#
# Copyright (c) 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023 Lucía Andrea Illanes Albornoz <lucia@luciaillanes.de>
# set +o errexit -o noglob -o nounset is assumed.
#
#

#
# ex_rtl_build_rpm() - build RPM package
# @_destdir:		package destination directory
# @_jobs_max:		maximum count of simultaneously executing rpmbuild(1) processes
# @_jobs_semaphore:	pathname to current count of simultaneously executing rpmbuild(1) processes semaphore file
# @_jobs_wait:		wait period in seconds when @_jobs_semaphore is locked
# @_name:		package name
# @_rpms_dname:		RPMs directory pathname
# @_spec_fname:		RPM .spec file pathname
# @_spec_fname_tgt:	target package RPM .spec file pathname
# @_tmp_dname:		temporary files directory pathname
# @_topdir:		package top directory
# @_url:		package URL
# @_version:		package version
# @_version_rpm:	package RPM version
#
# Returns:		zero (0) on success, non-zero (>0) on failure
# N.B.:			The following variables are substituted prior to running rpmbuild(1):
#			%{pkg_destdir}
#			%{pkg_name}
#			%{pkg_url}
#			%{pkg_version_full}
#			%{pkg_version_rpm}
#
#			The \n-separated list of package files is inserted after the `%files' line.
#
ex_rtl_build_rpm() {
	local	_erbr_destdir="${1}" _erbr_jobs_max="${2}" _erbr_jobs_semaphore="${3}" _erbr_jobs_wait="${4}"	\
		_erbr_name="${5}" _erbr_rpms_dname="${6}" _erbr_spec_fname="${7}" _erbr_spec_fname_tgt="${8}"	\
		_erbr_tmp_dname="${9}" _erbr_topdir="${10}" _erbr_url="${11}" _erbr_version="${12}"		\
		_erbr_version_rpm="${13}"									\
		_erbr_spec_fname_tgt_tmp="" _erbr_job_count=0 _erbr_rc=0 _erbr_rc_jobs=0;

(
	while true; do
		(set +o errexit -o noglob -o nounset;
		rtl_flock_acquire 4 || exit $((${?} + 1));

		read _erbr_job_count <&4;
		if [ "${_erbr_job_count:+1}" != 1 ]; then
			_erbr_job_count=0;
		fi;

		if [ "${_erbr_job_count}" -ge "${_erbr_jobs_max}" ]; then
			exit 1;
		else
			: $((_erbr_job_count += 1));
			printf "%s" "${_erbr_job_count}" >"${_erbr_jobs_semaphore}" || exit $((${?} + 1));
			exit 0;
		fi) 4<>"${_erbr_jobs_semaphore}";
		_erbr_rc_jobs="${?}";

		case "${_erbr_rc_jobs}" in
		0)	break; ;;
		1)	sleep "${_erbr_jobs_wait}" || return "${?}"; ;;
		*)	return $((${_erbr_rc_jobs} - 1));
		esac;
	done;

	trap '
		(set +o errexit -o noglob -o nounset;
		rtl_flock_acquire 4 || exit 1;

		read _erbr_job_count <&4;
		if [ "${_erbr_job_count:+1}" != 1 ]\
		|| [ "${_erbr_job_count}" -lt 1 ]; then
			_erbr_job_count=1;
		fi;

		: $((_erbr_job_count -= 1));
		printf "%s" "${_erbr_job_count}" >"${_erbr_jobs_semaphore}" || exit 1;
		exit 0) 4<>"${_erbr_jobs_semaphore}"'	\
		EXIT HUP INT TERM USR1 USR2;

	(
	_erbr_spec_fname_tgt_tmp="${_erbr_spec_fname_tgt}.tmp";
	trap "rm -f \"${_erbr_spec_fname_tgt_tmp}\"" EXIT HUP INT TERM USR1 USR2;

	#
	# N.B.	Keep list in sync w/ list in function documentation comment block at top.
	#
	if rtl_fileop cp "${_erbr_spec_fname}" "${_erbr_spec_fname_tgt_tmp}"	\
	&& sed	-i""								\
			-ne '/^#REMOVEDBYSED#/!p'				\
			"${_erbr_spec_fname_tgt_tmp}"				\
	&& sed	-i""								\
			-e 's#%{pkg_destdir}#'"${_erbr_destdir}"'#g'		\
			-e 's#%{pkg_name}#'"${_erbr_name}"'#g'			\
			-e 's#%{pkg_url}#'"${_erbr_url}"'#g'			\
			-e 's#%{pkg_version_full}#'"${_erbr_version}"'#g'	\
			-e 's#%{pkg_version_rpm}#'"${_erbr_version_rpm}"'#g'	\
			"${_erbr_spec_fname_tgt_tmp}"				\
	&& sed	-n -e '1,/^%files$/p'						\
			"${_erbr_spec_fname_tgt_tmp}"				\
			> "${_erbr_spec_fname_tgt}"				\
	&& (cd "${_erbr_destdir}";						\
	    find -mindepth 1 \( -type f -or -type l \) |			\
	    sed	-e 's,^./,'"/"','						\
	    	-e 's/^/"/'							\
		-e 's/$/"/')							\
	    		>> "${_erbr_spec_fname_tgt}"				\
	&& sed	-n -e '/^%files$/,${/^%files$/d;p}'				\
			"${_erbr_spec_fname_tgt_tmp}"				\
			>> "${_erbr_spec_fname_tgt}"				\
		;								\
	then
		_erbr_rc=0;
	else
		_erbr_rc=1;
	fi;
	exit "${_erbr_rc}";
	); _erbr_rc="${?}";

