FROM debian:bookworm

# Install all build dependencies
RUN apt-get update && apt-get install -y \
    build-essential \
    git \
    curl \
    wget \
    bzip2 \
    unzip \
    ca-certificates \
    python3 \
    file \
    g++ \
    make \
    libncurses-dev \
    rsync \
    bc \
    patch \
    perl \
    cpio \
    sudo \
    xz-utils \
    gnupg \
    flex \
    bison \
    texinfo


# Create non-root user and setup environment
RUN useradd -m -s /bin/bash buildroot && \
    echo "buildroot ALL=(ALL) NOPASSWD:ALL" >> /etc/sudoers

# Buildroot version
ENV BUILDROOT_VERSION=2025.05
ENV BUILDROOT_DIR=/home/buildroot/buildroot

USER buildroot
WORKDIR /home/buildroot

# Download and extract Buildroot
RUN mkdir -p $BUILDROOT_DIR && \
    curl -LO https://buildroot.org/downloads/buildroot-${BUILDROOT_VERSION}.tar.gz && \
    tar -xzf buildroot-${BUILDROOT_VERSION}.tar.gz -C /home/buildroot && \
    rm buildroot-${BUILDROOT_VERSION}.tar.gz && \
    mv /home/buildroot/buildroot-${BUILDROOT_VERSION}/* $BUILDROOT_DIR

# Set up workdir
WORKDIR $BUILDROOT_DIR

# Unset host compiler env vars
ENV CC=
ENV CXX=


COPY .config .config
RUN make -j16

# Done — toolchain will be in /opt/buildroot/output/host
# Rootfs (if selected) will be in /opt/buildroot/output/images

# Set default workdir in case user wants to enter
RUN echo 'export "PATH=/home/buildroot/buildroot/output/host/bin:$PATH"' >> ~/.bashrc

WORKDIR /build

CMD ["/bin/bash"]