ci.yml

name: CI

on:
  push:
    branches: [main]
    # The release job lives in this workflow, and .ferrflow declares one
    # package at path ".", so any conventional commit here drives the CLI
    # version whatever files it touches. A docs-only merge must not be able
    # to publish a binary to crates.io and eight npm packages, none of which
    # can be withdrawn. A push touching anything outside docs/site still
    # matches and runs the full workflow, so a change that ships code and its
    # documentation together releases as normal.
    paths-ignore: ['docs/site/**']
  pull_request:
    branches: [main]
  workflow_dispatch:
    inputs:
      dry_run:
        description: 'Dry run'
        type: boolean
        default: false

concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: ${{ github.event_name == 'pull_request' }}

permissions:
  contents: read

jobs:
  test:
    name: Test
    if: github.event_name != 'push' || !startsWith(github.event.head_commit.message, 'chore(release):')
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
      - uses: dtolnay/rust-toolchain@6bed0761d98439e5a578e2877258200ad565ba87 # stable
        with:
          components: clippy, rustfmt
      - uses: Swatinem/rust-cache@6323deb102c322ba6fcbdcafc7e3dddab59af2b6 # v2
      - uses: taiki-e/install-action@67729d5c413db75907f0ad1e39bb04b9c868ff60 # v2
        with:
          tool: cargo-nextest
      - name: Format check
        run: cargo fmt --check
      - name: Clippy
        run: cargo clippy -- -D warnings
      # The wasm package builds the library with default-features off, a
      # configuration nothing else in CI compiles. Without this, a module
      # that reaches for a cli-gated dependency only fails at publish time.
      - name: Check the no-cli build surface
        run: cargo check -p ferrflow-wasm
      - name: Tests (nextest)
        run: cargo nextest run --no-fail-fast

  security:
    name: Cargo Security
    if: github.event_name != 'push' || !startsWith(github.event.head_commit.message, 'chore(release):')
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
        with:
          fetch-depth: 0
          persist-credentials: false
      - uses: dtolnay/rust-toolchain@6bed0761d98439e5a578e2877258200ad565ba87 # stable
      - uses: Swatinem/rust-cache@6323deb102c322ba6fcbdcafc7e3dddab59af2b6 # v2
      - uses: taiki-e/install-action@67729d5c413db75907f0ad1e39bb04b9c868ff60 # v2
        with:
          tool: cargo-audit,cargo-deny,cargo-machete,cargo-vet
      - name: cargo audit (RustSec advisories)
        run: cargo audit --deny warnings
      - name: cargo deny (licenses + bans + sources)
        run: cargo deny --all-features check
      - name: cargo machete (unused deps)
        run: cargo machete
      # A Renovate pull request that only moves Cargo.lock is a refresh of the
      # transitive tree, and cargo vet then reports every crate that changed
      # version as uncertified. That is tens of thousands of lines nobody reads,
      # every week, on a required check, which teaches people to click through a
      # gate that is supposed to mean something. Where the answer is always the
      # same the result is recorded rather than enforced.
      #
      # The author check is load-bearing, not decoration. Editing Cargo.lock
      # alone is enough to move a transitive crate to another version the
      # existing Cargo.toml constraints already allow, which is precisely the
      # unreviewed-code case cargo vet exists for and the one cargo audit, deny
      # and osv-scanner do not cover: they catch known-bad crates, not new ones.
      # Anyone but the bot keeps the hard gate, and so does main.
      - name: Is this a lockfile-only refresh
        id: vet_scope
        if: >-
          github.event_name == 'pull_request' &&
          github.event.pull_request.user.login == 'ferrlabs-renovate[bot]'
        env:
          BASE: ${{ github.event.pull_request.base.sha }}
        run: |
          changed=$(git diff --name-only "$BASE...HEAD")
          if echo "$changed" | grep -qE '(^|/)Cargo\.toml$'; then
            echo "advisory=false" >> "$GITHUB_OUTPUT"
          elif echo "$changed" | grep -qE '(^|/)Cargo\.lock$'; then
            echo "advisory=true" >> "$GITHUB_OUTPUT"
          else
            echo "advisory=false" >> "$GITHUB_OUTPUT"
          fi
      - name: cargo vet (supply-chain audit)
        id: vet
        continue-on-error: ${{ steps.vet_scope.outputs.advisory == 'true' }}
        run: cargo vet
      - name: Record an advisory cargo vet failure
        if: steps.vet.outcome == 'failure' && steps.vet_scope.outputs.advisory == 'true'
        run: |
          {
            echo '### cargo vet did not pass, and did not fail the build'
            echo
            echo 'This is a Renovate pull request that moves `Cargo.lock` without touching any'
            echo '`Cargo.toml`, where the step is advisory. It failed; the log above holds the'
            echo 'reason. Usually that is the refreshed crates being uncertified, but the'
            echo 'exemption is not conditional on the reason, so read the output before assuming'
            echo 'it is routine.'
            echo
            echo 'It still fails the build on `main`, on any pull request that edits a'
            echo '`Cargo.toml`, and on anything not opened by the bot. See FerrLabs/FerrFlow#1017.'
          } >> "$GITHUB_STEP_SUMMARY"

