release.yml

name: Release

# Tag-driven. The tag is the only input: it names the version, stamps the
# binary, and tags the image.
on:
  push:
    tags: ["v*"]
  # Lets a maintainer rehearse the whole gate — including the conformance run
  # against the real container — without cutting a release. Nothing publishes
  # on this path.
  workflow_dispatch:

permissions:
  contents: read

jobs:
  # Everything that can say no runs before anything that publishes. The
  # conformance suite is the gate: an emulator that does not match its own
  # recorded fixtures has no business being tagged.
  verify:
    name: Test and conformance
    runs-on: ubuntu-latest
    outputs:
      version: ${{ steps.version.outputs.version }}
    steps:
      - uses: actions/checkout@v7

      - uses: actions/setup-go@v6
        with:
          go-version: "1.25"
          cache: true

      - name: Resolve version
        id: version
        run: |
          if [ "${GITHUB_REF_TYPE}" = "tag" ]; then
            version="${GITHUB_REF_NAME}"
          else
            version="dev-${GITHUB_SHA::12}"
          fi
          echo "version=${version}" >> "$GITHUB_OUTPUT"
          echo "building ${version}"

      - name: Vet
        run: go vet ./...

      - name: gofmt
        run: |
          fmtout=$(gofmt -l .)
          if [ -n "$fmtout" ]; then
            echo "These files are not gofmt-clean:"
            echo "$fmtout"
            exit 1
          fi

      - name: Test with race
        run: go test -race ./...

      - name: Build the candidate
        run: |
          CGO_ENABLED=0 go build -trimpath \
            -ldflags "-s -w -X github.com/intentius/m80.Version=${{ steps.version.outputs.version }}" \
            -o m80 ./cmd/m80
          ./m80 -version

      # The candidate answers the suite before anything is published. m80 is
      # stateful and reserves image names through the async delete window, so
      # this instance is used once and thrown away.
      - name: Conformance against the candidate
        run: |
          ./m80 -addr :4290 -build-delay 300ms &
          for _ in $(seq 1 30); do
            curl -sf http://localhost:4290/_m80/health >/dev/null && break
            sleep 0.2
          done
          go run ./conformance/cmd/conformance \
            -endpoint http://localhost:4290 -poll-timeout 20 \
            -vm-endpoint-rewrite http://localhost:4290

      # Coverage is a release note, not a gate: a suite that skipped half the
      # surface could still be green.
      - name: Report operation coverage
        run: |
          ./m80 -addr :4291 >/dev/null 2>&1 &
          for _ in $(seq 1 30); do
            curl -sf http://localhost:4291/_m80/health >/dev/null && break
            sleep 0.2
          done
          curl -s http://localhost:4291/_m80/health | tee health.json
          python3 - <<'PY' >> "$GITHUB_STEP_SUMMARY"
          import json
          d = json.load(open("health.json"))["coverage"]
          print(f"### Coverage\n\n`{d['implemented']}/{d['total']}` operations implemented.\n")
          if d["notImplementedYet"]:
              print("Not implemented: " + ", ".join(d["notImplementedYet"]))
          PY

  # Built from the same commit the gate ran on, and checked again as a real
  # container before it is pushed. The acceptance for #16 is that
  # `docker run ghcr.io/intentius/m80` serves the API, so that is what gets
  # tested rather than the binary a second time.
  image:
    name: Image
    needs: verify
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write
    steps:
      - uses: actions/checkout@v7

      - uses: actions/setup-go@v6
        with:
          go-version: "1.25"
          cache: true

      - uses: docker/setup-qemu-action@v4
      - uses: docker/setup-buildx-action@v4

      # Load the native image locally first so the suite can run against a
      # real container. Multi-arch cannot be --load, which is why this is a
      # separate build from the push below; both use the same cache.
      - name: Build amd64 image
        uses: docker/build-push-action@v7
        with:
          context: .
          load: true
          platforms: linux/amd64
          build-args: VERSION=${{ needs.verify.outputs.version }}
          tags: m80:candidate
          cache-from: type=gha
          cache-to: type=gha,mode=max

      - name: Conformance against the container
        run: |
          docker run -d --name m80 -p 4290:4290 m80:candidate -build-delay 300ms
          for _ in $(seq 1 60); do
            curl -sf http://localhost:4290/_m80/health >/dev/null && break
            sleep 0.5
          done
          go run ./conformance/cmd/conformance \
            -endpoint http://localhost:4290 -poll-timeout 20 \
            -vm-endpoint-rewrite http://localhost:4290
          docker rm -f m80

      # The conformance suite proves the candidate answers like AWS. This
      # proves the README works against it, which is a different claim and
      # the one a newcomer cares about first.
      - name: README quick start against the container
        run: ./scripts/smoke.sh m80:candidate

      - name: Log in to GHCR
        if: github.ref_type == 'tag'
        uses: docker/login-action@v4
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Build and push multi-arch
        if: github.ref_type == 'tag'
        uses: docker/build-push-action@v7
        with:
          context: .
          push: true
          platforms: linux/amd64,linux/arm64
          build-args: VERSION=${{ needs.verify.outputs.version }}
          tags: |
            ghcr.io/intentius/m80:${{ needs.verify.outputs.version }}
            ghcr.io/intentius/m80:latest
          cache-from: type=gha
          cache-to: type=gha,mode=max

  binaries:
    name: Binaries and release
    needs: [verify, image]
    runs-on: ubuntu-latest
    permissions:
      contents: write
    steps:
      - uses: actions/checkout@v7

      - uses: actions/setup-go@v6
        with:
          go-version: "1.25"
          cache: true

      # Cross-compiling is free here: no cgo, no build tags, one binary per
      # platform from the same source the gate ran against.
      - name: Build
        run: |
          mkdir -p dist
          for target in linux/amd64 linux/arm64 darwin/amd64 darwin/arm64; do
            os="${target%/*}"; arch="${target#*/}"
            CGO_ENABLED=0 GOOS="$os" GOARCH="$arch" go build -trimpath \
              -ldflags "-s -w -X github.com/intentius/m80.Version=${{ needs.verify.outputs.version }}" \
              -o "dist/m80_${os}_${arch}" ./cmd/m80
          done
          cd dist && sha256sum m80_* > checksums.txt && cat checksums.txt

      - uses: actions/upload-artifact@v7
        with:
          name: m80-binaries
          path: dist/

      - name: Publish release
        if: github.ref_type == 'tag'
        env:
          GH_TOKEN: ${{ github.token }}
        run: |
          gh release create "${GITHUB_REF_NAME}" \
            --title "m80 ${GITHUB_REF_NAME}" \
            --generate-notes \
            dist/*