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#
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# set +o errexit -o noglob is assumed.
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#
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buildp_init_args() {
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	local _last_pkg=""; _status="";
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	if [ "${ARG_AS_NEEDED:-0}" -eq 1 ]\
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	&& [ -e "${PREFIX}/build.gitref" ]\
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	&& [ "$(git rev-parse HEAD)" = "$(cat "${PREFIX}/build.gitref")" ]; then
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		_status="Git repository has not changed since last build and --as-needed was specified.";
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	fi;
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	if [ -n "${ARG_RESTART}" ]; then
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		if [ "${ARG_RESTART#\*\*\*}" != "${ARG_RESTART}" ]; then
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			ARG_RESTART="${ARG_RESTART#\*\*\*}"; ARG_RESTART_RECURSIVE=3;
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		elif [ "${ARG_RESTART#\*\*}" != "${ARG_RESTART}" ]; then
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			ARG_RESTART="${ARG_RESTART#\*\*}"; ARG_RESTART_RECURSIVE=2;
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		elif [ "${ARG_RESTART#\*}" != "${ARG_RESTART}" ]; then
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			ARG_RESTART="${ARG_RESTART#\*}"; ARG_RESTART_RECURSIVE=1;
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		fi;
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	fi;
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	case "${ARG_RESTART}" in
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	ALL)	ARG_RESTART_AT=ALL; ARG_RESTART_RECURSIVE=2; ;;
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	LAST)	ARG_RESTART_AT=ALL; ARG_RESTART_RECURSIVE=0; ;;
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	"")	;;
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	*:*)	ARG_RESTART_AT="${ARG_RESTART#*:}"; ARG_RESTART="$(rtl_llift "${ARG_RESTART%%:*}" "," " ")"; ;;
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	*)	ARG_RESTART="$(rtl_llift "${ARG_RESTART}" "," " ")"; ARG_RESTART_AT=ALL; ;;
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	esac;
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	if [ "${ARG_RESTART}" = "LAST" ]; then
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		if [ -n "${DEFAULT_BUILD_LAST_FAILED_PKG_FNAME}" ]\
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		&& [ -e "${DEFAULT_BUILD_LAST_FAILED_PKG_FNAME}" ]; then
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			_last_pkg="$(cat "${DEFAULT_BUILD_LAST_FAILED_PKG_FNAME}")";
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			rtl_fileop rm "${DEFAULT_BUILD_LAST_FAILED_PKG_FNAME}";
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			rtl_state_clear "${BUILD_WORKDIR}" "${_last_pkg}";
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			ARG_RESTART="${_last_pkg}";
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		fi;
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	fi;
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	rtl_log_set_vnfo_lvl "${ARG_VERBOSE:-0}";
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	case "${ARG_FETCH_FORCE}" in
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	ipv4)	DEFAULT_GIT_ARGS="$(rtl_lconcat "-4" "${DEFAULT_GIT_ARGS}")";
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		DEFAULT_WGET_ARGS="$(rtl_lconcat "-4" "${DEFAULT_GIT_ARGS}")"; ;;
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	ipv6)	DEFAULT_GIT_ARGS="$(rtl_lconcat "-6" "${DEFAULT_GIT_ARGS}")";
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		DEFAULT_WGET_ARGS="$(rtl_lconcat "-6" "${DEFAULT_GIT_ARGS}")"; ;;
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	esac;
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	return 0;
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};
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buildp_init_defaults() {
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	local _rc=0; _status="";
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	# Command-line arguments
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	: ${ARCH:="nt64"}; : ${BUILD:="debug"};
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	ARG_AS_NEEDED=0; ARG_CLEAN_BUILDS=""; ARG_DEBUG_MINIPIX=0; ARG_DUMP_IN="";
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	ARG_DUMP_ON_ABORT=0; ARG_DIST=""; ARG_FETCH_FORCE=0; ARG_PARALLEL=1; ARG_RELAXED=0;
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	ARG_RESTART=""; ARG_VERBOSE=0;
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	# Build parameters & state
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	BUILD_HNAME=""; BUILD_IS_PARENT=1; BUILD_GROUPS=""; BUILD_GROUPS_INHIBIT_DEPS=0;
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	BUILD_TARGET=""; BUILD_USER=""; MIDIPIX_BUILD_PWD="";
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	# Global defaults
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	DEFAULT_BUILD_CPUS=1;
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	DEFAULT_BUILD_LAST_FAILED_PKG_FNAME=""
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	DEFAULT_BUILD_LOG_FNAME="";
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	DEFAULT_BUILD_STATUS_IN_PROGRESS_FNAME="";
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	DEFAULT_BUILD_STEPS="";
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	DEFAULT_BUILD_VARS="";
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	DEFAULT_CLEAR_PREFIX_PATHS="";
