helm-template.yml

name: Helm Template

on:
  workflow_call:
    inputs:
      path:
        description: 'Path to the Helm chart directory'
        required: true
        type: string
      values:
        description: 'Inline values YAML passed as -f (written to a temp file)'
        required: false
        default: ''
        type: string
      set:
        description: 'Additional --set overrides. Format: "key=value" per line.'
        required: false
        default: ''
        type: string
      release_name:
        description: 'Helm release name used during templating'
        required: false
        default: 'release'
        type: string
      namespace:
        description: 'Kubernetes namespace used during templating'
        required: false
        default: 'default'
        type: string
      update_dependencies:
        description: 'Run helm dependency update before templating'
        required: false
        default: false
        type: boolean
      runner:
        description: 'Runner label'
        required: false
        default: 'self-hosted'
        type: string

jobs:
  helm-template:
    runs-on: ${{ inputs.runner }}
    defaults:
      run:
        working-directory: ${{ inputs.path }}
    steps:
      - name: Checkout
        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
        with:
          fetch-depth: 0

      - name: Install Helm
        uses: azure/setup-helm@9bc31f4ebc9c6b171d7bfbaa5d006ae7abdb4310 # v5.0.1

      - name: Update chart dependencies
        if: inputs.update_dependencies
        run: helm dependency update .

      - name: Helm template
        env:
          VALUES: ${{ inputs.values }}
          SET_OVERRIDES: ${{ inputs.set }}
        run: |
          ARGS=("${{ inputs.release_name }}" . --namespace "${{ inputs.namespace }}")

          if [ -n "${VALUES}" ]; then
            printf '%s' "${VALUES}" > /tmp/helm-values.yaml
            ARGS+=(-f /tmp/helm-values.yaml)
          fi

          if [ -n "${SET_OVERRIDES}" ]; then
            while IFS= read -r line; do
              [ -z "$line" ] && continue
              ARGS+=(--set "${line}")
            done < <(printf '%s\n' "${SET_OVERRIDES}")
          fi

          helm template "${ARGS[@]}"