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#!/bin/sh
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# Copyright (c) 2016 Lucio Andrés Illanes Albornoz <l.illanes@gmx.de>
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#
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. ./build.subr;
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VALID_BUILD_LEVELS="fetch,extract,build_dir,autoconf,patch,configure,clean,build,install";
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#
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# Process command line arguments.
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while [ ${#} -gt 0 ]; do
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case ${1} in
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-c)	ARG_CLEAN=1; ;;
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-d)	disable_build_script_link "${2}"; exit; ;;
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-e)	enable_build_script_link "${2}"; exit; ;;
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-t*)	export ARG_TARBALL=1; [ "${1#-t.}" != "${1}" ] && TARBALL_SUFFIX=${1#-t.}; ;;
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-v)	export ARG_VERBOSE=1; ;;
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-x)	ARG_XTRACE=1; set -o xtrace; ;;
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-a)	[ -z "${2}" ] && exec cat build.usage || ARCH="${2}"; shift; ;;
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-b)	[ -z "${2}" ] && exec cat build.usage || BUILD="${2}"; shift; ;;
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-pi)	[ -z "${2}" ] && exec cat build.usage || insert_build_script_link "${2}"; exit; ;;
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-pr)	[ -z "${2}" ] && exec cat build.usage || remove_build_script_link "${2}"; exit; ;;
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-r)	[ -n "${ARG_RESTART_SCRIPT}" ] && exec cat build.usage;
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	if [ "${2#*:*}" != "${2}" ]; then
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		ARG_RESTART_SCRIPT="${2%%:*}"; ARG_RESTART_SCRIPT_AT="${2##*:}";
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		if [ "${ARG_RESTART_SCRIPT_AT}" != diff ]; then
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			for __ in $(split , "${ARG_RESTART_SCRIPT_AT}"); do
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				if ! match_list "${VALID_BUILD_LEVELS}" , "${__}"; then
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					log_msg fail "Error: unknown build level specified.";
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					exec cat build.usage;
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				fi;
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			done;
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		fi;
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	else
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		ARG_RESTART_SCRIPT="${2}"; ARG_RESTART_SCRIPT_AT=ALL;
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	fi;
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	if [ ! -e "${ARG_RESTART_SCRIPT}" ]; then
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		log_msg fail "Error: unknown build script specified.";
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		exec cat build.usage;
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	fi;
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	shift; ;;
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*=*)	set_var_unsafe "${1%%=*}" "${1#*=}"; ;;
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*)	exec cat build.usage; ;;
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esac; shift; done;
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if [ -e /proc/cpuinfo ]; then
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	BUILD_CPUS=$(awk '/^processor/{cpus++} END{print cpus}' /proc/cpuinfo);
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fi;
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# Source the build variables file and its local overrides, if any.
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for __ in ${HOME}/midipix_build.vars ../midipix_build.vars ./build.vars; do
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	[ -e ${__} ] && . ${__};
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done;
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#
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# Clear the environment.
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# Check whether the pathnames in build.vars contain non-empty valid values.
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# Check whether all prerequisite command names resolve.
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# Check whether all prerequisite pathnames resolve.
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# Check whether all prerequisite Perl modules exist.
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for __ in $(export | sed -e 's/^export //' -e 's/=.*$//'); do
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	if ! match_list "${CLEAR_ENV_VARS_EXCEPT}" " " "${__}"; then
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		unset "${__}";
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	fi;
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done;
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for __ in ${CHECK_PATH_VARS}; do
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	if [ -z "${___:=$(get_var_unsafe "${__}")}" ]; then
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		log_msg failexit "Error: variable \`${__}' is empty or unset.";
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	elif [ "${___#* *}" != "${___}" ]; then
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		log_msg failexit "Error: variable \`${__}' contains one or more whitespace characters.";
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	fi;
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done;
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for __ in ${CHECK_PREREQ_CMDS} ${CHECK_PREREQ_FILES}; do
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	if [ "${__#/}" != "${__}" ]; then
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		if [ ! -e "${__}" ]; then
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			log_msg fail "Error: missing prerequisite file \`${__}'.";
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			__exit=1;
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		fi;
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	else
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		if ! test_cmd "${__}"; then
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			log_msg fail "Error: missing prerequisite command \`${__}'.";
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			__exit=1;
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		fi;
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	fi;
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done;
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for __ in ${CHECK_PREREQ_PERL_MODULES}; do
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	if ! perl -M"${__}" -e "" 2>/dev/null; then
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		log_msg fail "Error: missing prerequisite Perl module \`${__}'.";
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		__exit=1;
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	fi;
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done;
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if [ ${__exit:-0} = 1 ]; then
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	exit 1;
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elif [ -n "${__exit}" ]; then
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	unset __exit;
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fi;
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# Clean ${PREFIX} if requested.
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if [ ${ARG_CLEAN:-0} -eq 1 ]; then
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	log_msg info "-c specified, cleaning prefix...";
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	for __ in ${CLEAR_PREFIX_DIRS}; do
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		if [ -e ${PREFIX}/${__} ]; then
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			secure_rm ${PREFIX}/${__};
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		fi;
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	done;
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fi;
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# Create directory hierarchy and usr -> . symlinks.
