kustomize failes to merge yaml anchor

[nbraun-wolf]

Hi, am trying to merge a yaml anchor but kustomize is throwing errors. It works with kubectl apply.

Files that can reproduce the issue

deploy.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: anchor-test
spec:
  selector:
    matchLabels:
      app: anchor-test
  template:
    metadata:
      labels:
        app: anchor-test
    spec:
containers:
- &foo
  name: foo
  image: traefik/whoami
  ports: [ containerPort: 80 ]
  command: [sleep, infinity]
- <<: *foo
  name: bar

kustomization.yaml

resources:
  - "deploy.yaml"

Expected output

apiVersion: apps/v1
kind: Deployment
metadata:
  name: anchor-test
spec:
  selector:
    matchLabels:
      app: anchor-test
  template:
    metadata:
      labels:
        app: anchor-test
    spec:
      containers:
        - command:
            - sleep
            - infinity
          image: traefik/whoami
          name: foo
          ports:
            - containerPort: 80
        - command:
            - sleep
            - infinity
          image: traefik/whoami
          name: bar
          ports:
            - containerPort: 80

Actual output

Error: map[string]interface {}{"apiVersion":"apps/v1", "containers":[]interface {}{map[string]interface {}{"command":[]interface {}{"sleep", "infinity"}, "image":"traefik/whoami", "name":"foo", "ports":[]interface {}{map[string]interface {}{"containerPort":80}}}, map[interface {}]interface {}{"command":[]interface {}{"sleep", "infinity"}, "image":"traefik/whoami", "name":"bar", "ports":[]interface {}{map[string]interface {}{"containerPort":80}}}}, "kind":"Deployment", "metadata":map[string]interface {}{"name":"anchor-test"}, "spec":map[string]interface {}{"selector":map[string]interface {}{"matchLabels":map[string]interface {}{"app":"anchor-test"}}, "template":map[string]interface {}{"metadata":map[string]interface {}{"labels":map[string]interface {}{"app":"anchor-test"}}, "spec":interface {}(nil)}}}: 
json: unsupported type: map[interface {}]interface {}

Kustomize version

$ kustomize version
{Version:unknown GitCommit:$Format:%H$ BuildDate:1970-01-01T00:00:00Z GoOs:linux GoArch:amd64}

Platform

WSL2 Ubuntu20.4

[k8s-ci-robot]

@nbraun-wolf: This issue is currently awaiting triage.

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[KnVerey]

Duplicate of #3675
/kind duplicate
/close

[k8s-ci-robot]

@KnVerey: The label(s) kind/duplicate cannot be applied, because the repository doesn't have them.

In response to this:

Duplicate of #3675
/kind duplicate
/close

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[k8s-ci-robot]

@KnVerey: Closing this issue.

In response to this:

Duplicate of #3675
/kind duplicate
/close

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.