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	DEFAULT_GIT_ARGS="";
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	DEFAULT_GITROOT_HEAD="";
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	DEFAULT_LOG_ENV_VARS="";
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	DEFAULT_TARGET="";
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	DEFAULT_WGET_ARGS="";
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	return "${_rc}";
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};
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buildp_init_env() {
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	local _fname="" _rc=0; _status="";
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	if ! umask 022; then
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		printf "Error: failed to setup environment.\n"; exit 1;
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	else	for _fname in $(find subr -name *.subr); do
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			if ! . "${_fname}"; then
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				printf "Error: failed to source \`%s'.\n" "${_fname}"; exit 1;
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			fi;
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		done; fi;
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	return "${_rc}";
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};
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buildp_init_files() {
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	local _log_last_fname="" _log_last_num=1 _rc=0; _status=""
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	if ! rtl_fileop mkdir "${BUILD_DLCACHEDIR}" "${BUILD_WORKDIR}"\
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	|| rtl_lmatch "${ARG_DIST}" "rpm" ","\
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	&& ! rtl_fileop mkdir "${PREFIX_RPM}"; then
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		_rc=1; _status="Error: cannot create build directories.";
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	elif [ -e "${DEFAULT_BUILD_STATUS_IN_PROGRESS_FNAME}" ]; then
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		_rc=1; _status="Error: another build targeting this architecture and build type is currently in progress.";
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	elif ! rtl_clean_env "${DEFAULT_CLEAR_ENV_VARS_EXCEPT}"; then
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		_rc=1; _status="Error: failed to clean environment.";
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	elif ! rtl_check_path_vars "${DEFAULT_CHECK_PATH_VARS}"; then
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		_rc=1; _status="${_status}";
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	else	touch "${DEFAULT_BUILD_STATUS_IN_PROGRESS_FNAME}";
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		if [ -e "${DEFAULT_BUILD_LOG_FNAME}" ]; then
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			while [ -e "${DEFAULT_BUILD_LOG_FNAME}.${_log_last_num}" ]; do
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				: $((_log_last_num+=1));
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			done;
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			_log_last_fname="${DEFAULT_BUILD_LOG_FNAME}.${_log_last_num}";
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			rtl_fileop mv "${DEFAULT_BUILD_LOG_FNAME}" "${_log_last_fname}";
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			rtl_fileop ln_symbolic "${_log_last_fname}" "${DEFAULT_BUILD_LOG_LAST_FNAME}";
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		fi;
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		rtl_fileop touch "${DEFAULT_BUILD_LOG_FNAME}";
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		if rtl_lmatch "${ARG_CLEAN_BUILDS}" "prefix" ","; then
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			rtl_log_msg info "-C prefix specified, cleaning prefix...";
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			for _pname in ${DEFAULT_CLEAR_PREFIX_PATHS}; do
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				if ! rtl_fileop rm "${PREFIX}/${_pname}"; then
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					_rc=1; _status="Error: failed to remove \`${PREFIX}/${_pname}'."; break;
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				fi;
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			done;
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		fi;
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		export PATH="${PREFIX}/bin${PATH:+:${PATH}}";
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	fi;
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	return "${_rc}";
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};
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buildp_init_getopts() {
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	local _arg="" _opt="" _rc=0 _shiftfl=0 OPTIND=0; _status="";
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	while [ "${#}" -gt 0 ]; do
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		case "${1}" in
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		--as-needed)	ARG_AS_NEEDED=1; _shiftfl=1; ;;
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		--dump-in)	if [ "${#}" -ge 2 ]; then
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					ARG_DUMP_IN="${2}"; ARG_DUMP_ON_ABORT=1; _shiftfl=2;
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				else
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					_rc=1; _status="Error: missing argument to option --dump-in.";
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				fi; ;;
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		--dump-on-abort)
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				ARG_DUMP_ON_ABORT=1; _shiftfl=1; ;;
