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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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#
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# ex_pkg_check_depends() - check single named package for unsatisfied dependencies
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# @_checkfl:		enable (1) or inhibit (0) dependency expansion
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# @_pkg_disabled:	list of disabled packages
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# @_pkg_finished:	list of finished packages
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# @_pkg_name:		single package name
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# @_pkg_wait:		list of in-progress packages
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#
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# Return:		zero (0) given no outstanding dependencies, non-zero (>0) otherwise
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#
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ex_pkg_check_depends() {
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	local	_checkfl="${1}" _pkg_disabled="${2}" _pkg_finished="${3}" _pkg_name="${4}" _pkg_wait="${5}"\
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		_dependfl=0 _pkg_depends="" _pkg_name_depend="";
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	if [ "${_checkfl:-0}" -eq 1 ]\
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	&& _pkg_depends="$(rtl_uniq $(rtl_lunfold_depends 'PKG_${_name}_DEPENDS' $(rtl_get_var_unsafe -u "PKG_"${_pkg_name}"_DEPENDS")))"; then
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		for _pkg_name_depend in $(rtl_uniq ${_pkg_depends}); do
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			if ! rtl_lmatch "${_pkg_disabled}" "${_pkg_name_depend}"\
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			&& ! rtl_lmatch "${_pkg_finished}" "${_pkg_name_depend}"; then
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				_dependfl=1; break;
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			elif rtl_lmatch "${_pkg_wait}" "${_pkg_name_depend}"; then
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				_dependfl=1; break;
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			fi;
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		done;
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	fi;
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	return "${_dependfl}";
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};
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#
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# ex_pkg_find_package() - find build group a single named package belongs to
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# @_group_names:	build group names
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# @_pkg_name:		single named package
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#
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# Return:		zero (0) on success, non-zero (>0) if package not found, group name on stdout if package was found.
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#
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ex_pkg_find_package() {
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	local _group_names="${1}" _pkg_name="${2}" _foundfl=0 _group_name="" _pkg_names="";
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	for _group_name in ${_group_names}; do
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		if _pkg_names="$(rtl_get_var_unsafe -u "${_group_name}_PACKAGES")"\
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		&& [ -n "${_pkg_names}" ]\
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		&& rtl_lmatch "${_pkg_names}" "${_pkg_name}"; then
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			_foundfl=1; break;
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		fi;
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	done;
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	case "${_foundfl:-0}" in
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	0)	return 1; ;;
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	1)	printf "%s" "${_group_name}"; return 0; ;;
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	esac;
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};
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#
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# ex_pkg_get_packages() - get list of packages belonging to single named build group
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# @_group_name:	build group name
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#
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# Return:	zero (0) on success, non-zero (>0) on failure, list of package names on stdout on success.
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#
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ex_pkg_get_packages() {
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	local _group_name="${1}" _pkg_names="";
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	if _pkg_names="$(rtl_get_var_unsafe -u "${_group_name}_PACKAGES")"\
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	&& [ -n "${_pkg_names}" ]; then
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		printf "%s" "${_pkg_names}"; return 0;
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	else
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		return 1;
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	fi;
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};
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#
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# ex_pkg_load_dump() - load package dump
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# @_pkg_name:	package name
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#
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# Return:	zero (0) on success, non-zero (>0) on failure, package dump post-return on success.
