pull-request.yaml

name: Pull Request
permissions: {}

on:
  pull_request:
    branches:
      - main
    types: ["opened", "reopened", "synchronize", "edited"]

jobs:
  check-multiple-chart-changes:
    name: Check Multiple Chart Changes
    runs-on: ubuntu-24.04
    permissions:
      contents: read
    outputs:
      changed: ${{ steps.list-changed.outputs.changed }}
      changed_list: ${{ steps.list-changed.outputs.changed_list }}
    steps:
      - name: Checkout Code
        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
        with:
          fetch-depth: 0
          persist-credentials: false

      - name: Set up Helm
        uses: azure/setup-helm@dda3372f752e03dde6b3237bc9431cdc2f7a02a2 # v5.0.0
        with:
          # renovate: github=helm/helm
          version: v4.1.4

      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
        with:
          python-version: "3.13"

      - name: Set up chart-testing
        uses: helm/chart-testing-action@6ec842c01de15ebb84c8627d2744a0c2f2755c9f # v2.8.0
        with:
          # renovate: github=helm/chart-testing
          version: v3.14.0

      - name: Run chart-testing (list-changed)
        id: list-changed
        run: |
          changed="$(ct list-changed --config .github/linters/ct.yaml)"
          if [[ -n "$changed" ]]; then
            echo "changed=true" >> "$GITHUB_OUTPUT"
            echo "changed_list=\"${changed//$'\n'/ }\"" >> "$GITHUB_OUTPUT"
          fi

      - name: check for multiple chart changes
        if: steps.list-changed.outputs.changed == 'true'
        run: |
          COUNT=$(echo "$CHANGED_LIST" | wc -w)
          if [ "$COUNT" -gt 1 ]; then
            echo "Error: ($COUNT) charts changed. Please create separate PRs for each chart." >&2
            exit 1
          fi
        env:
          CHANGED_LIST: ${{ steps.list-changed.outputs.changed_list }}

  check-title:
    name: Check Title
    needs: check-multiple-chart-changes
    if: needs.check-multiple-chart-changes.outputs.changed == 'true'
    runs-on: ubuntu-24.04
    permissions:
      contents: read
    steps:
      - name: Validate PR Title format
        run: |
          CHANGED_LIST="${CHANGED_LIST//\"/}"

          # Derive chart name from the changed path and validate it.
          if [[ "$CHANGED_LIST" == */* ]]; then
            CHART_NAME="${CHANGED_LIST##*/}"
          else
            echo "Error: Unexpected chart identifier '$CHANGED_LIST'. Expected a path containing '/'." >&2
            exit 1
          fi

          if [[ -z "$CHART_NAME" ]]; then
            echo "Error: Derived chart name is empty. Original value: '$CHANGED_LIST'." >&2
            exit 1
          fi

          # Optional sanity check: ensure chart name contains only expected characters.
          if ! [[ "$CHART_NAME" =~ ^[a-zA-Z0-9._-]+$ ]]; then
            echo "Error: Derived chart name '$CHART_NAME' contains unexpected characters." >&2
            exit 1
          fi

          if [[ "$PR_TITLE" != "[${CHART_NAME}] "* ]]; then
            echo "PR title must start with '[${CHART_NAME}] '." >&2
            exit 1
          fi
        env:
          CHANGED_LIST: ${{ needs.check-multiple-chart-changes.outputs.changed_list }}
          PR_TITLE: ${{ github.event.pull_request.title }}