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		--debug-minipx)	ARG_DEBUG_MINIPIX=1; _shiftfl=1; ;;
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		-v*)		_opt="${1#-}"; while [ -n "${_opt}" ]; do
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					: $((ARG_VERBOSE+=1)); _opt="${_opt#?}";
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				done; _shiftfl=1; ;;
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		*)		_shiftfl=0; ;;
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		esac;
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		if [ "${_rc}" -ne 0 ]; then
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			break;
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		elif [ "${_shiftfl}" -gt 0 ]; then
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			shift "${_shiftfl}"; continue;
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		elif getopts a:b:C:D:Fhp:Pr:R _opt; then
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			case "${_opt}" in
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			a)	ARCH="${OPTARG}"; ;;
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			b)	BUILD="${OPTARG}"; ;;
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			C)	ARG_CLEAN_BUILDS="${OPTARG}"; ;;
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			D)	ARG_DIST="${OPTARG}"; ;;
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			F)	ARG_FETCH_FORCE=1; ;;
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			h)	cat etc/build.usage; exit 0; ;;
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			p)	ARG_PARALLEL="${OPTARG}"; ;;
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			P)	ARG_PARALLEL="auto"; ;;
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			r)	ARG_RESTART="${OPTARG}"; ;;
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			R)	ARG_RELAXED=1; ;;
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			*)	cat etc/build.usage; exit 1; ;;
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			esac; shift $((${OPTIND}-1)); OPTIND=1;
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		else
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			break;
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		fi;
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	done;
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	if [ "${_rc}" -eq 0 ]; then
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		if [ "${ARG_DUMP_ON_ABORT:-0}" -eq 1 ]\
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		&& [ "${ARG_RELAXED:-0}" -eq 1 ]; then
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			_rc=1; _status="Error: --dump-on-abort excludes -R.";
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		else	while [ ${#} -gt 0 ]; do
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			if [ "${1#\*}" != "${1}" ]; then
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				BUILD_GROUPS_INHIBIT_DEPS=1; _arg="${1#\*}";
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			else
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				_arg="${1}";
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			fi;
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			case "${_arg}" in
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			*=*)		rtl_set_var_unsafe "${_arg%%=*}" "${_arg#*=}"; ;;
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			[^a-zA-Z]*)	_rc=1; _status="Error: build group names must start with [a-zA-Z] (in argument \`${_arg}'.)"; ;;
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			*[^_a-zA-Z]*)	_rc=1; _status="Error: build group names must not contain [^_a-zA-Z] (in argument \`${_arg}'.)"; ;;
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			*)		BUILD_GROUPS="$(rtl_lconcat "${BUILD_GROUPS}" "${_arg}")"; ;;
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			esac; shift; done;
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		fi;
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	fi;
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	return "${_rc}";
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};
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buildp_init_groups() {
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	local _default_build_groups="" _fname="" _group="" _groups="" _rc=0; _status="";
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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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					_default_build_groups="$(rtl_lconcat "${_default_build_groups}" "${_group}")";
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				fi;
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				unset GROUP_AUTO;
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			else
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				_default_build_groups="$(rtl_lconcat "${_default_build_groups}" "${_group}")";
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			fi;
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		fi;
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	done;
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	_default_build_groups="$(rtl_uniq "${_default_build_groups}")";
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	if ! rtl_lmatch "${ARG_DIST}" "rpm" ","; then
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		_default_build_groups="$(rtl_lfilter "${_default_build_groups}" "host_deps_rpm")";
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	fi;
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	if [ -z "${BUILD_GROUPS}" ]; then
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		BUILD_GROUPS="${_default_build_groups}";
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	fi;
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	if [ -n "${ARG_DIST}" ]; then
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		BUILD_GROUPS="$(rtl_lconcat "$(rtl_lfilter "${BUILD_GROUPS}" "dist")" "dist")";
