at runtime.

That being said, I'd still like to know if there is a better way to accomplish this other than the one I showed above