# Copyright (c) 2022 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 https://github.com/python/cpython cpython-main \
        && \
    ( cd cpython-main && git rev-parse HEAD ) \
        && \
    git clone --depth 1 --branch bpo-46794 https://github.com/corona10/cpython corona10-bpo-46794 \
        && \
    ( cd corona10-bpo-46794 && git rev-parse HEAD ) \
        && \
    git config --global advice.detachedHead false \
        && \
    git clone --depth 1 --branch R_2_4_4 https://github.com/libexpat/libexpat libexpat_2_4_4 \
        && \
    git clone --depth 1 --branch R_2_4_6 https://github.com/libexpat/libexpat libexpat_2_4_6 \
        && \
    diff -r -u libexpat_2_4_4/expat/lib/ cpython-main/Modules/expat/ | tee 2-4-4.diff \
        && \
    diff -r -u libexpat_2_4_6/expat/lib/ corona10-bpo-46794/Modules/expat/ | tee 2-4-6.diff \
        && \
    sed -e '/^Only in /d' -e '/^\(+++\|---\) /d' -e '/^diff /d' -i 2-4-4.diff 2-4-6.diff \
        && \
    diff -u 2-4-4.diff 2-4-6.diff \
        && \
    echo 'Diff is good.'