feat: support inline configurations

[TLDMain]

Relevant issue #1966

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[TLDMain]

Hi there, @stormqueen1990!

Thanks for your feedback!

This PR addresses the need to streamline kustomize configurations by allowing inlined configurations directly within the kustomization.yaml file, similar to how patches are currently handled. The use case here is to simplify the sharing and management of kustomize configurations by embedding them within a single file, eliminating the need for separate configuration files. This makes it easier to provide comprehensive and portable examples.

For instance, with this change, configurations can be inlined as follows:

apiVersion: kustomize.config.k8s.io/v1beta1
kind: Kustomization
resources:
  - helmrelease.yaml
configMapGenerator:
  - name: helmrelease-values
    files:
      - values.yaml=helmrelease.values.yaml
configurations:
  - |
    nameReference:
      - kind: ConfigMap
        version: v1
        fieldSpecs:
          - path: spec/valuesFrom/name
            kind: HelmRelease

This enhancement allows users to consolidate their configurations, making it more convenient to manage and share kustomize setups.

/remove-lifecycle stale /label tide/merge-method-squash

[stormqueen1990]

/triage under-consideration

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[stormqueen1990]

/remove-triage under-consideration /ok-to-test /unhold

[koba1t]

Hi @stormqueen1990

I suggest inlineConfigurations as the name. The type can still be a string slice, just like the current configurations field.

type Kustomization struct is our most important top-level configuration. I feel we need to write The Enhancement Proposal and discuss the interface If we try to introduce any changes to that structure. https://github.com/kubernetes-sigs/kustomize/blob/master/proposals/README.md

[TLDMain]

Hi there, @stormqueen1990!

Apologies for the incorrect analogy. I based these changes on the behavior of the transformers and generators fields, not on patches. Here's a similar PR: #3225. However, I can create a separate field if that's critical.

Also, the comments for these fields are similar to those in the configurations: https://github.com/kubernetes-sigs/kustomize/blob/77354d73b940e56e19b6e44f6c297b26f22d722f/api/types/kustomization.go#L171-L175

I'll wait for your decision.

[koba1t]

Hi @TLDMain

I think there is a many consideration point and need take a time that add new inlineConfigurations field for Kustomization struct. I believe that is a better to use current Configurations []string field in this case and add carefully path check in code avoid some bugs.

Please add more strict check for string in Configurations field.

[TLDMain]

Hi @koba1t.

I suggest two options for checking: either use regex to verify that the string contains a file path, or check if the string contains multiple lines.

Alternatively, you can propose your own method for checking.

[koba1t]

@TLDMain I am so sorry for the delayed response.

I have one suggestion. If the contents of the field are a single line, the method is to go looking for the file to which it refers.

regexp would be difficult because different operating systems interpret them in different ways. Perhaps in the future there may be content that can be expressed on a single line, so it would be safer to check if it can be resolved with the file open function.