  build:
    name: Build Release Binary
    # Deliberately not `needs: test`. Nothing here consumes a test result, and
    # the wait put the release build, the fixture jobs behind it and therefore
    # the whole merge gate 1m10 later than they need to be. A failing test still
    # fails the run; it just no longer holds the queue.
    if: github.event_name != 'push' || !startsWith(github.event.head_commit.message, 'chore(release):')
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
      - uses: dtolnay/rust-toolchain@6bed0761d98439e5a578e2877258200ad565ba87 # stable
      - uses: Swatinem/rust-cache@6323deb102c322ba6fcbdcafc7e3dddab59af2b6 # v2
      - name: Build ferrflow
        run: cargo build --release
      - name: Upload binary
        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7
        with:
          name: ferrflow-binary
          path: target/release/ferrflow
          retention-days: 1

  fixture-generate:
    name: Generate Fixtures
    if: github.event_name != 'push' || !startsWith(github.event.head_commit.message, 'chore(release):')
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7

      - name: Cache generated fixtures
        id: fixture-cache
        uses: actions/cache@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6
        with:
          path: fixtures-generated
          key: fixtures-${{ hashFiles('tests/fixtures/definitions/**') }}

      - name: Generate fixtures
        if: steps.fixture-cache.outputs.cache-hit != 'true'
        uses: FerrLabs/Fixtures@7b04ba1b93ababf2b557ca4521a243c23217ef0a # v1.2.2 (packed repos)
        with:
          definitions: tests/fixtures/definitions

      - name: Resolve generated path
        id: path
        run: |
          if [ -d "fixtures-generated" ]; then
            echo "dir=fixtures-generated" >> "$GITHUB_OUTPUT"
          else
            for d in /tmp/tmp.*/generated; do
              if [ -d "$d" ]; then
                cp -r "$d" fixtures-generated
                echo "dir=fixtures-generated" >> "$GITHUB_OUTPUT"
                break
              fi
            done
          fi

      - name: Upload generated fixtures
        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7
        with:
          name: fixtures-generated
          path: fixtures-generated/
          include-hidden-files: true
          retention-days: 1

  fixture-monorepo:
    name: Fixtures — Monorepo
    needs: [build, fixture-generate]
    runs-on: ubuntu-latest
    timeout-minutes: 5
    steps:
      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
      - uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8
        with:
          name: ferrflow-binary
          path: bin/
      - uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8
        with:
          name: fixtures-generated
          path: fixtures-generated/
      - name: Run monorepo fixture tests
        env:
          FERRFLOW_BIN: ./bin/ferrflow
          DIFF_DIR: fixture-diffs
        run: |
          chmod +x ./bin/ferrflow
          mkdir -p filtered-fixtures
          for d in fixtures-generated/monorepo-*; do
            [ -d "$d" ] && cp -r "$d" filtered-fixtures/
          done
          bash tests/fixtures/run-tests.sh filtered-fixtures

