#

# set +o errexit -o noglob -o nounset is assumed.

#

rtlp_fetch_url_git() {

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

		_oldpwd="";

	(set -o errexit -o noglob -o nounset;

	rtl_flock_acquire 4 || exit "${?}";

	trap "rm -f \"${BUILD_DLCACHEDIR}/${_subdir%%[/]}.fetching\"" EXIT;

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

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

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

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

			git submodule update);

	else

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

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

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

				git checkout "${_branch}");

		fi;

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

			git submodule update --init);

	fi;

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

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

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

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

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

		cd "$(pwd)";

	else

		return 1;

	fi;

};

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;

		rtlp_fetch_url_git "${_tgtdir}" "${_subdir}"	\

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

	done;

};

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

rtl_fetch_url_wget() {

	local _urls="${1}" _sha256sum_src="${2}" _target_fname="${3}" _rc=0 _target_fname_full=""\

		_url="" _urls_count=0 RTL_CHECK_DIGEST_DIGEST="";

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

		return 0;

	else	_urls_count="$(rtl_llength "${_urls}")";

		for _url in ${_urls}; do

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

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

			fi;

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

			(set +o errexit -o noglob -o nounset;

			rtl_flock_acquire 4 || exit 1;

			trap "_rc=\"\${?}\"; rm -f \"${_target_fname_full}.fetching\"; exit \"\${_rc}\";" EXIT;

			if [ -z "${_sha256sum_src}" ]\

			|| ! rtl_check_digest_file "${_target_fname_full}" "${_sha256sum_src}" "${_target_fname_full}.fetched"; then

				wget ${DEFAULT_WGET_ARGS} -O "${_target_fname_full}" "${_url}"; _rc="${?}";

				if [ "${_rc}" -ne 0 ]; then

					exit $((${_rc}+2));

				elif [ -n "${_sha256sum_src}" ]\

				&& ! rtl_check_digest "${_target_fname_full}" "${_sha256sum_src}"; then

					exit 2;

				else

					printf "%s" "${RTL_CHECK_DIGEST_DIGEST}" > "${_target_fname_full}.fetched"; exit 0;

				fi;

			else

				exit 0;

			fi;) 4<>"${_target_fname_full}.fetching"; _rc="${?}"; : $((_urls_count-=1));

			case "${_rc}" in

			0)	break; ;;

			1)	if [ "${_urls_count}" -ge 1 ]; then

					rtl_log_msg warning "Warning: failed to acquire fetching lock for URL \`%s', retrying with alternative URL..." "${_url}";

				else

					rtl_log_msg fatalexit "Error: failed to acquire fetching lock for URL \`%s'." "${_url}";

				fi; ;;

			2)	if [ "${_urls_count}" -ge 1 ]; then

					rtl_log_msg warning "Warning: hash mismatch for URL \`%s', retrying with alternative URL... (downloaded file: %s, from build variables: %s.)"\

							"${_url}" "${RTL_CHECK_DIGEST_DIGEST}" "${_sha256sum_src}";

				else

					rtl_log_msg fatalexit "Error: hash mismatch for URL \`%s' (downloaded file: %s, from build variables: %s.)"\

							"${_url}" "${RTL_CHECK_DIGEST_DIGEST}" "${_sha256sum_src}";

				fi; ;;

			*)	if [ "${_urls_count}" -ge 1 ]; then

					rtl_log_msg warning "Warning: failed to fetch URL \`%s', retrying with alternative URL... (wget(1) exit status: %s)"\

							"${_url}" "$((${_rc}-2))";

				else

					rtl_log_msg fatalexit "Error: failed to fetch URL \`%s' (wget(1) exit status: %s)"\

							"${_url}" "$((${_rc}-2))";

				fi; ;;

			esac;

		done;

		return "${_rc}";

	fi;

};

# vim:filetype=sh