resource_builder_example.go

package main

import (
	"fmt"
	"os"

	"github.com/spf13/pflag"

	"k8s.io/apimachinery/pkg/api/meta"
	"k8s.io/cli-runtime/pkg/genericclioptions"
	"k8s.io/cli-runtime/pkg/resource"
)

func main() {
	// add flags for server connection (--kubeconfig, --server, etc)
	config := genericclioptions.NewConfigFlags(true)
	config.AddFlags(pflag.CommandLine)

	// add flags for resource building (-f, --filename, etc)
	builderFlags := genericclioptions.NewResourceBuilderFlags().WithFile(false)
	builderFlags.AddFlags(pflag.CommandLine)

	// Parse flags
	if err := pflag.CommandLine.Parse(os.Args); err != nil {
		return
	}

	// Visit results
	if err := builderFlags.ToBuilder(config, nil).Do().Visit(func(info *resource.Info, err error) error {
		if err != nil {
			fmt.Println(err, "\n===")
			return nil
		}
		name, _ := meta.NewAccessor().Name(info.Object)
		fmt.Printf("scope:    %s\nresource: %v\nkind:     %v\nname:     %s\n===\n", info.Mapping.Scope.Name(), info.Mapping.Resource, info.Mapping.GroupVersionKind, name)
		return nil
	}); err != nil {
		fmt.Println(err)
		os.Exit(1)
	}
}

go run resource_builder_example.go --kubeconfig=/path/to/kubeconfig --filename=/path/to/manifest.yaml