A modern and complete qbitorrent build script.

qbittorrent.sh

#! /usr/bin/env bash
#
# shellcheck disable=SC1091,SC2034 # sourced files
#
set -a
#
export DEBIAN_FRONTEND="noninteractive" TZ="Europe/London"
#
cr="\e[31m"  # [c]olor[r]ed
cg="\e[32m"  # [c]olor[g]reen
cend="\e[0m" # [c]olor[end]
#
build_dir="$HOME/qbit"
qbit_install_dir="${build_dir}/local"
mkdir -p "${build_dir}"
#
boost_version_1="1.75.0"
boost_version_2="boost_${boost_version_1//\./_}"
#
lt_prefix="${build_dir}/local"
#
BOOST_ROOT="${build_dir}/${boost_version_2}"
BOOST_INCLUDEDIR="${BOOST_ROOT}/boost"
BOOST_BUILD_PATH="${BOOST_ROOT}"
#
QT_PREFIX="${build_dir}/local"
QT_QMAKE="${QT_PREFIX}/bin"
#
QBT_VERSION="$(git ls-remote -t --refs https://github.com/qbittorrent/qBittorrent.git | awk '{sub("refs/tags/release-", "");sub("(.*)(rc|alpha|beta)(.*)", ""); print $2 }' | awk '!/^$/' | sort -rV | head -n1)"
qt_tags="$(git ls-remote -t --refs https://github.com/qt/qtbase.git | awk '{sub("refs/tags/", "");sub("(.*)(v6|rc|alpha|beta|-)(.*)", ""); print $2 }' | awk '!/^$/' | sort -rV)"
#
deps() {
	apt-get update
	#
	echo
	qb_required_pkgs=("ca-certificates" "curl" "build-essential" "pkg-config" "git" "zlib1g-dev" "libicu-dev" "libssl-dev" "python3" "python3-dev")
	for pkg in "${qb_required_pkgs[@]}"; do
		pkgman() { dpkg -s "${pkg}"; }
		if pkgman > /dev/null 2>&1; then
			echo -e "Dependency - ${cg}OK${cend} - ${pkg}"
		else
			echo -e "Dependency - ${cr}NO${cend} - ${pkg}"
			qb_checked_required_pkgs+=("$pkg")
		fi
	done
	echo
	if [[ ${#qb_checked_required_pkgs[@]} -eq 0 ]]; then
		echo "All deps installed"
	else
		if ! apt-get -y install --no-install-recommends "${qb_checked_required_pkgs[@]}"; then
			exit
		fi
	fi
	echo
	#
	if [[ "$1" == 'deps' ]]; then exit; fi
}

boost() {
	cd "${build_dir}" || exit
	curl -sL "https://dl.bintray.com/boostorg/release/${boost_version_1}/source/${boost_version_2}.tar.gz" -o "${boost_version_2}.tar.gz"
	tar xf "${boost_version_2}.tar.gz"
	cd "${boost_version_2}" || exit
	./bootstrap.sh
}

libtorrent() {
	python_major="$(python3 -c "import sys; print(sys.version_info[0])")"
	python_minor="$(python3 -c "import sys; print(sys.version_info[1])")"
	python_short_version="${python_major}.${python_minor}"
	#
	echo -e "using gcc : : : <cflags>-march=native -std=c++17 <cxxflags>-march=native -std=c++17 ;\nusing python : ${python_short_version} : /usr/bin/python${python_short_version} : /usr/include/python${python_short_version} : /usr/lib/python${python_short_version} ;" > "/root/user-config.jam"
	cd "${build_dir}" || exit
	[[ -d libtorrent ]] && rm -rf libtorrent
	git clone --single-branch --branch RC_1_2 --shallow-submodules --recurse-submodules --depth 1 https://github.com/arvidn/libtorrent
	#
	# libtorrent
	cd "${build_dir}/libtorrent" || exit
	"${BOOST_ROOT}/b2" -j"$(nproc)" optimization=speed crypto=openssl cxxstd=17 variant=release threading=multi link=static boost-link=static install --prefix="${lt_prefix}"
	#
	# libtorrent python binding
	cd "${build_dir}/libtorrent/bindings/python" || exit
	"${BOOST_ROOT}/b2" -j"$(nproc)" fpic=on optimization=speed crypto=openssl cxxstd=17 variant=release threading=multi libtorrent-link=static boost-link=static install_module python-install-scope=user
}

qt() {
	cd "${build_dir}" || exit
	[[ "$(source /etc/os-release && printf "%s" "${VERSION_CODENAME}")" = 'stretch' ]] && QT_VERSION=$(grep -Eom1 "v5.12.([0-9]{1,2})" <<< ${qt_tags}) || QT_VERSION=$(grep -Eom1 "v5.15.([0-9]{1,2})" <<< ${qt_tags})
	SKIP_QT=False
	if [[ -f ${QT_PREFIX}/lib/libQt5Core.so ]]; then
		if strings "${QT_PREFIX}/lib/libQt5Core.so" |& grep -E ^"${QT_VERSION#v}"$ &> /dev/null; then
			SKIP_QT=True
		fi
	fi
	if [[ $SKIP_QT == False ]]; then
		[[ -d qtbase ]] && rm -rf qtbase
		git clone --single-branch --branch "${QT_VERSION}" --shallow-submodules --recurse-submodules --depth 1 https://github.com/qt/qtbase
		cd qtbase || exit
		./configure --prefix="${QT_PREFIX}" -opensource -confirm-license -openssl-linked -c++std c++17 -release -qt-pcre -no-iconv -no-feature-glib -no-feature-opengl -no-feature-dbus -no-feature-gui -no-feature-widgets -no-feature-testlib -no-compile-examples
		make -j"$(nproc)"
		make install
		rm -rf qtbase

		cd "${build_dir}" || exit
		[[ -d qttools ]] && rm -rf qttools
		git clone -b "${QT_VERSION}" --recurse-submodules https://github.com/qt/qttools
		cd qttools || exit
		"${QT_PREFIX}/bin/qmake" -set prefix "${QT_PREFIX}"
		"${QT_PREFIX}/bin/qmake"
		make -j"$(nproc)"
		make install
		cd "${build_dir}" || exit
		rm -rf qttools
	fi
}

qbittorrent() {
	cd "${build_dir}" || exit
	[[ -d qBittorrent ]] && rm -rf qBittorrent
	git clone --single-branch --branch "release-${QBT_VERSION}" --shallow-submodules --recurse-submodules --depth 1 https://github.com/qbittorrent/qBittorrent
	cd "${build_dir}/qBittorrent" || exit
	#
	[[ "${1}" == 'bug' ]] && CXXFLAGS="" || CXXFLAGS="-I${BOOST_ROOT}"
	#
	./configure --prefix="${qbit_install_dir}" "$BUG" --with-boost="${BOOST_ROOT}" --with-boost-libdir="${lt_prefix}/lib" LDFLAGS="-Wl,--no-as-needed" CXXFLAGS="-std=c++17 -march=native" libtorrent_LIBS="-L${lt_prefix}/lib -l:libtorrent.a" libtorrent_CFLAGS="-I${lt_prefix}/include" --disable-gui
	make -j"$(nproc)"
	make install
	cd "${build_dir}" || exit
}

deps "${@}"
boost
libtorrent
qt
qbittorrent "${@}"