# DarkRoom — macOS link check
#
# Compiles and links for macOS from Linux, with zig as the linker
# (cargo-zigbuild). Zig carries macOS's libSystem stubs and C headers, so the
# crates that need only libSystem — the inference engine, dr-plat — build,
# link and produce Mach-O test binaries here. Nothing runs: there is no macOS
# to run them on (docs/dev/macos.md §2). The desktop app needs Apple's
# framework headers (AppKit, Metal, Security), which only the Xcode SDK
# carries, so it does not link here.
#
# Build:  docker build -t darkroom-macos:latest docker/macos
# Use:    ./docker/macos/build.sh cargo zigbuild --target aarch64-apple-darwin -p dr-inference-engine --all-targets

FROM docker.io/library/debian:trixie-slim

# Pinned, like the Windows and Android images. Rust matches rust-toolchain.toml.
ARG RUST_VERSION=1.92.0
ARG ZIG_VERSION=0.15.2
ARG ZIG_SHA256=02aa270f183da276e5b5920b1dac44a63f1a49e55050ebde3aecc9eb82f93239
ARG CARGO_ZIGBUILD_VERSION=0.23.4

ENV DEBIAN_FRONTEND=noninteractive \
    CARGO_HOME=/opt/cargo \
    RUSTUP_HOME=/opt/rustup \
    PATH=/opt/zig:/opt/cargo/bin:$PATH

RUN apt-get update && apt-get install -y --no-install-recommends \
        ca-certificates curl git xz-utils \
        # A host C compiler: build scripts and proc-macros are Linux binaries.
        gcc libc6-dev \
        # `file` says Mach-O; the smoke check in build.sh reads it.
        file \
    && rm -rf /var/lib/apt/lists/*

RUN curl -fsSL "https://ziglang.org/download/${ZIG_VERSION}/zig-x86_64-linux-${ZIG_VERSION}.tar.xz" -o /tmp/zig.tar.xz \
    && echo "${ZIG_SHA256}  /tmp/zig.tar.xz" | sha256sum -c - \
    && mkdir /opt/zig && tar xJf /tmp/zig.tar.xz -C /opt/zig --strip-components=1 \
    && rm /tmp/zig.tar.xz && zig version

# The components rust-toolchain.toml lists, baked in so rustup does not fetch
# them inside every run.
RUN curl -fsSL https://sh.rustup.rs | sh -s -- -y --profile minimal \
        --default-toolchain "${RUST_VERSION}" \
        --component rustfmt,clippy,rust-analyzer \
        --target aarch64-apple-darwin,x86_64-apple-darwin \
    && cargo install --locked "cargo-zigbuild@${CARGO_ZIGBUILD_VERSION}" \
    && rm -rf /opt/cargo/registry \
    && chmod -R a+rwX /opt/cargo /opt/rustup