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#
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# set +o errexit -o noglob -o nounset is assumed.
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#
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# N.B.	URLs ($1) may contain `?' or '&' characters.
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rtl_fetch_url_wget() {
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	local	_rfuw_urls="${1}" _rfuw_sha256sum_src="${2}" _rfuw_target_dname="${3}"		\
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		_rfuw_target_fname="${4}" _rfuw_target_name="${5}" _rfuw_mirrors="${6:-}"	\
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		_rfuw_rc=0 _rfuw_sha256sum_target="" _rfuw_target_fname_full="" _rfuw_url=""	\
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		_rfuw_url_base="" _rfuw_urls_count=0 _rfuw_urls_full="";
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	_rfuw_urls_full="${_rfuw_urls}";
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	for _rfuw_url_base in ${_rfuw_mirrors}; do
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		rtl_lconcat \$_rfuw_urls_full "${_rfuw_url_base%/}/${_rfuw_target_name}/${_rfuw_target_fname}";
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	done;
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	rtl_llength \$_rfuw_urls_count \$_rfuw_urls_full;
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	for _rfuw_url in ${_rfuw_urls_full}; do
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		if [ "${_rfuw_target_fname:+1}" != 1 ]; then
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			rtl_basename2 \$_rfuw_url \$_rfuw_target_fname;
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		fi;
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		_rfuw_target_fname_full="${_rfuw_target_dname}/${_rfuw_target_fname}";
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		(set +o errexit -o noglob -o nounset;
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		rtl_flock_acquire 4 || exit 1;
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		trap "_rfuw_rc=\"\${?}\"; rm -f \"${_rfuw_target_fname_full}.fetching\"; exit \"\${_rfuw_rc}\";" EXIT;
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		if [ "${_rfuw_sha256sum_src:+1}" != 1 ]\
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		|| ! rtl_check_digest_file "${_rfuw_target_fname_full}" "${_rfuw_sha256sum_src}" "${_rfuw_target_fname_full}.fetched"; then
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			wget ${DEFAULT_WGET_ARGS} -O "${_rfuw_target_fname_full}" "${_rfuw_url}"; _rfuw_rc="${?}";
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			if [ "${_rfuw_rc}" -ne 0 ]; then
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				exit $((${_rfuw_rc}+2));
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			elif [ "${_rfuw_sha256sum_src:+1}" = 1 ]\
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			&& ! rtl_check_digest \$_digest "${_rfuw_target_fname_full}" "${_rfuw_sha256sum_src}"; then
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				exit 2;
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			else
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				printf "%s" "${_digest}" > "${_rfuw_target_fname_full}.fetched"; exit 0;
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			fi;
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		else
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			exit 0;
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		fi;) 4<>"${_rfuw_target_fname_full}.fetching"; _rfuw_rc="${?}"; : $((_rfuw_urls_count-=1));
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		case "${_rfuw_rc}" in
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		0)	break; ;;
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		1)	if [ "${_rfuw_urls_count}" -ge 1 ]; then
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				rtl_log_msg "warning" "${MSG_rtl_fetch_lockfail_retryurl}" "${_rfuw_url}";
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			else
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				rtl_log_msg "fatal" "${MSG_rtl_fetch_lockfail}" "${_rfuw_url}";
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				rtl_fileop rm "${_rfuw_target_fname_full}"; break;
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			fi; ;;
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		2)	if [ "${_rfuw_urls_count}" -ge 1 ]; then
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				rtl_log_msg "warning" "${MSG_rtl_fetch_hashfail_retryurl}" "${_rfuw_url}" "${_rfuw_sha256sum_src}";
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			else
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				if _rfuw_sha256sum_target="$(sha256sum "${_rfuw_target_fname_full}" |\
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							awk '{print $1}' 2>/dev/null)"; then
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					rtl_log_msg "fatal" "${MSG_rtl_fetch_hashfail1}" "${_rfuw_url}" "${_rfuw_sha256sum_src}" "${_rfuw_sha256sum_target}";
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				else
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					rtl_log_msg "fatal" "${MSG_rtl_fetch_hashfail2}" "${_rfuw_url}" "${_rfuw_sha256sum_src}";
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				fi;
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				rtl_fileop rm "${_rfuw_target_fname_full}"; break;
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			fi; ;;
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		*)	if [ "${_rfuw_urls_count}" -ge 1 ]; then
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				rtl_log_msg "warning" "${MSG_rtl_fetch_fail_retryurl}" "${_rfuw_url}" "$((${_rfuw_rc}-2))";
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			else
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				rtl_log_msg "fatal" "${MSG_rtl_fetch_fail}" "${_rfuw_url}" "$((${_rfuw_rc}-2))";
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				rtl_fileop rm "${_rfuw_target_fname_full}"; break;
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			fi; ;;
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		esac;
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	done;
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	return "${_rfuw_rc}";
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};
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# vim:filetype=sh textwidth=0