	if [ "${_erbr_rc}" -eq 0 ]; then
		while true; do
			rpmbuild						\
				-bb						\
				--define "_binary_payload w2T16.xzdio"		\
				--define="_tmppath ${_erbr_tmp_dname=}"		\
				--define="_topdir ${_erbr_topdir}"		\
				--nodeps					\
				"${_erbr_spec_fname_tgt}";
			_erbr_rc="${?}";

			if [ "${_erbr_rc}" -eq 141 ]; then
				_erbr_rc=0; continue;
			else
				break;
			fi;
		done;

		if [ "${_erbr_rc}" -eq 0 ]; then
			if ! find "${_erbr_rpms_dname}/${_erbr_name}-${_erbr_version_rpm}/RPMS"		\
				-iname \*.rpm -exec cp -pP {} "${_erbr_rpms_dname}/" \;			\
			|| ! rtl_fileop rm "${_erbr_rpms_dname}/${_erbr_name}-${_erbr_version_rpm}"	\
			|| ! rtl_fileop cp "${_erbr_spec_fname_tgt}" "${_erbr_rpms_dname}/";
			then
				_erbr_rc=1;
			fi;
		fi;
	fi;

	exit "${_erbr_rc}";
);
	_erbr_rc="${?}";

	return "${_erbr_rc}";
};

#
# ex_rtl_expand_rpm_version() - expand RPM version strings
# @_rurl:		out reference to package URL
# @_rversion:		out reference to package version
# @_rversion_rpm:	out reference to RPM version string
# @_subdir:		package subdirectory
# @_url:		package URL
# @_url_censor:		package URL filter
# @_urls_git:		package Git URL(s)
# @_version:		package version
#
# Returns:		zero (0) on success, non-zero (>0) on failure
#
ex_rtl_expand_rpm_version() {
	local	_ererv_rurl="${1#\$}" _ererv_rversion="${2#\$}" _ererv_rversion_rpm="${3#\$}"	\
		_ererv_subdir="${4}" _ererv_url="${5}" _ererv_url_censor="${6}"			\
		_ererv_urls_git="${7}" _ererv_version="${8}"					\
		_ererv_version_full="" _ererv_version_rpm=""

	if [ "${_ererv_url:+1}" = 1 ]; then
		_ererv_url="${_ererv_url%% *}";
		_ererv_version_full="${_ererv_version}";
		_ererv_version_rpm="${_ererv_version%%-*}";

	elif [ "${_ererv_urls_git:+1}" = 1 ]; then
		_ererv_url="${_ererv_urls_git%% *}";
		_ererv_url="${_ererv_url##*=}";
		_ererv_url="${_ererv_url%%@*}";

		_ererv_version_rpm="$(cd "${_ererv_subdir}" && git rev-parse HEAD)" || return 1;
		_ererv_version_full="${_ererv_version_rpm} ($(cd "${_ererv_subdir}" && git rev-parse --abbrev-ref HEAD))" || return 1;
	fi;

	if [ "${_ererv_url#${_ererv_url_censor}}" != "${_ererv_url}" ]; then
		_ererv_url="Unknown";
	fi;

	eval ${_ererv_rurl}='${_ererv_url}';
	eval ${_ererv_rversion}='${_ererv_version_full}';
	eval ${_ererv_rversion_rpm}='${_ererv_version_rpm}';

	return 0;
};

#
# ex_rtl_fixup_pkgconfig_paths() - fixup pathname prefixes in pkg-config(1) files
# @_dname_base:		base directory pathname
#
# Returns:		zero (0) on success, non-zero (>0) on failure
#
ex_rtl_fixup_pkgconfig_paths() {
	local	_erfpp_dname_base="${1}"	\
		_erfpp_pc_path="";

	for _erfpp_pc_path in $(find "${_erfpp_dname_base=}" -name \*.pc); do
		if [ -n "$(sed -ne '/^libdir=[^$]*$/p' "${_erfpp_pc_path}")" ]			\
		&& ! sed -i""	-e '/^libdir=[^$]*$/s/^libdir=\(.*\)$/libdir=${exec_prefix}\1/'	\
				-e '/^exec_prefix=$/s/^.*$/exec_prefix=${prefix}/'		\
				"${_erfpp_pc_path}";
		then
			return 1;
		fi;

		if [ -n "$(sed -ne '/^includedir=[^$]*$/p' "${_erfpp_pc_path}")" ]			\
		&& ! sed -i""	-e '/^includedir=[^$]*$/s/^includedir=\(.*\)$/includedir=${prefix}\1/'	\
				"${_erfpp_pc_path}";
		then
			return 1;
		fi;
	done;

	return 0;
};

#
# ex_rtl_strip_files() - strip files of debugging information
# @_strip_cmd:		strip(1) command name
# @_tree_root:		pathname to tree root
# @--:			(ignored)
# @_log_fn:		logging function name; called with @... and pathname of each file stripped
# @...:			@_fn initial arguments list as positional parameters
#
# Returns:		zero (0) on success, non-zero (>0) on failure
#
ex_rtl_strip_files() {
	local	_ersf_strip_cmd="${1}" _ersf_tree_root="${2}"	\
		_ersf_ignored="${3}" _ersf_log_fn="${4}"	\
		_ersf_bin_path="";
	shift 4;

	if [ -e "${_ersf_tree_root}" ]; then
		for _ersf_bin_path in $(find		\
				"${_ersf_tree_root}"	\
				-perm /a=x		\
				-type f);
		do
			if objdump				\
					-sj .debug_frame	\
					-j .debug_info		\
					"${_ersf_bin_path}"	\
					>/dev/null 2>&1;
			then
				if ! "${_ersf_strip_cmd}" "${_ersf_bin_path}"; then
					return 1;
				else
					"${_ersf_log_fn}" "${@}" "${_ersf_bin_path}";
				fi;
			fi;
		done;
	fi;

	return 0;
};

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