Add parameter to set kube version for Helm charts rendering

[dverbeir]

Fixes issue #543

Proposed Changes

Some charts generate manifests slightly differently depending on the target Kubernetes version (e.g. targeting different APIs). In order to obtain the appropriate rendered manifests, the Kubernetes version can be set using the kapitan kube_version parameter:

parameters:
  kapitan:
    kube_version: 1.16

• target_obj is provided to the Helm "compiler" which extracts the kube_version parameter and passes it to the go libtemplate to be set when rendering the chart.

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[ramaro]

Hey @dverbeir thanks for this! I think we could make it more standard with the rest of the helm options if implementing kube_version instead as a parameter for the helm compile item, e.g.

parameters:
   compile:
      - input_type: helm
        output_path: .
        input_paths:
          - charts/prometheus
        kube_version: 1.16
        ....

That way we can still have a global value passed to it and have targets define their own e.g.:

parameters:
  my_kube_version: 1.20

  kapitan:
   compile:
      - input_type: helm
        output_path: .
        input_paths:
          - charts/prometheus
        kube_version: ${my_kube_version}
        ....

Also this means that target_obj wouldn't need to be passed into Helm(), as this value will be accessible via comp_obj.
What do you think?

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[dverbeir]

Also this means that target_obj wouldn't need to be passed into Helm(), as this value will be accessible via comp_obj.
What do you think?

Unfortunately, as input:compile_file() doesn't receive the comp_obj, this doesn't really simplify anything. But I agree that it looks more standard to have kube_version under the compile item. I pushed a revised changeset.

[dverbeir]

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[dverbeir]

@googlebot I signed it!

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[dverbeir]

@googlebot What a pain!

Could somebody check what's wrong with Google CLA? We set up a corporate CLA 4 days ago and it's still not active... Don't you want contributions???

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[uberspot]

@googlebot What a pain!

Could somebody check what's wrong with Google CLA? We set up a corporate CLA 4 days ago and it's still not active... Don't you want contributions???

Hmm, we don't have full control over it. Are you using the exact same email for your git commits as the one you used for the CLA? Afaik that's the main thing that has to match (?).

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[dverbeir]

@googlebot What a pain!
Could somebody check what's wrong with Google CLA? We set up a corporate CLA 4 days ago and it's still not active... Don't you want contributions???

Hmm, we don't have full control over it. Are you using the exact same email for your git commits as the one you used for the CLA? Afaik that's the main thing that has to match (?).

I understand it's not under you control, of course. Sorry for letting my frustration out...
I was just hoping you could help accelerate this.

Exact same email is used. Problem is likely with corporate CLA itself. We contacted cla-submissions@google.com but no response so far...

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[ramaro]

Looking good! Just the small nit and we can merge. Don't worry about the CLA issue as you signed it, sometimes the bot is flaky and we can still merge.

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[ademariag]

@dverbeir as a side effect of moving the repository to kapicorp, the CLA problem should go away :)