#
# 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";
};

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