Dockerfile.jruby

# JRuby verification image for RBS.
#
# RBS can't load its MRI C extension on JRuby, so it parses through a
# WebAssembly build of the parser (see lib/rbs/wasm and docs/wasm_serialization.md).
# This single-stage image installs the WASI SDK, compiles rbs_parser.wasm and
# vendors the Chicory/ASM jars into lib/rbs/wasm/, then runs the test suite on
# JRuby. It mirrors .github/workflows/jruby.yml but is fully self-contained.
#
#   docker build -f Dockerfile.jruby -t rbs-jruby .
#   docker run --rm rbs-jruby                                  # run the test suite
#   docker run --rm -e RBS_PLATFORM=java rbs-jruby \
#     gem build rbs.gemspec                                    # build the -java gem
#
# Bundler is intentionally not used: the development Gemfile pulls in CRuby-only
# C extensions (bigdecimal, stackprof, ...) that cannot build on JRuby. The few
# gems the suite needs are installed directly, exactly as the CI does.

FROM jruby:10.0.6-jdk21

# Keep in sync with .github/workflows/wasm.yml and .github/workflows/jruby.yml.
ARG WASI_SDK_VERSION=33
ARG WASI_SDK_RELEASE=33.0

# build-essential supplies cc/make: on JRuby the prism gem builds libprism.so
# (loaded via FFI) instead of an MRI C extension, so it needs a C toolchain.
RUN apt-get update \
    && apt-get install -y --no-install-recommends git curl ca-certificates build-essential \
    && rm -rf /var/lib/apt/lists/*

# The WASI SDK provides clang, the wasi-libc sysroot and the wasm32 compiler-rt
# builtins that `rake wasm:build` needs to compile src/**/*.c to WebAssembly.
RUN set -eux; \
    case "$(uname -m)" in \
      x86_64 | amd64)  wasi_arch=x86_64 ;; \
      aarch64 | arm64) wasi_arch=arm64  ;; \
      *) echo "unsupported arch: $(uname -m)" >&2; exit 1 ;; \
    esac; \
    mkdir -p /opt/wasi-sdk; \
    curl -fsSL "https://github.com/WebAssembly/wasi-sdk/releases/download/wasi-sdk-${WASI_SDK_VERSION}/wasi-sdk-${WASI_SDK_RELEASE}-${wasi_arch}-linux.tar.gz" \
      | tar xz --strip-components=1 -C /opt/wasi-sdk
ENV WASI_SDK_PATH=/opt/wasi-sdk

# Runtime/test gems the suite needs on JRuby (same set as the jruby.yml CI).
RUN gem install prism rake rake-compiler test-unit rdoc rspec minitest json-schema pry --no-document

WORKDIR /rbs
COPY . .

# Assemble the JRuby runtime: compile rbs_parser.wasm and download the
# Chicory + ASM jars into lib/rbs/wasm/. Runs on JRuby (clang is a subprocess,
# so the build is engine independent).
RUN rake wasm:jruby_setup

CMD ["rake", "test"]