kubernetes-field-selector-extractor

README

Kubernetes Field Selector Extractor

This application extracts all the available Field Selectors from Kubernetes. Since the list of implemented field selectors is neither exposed via any APIs nor declared anywhere, this application statically finds every call for AddFieldLabelConversionFunc like shown below and looks for hard-coded labels by retrieving ASTs.

err = scheme.AddFieldLabelConversionFunc(SchemeGroupVersion.WithKind("Node"),
    func(label, value string) (string, string, error) {
        switch label {
        case "metadata.name":
            return label, value, nil
        case "spec.unschedulable":
            return label, value, nil
        default:
            return "", "", fmt.Errorf("field label not supported: %s", label)
        }
    },
)

Cited from: pkgs/apis/core/v1/conversion.go (kubernetes/kubernetes)

Set up

$ git clone https://github.com/chitoku-k/kubernetes-field-selector-extractor
$ cd kubernetes-field-selector-extractor
$ git submodule update --init
$ go build -o kubernetes-field-selector-extractor

Usage

$ ./kubernetes-field-selector-extractor ./kubernetes/pkg/apis > selectors.json

Known Limitations

Unsupported style of coding such as the following cases emit warnings.

• Variable kinds are not supported (such as for loop)
  • pkg/apis/batch/v1/beta1/conversion.go (kubernetes/kubernetes)
• Variable labels are not supported (such as referencing map)
  • pkg/apis/events/v1/conversion.go (kubernetes/kubernetes)
  • pkg/apis/events/v1beta1/conversion.go (kubernetes/kubernetes)

License

Kubernetes is licensed under the Apache License, Version 2.0.