      - name: Upload snapshot diffs
        if: failure()
        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7
        with:
          name: fixture-diffs-monorepo
          path: fixture-diffs/
          retention-days: 7
          if-no-files-found: ignore

  fixture-single:
    name: Fixtures — Single Package
    needs: [build, fixture-generate]
    runs-on: ubuntu-latest
    timeout-minutes: 5
    steps:
      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
      - uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8
        with:
          name: ferrflow-binary
          path: bin/
      - uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8
        with:
          name: fixtures-generated
          path: fixtures-generated/
      - name: Run single-package fixture tests
        env:
          FERRFLOW_BIN: ./bin/ferrflow
          DIFF_DIR: fixture-diffs
        run: |
          chmod +x ./bin/ferrflow
          mkdir -p filtered-fixtures
          for d in fixtures-generated/single-* fixtures-generated/multiple-* fixtures-generated/no-tags-initial-* fixtures-generated/no-versioned-* fixtures-generated/version-*; do
            [ -d "$d" ] && cp -r "$d" filtered-fixtures/
          done
          bash tests/fixtures/run-tests.sh filtered-fixtures

      - name: Upload snapshot diffs
        if: failure()
        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7
        with:
          name: fixture-diffs-single
          path: fixture-diffs/
          retention-days: 7
          if-no-files-found: ignore

  fixture-config:
    name: Fixtures — Config & Formats
    needs: [build, fixture-generate]
    runs-on: ubuntu-latest
    timeout-minutes: 5
    steps:
      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
      - uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8
        with:
          name: ferrflow-binary
          path: bin/
      - uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8
        with:
          name: fixtures-generated
          path: fixtures-generated/
      - name: Run config fixture tests
        env:
          FERRFLOW_BIN: ./bin/ferrflow
          DIFF_DIR: fixture-diffs
        run: |
          chmod +x ./bin/ferrflow
          mkdir -p filtered-fixtures
          for d in fixtures-generated/config-* fixtures-generated/format-* fixtures-generated/multi-versioned-*; do
            [ -d "$d" ] && cp -r "$d" filtered-fixtures/
          done
          bash tests/fixtures/run-tests.sh filtered-fixtures

      - name: Upload snapshot diffs
        if: failure()
        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7
        with:
          name: fixture-diffs-config
          path: fixture-diffs/
          retention-days: 7
          if-no-files-found: ignore

  fixture-advanced:
    name: Fixtures — Advanced Features
    needs: [build, fixture-generate]
    runs-on: ubuntu-latest
    timeout-minutes: 5
    steps:
      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
      - uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8
        with:
          name: ferrflow-binary
          path: bin/
      - uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8
        with:
          name: fixtures-generated
          path: fixtures-generated/
      - name: Run advanced fixture tests
        env:
          FERRFLOW_BIN: ./bin/ferrflow
          DIFF_DIR: fixture-diffs
        run: |
          chmod +x ./bin/ferrflow
          mkdir -p filtered-fixtures
          for d in fixtures-generated/prerelease-* fixtures-generated/hooks-* fixtures-generated/floating-* \
                   fixtures-generated/tag-* fixtures-generated/changelog-* fixtures-generated/versioning-* \
                   fixtures-generated/orphaned-* fixtures-generated/recover-* fixtures-generated/release-* \
                   fixtures-generated/head-* fixtures-generated/merge-* fixtures-generated/commit-* \
                   fixtures-generated/skip-* fixtures-generated/no-tags-monorepo-*; do
            [ -d "$d" ] && cp -r "$d" filtered-fixtures/
          done
          bash tests/fixtures/run-tests.sh filtered-fixtures

      - name: Upload snapshot diffs
        if: failure()
        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7
        with:
          name: fixture-diffs-advanced
          path: fixture-diffs/
          retention-days: 7
          if-no-files-found: ignore

