#!/usr/bin/env bash

# General build dependencies: gawk grep lz4 zstd wget gcc make autoconf
# 	libtool pkgconf libcap fuse2 (or fuse3) lzo xz zlib findutils
#
# Dwarfs build dependencies: fuse2 (or fuse3) openssl jemalloc
# 	xxhash boost lz4 xz zstd libarchive libunwind google-glod gtest fmt
#	gflags double-conversion cmake ruby-ronn libevent libdwarf git
#
# Dwarfs compilation is optional and disabled by default.

script_dir="$(dirname "$(readlink -f "${BASH_SOURCE[0]}")")"

# Set to true to compile dwarfs instead of squashfuse
build_dwarfs="false"

squashfuse_version="0.1.104"
bwrap_version="0.5.0"
lz4_version="1.9.3"
zstd_version="1.5.2"
squashfs_tools_version="4.5"

export CC=gcc
export CXX=g++

export CFLAGS="-msse3 -O2"
export CXXFLAGS="${CFLAGS}"
export LDFLAGS="-Wl,-O1,--sort-common,--as-needed"

mkdir -p "${script_dir}"/build-utils
cd "${script_dir}"/build-utils || exit 1

wget -q --show-progress -O lz4.tar.gz https://github.com/lz4/lz4/archive/refs/tags/v${lz4_version}.tar.gz
wget -q --show-progress -O zstd.tar.gz https://github.com/facebook/zstd/archive/refs/tags/v${zstd_version}.tar.gz
wget -q --show-progress -O bwrap.tar.gz https://github.com/containers/bubblewrap/archive/refs/tags/v${bwrap_version}.tar.gz

tar xf lz4.tar.gz
tar xf zstd.tar.gz
tar xf bwrap.tar.gz

if [ "${build_dwarfs}" != "true" ]; then
	wget -q --show-progress -O squashfuse.tar.gz https://github.com/vasi/squashfuse/archive/refs/tags/${squashfuse_version}.tar.gz
	wget -q --show-progress -O sqfstools.tar.gz https://github.com/plougher/squashfs-tools/archive/refs/tags/${squashfs_tools_version}.tar.gz

	tar xf squashfuse.tar.gz
	tar xf sqfstools.tar.gz
fi

cd bubblewrap-${bwrap_version}
./autogen.sh
./configure --disable-selinux --disable-man
make -j$(nproc) DESTDIR="${script_dir}"/build-utils/bin install

cd ../lz4-${lz4_version}
make -j$(nproc) DESTDIR="${script_dir}"/build-utils/bin install

cd ../zstd-${zstd_version}
ZSTD_LEGACY_SUPPORT=0 HAVE_ZLIB=0 HAVE_LZMA=0 HAVE_LZ4=0 BACKTRACE=0 make -j$(nproc) DESTDIR="${script_dir}"/build-utils/bin install

if [ "${build_dwarfs}" != "true" ]; then
	cd ../squashfuse-${squashfuse_version}
	./autogen.sh
	./configure
	make -j$(nproc) DESTDIR="${script_dir}"/build-utils/bin install

	cd ../squashfs-tools-${squashfs_tools_version}/squashfs-tools
	make -j$(nproc) GZIP_SUPPORT=1 XZ_SUPPORT=1 LZO_SUPPORT=1 LZMA_XZ_SUPPORT=1 \
			LZ4_SUPPORT=1 ZSTD_SUPPORT=1 XATTR_SUPPORT=1
	make INSTALL_DIR="${script_dir}"/build-utils/bin/usr/local/bin install
fi

cd "${script_dir}"/build-utils
mkdir utils
mv bin/usr/local/bin/bwrap utils
mv bin/usr/local/bin/squashfuse utils
mv bin/usr/local/bin/squashfuse_ll utils
mv bin/usr/local/bin/mksquashfs utils
mv bin/usr/local/bin/unsquashfs utils
mv bin/usr/local/lib/liblz4.so.${lz4_version} utils/liblz4.so.1
mv bin/usr/local/lib/libzstd.so.${zstd_version} utils/libzstd.so.1
mv bin/usr/local/lib/libfuseprivate.so.0.0.0 utils/libfuseprivate.so.0
mv bin/usr/local/lib/libsquashfuse.so.0.0.0 utils/libsquashfuse.so.0

if [ ! "$(ldd utils/squashfuse | grep libfuse.so.2)" ]; then
	mv utils/squashfuse utils/squashfuse3
	mv utils/squashfuse_ll utils/squashfuse3_ll
fi

if [ "${build_dwarfs}" = "true" ]; then
	git clone https://github.com/mhx/dwarfs.git --recursive

	mkdir dwarfs/build
	cd dwarfs/build
	cmake .. -DCMAKE_BUILD_TYPE=Release \
			-DPREFER_SYSTEM_ZSTD=ON -DPREFER_SYSTEM_XXHASH=ON \
			-DPREFER_SYSTEM_GTEST=ON

	make -j$(nproc)
	make DESTDIR="${script_dir}"/build-utils/bin install

	cd "${script_dir}"/build-utils
	mv bin/usr/local/sbin/dwarfs2 utils/dwarfs
	mv bin/usr/local/sbin/dwarfs utils/dwarfs3
	mv bin/usr/local/bin/mkdwarfs utils
	mv bin/usr/local/bin/dwarfsextract utils
fi

libs_list="$(ldd utils/* | grep "=> /" | awk '{print $3}' | xargs)"

for i in ${libs_list}; do
	if [ ! -f utils/"$(basename "${i}")" ]; then
		cp -L "${i}" utils
	fi
done

if [ ! -f utils/ld-linux-x86-64.so.2 ]; then
    cp -L /lib64/ld-linux-x86-64.so.2 utils
fi

find utils -type f -exec strip --strip-unneeded {} \; 2>/dev/null

cat <<EOF > utils/info
bubblewrap ${bwrap_version}
lz4 ${lz4_version}
zstd ${zstd_version}
EOF

if [ "${build_dwarfs}" = "true" ]; then
	echo "dwarfs $(git -C dwarfs rev-parse --short HEAD)-git" >> utils/info
	utils="utils_dwarfs.tar.gz"
else
	echo "squashfuse ${squashfuse_version}" >> utils/info
	echo "squashfs-tools ${squashfs_tools_version}" >> utils/info
	utils="utils.tar.gz"
fi

tar -zcf "${utils}" utils
mv "${script_dir}"/"${utils}" "${script_dir}"/"${utils}".old
mv "${utils}" "${script_dir}"
cd "${script_dir}" || exit 1
rm -rf build-utils

clear
echo "Done!"