kyaml: projected volume source sequence key

main.go

package main

import (
	"fmt"
	"os"

	"sigs.k8s.io/kustomize/kyaml/yaml"
)

func main() {
	r, err := yaml.Parse(myDeployment)
	if err != nil {
		fmt.Fprintf(os.Stderr, "Unable to parse.\n")
		os.Exit(1)
	}

	cmSource, err := r.Pipe(
		yaml.Lookup(
			"spec", "template", "spec", "volumes",
			"[name=configs]", "projected", "sources",
			"[configMap.name=cm1]", // Does not work.
		),
	)
	if err != nil {
		fmt.Fprintf(os.Stderr, "Unable to lookup.\n")
		os.Exit(1)
	}
	if cmSource == nil {
		fmt.Fprintf(os.Stderr, "Projected volume not found.\n")
		os.Exit(1)
	}

	fmt.Fprintf(os.Stdout, "%v\n", cmSource.Document().Value)
}

var myDeployment = `apiVersion: apps/v1
kind: Deployment
metadata:
  name: my-deployment
  namespace: example
spec:
  selector:
    matchLabels:
      app.kubernetes.io/instance: my-deployment
  template:
    metadata:
      labels:
        app.kubernetes.io/instance: my-deployment
    spec:
      containers:
        - name: example
          image: k8s.gcr.io/pause:3.1
      volumes:
        - name: configs
          projected:
            sources:
              - configMap:
                  name: cm1
                  optional: true
              - configMap:
                  name: cm2
                  optional: true
              - configMap:
                  name: secret1
                  optional: true
              - configMap:
                  name: secret2
                  optional: true
`