#

# set -o noglob is assumed.

#

exp_rtl_fetch_url_git() {

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

		_oldpwd;

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

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

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

	else

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

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

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

				git checkout "${_branch}");

		fi;

	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}";

};

ex_rtl_fetch_urls_git() {

	local _tgtdir _url_spec _subdir _url _git_branch;

	_tgtdir="${1}"; shift;

	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}" _sha256sum_dst="";

	if [ -z "${3}" ]; then

		_url_dst="${BUILD_DLCACHEDIR}/$(ex_rtl_basename "${_url}")";

	else

		_url_dst="${BUILD_DLCACHEDIR}/${3}";

	fi;

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

		return 0;

	else

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

	fi;

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

		set -- $(openssl dgst -sha256 "${_url_dst}"); shift $((${#}-1));

		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;

	touch "${_url_dst}.fetched";

};

# vim:filetype=sh