name: Validate Helm Charts
on:
  pull_request:

jobs:
  detect-changed-charts:
    name: Detect changed charts
    runs-on: ubuntu-latest
    outputs:
      charts: ${{ steps.detect.outputs.charts }}
      any-chart-changed: ${{ steps.detect.outputs.any-chart-changed }}
      scan-charts: ${{ steps.detect.outputs.scan-charts }}
      any-scan: ${{ steps.detect.outputs.any-scan }}
      install-charts: ${{ steps.detect.outputs.install-charts }}
      any-install: ${{ steps.detect.outputs.any-install }}
    steps:
      - name: "Checkout Repository"
        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
        with:
          fetch-depth: 0
      - name: "Detect changed charts"
        id: detect
        run: |
          CHANGED_FILES=$(git diff --name-only "origin/${{ github.base_ref }}...HEAD")
          CHARTS="[]"
          CHANGED_DIRS=$(echo "$CHANGED_FILES" | cut -d/ -f1 | sort -u)
          for DIR in $CHANGED_DIRS; do
            if [ -f "$DIR/Chart.yaml" ]; then
              CHARTS=$(echo "$CHARTS" | jq -c --arg dir "$DIR" '. + [$dir]')
            fi
          done
          echo "charts=$CHARTS" >> "$GITHUB_OUTPUT"
          if [ "$CHARTS" = "[]" ]; then
            echo "any-chart-changed=false" >> "$GITHUB_OUTPUT"
            echo "No chart directories changed - nothing to build."
          else
            echo "any-chart-changed=true" >> "$GITHUB_OUTPUT"
            echo "Changed charts: $CHARTS"
          fi

          # The Trivy scan normally follows the changed charts. But a PR that
          # changes the scanner itself touches no chart at all, and would leave
          # the change untested. In that case scan a fixed sample instead, one
          # chart per interesting case: a documented deviation (samba), a fully
          # hardened one (cyberchef), and one with two workloads
          # (matrix-synapse).
          SCAN_CHARTS="$CHARTS"
          if [ "$CHARTS" = "[]" ] && echo "$CHANGED_FILES" | grep -qE '^(ci/(run-trivy-config\.sh|trivy/)|\.github/workflows/validate-charts\.yml)'; then
            SCAN_CHARTS='["samba","cyberchef","matrix-synapse"]'
            echo "Scanner changed without a chart change - scanning the sample: $SCAN_CHARTS"
          fi
          echo "scan-charts=$SCAN_CHARTS" >> "$GITHUB_OUTPUT"
          if [ "$SCAN_CHARTS" = "[]" ]; then
            echo "any-scan=false" >> "$GITHUB_OUTPUT"
          else
            echo "any-scan=true" >> "$GITHUB_OUTPUT"
          fi

          # --- The install-test matrix: changed charts minus the excluded ones
          # (issue #231). A chart in ci/excluded-charts.txt used to get a job
          # that ran the script, printed SKIP and exited 0 - and GitHub knows
          # only the exit code, so the check list showed a green tick for a
          # chart nothing was ever attempted on. Dropping it here means no job
          # exists for it and nothing claims it passed.
          #
          # The list is NOT parsed here. ci/run-install-test.sh --list-excluded
          # emits "<chart><TAB><reason>", and that script is the one parser;
          # re-implementing the format in YAML would be a second chance to
          # select different charts, silently. The comparison below is jq's
          # "!=" on whole strings, so a chart name is never read as a pattern.
          INSTALL_CHARTS="$CHARTS"
          SUMMARY_ROWS=""
          while IFS=$'\t' read -r EX_NAME EX_REASON; do
            [ -n "$EX_NAME" ] || continue
            if [ "$(echo "$INSTALL_CHARTS" | jq -r --arg c "$EX_NAME" 'index($c) != null')" = "true" ]; then
              # A "|" in the justification would break out of the table cell.
              SUMMARY_ROWS="${SUMMARY_ROWS}| \`$EX_NAME\` | ${EX_REASON//|/\\|} |"$'\n'
              echo "Excluded from the install-test: $EX_NAME - $EX_REASON"
            fi
            INSTALL_CHARTS="$(echo "$INSTALL_CHARTS" | jq -c --arg c "$EX_NAME" 'map(select(. != $c))')"
          done <<< "$(ci/run-install-test.sh --list-excluded)"
          echo "install-charts=$INSTALL_CHARTS" >> "$GITHUB_OUTPUT"
          if [ "$INSTALL_CHARTS" = "[]" ]; then
            echo "any-install=false" >> "$GITHUB_OUTPUT"
          else
            echo "any-install=true" >> "$GITHUB_OUTPUT"
          fi

