#

# set +o errexit -o noglob is assumed.

#

exp_rtl_fetch_url_git() {

	local _tgtdir="${1}" _subdir="${2}" _url="${3}" _branch="${4}"	\

		_oldpwd="";

	(set -o errexit -o noglob; trap "rm -f \"${BUILD_DLCACHEDIR}/${_subdir%%[/]}.fetching\"" EXIT;

	while true; do

		if flock -E 622 -w 3600 4; then

			break;

		elif [ "${?}" -eq 622 ]; then

			continue;

		else

			exit "${?}";

		fi;

	done;

	if [ -e "${BUILD_DLCACHEDIR}/${_subdir}" ]; then

		(ex_rtl_fileop cd "${BUILD_DLCACHEDIR}/${_subdir}" &&\

			git pull ${DEFAULT_GIT_ARGS} origin "${_branch:-main}");

		(ex_rtl_fileop cd "${BUILD_DLCACHEDIR}/${_subdir}" &&\

			git submodule update);

	else

		git clone ${DEFAULT_GIT_ARGS} "${_url}" "${BUILD_DLCACHEDIR}/${_subdir}";

		if [ -n "${_branch}" ]; then

			(ex_rtl_fileop cd "${BUILD_DLCACHEDIR}/${_subdir}" &&\

				git checkout "${_branch}");

		fi;

		(ex_rtl_fileop cd "${BUILD_DLCACHEDIR}/${_subdir}" &&\

			git submodule update --init);

	fi;

	_oldpwd="${PWD}"; ex_rtl_fileop cd "${PKG_BASE_DIR}";

	ex_rtl_fileop rm "${_tgtdir}/${_subdir}";

	ex_rtl_fileop cp "${BUILD_DLCACHEDIR}/${_subdir}" "${_tgtdir}";

	ex_rtl_fileop cd "${_oldpwd}";) 4<>"${BUILD_DLCACHEDIR}/${_subdir%%[/]}.fetching";

	if [ "${?}" -eq 0 ]; then

		cd "$(pwd)";

	else

		return "${?}";

	fi;

};

ex_rtl_fetch_urls_git() {

	local _tgtdir="" _url_spec="" _subdir="" _url="" _git_branch="";

	_tgtdir="${1}"; shift;

	if [ "${ARG_FETCH_FORCE}" = "offline" ]; then

		return 0;

	fi;

	for _url_spec in "${@}"; do

		_subdir="${_url_spec%=*}";

		_url="${_url_spec#*=}";

		_url="${_url%@*}";

		if [ "${_url_spec#*@}" != "${_url_spec}" ]; then

			_git_branch=${_url_spec#*@};

		fi;

		exp_rtl_fetch_url_git "${_tgtdir}" "${_subdir}"	\

			"${_url}" "${_git_branch}";

	done;

};

# N.B.	URLs ($1) may contain `?' or '&' characters.

ex_rtl_fetch_url_wget() {

	local _url="${1}" _sha256sum_src="${2}" _target_fname="${3}" _sha256sum_dst="";

	if [ "${ARG_FETCH_FORCE}" = "offline" ]; then

		return 0;

	elif [ -z "${_target_fname}" ]; then

		_target_fname="$(ex_rtl_basename "${_url}")";

	fi;

	_url_dst="${BUILD_DLCACHEDIR}/${_target_fname}";

	(set -o errexit -o noglob; trap "_rc=\"\${?}\" ;rm -f \"${_url_dst}.fetching\"; exit \"\${_rc}\";" EXIT;

	while true; do

		if flock -E 622 -w 3600 4; then

			break;

		elif [ "${?}" -eq 622 ]; then

			continue;

		else

			exit "${?}";

		fi;

	done;

	if [ ! -e "${_url_dst}.fetched" ]; then

		wget ${DEFAULT_WGET_ARGS} -O "${_url_dst}" "${_url}";

		if [ -n "${_sha256sum_src}" ]; then

			set -- $(sha256sum "${_url_dst}");

			if [ "${_sha256sum_dst:=${1}}" != "${_sha256sum_src}" ]; then

				ex_rtl_log_msg failexit "Error: hash mismatch for URL \`${_url}' (downloaded file: ${_sha256sum_dst}, from build variables: ${_sha256sum_src}.)";

			fi;

		fi;

		ex_rtl_fileop touch "${_url_dst}.fetched";

	fi;) 4<>"${_url_dst}.fetching";

};

# vim:filetype=sh