  # Compile the bench binary ONCE per PR and hand it to the matrix shards
  # below. Before this split, every shard ran `cargo bench` with its own
  # cold rust-cache (all 11 shards start in parallel and share a key, so
  # nobody hits a sibling's cache), paying the ~5-7 min build cost 11
  # times. With a pre-built binary the matrix only does the actual
  # measurement step. See FerrLabs/FerrFlow#397.
  micro-bench-build:
    name: Build micro bench binary
    if: >-
      (github.event_name == 'push' && github.ref == 'refs/heads/main'
      && !startsWith(github.event.head_commit.message, 'chore(release):'))
      || github.event_name == 'workflow_dispatch'
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
      - uses: dtolnay/rust-toolchain@6bed0761d98439e5a578e2877258200ad565ba87 # stable
      - uses: Swatinem/rust-cache@6323deb102c322ba6fcbdcafc7e3dddab59af2b6 # v2
      - name: Compile bench binary (no run)
        run: cargo bench --bench ferrflow_benchmarks --no-run
      - name: Locate compiled binary
        id: locate
        run: |
          set -euo pipefail
          # criterion + cargo emit a hashed binary name like
          # ferrflow_benchmarks-1234abcd. Pick the most recent matching
          # executable and skip dSYMs, .d files, and pdbs.
          bin=$(find target/release/deps -maxdepth 1 -type f \
                  -name 'ferrflow_benchmarks-*' \
                  ! -name '*.d' ! -name '*.pdb' ! -name '*.dSYM' \
                  -printf '%T@ %p\n' \
                | sort -nr | head -n1 | cut -d' ' -f2-)
          if [ -z "$bin" ] || [ ! -x "$bin" ]; then
            echo "::error::could not find compiled bench binary under target/release/deps"
            ls -la target/release/deps/ferrflow_benchmarks-* 2>/dev/null || true
            exit 1
          fi
          echo "bin=$bin" >> "$GITHUB_OUTPUT"
          # Strip the hash so the matrix doesn't have to re-derive it.
          cp "$bin" target/release/deps/ferrflow_benchmarks
      - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7
        with:
          name: micro-bench-binary
          path: target/release/deps/ferrflow_benchmarks
          retention-days: 1
          if-no-files-found: error

  micro-bench:
    name: Micro Benchmark - ${{ matrix.group }}
    needs: micro-bench-build
    if: >-
      (github.event_name == 'push' && github.ref == 'refs/heads/main'
      && !startsWith(github.event.head_commit.message, 'chore(release):'))
      || github.event_name == 'workflow_dispatch'
    runs-on: ubuntu-latest
    continue-on-error: true
    strategy:
      fail-fast: false
      matrix:
        group:
          - commit_parsing
          - changelog
          - version_files
          - config_loading
          - git_commits
          - git_find_tag
          - git_collect_tags
          - git_changed_files
          - git_changed_since_tag
          - validate
          - full_check_flow
          - full_monorepo_flow
    steps:
      - uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8
        with:
          name: micro-bench-binary
          path: bench-bin/
      - name: Run group ${{ matrix.group }}
        # Mirrors what FerrLabs/Benchmarks@v3 used to do for the micro
        # path: invoke the bench binary directly with the criterion
        # positional filter, capture bencher-format stdout, and keep
        # only the well-formed `test ... bench: ...` rows so the aggregate
        # job's benchmark-action consumer doesn't choke on noise.
        # The bench binary's fixtures are all in-process (tempdir +
        # libgit2), so no checkout is needed in this job.
        run: |
          set +e
          chmod +x bench-bin/ferrflow_benchmarks
          ./bench-bin/ferrflow_benchmarks --bench --output-format bencher \
              "${{ matrix.group }}" \
              2> bench-stderr.log | tee raw-output.txt
          bench_exit=${PIPESTATUS[0]}
          set -e
          if [ "$bench_exit" != "0" ]; then
            echo "::warning::bench binary exited ${bench_exit} — tolerating as long as rows were captured. Stderr tail:"
            tail -40 bench-stderr.log || true
          fi
          grep -E '^test .+ \.\.\. bench:[[:space:]]+[0-9,]+ ns/iter' raw-output.txt > output.txt || true
          echo "---"
          echo "Filtered bencher output ($(wc -l < output.txt) lines kept):"
          cat output.txt
          if [ ! -s output.txt ]; then
            echo "::error::no well-formed benchmark rows captured; bench exit was ${bench_exit}"
            exit 1
          fi
      - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7
        with:
          name: micro-partial-${{ matrix.group }}
          path: output.txt
          retention-days: 1

