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

# N.B.	URLs ($1) may contain `?' or '&' characters.
rtl_fetch_url_wget() {
	local _urls="${1}" _sha256sum_src="${2}" _target_dname="${3}" _target_fname="${4}" _target_name="${5}" _mirrors="${6:-}"\
		_rc=0 _sha256sum_target="" _target_fname_full="" _url="" _url_base="" _urls_count=0 _urls_full="";

	_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="${_target_dname}/${_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 [ "${_urls_count}" -ge 1 ]; then
				rtl_log_msg "warning" "${MSG_rtl_fetch_lockfail_retryurl}" "${_url}";
			else
				rtl_log_msg "fatal" "${MSG_rtl_fetch_lockfail}" "${_url}";
				rtl_fileop rm "${_target_fname_full}"; break;
			fi; ;;
		2)	if [ "${_urls_count}" -ge 1 ]; then
				rtl_log_msg "warning" "${MSG_rtl_fetch_hashfail_retryurl}" "${_url}" "${_sha256sum_src}";
			else
				if _sha256sum_target="$(sha256sum "${_target_fname_full}" |\
							awk '{print $1}' 2>/dev/null)"; then
					rtl_log_msg "fatal" "${MSG_rtl_fetch_hashfail1}" "${_url}" "${_sha256sum_src}" "${_sha256sum_target}";
				else
					rtl_log_msg "fatal" "${MSG_rtl_fetch_hashfail2}" "${_url}" "${_sha256sum_src}";
				fi;
				rtl_fileop rm "${_target_fname_full}"; break;
			fi; ;;
		*)	if [ "${_urls_count}" -ge 1 ]; then
				rtl_log_msg "warning" "${MSG_rtl_fetch_fail_retryurl}" "${_url}" "$((${_rc}-2))";
			else
				rtl_log_msg "fatal" "${MSG_rtl_fetch_fail}" "${_url}" "$((${_rc}-2))";
				rtl_fileop rm "${_target_fname_full}"; break;
			fi; ;;
		esac;
	done;
	return "${_rc}";
};

# vim:filetype=sh