          # An absent job says "not run" but never why, and an absence is easy
          # to miss entirely. So every excluded chart of this PR is named here
          # WITH its documented justification - which is the question a review
          # actually asks. This summary is the visible half of the change; the
          # dropped matrix entry is only the half that stops the lie.
          if [ -n "$SUMMARY_ROWS" ]; then
            {
              echo "### Charts excluded from the install-test"
              echo
              echo "These charts are changed by this PR but listed in \`ci/excluded-charts.txt\`, so they get **no** install-test job. There is no green tick for them, because nothing was attempted (issue #231)."
              echo
              echo "| Chart | Documented reason |"
              echo "| --- | --- |"
              printf '%s' "$SUMMARY_ROWS"
              echo
            } >> "$GITHUB_STEP_SUMMARY"
          fi
          echo "Install-test matrix: $INSTALL_CHARTS"

  build-chart:
    name: "Build ${{ matrix.chart }}"
    needs: detect-changed-charts
    if: needs.detect-changed-charts.outputs.any-chart-changed == 'true'
    runs-on: ubuntu-latest
    strategy:
      fail-fast: false
      matrix:
        chart: ${{ fromJSON(needs.detect-changed-charts.outputs.charts) }}
    steps:
      - name: "Checkout Repository"
        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
        with:
          fetch-depth: 0
      - name: "Install Helm"
        uses: azure/setup-helm@9bc31f4ebc9c6b171d7bfbaa5d006ae7abdb4310 # v5
      # Both steps below refuse to run while a chart declares a dependency that
      # is not in its charts/ directory - lint with "[WARNING] chart directory
      # is missing these dependencies", package with "found in Chart.yaml, but
      # missing in charts/ directory", both exiting 1. Charts without a
      # dependencies: block are skipped without a word, so this costs nothing
      # for the rest of the repo. See ci/helm-dependencies.sh for why it is
      # "update" and not "build".
      - name: "Fetch chart dependencies"
        run: ci/helm-dependencies.sh "${{ matrix.chart }}"
      - name: "Lint Helm Chart"
        run: helm lint --strict "${{ matrix.chart }}"
      - name: "Package Helm Chart"
        run: helm package "${{ matrix.chart }}"
      - name: "Check Chart Version was bumped"
        # template-chart is a scaffold and never published, its version is meaningless
        if: matrix.chart != 'template-chart'
        run: |
          BASE_VERSION=$(git show "origin/${{ github.base_ref }}:${{ matrix.chart }}/Chart.yaml" 2>/dev/null | grep '^version:' | awk '{print $2}' || true)
          NEW_VERSION=$(grep '^version:' "${{ matrix.chart }}/Chart.yaml" | awk '{print $2}')
          if [ -z "$BASE_VERSION" ]; then
            echo "New chart (does not exist on ${{ github.base_ref }}), version: $NEW_VERSION"
          elif [ "$BASE_VERSION" = "$NEW_VERSION" ]; then
            echo "::error file=${{ matrix.chart }}/Chart.yaml::Chart '${{ matrix.chart }}' was modified but its version was not bumped (still $BASE_VERSION). Bump 'version:' in Chart.yaml, otherwise the publish on main will collide with the already published version."
            exit 1
          else
            echo "Version bump OK: $BASE_VERSION -> $NEW_VERSION"
          fi

  quantity-render:
    name: "Resource quantities"
    runs-on: ubuntu-latest
    # The one job in this workflow that deliberately ignores the changed-chart
    # matrix and runs over *every* chart (issue #157). The bug it guards
    # against - resource quantities formatted with printf "%v", where float64
    # flips to exponential notation above ~1e6 - lives in the resources helper,
    # and that helper is copied into every chart's templates/_helpers.tpl,
    # because sharing it would mean a library chart (README, guideline 14). So
    # it comes back by copy: a new chart started from an older one, or from
    # template-chart before the fix.
    # In that PR the chart is new and its copy of the bug is in no diff anyone
    # reads. Running over everything also means there is no list to maintain -
    # adding a chart enrolls it. Two renders per chart, no cluster, a few
    # seconds in total; it depends on no other job and finishes long before
    # build-chart, so it adds no wall-clock time to the pipeline.
    steps:
      - name: "Checkout Repository"
        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
      - name: "Install Helm"
        uses: azure/setup-helm@9bc31f4ebc9c6b171d7bfbaa5d006ae7abdb4310 # v5
      - name: "Render every chart with bare integer quantities"
        run: ci/run-quantity-render-test.sh