  micro-bench-aggregate:
    name: Micro Benchmark (aggregate)
    needs: micro-bench
    if: >-
      (github.event_name == 'push' && github.ref == 'refs/heads/main'
      && !startsWith(github.event.head_commit.message, 'chore(release):'))
      || github.event_name == 'workflow_dispatch'
    runs-on: ubuntu-latest
    permissions:
      contents: write
      # A job-level block zeroes every scope it omits. The artifact lookup and
      # the cross-run download both read the Actions API, which happens to work
      # unauthenticated on a public repository and would 403 the day this one
      # turns private.
      actions: read
    steps:
      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
      - uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8
        with:
          pattern: micro-partial-*
          merge-multiple: true
          path: shards/
      - name: Merge partials
        run: |
          cat shards/* > output.txt
          echo "Merged bench rows: $(wc -l < output.txt)"
      - name: Find baseline artifact from main
        id: find-baseline
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          RUN_ID=$(gh api "repos/${{ github.repository }}/actions/artifacts?name=criterion-baseline&per_page=1" \
            --jq '.artifacts[0].workflow_run.id // empty')
          echo "run_id=${RUN_ID}" >> "$GITHUB_OUTPUT"
        continue-on-error: true
      - name: Download baseline
        if: steps.find-baseline.outputs.run_id
        uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8
        with:
          name: criterion-baseline
          path: baseline/
          run-id: ${{ steps.find-baseline.outputs.run_id }}
          github-token: ${{ secrets.GITHUB_TOKEN }}
        continue-on-error: true
      - name: Ensure baseline file
        run: |
          if [[ ! -f baseline/benchmark-data.json ]]; then
            mkdir -p baseline
            echo '[]' > baseline/benchmark-data.json
          fi
      - uses: benchmark-action/github-action-benchmark@4322e5726e6334590d251fc4f92bec0efafc45dc # v1.22.2
        with:
          tool: cargo
          output-file-path: output.txt
          external-data-json-path: baseline/benchmark-data.json
          comment-on-alert: true
          alert-threshold: '120%'
          fail-on-alert: false
          github-token: ${{ secrets.GITHUB_TOKEN }}
          comment-always: true
      # The step above appends this run to benchmark-data.json in place. Nothing
      # published it, so the download above has been finding only artifacts from
      # before #379, all long expired, and every comparison has been against an
      # empty history. Publishing it closes the loop.
      - name: Publish the updated baseline
        # Read on any trigger, write only from a push. A dispatch run off a
        # feature branch would otherwise become the newest baseline and the
        # next main run would compare against another machine's numbers.
        if: github.event_name == 'push'
        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7
        with:
          name: criterion-baseline
          path: baseline/benchmark-data.json
          retention-days: 90
          if-no-files-found: error

  bench-fixtures:
    name: Generate Benchmark Fixtures
    needs: test
    runs-on: ubuntu-latest
    if: (github.event_name == 'push' && github.ref == 'refs/heads/main') || github.event_name == 'workflow_dispatch'
    steps:
      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
      - name: Generate benchmark fixtures
        uses: FerrLabs/Fixtures@7b04ba1b93ababf2b557ca4521a243c23217ef0a # v1.2.2 (packed repos)
        with:
          definitions: benchmarks/fixtures/definitions
          generated-dir: bench-fixtures
      - name: Upload benchmark fixtures
        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7
        with:
          name: bench-fixtures
          path: bench-fixtures/
          include-hidden-files: true
          retention-days: 1
          if-no-files-found: error