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#
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ex_pkg_load_dump() {
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	local _pkg_name="${1}" _workdir="${2}" _rc=0; _status="";
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	if [ ! -e "${_workdir}/${_pkg_name}.dump" ]; then
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		rtl_log_msg warning "Warning: failed to locate environment dump for package \`%s' in \`%s'." "${_pkg_name}" "${_workdir}";
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		rtl_log_msg info "Rebuilding package \`%s' w/ --dump-in _build..." "${_pkg_name}";
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		(export	ARCH BUILD_KIND BUILD_DLCACHEDIR BUILD_WORKDIR		\
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			PREFIX PREFIX_CROSS PREFIX_MINGW32 PREFIX_MINIPIX	\
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			PREFIX_NATIVE PREFIX_ROOT PREFIX_RPM;
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		./build.sh --dump-in _build -P -r "${_pkg_name}" -v);
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		if [ ! -e "${_workdir}/${_pkg_name}.dump" ]; then
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			_rc=1; _status="Error: failed to locate environment dump for package \`${_pkg_name}' in \`${_workdir}'.";
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		fi;
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	else
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		_rc=0;
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	fi;
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	if [ "${_rc:-0}" -eq 0 ]\
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	&& ! . "${_workdir}/${_pkg_name}.dump"; then
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		_rc=1; _status="Error: failed to source environment dump for package \`${_pkg_name}' from \`${_workdir}'.";
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	elif [ "${_rc:-0}" -eq 0 ]\
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	&&   ! rtl_fileop cd "${PKG_BUILD_DIR}"; then
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		_rc=1; _status="Error: failed to change working directory to \`${PKG_BUILD_DIR}'.";
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	fi; return "${_rc}";
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};
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#
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# ex_pkg_load_vars() - load build variables
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#
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# Return:	zero (0) on success, non-zero (>0) on failure, build variables post-return on success.
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#
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ex_pkg_load_vars() {
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	local _rc=0; _status="";
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	if ! rtl_lmatch "${ARCH}" "nt32 nt64"; then
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		_rc=1; _status="Error: invalid architecture \`${ARCH}'.";
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	elif ! rtl_lmatch "${BUILD_KIND}" "debug release"; then
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		_rc=1; _status="Error: unknown build type \`${BUILD_KIND}'.";
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	else	case "${ARCH}" in
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		nt32)	DEFAULT_TARGET="i686-nt32-midipix"; ;;
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		nt64)	DEFAULT_TARGET="x86_64-nt64-midipix"; ;;
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		esac;
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		rtl_fileop source_opt							\
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			"${HOME}/midipix_build.vars" "${HOME}/.midipix_build.vars"	\
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			../midipix_build.vars ./midipix.env;
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		if [ -z "${PREFIX}" ]; then
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			_rc=1; _status="Error: \${PREFIX} empty or unset.";
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		fi;
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	fi; return "${_rc}";
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};
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#
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# ex_pkg_load_groups() - load all available build groups
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#
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# Return:	zero (0) on success, non-zero (>0) on failure, build groups loaded and ${EX_PKG_BUILD_GROUPS} set post-return.
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#
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ex_pkg_load_groups() {
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	local  _build_groups="" _fname="" _group="" _groups="";
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	for _fname in $(find ./groups -name *.group | sort); do
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		rtl_fileop source_opt "${_fname}";
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		if [ -n "${GROUP_TARGET:-}" ]; then
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			_group="${GROUP_TARGET}"; unset GROUP_TARGET;
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		else
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			_group="${_fname##*/}"; _group="${_group%.group}"; _group="${_group#*.}";
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		fi;
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		if ! rtl_lmatch "${_groups}" "${_group}"; then
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			_groups="$(rtl_lconcat "${_groups}" "${_group}")";
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			if [ -n "${GROUP_AUTO:-}" ]; then
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				if [ "${GROUP_AUTO:-0}" -ne 0 ]; then
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					_build_groups="$(rtl_lconcat "${_build_groups}" "${_group}")";
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				fi;
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				unset GROUP_AUTO;
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			else
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				_build_groups="$(rtl_lconcat "${_build_groups}" "${_group}")";
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			fi;
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		fi;
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	done;
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	EX_PKG_BUILD_GROUPS="$(rtl_uniq "${_build_groups}")";
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};
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#
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# ex_pkg_unfold_depends() - unfold list of package names into dependency-expanded set of complete, disabled, finished, and outstanding package names
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# @_checkfl:		enable (1) or inhibit (0) dependency expansion
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# @_forcefl:		enable (1) or inhibit (0) forcibly rebuilding finished packages
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# @_group_name:		build group name
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# @_pkg_names:		list of package names
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# @_restart:		optional whitespace-separated list of package names to rebuild
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# @_test_finished:	only exclude disabled packages from ${EX_PKG_NAMES} (0,) split finished packages into ${EX_PKG_FINISHED}
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#
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# Return:		zero (0) on success, non-zero (>0) on failure, ${EX_PKG_DISABLED}, ${EX_PKG_FINISHED}, and ${EX_PKG_NAMES} set post-return.