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	fi;
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	for _group in ${BUILD_GROUPS}; do
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		if ! rtl_lmatch "${_groups}" "${_group}"; then
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			_rc=1; _status="Error: unknown build group \`${_group}'."; break;
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		fi;
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	done;
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	return "${_rc}";
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};
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buildp_init_prereqs() {
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	local _cmd="" _cmds_missing="" _rc=0; _status="";
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	for _cmd in	\
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			awk bunzip2 bzip2 cat chmod cmake cp date find flock	\
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			g++ gcc git grep gunzip gzip hostname install kill	\
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			ln lzip make mkdir mkfifo mktemp mv paste patch perl	\
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			pgrep pkill printf readlink rm sed sha256sum sort	\
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			tail tar test touch tr uniq wget xz zip; do
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		if ! which "${_cmd}" >/dev/null 2>&1; then
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			_cmds_missing="${_cmds_missing:+${_cmds_missing} }${_cmd}";
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		fi;
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	done;
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	if [ -n "${_cmds_missing}" ]; then
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		_rc=1; _status="Error: missing prerequisite package(s): ${_cmds_missing}";
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	elif ! (FNAME="$(mktemp)" && { trap "rm -f \"\${FNAME}\"" EXIT;		\
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			sed -i'' -e '' "${FNAME}" >/dev/null 2>&1; }); then
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		_rc=1; _status="Error: sed(1) in \${PATH} does not support the \`-i' option.";
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	fi;
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	return "${_rc}";
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};
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buildp_init_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 "${BUILD}" "debug release"; then
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		_rc=1; _status="Error: unknown build type \`${BUILD}'.";
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	elif [ -n "${ARG_PARALLEL}" ] &&  [ "${ARG_PARALLEL}" != "auto" ]\
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	&&   ! rtl_isnumber "${ARG_PARALLEL}"; then
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		_rc=1; _status="Error: invalid jobs count \`${ARG_PARALLEL}'.";
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	else	case "${ARCH}" in
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		nt32)	DEFAULT_TARGET="i686-nt32-midipix"; ;;
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		nt64)	DEFAULT_TARGET="x86_64-nt64-midipix"; ;;
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		esac;
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		if DEFAULT_BUILD_CPUS="$(rtl_get_cpu_count)"; then
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			if [ "${ARG_PARALLEL}" = "auto" ]\
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			&& [ "${DEFAULT_BUILD_CPUS}" -gt 1 ]; then
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				ARG_PARALLEL=$((${DEFAULT_BUILD_CPUS}/2));
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			fi;
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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 "${PREFIX}" ]; then
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				_rc=1; _status="Error: \${PREFIX} empty or unset.";
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			fi;
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		fi;
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	fi; return "${_rc}";
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};
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build_init() {
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	local _fname="" _rc=0 _status="";
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	if ! buildp_init_env		\
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	|| ! buildp_init_defaults	\
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	|| ! buildp_init_getopts "${@}"	\
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	|| ! buildp_init_prereqs	\
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	|| ! buildp_init_vars		\
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	|| ! buildp_init_groups		\
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	|| ! buildp_init_args		\
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	|| ! buildp_init_files; then
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		_rc="${?}"; rtl_log_msg fail "${_status}"; exit "${_rc}";
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	elif [ -n "${_status}" ]; then
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		rtl_log_msg info "${_status}"; exit 0;
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	else
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		return "${_rc}";
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	fi;
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};
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# vim:filetype=sh