  trivy-config:
    name: "Trivy config ${{ matrix.chart }}"
    needs: detect-changed-charts
    if: needs.detect-changed-charts.outputs.any-scan == 'true'
    runs-on: ubuntu-latest
    # Reporting only (issue #84): the scan renders each changed chart and lists
    # what `trivy config` finds, but it never fails the job - see
    # TRIVY_CONFIG_MODE below. Deliberately not a gate yet: the repo has several
    # documented deviations, and a check that goes red on those every time is one
    # people learn to scroll past. Depends only on detect-changed-charts, so it
    # runs beside build-chart and adds no wall-clock time to the pipeline.
    strategy:
      fail-fast: false
      matrix:
        chart: ${{ fromJSON(needs.detect-changed-charts.outputs.scan-charts) }}
    env:
      # renovate: datasource=github-releases depName=aquasecurity/trivy
      TRIVY_VERSION: v0.74.0
      # "report" always exits 0. Switch to "gate" to make a finding that no
      # documented exception covers fail the job - the intended step once the
      # seccomp gap (#84) is closed.
      TRIVY_CONFIG_MODE: report
    steps:
      - name: "Checkout Repository"
        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
      - name: "Install Helm"
        uses: azure/setup-helm@9bc31f4ebc9c6b171d7bfbaa5d006ae7abdb4310 # v5
      # A plain release download rather than aquasecurity/setup-trivy, and the
      # reason is measured on the Gitea probe PR of #225, not assumed. That
      # action runs actions/checkout against aquasecurity/trivy on github.com
      # and hands it `github.token` - which on Gitea is a GITEA token.
      # github.com answers 401, checkout retries twice and the job ends on
      # "fatal: could not read Username for 'https://github.com': terminal
      # prompts disabled", an error naming neither the action nor the token.
      # Its actions/cache step is inert on the instance as well ("Cache action
      # is only supported on GHES version >= 3.5"), and fetching the nested
      # actions cost 4m30s before the job even started. One tarball behaves
      # identically on both forges, and the `# renovate:` comment above still
      # keeps TRIVY_VERSION current - verified by dry run: pinned to v0.72.0
      # the lookup offers v0.74.0 as a minor update.
      - name: "Install Trivy"
        run: |
          curl -sSfL -o /tmp/trivy.tar.gz \
            "https://github.com/aquasecurity/trivy/releases/download/${TRIVY_VERSION}/trivy_${TRIVY_VERSION#v}_Linux-64bit.tar.gz"
          mkdir -p "$HOME/.local/bin"
          tar -xzf /tmp/trivy.tar.gz -C "$HOME/.local/bin" trivy
          echo "$HOME/.local/bin" >> "$GITHUB_PATH"
          "$HOME/.local/bin/trivy" --version
      # Findings land in the job summary, not only in the log: exceptions with
      # their reasons come from ci/trivy/trivyignore.yaml, the trusted-registry
      # list from ci/trivy/data/ksv0125.yaml.
      - name: "Scan rendered manifests"
        run: ci/run-trivy-config.sh "${{ matrix.chart }}"

  install-test:
    name: "Install-test"
    needs: [detect-changed-charts, build-chart]
    if: needs.detect-changed-charts.outputs.any-install == 'true'
    # The job itself lives in .github/workflows/install-test.yml and is called
    # from here and from install-test-all-charts.yml (Gitea #52). Everything
    # that decides HOW a chart is installed moved there unchanged - the runner
    # label expression, the pinned kubectl with its skew check, envsubst, the
    # containerised-job detection, the per-leg cluster name, the freesailarr VPN
    # credentials. What stayed here is WHICH charts are tested and whether the
    # job runs at all. A copied job would be a second chance to test
    # differently, unnoticed, which is the same argument that gives
    # ci/excluded-charts.txt exactly one parser.
    #
    # "install-charts", not "charts": the changed charts minus the ones in
    # ci/excluded-charts.txt, filtered in detect-changed-charts, which also
    # names every excluded chart of this pull request with its documented
    # reason in its job summary (issue #231). The called workflow's matrix
    # comment carries the rest of that lesson, including why the decision
    # cannot be made per matrix leg instead.
    uses: ./.github/workflows/install-test.yml
    with:
      charts: ${{ needs.detect-changed-charts.outputs.install-charts }}
    # As the 24 publish-<chart>.yml hulls do, and measured to work on this
    # instance (README, "Where this repo lives"). The called workflow declares
    # exactly one secret, OP_CONNECT_TOKEN, and only its freesailarr leg reads
    # it.
    secrets: inherit