#!/bin/bash -eu
# Copyright 2019 Google Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
################################################################################

# Ignore memory leaks from python scripts invoked in the build
export ASAN_OPTIONS="detect_leaks=0"
export MSAN_OPTIONS="halt_on_error=0:exitcode=0:report_umrs=0"

# Remove -pthread from CFLAGS, this trips up ./configure
# which thinks pthreads are available without any CLI flags
CFLAGS=${CFLAGS//"-pthread"/}

FLAGS=()
case $SANITIZER in
  address)
    FLAGS+=("--with-address-sanitizer")
    ;;
  memory)
    FLAGS+=("--with-memory-sanitizer")
    # installing ensurepip takes a while with MSAN instrumentation, so
    # we disable it here
    FLAGS+=("--without-ensurepip")
    # -msan-keep-going is needed to allow MSAN's halt_on_error to function
    FLAGS+=("CFLAGS=-mllvm -msan-keep-going=1")
    ;;
  undefined)
    FLAGS+=("--with-undefined-behavior-sanitizer")
    ;;
esac

export CPYTHON_INSTALL_PATH=$SRC/cpython-install
rm -rf $CPYTHON_INSTALL_PATH
mkdir $CPYTHON_INSTALL_PATH

tar zxf v3.8.7.tar.gz
cd cpython-3.8.7/
cp $SRC/django-fuzzers/python_coverage.h Python/

# Patch the interpreter to record code coverage
sed -i '1 s/^.*$/#include "python_coverage.h"/g' Python/ceval.c
sed -i 's/case TARGET\(.*\): {/\0\nfuzzer_record_code_coverage(f->f_code, f->f_lasti);/g' Python/ceval.c

./configure "${FLAGS[@]:-}" --prefix=$CPYTHON_INSTALL_PATH
make -j$(nproc)
make install

cp -R $CPYTHON_INSTALL_PATH $OUT/

rm -rf $OUT/django-dependencies
mkdir $OUT/django-dependencies
$CPYTHON_INSTALL_PATH/bin/pip3 install asgiref pytz sqlparse backports.zoneinfo -t $OUT/django-dependencies

cd $SRC/django-fuzzers
rm $CPYTHON_INSTALL_PATH/lib/python3.8/lib-dynload/_tkinter*.so
make

cp -R $SRC/django/* $OUT/

cp $SRC/django-fuzzers/fuzzer-utils $OUT/
cp $SRC/django-fuzzers/utils.py $OUT/
zip -j $OUT/fuzzer-utils_seed_corpus.zip $SRC/django-fuzzers/corp-utils/*