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#
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ex_pkg_unfold_depends() {
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	local	_checkfl="${1}" _forcefl="${2}" _group_name="${3}" _pkg_names="${4}" _restart="${5}" _test_finished="${6}"\
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		_pkg_name="" _restartfl=0;
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	if [ -n "${_restart}" ] && ! rtl_lmatch "${_restart}" "ALL LAST"; then
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		_pkg_names="$(rtl_lsearch "${_pkg_names}" "${_restart}")";
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	fi;
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	if [ -n "${_restart}" ] && [ "${_checkfl:-0}" -eq 1 ]; then
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		_pkg_names="$(rtl_uniq $(rtl_lunfold_depends 'PKG_${_name}_DEPENDS' ${_pkg_names}))";
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	fi;
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	for _pkg_name in ${_pkg_names}; do
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		if [ "${_restart}" = "ALL" ]\
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		|| rtl_lmatch "${_restart}" "${_pkg_name}"; then
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			_restartfl=1;
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		else
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			_restartfl=0;
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		fi;
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		if [ "x$(rtl_get_var_unsafe -u "PKG_${_pkg_name}_DISABLED")" = "x1" ]; then
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			EX_PKG_DISABLED="$(rtl_lconcat "${EX_PKG_DISABLED}" "${_pkg_name}")";
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			_pkg_names="$(rtl_lfilter "${_pkg_names}" "${_pkg_name}")";
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		elif [ "${_test_finished:-1}" -eq 1 ]\
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		&&   ex_pkg_state_test "${_pkg_name}" finish\
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		&&   [ "${_restartfl:-0}" -eq 0 ]\
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		&&   [ "${_forcefl:-0}" -ne 1 ]\
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		&&   [ "x$(rtl_get_var_unsafe -u "${_group_name}_FORCE")" != "x1" ]; then
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			EX_PKG_FINISHED="$(rtl_lconcat "${EX_PKG_FINISHED}" "${_pkg_name}")";
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			_pkg_names="$(rtl_lfilter "${_pkg_names}" "${_pkg_name}")";
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		fi;
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	done;
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	EX_PKG_DISABLED="$(rtl_uniq ${EX_PKG_DISABLED})";
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	EX_PKG_FINISHED="$(rtl_uniq ${EX_PKG_FINISHED})";
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	EX_PKG_NAMES="$(rtl_uniq ${_pkg_names})";
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};
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#
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# ex_pkg_unfold_rdepends() - unfold list of package names into reverse dependency-expanded set of complete, disabled, finished, and outstanding package names
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# @_group_name:		build group name
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# @_pkg_names:		list of package names
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# @_restart:		optional whitespace-separated list of package names to rebuild
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# @_test_finished:	only exclude disabled packages from ${EX_PKG_NAMES} (0,) split finished packages into ${EX_PKG_FINISHED}
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#
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# Return:		zero (0) on success, non-zero (>0) on failure, ${EX_PKG_DISABLED}, ${EX_PKG_FINISHED}, and ${EX_PKG_NAMES} set post-return.
