FROM alpine:3.22.2

# Install packages needed in both building and running.
RUN apk update && \
    apk add --no-cache \
    libstdc++

# Install tools required for building.
RUN mkdir -p /root/.local/bin
ENV PATH="${PATH}:/root/.local/bin"

RUN apk add --no-cache \
    autoconf \
    bash \
    binutils \
    build-base \
    cmake \
    clang \
    clang-extra-tools \
    gdb \
    git \
    libtool \
    linux-headers \
    ninja \
    m4 \
    perl \
    python3 \
    pipx

# Install tools we need for building the cross compiler.
RUN apk add --no-cache \
    gpg \
    gpg-agent \
    automake \
    flex \
    make \
    texinfo \
    xz \
    help2man \
    gawk \
    bison \
    ncurses-dev \
    rsync \
    wget

RUN mkdir -p /workspace
WORKDIR /workspace

# Download crosstool-ng that we use to build the cross compiler.
RUN <<EOF
    gpg --keyserver pgp.surfnet.nl --recv-keys 721B0FB1CDC8318AEBB888B809F6DD5F1F30EF2E
    wget http://crosstool-ng.org/download/crosstool-ng/crosstool-ng-1.28.0.tar.bz2.sig
    wget http://crosstool-ng.org/download/crosstool-ng/crosstool-ng-1.28.0.tar.bz2
    gpg --verify crosstool-ng-1.28.0.tar.bz2.sig
    tar -xjf crosstool-ng-1.28.0.tar.bz2
    mv /workspace/crosstool-ng-1.28.0 /crosstool
EOF

# - Add a user that we need for building (crosstool-ng requires non-root user for that).
# - Add some directories we need in the future for building.
# - Build crosstool-ng, which in it's turn will be used to build the cross compiler.

ENV CROSS_DESTDIR=/x-tools

WORKDIR /crosstool
RUN <<EOF
    adduser -D crosstoolng    

    mkdir -p /home/crosstoolng/src
    mkdir -p $CROSS_DESTDIR

    ./bootstrap
    ./configure
    make DESTDIR=$CROSS_DESTDIR
    make install

    chown -R crosstoolng:crosstoolng /crosstool
    chown -R crosstoolng:crosstoolng $CROSS_DESTDIR
    chown -R crosstoolng:crosstoolng /home/crosstoolng
EOF

# We now have crosstool-ng built and ready to be used for building the cross-compiler that we actually want. To
# do that we need to feed some configuration

WORKDIR /workspace
ADD --chmod=544 ./scripts/create-cross-compiler.py . 
ADD --chmod=544 ./scripts/entrypoint.sh . 

ENTRYPOINT ["./entrypoint.sh"]