FROM ghcr.io/cross-rs/x86_64-unknown-linux-gnu:main

# Native amd64 build inside the cross container — no multiarch foreign arch
# needed since the base image is already x86_64. Just install the dev libs
# straight into the host arch.
RUN apt-get update && \
    apt-get --assume-yes install --no-install-recommends \
        curl \
        unzip \
        ca-certificates \
        libasound2-dev \
        libdbus-1-dev \
        libsystemd-dev && \
    rm -rf /var/lib/apt/lists/*

# Modern protoc — the distro package on this base image is too old to
# recognise proto3 `optional`. See Dockerfile.arm-unknown-linux-gnueabihf
# for the full context.
ARG PROTOC_VERSION=25.1
RUN curl -fsSL "https://github.com/protocolbuffers/protobuf/releases/download/v${PROTOC_VERSION}/protoc-${PROTOC_VERSION}-linux-x86_64.zip" -o /tmp/protoc.zip && \
    unzip -q /tmp/protoc.zip -d /usr/local && \
    rm /tmp/protoc.zip && \
    chmod +x /usr/local/bin/protoc && \
    protoc --version