  benchmark:
    name: Benchmark - ${{ matrix.fixture }}
    # One shard per fixture, so wall-clock is the slowest fixture rather than
    # the sum of all of them (mono-large dominates). Sharded per fixture and
    # never per tool: ferrflow-vs-competitor only means something when both ran
    # on the same machine, so every fixture's tools stay inside one runner.
    #
    # No Rust toolchain here on purpose: the binary comes from `build` and the
    # fixtures from `bench-fixtures`, so nothing in this job compiles.
    needs: [test, build, bench-fixtures]
    runs-on: ubuntu-latest
    if: (github.event_name == 'push' && github.ref == 'refs/heads/main') || github.event_name == 'workflow_dispatch'
    strategy:
      fail-fast: false
      matrix:
        fixture: [single, mono-small, mono-medium, mono-100-1k, mono-50-5k, mono-large, complex]
    steps:
      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
      - uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8
        with:
          name: ferrflow-binary
          path: bin/
      - uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8
        with:
          name: bench-fixtures
          path: bench-fixtures/
      - name: Isolate this shard's fixture
        env:
          FIXTURE: ${{ matrix.fixture }}
        run: |
          if [[ ! -d "bench-fixtures/$FIXTURE" ]]; then
            echo "::error::generated fixtures contain no '$FIXTURE'"
            ls -la bench-fixtures || true
            exit 1
          fi
          mkdir -p shard-fixtures
          cp -r "bench-fixtures/$FIXTURE" shard-fixtures/
          # The floor rides along in every shard, never as a shard of its own:
          # startup is a property of this runner, and shards land on different
          # machines, so subtracting one shard's floor from another's total
          # would measure the hardware gap instead of the work.
          if [[ ! -d "bench-fixtures/floor" ]]; then
            echo "::error::generated fixtures contain no 'floor'"
            exit 1
          fi
          cp -r bench-fixtures/floor shard-fixtures/
      - uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020 # v7
        with:
          node-version: '24'
      # Cache ~/.npm so the competitor npm-global installs that
      # `Benchmarks/scripts/run.sh` does (`npm install -g
      # @changesets/cli`, `commit-and-tag-version`, `standard-version`,
      # `semantic-release@23`, the `npx --yes release-please` size
      # measurement) reuse downloaded tarballs across runs instead of
      # re-fetching them every time. Key on the file that pins the
      # competitor set + their versions, with a wide fallback so a
      # version change still benefits from the previous cache shape.
      - name: Cache competitor npm globals
        uses: actions/cache@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6.1.0
        with:
          path: |
            ~/.npm
            ~/.cache/npx
          key: bench-npm-cache-${{ hashFiles('.github/workflows/ci.yml', 'benchmarks/fixtures/definitions/*.json') }}
          restore-keys: |
            bench-npm-cache-
      - uses: FerrLabs/Benchmarks@db1353fe328ac827ac3e1583167e43443c308655 # v5.6.3 (competitors bucketed as release-dry-run for a like-for-like head-to-head)
        with:
          type: full
          definitions: benchmarks/fixtures/definitions
          ferrflow-token: ${{ secrets.GITHUB_TOKEN }}
          skip-competitors: false
          verbose: true
          binary-dir: bin
          fixtures-dir: shard-fixtures
          shard: true
          # Sharding put wall-clock back at the slowest fixture, so spend the
          # headroom on samples: 30 runs tightens the median's standard error
          # by ~1.7x over the action's default of 10.
          runs: 30
          # The action defaults to 2. Three is what the published methodology
          # has always claimed, and the extra pass is cheap now that each shard
          # only carries one fixture.
          warmup: 3
      - name: Upload shard results
        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7
        with:
          name: bench-partial-${{ matrix.fixture }}
          path: benchmarks/results/latest.json
          retention-days: 1
          if-no-files-found: error

  benchmark-aggregate:
    name: Benchmark (aggregate)
    # Merges the shards and runs the regression check, comment and uploads once
    # over the whole result — the shards deliberately skip all of that.
    needs: benchmark
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
      - uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8
        with:
          pattern: bench-partial-*
          path: partials/
      - uses: FerrLabs/Benchmarks@db1353fe328ac827ac3e1583167e43443c308655 # v5.6.3 (competitors bucketed as release-dry-run for a like-for-like head-to-head)
        with:
          type: full
          definitions: benchmarks/fixtures/definitions
          ferrflow-token: ${{ secrets.GITHUB_TOKEN }}
          merge-partials: partials