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#
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ex_pkg_unfold_rdepends() {
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	local	_group_name="${1}" _pkg_names="${2}" _restart="${3}" _test_finished="${4}"\
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		_pkg_depends="" _pkg_name="" _pkg_name_depend="" _pkg_rdepends="";
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	for _pkg_name_depend in ${_restart}; do
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		for _pkg_name in ${_pkg_names}; do
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			if [ "${_pkg_name}" != "${_pkg_name_depend}" ]\
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			&& [ "x$(rtl_get_var_unsafe -u "PKG_${_pkg_name}_DISABLED")" != "x1" ]\
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			&& _pkg_depends="$(rtl_lunfold_depends 'PKG_${_name}_DEPENDS' $(rtl_get_var_unsafe -u "PKG_"${_pkg_name}"_DEPENDS"))"\
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			&& [ -n "${_pkg_depends}" ]\
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			&& rtl_lmatch "${_pkg_depends}" "${_pkg_name_depend}"; then
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				_pkg_rdepends="$(rtl_lconcat "${_pkg_rdepends}" "${_pkg_name}")";
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			fi;
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		done;
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	done;
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	_pkg_names="";
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	for _pkg_name in ${_pkg_rdepends}; do
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		if _pkg_depends="$(rtl_lunfold_depends 'PKG_${_name}_DEPENDS' $(rtl_get_var_unsafe -u "PKG_"${_pkg_name}"_DEPENDS"))"\
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		&& [ -n "${_pkg_depends}" ]; then
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			for _pkg_name_depend in ${_pkg_depends}; do
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				if [ "x$(rtl_get_var_unsafe -u "PKG_${_pkg_name_depend}_DISABLED")" = "x1" ]; then
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					EX_PKG_DISABLED="$(rtl_lconcat "${EX_PKG_DISABLED}" "${_pkg_name_depend}")";
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				elif [ "${_test_finished:-1}" -eq 1 ]\
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				&&   ex_pkg_state_test "${_pkg_name_depend}" finish\
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				&&   [ "x$(rtl_get_var_unsafe -u "${_group_name}_FORCE")" != "x1" ]\
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				&&   ! rtl_lmatch "${_pkg_rdepends}" "${_pkg_name_depend}"; then
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					EX_PKG_FINISHED="$(rtl_lconcat "${EX_PKG_FINISHED}" "${_pkg_name_depend}")";
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				elif [ "${_test_finished:-1}" -eq 0 ]\
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				||   ! ex_pkg_state_test "${_pkg_name_depend}" finish\
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				||   [ "x$(rtl_get_var_unsafe -u "${_group_name}_FORCE")" = "x1" ]; then
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					_pkg_names="$(rtl_lconcat "${_pkg_names}" "${_pkg_name_depend}")";
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				fi;
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			done;
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		fi;
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		_pkg_names="$(rtl_lconcat "${_pkg_names}" "${_pkg_name}")";
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	done;
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	EX_PKG_DISABLED="$(rtl_uniq ${EX_PKG_DISABLED})";
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	EX_PKG_FINISHED="$(rtl_uniq ${EX_PKG_FINISHED})";
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	EX_PKG_NAMES="$(rtl_uniq ${_pkg_names})";
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};
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#
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# ex_pkg_unfold_rdepends_direct() - unfold list of package names into direct reverse dependency-expanded set of disabled and outstanding package names
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# @_group_name:		build group name
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# @_pkg_names:		list of package names
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# @_restart:		optional whitespace-separated list of package names to rebuild
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#
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# Return:		zero (0) on success, non-zero (>0) on failure, ${EX_PKG_DISABLED} and ${EX_PKG_RDEPENDS_DIRECT} set post-return.
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#
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ex_pkg_unfold_rdepends_direct() {
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	local	_group_name="${1}" _pkg_names="${2}" _restart="${3}"\
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		_pkg_depends="" _pkg_disabled="" _pkg_name="" _pkg_name_depend="" _pkg_rdepends="";
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	for _pkg_name_depend in ${_restart}; do
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		for _pkg_name in ${_pkg_names}; do
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			if [ "${_pkg_name}" != "${_pkg_name_depend}" ]\
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			&& _pkg_depends="$(rtl_get_var_unsafe -u "PKG_${_pkg_name}_DEPENDS")"\
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			&& [ -n "${_pkg_depends}" ]\
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			&& rtl_lmatch "${_pkg_depends}" "${_pkg_name_depend}"; then
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				if [ "x$(rtl_get_var_unsafe -u "PKG_${_pkg_name}_DISABLED")" != "x1" ]; then
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					_pkg_rdepends="$(rtl_lconcat "${_pkg_rdepends}" "${_pkg_name}")";
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				else
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					_pkg_disabled="$(rtl_lconcat "${_pkg_disabled}" "${_pkg_name}")";
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				fi;
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			fi;
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		done;
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	done;
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	EX_PKG_DISABLED="$(rtl_uniq ${_pkg_disabled})";
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	EX_PKG_RDEPENDS_DIRECT="$(rtl_uniq ${_pkg_rdepends})";
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};
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