tunnel.yml

name: Tunnel CI & Release

on:
  push:
    branches: [main]
    tags: ["tunnel-v*"]
    paths:
      - "tunnel/**"
      - ".github/workflows/tunnel.yml"
  pull_request:
    branches: [main]
    paths:
      - "tunnel/**"
      - ".github/workflows/tunnel.yml"

env:
  CARGO_TERM_COLOR: always
  RUSTFLAGS: "-Dwarnings"
  REGISTRY: ghcr.io
  SIDECAR_IMAGE: ${{ github.repository_owner }}/mailcue-relay-sidecar

jobs:
  # -----------------------------------------------------------------
  # Lint, format check, clippy, tests — single job on the host runner.
  # Pinned via tunnel/rust-toolchain.toml (1.95).
  # -----------------------------------------------------------------
  lint:
    name: Rust Lint, Format, Clippy & Test
    runs-on: ubuntu-latest
    defaults:
      run:
        working-directory: tunnel
    steps:
      - uses: actions/checkout@v7

      - name: Cache cargo registry & target
        uses: actions/cache@v5
        with:
          path: |
            ~/.cargo/registry
            ~/.cargo/git
            tunnel/target
          key: tunnel-${{ runner.os }}-cargo-${{ hashFiles('tunnel/Cargo.lock') }}
          restore-keys: |
            tunnel-${{ runner.os }}-cargo-

      - name: Install toolchain components
        run: |
          rustup show active-toolchain
          rustup component add rustfmt clippy

      - name: Format check
        run: cargo fmt --all -- --check

      - name: Clippy (deny warnings)
        run: cargo clippy --workspace --all-targets --locked -- -D warnings

      - name: Test
        run: cargo test --workspace --locked

  # -----------------------------------------------------------------
  # Build static musl binaries for amd64 + arm64 on every push to main
  # and every tunnel-v* tag. Releases attach the binaries as assets.
  # -----------------------------------------------------------------
  build-binaries:
    name: Build ${{ matrix.target }} (${{ matrix.bin }})
    needs: lint
    runs-on: ubuntu-latest
    strategy:
      fail-fast: false
      matrix:
        target:
          - x86_64-unknown-linux-musl
          - aarch64-unknown-linux-musl
        bin:
          - mailcue-relay-edge
          - mailcue-relay-sidecar
    defaults:
      run:
        working-directory: tunnel
    steps:
      - uses: actions/checkout@v7

      - name: Install cross
        run: |
          cargo install cross --locked --version ^0.2

      - name: Cache cargo registry & target
        uses: actions/cache@v5
        with:
          path: |
            ~/.cargo/registry
            ~/.cargo/git
            tunnel/target
          key: tunnel-${{ runner.os }}-cargo-${{ matrix.target }}-${{ hashFiles('tunnel/Cargo.lock') }}
          restore-keys: |
            tunnel-${{ runner.os }}-cargo-${{ matrix.target }}-

      - name: Build (release, static musl)
        run: |
          cross build --release --locked \
            --target ${{ matrix.target }} \
            --bin ${{ matrix.bin }}

      - name: Stage artifact
        run: |
          mkdir -p ../dist
          ARTIFACT="${{ matrix.bin }}-${{ matrix.target }}"
          cp "target/${{ matrix.target }}/release/${{ matrix.bin }}" "../dist/${ARTIFACT}"
          (cd ../dist && sha256sum "${ARTIFACT}" > "${ARTIFACT}.sha256")

      - uses: actions/upload-artifact@v7
        with:
          name: ${{ matrix.bin }}-${{ matrix.target }}
          path: dist/${{ matrix.bin }}-${{ matrix.target }}*
          if-no-files-found: error
          retention-days: 14

  # -----------------------------------------------------------------
  # Tagged release: pull all artifacts, write a combined SHA256SUMS,
  # publish a GitHub release that install-edge.sh can download from.
  # -----------------------------------------------------------------
  release:
    name: Publish Release
    if: startsWith(github.ref, 'refs/tags/tunnel-v')
    needs: build-binaries
    runs-on: ubuntu-latest
    permissions:
      contents: write
    steps:
      - uses: actions/checkout@v7

      # Pattern-filter so we only pull the binary artifacts we uploaded
      # in the build-binaries job. Without this, `download-artifact`
      # also tries to fetch the auxiliary `*.dockerbuild` summary blob
      # produced by docker/build-push-action and a transient retry-
      # exhausted failure on that side artifact fails the whole job.
      - uses: actions/download-artifact@v8
        with:
          path: dist
          pattern: mailcue-relay-*
          merge-multiple: true

      # Bundle the systemd unit into the release so install-edge.sh can
      # fetch it directly from the release URL when the script itself
      # is being curl|bash-ed onto a fresh VPS (no local checkout).
      - name: Stage systemd unit
        run: |
          cp tunnel/deploy/systemd/mailcue-relay-edge.service dist/

      - name: Combined SHA256SUMS
        working-directory: dist
        run: |
          rm -f SHA256SUMS
          # shellcheck disable=SC2035
          sha256sum mailcue-relay-* mailcue-relay-edge.service > SHA256SUMS
          cat SHA256SUMS

      - name: GitHub Release
        uses: softprops/action-gh-release@v3
        with:
          tag_name: ${{ github.ref_name }}
          name: ${{ github.ref_name }}
          generate_release_notes: true
          files: |
            dist/mailcue-relay-edge-*
            dist/mailcue-relay-sidecar-*
            dist/mailcue-relay-edge.service
            dist/SHA256SUMS

  # -----------------------------------------------------------------
  # Sidecar Docker image: built from tunnel/deploy/docker/Dockerfile.sidecar
  # and pushed to GHCR on main + tunnel-v* tags. Multi-arch via buildx.
  # -----------------------------------------------------------------
  sidecar-image:
    name: Build & Push Sidecar Image
    if: github.event_name == 'push'
    needs: lint
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write
    steps:
      - uses: actions/checkout@v7

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

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

      - name: Log in to GHCR
        uses: docker/login-action@v4
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Generate tags
        id: meta
        uses: docker/metadata-action@v6
        with:
          images: ${{ env.REGISTRY }}/${{ env.SIDECAR_IMAGE }}
          tags: |
            type=raw,value=latest,enable={{is_default_branch}}
            type=match,pattern=tunnel-v(.*),group=1
            type=sha,prefix=

      - uses: docker/build-push-action@v7
        with:
          context: tunnel
          file: tunnel/deploy/docker/Dockerfile.sidecar
          platforms: linux/amd64,linux/arm64
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=gha,scope=tunnel-sidecar
          cache-to: type=gha,mode=max,scope=tunnel-sidecar