#
# 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}" _target_name="${4}" _mirrors="${5:-}"	\
		_rc=0 _target_fname_full="" _url="" _url_base="" _urls_count=0 _urls_full="";
	if [ "${ARG_FETCH_FORCE}" = "offline" ]; then
		return 0;
	else	_urls_full="${_urls}";
		for _url_base in ${_mirrors}; do
			_urls_full="$(rtl_lconcat "${_urls_full}" "${_url_base%/}/${_target_name}/${_target_fname}")";
		done;
		_urls_count="$(rtl_llength "${_urls_full}")";
		for _url in ${_urls_full}; do
			if [ -z "${_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... (from build variables: %s.)"\
							"${_url}" "${_sha256sum_src}";
				else
					rtl_log_msg fatalexit "Error: hash mismatch for URL \`%s' (from build variables: %s.)"\
							"${_url}" "${_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