Dockerfile.dev

FROM debian:bookworm-slim

ENV DEBIAN_FRONTEND=noninteractive

# System packages for building Rust projects and general development
RUN apt-get update && apt-get install -y --no-install-recommends \
    git \
    ca-certificates \
    curl \
    make \
    pkg-config \
    build-essential \
    gcc \
    g++ \
    musl-tools \
    musl-dev \
    libssl-dev \
    && rm -rf /var/lib/apt/lists/*

RUN { id -u amux >/dev/null 2>&1 \
       || useradd -m -s /bin/bash -d /home/amux amux 2>/dev/null \
       || useradd -s /bin/bash -d /home/amux amux ; } \
    && mkdir -p /workspace /home/amux \
    && chown -R amux:amux /workspace /home/amux

USER amux

# Install Rust via rustup (stable toolchain)
ENV RUSTUP_HOME=/home/amux/.rustup \
    CARGO_HOME=/home/amux/.cargo \
    PATH=/home/amux/.cargo/bin:/home/amux/.local/bin:$PATH

RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | \
    sh -s -- -y --default-toolchain stable --profile default && \
    rustup component add clippy rustfmt rust-analyzer && \
    rustup target add x86_64-unknown-linux-musl

# Pre-fetch and cache dependencies by building a dummy project first
# This layer is invalidated only when Cargo.toml changes
WORKDIR /workspace
COPY Cargo.toml ./
RUN mkdir -p src && \
    echo 'fn main() {}' > src/main.rs && \
    echo '' > src/lib.rs && \
    cargo fetch && \
    rm -rf src

COPY . .

CMD ["/bin/bash"]