  release:
    name: Release
    needs: [test, fixture-monorepo, fixture-single, fixture-config, fixture-advanced, benchmark-aggregate]
    runs-on: ubuntu-latest
    concurrency:
      group: release-${{ github.workflow }}-${{ github.ref }}
      cancel-in-progress: false
    if: |
      always() &&
      needs.test.result == 'success' &&
      needs.fixture-monorepo.result == 'success' &&
      needs.fixture-single.result == 'success' &&
      needs.fixture-config.result == 'success' &&
      needs.fixture-advanced.result == 'success' &&
      (needs.benchmark-aggregate.result == 'success' || needs.benchmark-aggregate.result == 'skipped') &&
      (
        (github.event_name == 'push' && github.ref == 'refs/heads/main') ||
        github.event_name == 'workflow_dispatch'
      )
    permissions:
      contents: write
      id-token: write
    steps:
      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
        with:
          fetch-depth: 0
          # Don't bake GITHUB_TOKEN into the git remote — ferrflow's OIDC
          # exchange yields an App installation token that authenticates as
          # ferrflow[bot]. Without this, every git push silently reverts
          # to GITHUB_TOKEN (i.e. github-actions[bot]) which isn't in the
          # branch-rule bypass list and can't push to main.
          persist-credentials: false
      - uses: dtolnay/rust-toolchain@6bed0761d98439e5a578e2877258200ad565ba87 # stable
      - uses: Swatinem/rust-cache@6323deb102c322ba6fcbdcafc7e3dddab59af2b6 # v2
      - name: Build ferrflow
        run: cargo build --release
      # Git identity is configured by the binary itself (see
      # ensure_bot_token in src/bot_token.rs) when FERRFLOW_BOT=true.
      # Before the release, not after: `auto_stage_new_files` diffs the dirty
      # set around each hook, so anything already modified when ferrflow starts
      # is invisible to it. The hook reads this path and writes into
      # docs/site/data, which is how the numbers reach the published package.
      - name: Download benchmark data for the release
        id: bench
        if: needs.benchmark-aggregate.result == 'success'
        uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8
        with:
          name: hyperfine-baseline
          path: ${{ runner.temp }}/bench
        continue-on-error: true

      - name: Run ferrflow release
        env:
          FERRFLOW_BOT: "true"
          FERRFLOW_BENCHMARK_JSON: ${{ steps.bench.outcome == 'success' && format('{0}/bench/latest.json', runner.temp) || '' }}
        run: ./target/release/ferrflow ${{ inputs.dry_run == 'true' && '--dry-run' || '' }} release --draft
      - name: Download benchmark summary
        if: needs.benchmark-aggregate.result == 'success'
        uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8
        with:
          name: benchmark-release-summary
          path: benchmark-summary/
        continue-on-error: true
      - name: Append benchmark results to draft release
        if: needs.benchmark-aggregate.result == 'success'
        id: append-bench
        run: |
          BENCH_FILE="benchmark-summary/release-summary.md"
          if [[ ! -f "$BENCH_FILE" ]]; then
            echo "No benchmark summary found, skipping"
            exit 0
          fi
          TAG=$(./target/release/ferrflow tag --json 2>/dev/null | jq -r '.tag // empty')
          if [[ -z "$TAG" ]]; then
            echo "No tag found, skipping"
            exit 0
          fi
          CURRENT_BODY=$(gh release view "$TAG" --json body --jq '.body' 2>/dev/null || echo "")
          BENCH=$(cat "$BENCH_FILE")
          # Remove existing Performance section to avoid duplicates
          CLEAN_BODY=$(echo "$CURRENT_BODY" | sed '/^## Performance$/,$d')
          printf -v NEW_BODY '%s\n\n%s' "$CLEAN_BODY" "$BENCH"
          gh release edit "$TAG" --notes "$NEW_BODY"
          echo "tag=$TAG" >> "$GITHUB_OUTPUT"
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}