#!/bin/sh -eu

# First step: In the top directory execute
# export CC=clang-5.0
# export CFLAGS="-O1 -fno-omit-frame-pointer -gline-tables-only -DFUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION -fsanitize=address -fsanitize-address-use-after-scope -fsanitize-coverage=trace-pc-guard,trace-cmp"
# ./configure --enable-static --disable-gtk-doc --enable-runtime=libidn2 --enable-builtin=libidn2
# make clean
# make -j$(nproc) LIB_FUZZING_ENGINE="-lFuzzer"
# cd fuzz
# make -j$(nproc) check

# 
# Read the docs at https://github.com/google/oss-fuzz/blob/master/docs/corpora.md
# then install 'google-cloud-sdk' and execute 'gcloud init'.
# Now 'gsutil' should be ready to use.

if test -z "$1"; then
  echo "Usage: $0 <fuzzer target>"
  echo "Example: $0 libpsl_fuzzer"
  exit 1
fi

fuzzer=$1
project=$(echo $1 | cut -d'_' -f1)

# sync/copy the OSS-Fuzz corpora into the .new directory
mkdir -p ${fuzzer}.new
cp -p ${fuzzer}.in/* ${fuzzer}.new
gsutil -m rsync gs://${project}-corpus.clusterfuzz-external.appspot.com/libFuzzer/${fuzzer} ${fuzzer}.new

# create fuzzer target
BUILD_ONLY=1 ./run-clang.sh ${fuzzer}

# merge the corpora into the .in directory
./${fuzzer} -merge=1 ${fuzzer}.in ${fuzzer}.new

# now clear .new dir and put all corpora there
rm -f ${fuzzer}.new/*
mv ${fuzzer}.in/* ${fuzzer}.new

# now merge again (optimizes number of corpora)
./${fuzzer} -merge=1 ${fuzzer}.in ${fuzzer}.new

echo
echo "If new files have been added, 'git add' and 'git commit' them."