# Copyright (c) 2022-2024 Sebastian Pipping <sebastian@pipping.org>
# Licensed under the Apache License version 2.0

FROM alpine
RUN apk add --update \
            diffutils \
            git \
            sed \
        && \
    git clone --depth 1 --branch 3.11 https://github.com/python/cpython cpython-3-11 \
        && \
    ( cd cpython-3-11 && git rev-parse HEAD ) \
        && \
    git clone --depth 1 --branch libexpat-2.6.0-3.11 https://github.com/sethmlarson/cpython cpython-pr \
        && \
    ( cd cpython-pr && git rev-parse HEAD ) \
        && \
    git config --global advice.detachedHead false \
        && \
    git clone --depth 1 --branch R_2_5_0 https://github.com/libexpat/libexpat libexpat_2_5_0 \
        && \
    git clone --depth 1 --branch R_2_6_0 https://github.com/libexpat/libexpat libexpat_2_6_0 \
        && \
    diff -r -u libexpat_2_5_0/expat/lib/ cpython-3-11/Modules/expat/ | tee 2-5-0.diff \
        && \
    diff -r -u libexpat_2_6_0/expat/lib/ cpython-pr/Modules/expat/ | tee 2-6-0.diff \
        && \
    sed -e '/^Only in /d' -e '/^\(+++\|---\) /d' -e '/^diff /d' -i 2-5-0.diff 2-6-0.diff \
        && \
    diff -u 2-5-0.diff 2-6-0.diff \
        && \
    echo 'Diff is good.'