[AdamMagued]

Problem

When converting Kustomize manifests (such as default Kubebuilder scaffolding) containing app.kubernetes.io/name in selector/matchLabels fields, helmify outputs both the original hardcoded label and the {{- include ".selectorLabels" . | nindent X }} helper call. Because the selectorLabels template helper already defines app.kubernetes.io/name: {{ include ".name" . }}, the rendered Helm chart templates contain duplicate app.kubernetes.io/name mapping keys. Strict YAML parsers (such as ArgoCD or Kubernetes server-side apply) reject these manifests with mapping key duplicate errors.

Root Cause

Resource processors (deployment, daemonset, service, and poddisruptionbudget) construct selectors by serializing the original resource selector map and appending {{- include ".selectorLabels" . }}. Unlike resource metadata labels in pkg/processor/meta.go which strips labels managed by Helm (app.kubernetes.io/name, etc.), the selector and pod template label generation retained app.kubernetes.io/name from the incoming manifest. Furthermore, when app.kubernetes.io/name is the only selector label, serializing an empty map could produce invalid YAML ({}).

Solution

1. In pkg/processor/deployment, pkg/processor/daemonset, pkg/processor/service, and pkg/processor/poddisruptionbudget:
   • Delete app.kubernetes.io/name from selector/matchLabels and pod template labels prior to serialization.
   • Gracefully handle cases where app.kubernetes.io/name was the sole selector label, ensuring the selector template helper is rendered cleanly without emitting empty inline dicts ({}).
2. Added unit regression tests in pkg/processor/service, pkg/processor/deployment, pkg/processor/daemonset, and pkg/processor/poddisruptionbudget covering duplicate label removal and single-label selectors.
3. Added end-to-end regression test in pkg/app verifying full Helm chart generation and strict Helm lint validation (helmLint.Strict = true) with 0 errors.

Fixes #196

[AdamMagued]

Closing in favor of earlier community PR #199 to keep the review queue clean.