protobuf.yaml

name: protobuf_compatibility

on:
  pull_request:
    branches: [ "*" ]
  push:
    # protobuf compatibility is a transitive property,
    # but it requires all the transitions to be checked.
    # If we checked it just against the PR branches,
    # we may end up with conflicting PRs getting merged
    # (unless we improve our github setup).
    # Therefore on post-merge we will execute the
    # compatibility check as well (TODO: alerting).
    branches: ["main"]

env:
  CARGO_TERM_COLOR: always
  CARGO_INCREMENTAL: "0"
  RUSTFLAGS: "-Dwarnings -C linker=clang -C link-arg=-fuse-ld=lld -C link-arg=-Wl,-z,nostart-stop-gc"
  RUSTC_WRAPPER: "sccache"
  SCCACHE_GHA_ENABLED: "true"
  RUST_BACKTRACE: "1"

jobs:
  compatibility:
    runs-on: [ubuntu-22.04-github-hosted-16core]
    steps:
      # github.base_ref -> github.head_ref for pull_request
      # github.event.before -> github.event.after for push
      - uses: mozilla-actions/sccache-action@v0.0.3
      - uses: actions/checkout@v4
        with:
          ref: ${{ github.base_ref || github.event.before }}
          path: before
      - name: compile before
        run: cargo build --all-targets
        working-directory: ./before/node
      - name: build before.binpb
        run: >
          perl -ne 'print "$1\n" if /PROTOBUF_DESCRIPTOR="(.*)"/'
          `find ./before/node/target/debug/build/*/output`
          | xargs cat > ./before.binpb
      - uses: actions/checkout@v4
        with:
          ref: ${{ github.head_ref || github.event.after }}
          path: after
      - name: compile after
        run: cargo build --all-targets
        working-directory: ./after/node
      - name: build after.binpb
        run: >
          perl -ne 'print "$1\n" if /PROTOBUF_DESCRIPTOR="(.*)"/'
          `find ./after/node/target/debug/build/*/output`
          | xargs cat > ./after.binpb
      - uses: bufbuild/buf-setup-action@v1
      - uses: bufbuild/buf-breaking-action@v1
        with:
          input: "./after.binpb"
          against: "./before.binpb"