bdd/cpp/Dockerfile

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# C++ BDD harness, built in three stages so the runtime image carries only what the test run
# needs (~330 MB instead of ~10 GB for a single toolchain image):
#   1. build   - Bazel builds the cucumber-cpp wire server from the foreign/cpp module, where a
#                symlink exposes the step definitions stored under bdd/cpp; rules_rust fetches
#                its own Rust toolchain, so no system Rust is needed.
#   2. deps    - Bundler installs the Ruby Cucumber runner (compiles the ffi native extension).
#   3. runtime - copies the wire server binary and the vendored gems, then runs cucumber.
# cucumber-cpp v0.8.0 is wire-only: the Ruby runner reads the shared feature files and drives
# the C++ wire server over the wire protocol.

# Stage 1: build the wire server with Bazel.
FROM gcr.io/bazel-public/bazel:9.2.0 AS build

USER root
WORKDIR /workspace
COPY . .

RUN cd foreign/cpp \
    && bazel build --config=ci //:bdd_wire_server \
    && cp bazel-bin/bdd_wire_server /tmp/bdd_wire_server

# Stage 2: install the Ruby Cucumber runner. build-essential is needed to compile gems that
# ship no precompiled binary for the platform (e.g. ffi) and never reaches the runtime image.
# Ruby stays pinned to 3.3: cucumber 7.1.0 crashes on ruby 3.4 at load time ("unknown
# keywords: :strict, :proc" - ruby 3.4 added keyword arguments to Hash.new and cucumber's
# DataTable trips over it), so bump cucumber before bumping this base image.
FROM ruby:3.3-slim-trixie AS deps

RUN apt-get update && apt-get install --yes --no-install-recommends \
        build-essential \
    && rm -rf /var/lib/apt/lists/*

WORKDIR /workspace/bdd/cpp
COPY bdd/cpp/Gemfile bdd/cpp/Gemfile.lock ./
# Frozen install: any drift between Gemfile and Gemfile.lock fails the build instead of
# being silently re-resolved.
RUN gem install bundler -v 2.6.9 --no-document \
    && BUNDLE_FROZEN=true bundle install

# Stage 3: runtime image.
FROM ruby:3.3-slim-trixie

# The wire server is a C++ binary and needs the C++ runtime at run time.
RUN apt-get update && apt-get install --yes --no-install-recommends \
        libstdc++6 \
    && rm -rf /var/lib/apt/lists/*

COPY --from=deps /usr/local/bundle /usr/local/bundle
COPY --from=build /tmp/bdd_wire_server /usr/local/bin/bdd_wire_server

WORKDIR /workspace/bdd/cpp
COPY bdd/cpp/Gemfile bdd/cpp/Gemfile.lock ./
COPY bdd/cpp/features ./features

# Entrypoint: copy the mounted shared feature files, start the wire server, then run cucumber.
COPY bdd/cpp/scripts/entrypoint.sh /entrypoint.sh
RUN chmod +x /entrypoint.sh

ENTRYPOINT ["/entrypoint.sh"]