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insecure_mkdir ${PREFIX} ${PREFIX_NATIVE} ${PREFIX_CROSS} ${PREFIX_TARGET}/lib ${DLCACHEDIR} ${WORKDIR};
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for __ in ${PREFIX}/usr ${PREFIX_NATIVE}/usr; do
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	if [ ! -L "${__}" ]; then
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		secure_rm "${__}"; ln -sf -- . "${__}";
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	fi;
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done;
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insecure_mkdir ${PREFIX_MINIPIX}/bin;
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for __ in lib libexec share; do
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	if [ ! -e ${PREFIX_MINIPIX}/${__} ]; then
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		ln -sf bin ${PREFIX_MINIPIX}/${__};
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	fi;
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done;
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if [ -e ${BUILD_LOG_FNAME} ]; then
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	mv -- ${BUILD_LOG_FNAME} ${BUILD_LOG_LAST_FNAME};
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fi;
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touch ${BUILD_STATUS_IN_PROGRESS_FNAME};
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{(
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BUILD_DATE_START="$(date %Y-%m-%d-%H-%M-%S)";
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BUILD_NFINI=${BUILD_NSKIP:=${BUILD_NFAIL:=${BUILD_NBUILT:=0}}};
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BUILD_TIMES_SECS=$(command date +%s);
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log_msg info "Build started by ${BUILD_USER:=${USER}}@${BUILD_HNAME:=$(hostname)} at ${BUILD_DATE_START}.";
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log_env_vars "build (global)" ${LOG_ENV_VARS};
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for BUILD_LVL in 0 1 2 3 9; do
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	for BUILD_SCRIPT_FNAME in ${BUILD_LVL}[0-9][0-9].*.build; do
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		if [ -n "${ARG_RESTART_SCRIPT}" ]					\
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		&& [ "${ARG_RESTART_SCRIPT}" != "ALL" ]					\
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		&& [ "${ARG_RESTART_SCRIPT}" != ${BUILD_SCRIPT_FNAME} ]; then
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			if [ ${ARG_XTRACE:-0} -eq 0 ]; then
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				log_msg info "Skipped build script \`${BUILD_SCRIPT_FNAME}' (--build-scripts policy.)";
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			fi;
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			continue;
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		elif [ ! -f "${BUILD_SCRIPT_FNAME}" ]; then
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			log_msg info "Build script \`${BUILD_SCRIPT_FNAME}' non-existent or not a file.";
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			continue;
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		else
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			unset BUILD_SCRIPT_RC; : $((BUILD_NBUILT+=1));
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			if [ "${ARG_RESTART_SCRIPT}" != ALL ]\
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			&& is_build_script_done finish "${BUILD_SCRIPT_FNAME%.build}"; then
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				log_msg info "Skipped build script \`${BUILD_SCRIPT_FNAME}' (already built.)";
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					: $((BUILD_NSKIP+=1)); BUILD_SCRIPT_RC=0; continue;
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			fi;
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			log_msg info "Invoking build script${ARG_RESTART_SCRIPT:+ (forcibly)} \`${BUILD_SCRIPT_FNAME}'${ARG_RESTART_SCRIPT_AT:+ at build step ${ARG_RESTART_SCRIPT_AT}}.";
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			(set -o errexit -o noglob;					\
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			 set -- $(split . ${BUILD_SCRIPT_FNAME%%.build*});		\
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			 SCRIPT_FNAME=${BUILD_SCRIPT_FNAME};				\
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			 SCRIPT_NAME=${SCRIPT_FNAME%%.build*};				\
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			 export PKG_BUILD=${BUILD};					\
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			 export PKG_TARGET=${TARGET};					\
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			 export PKG_PREFIX=$(get_vars_unsafe PKG_LVL${BUILD_LVL}_PREFIX	\
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					PKG_$(echo ${2} | tr a-z A-Z)_PREFIX);		\
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			 export MIDIPIX_BUILD_PWD=$(pwd); cd ${WORKDIR};		\
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			 for SCRIPT_SOURCE in build.subr ${SCRIPT_NAME}.vars		\
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					${BUILD_SCRIPT_FNAME}; do			\
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			 	[ -f ${MIDIPIX_BUILD_PWD}/${SCRIPT_SOURCE} ] &&		\
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					 . ${MIDIPIX_BUILD_PWD}/${SCRIPT_SOURCE};	\
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			 done);
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			case ${BUILD_SCRIPT_RC:=${?}} in
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			0) log_msg succ "Finished build script \`${BUILD_SCRIPT_FNAME}'.";
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				: $((BUILD_NFINI+=1)); continue; ;;
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			*) log_msg fail "Build failed in build script \`${BUILD_SCRIPT_FNAME}' (last return code ${BUILD_SCRIPT_RC}.).";
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				: $((BUILD_NFAIL+=1)); break; ;;
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			esac;
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		fi;
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	done;
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	if [ ${BUILD_SCRIPT_RC:-0} -ne 0 ]; then
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		break;
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	fi;
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done;
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log_msg info "${BUILD_NFINI} finished, ${BUILD_NSKIP} skipped, and ${BUILD_NFAIL} failed builds in ${BUILD_NBUILT} build script(s).";
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: $((BUILD_TIMES_SECS=$(command date +%s)-${BUILD_TIMES_SECS}));
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: $((BUILD_TIMES_HOURS=${BUILD_TIMES_SECS}/3600));
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: $((BUILD_TIMES_MINUTES=(${BUILD_TIMES_SECS}%3600)/60));
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: $((BUILD_TIMES_SECS=(${BUILD_TIMES_SECS}%3600)%60));
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log_msg info "Build time: ${BUILD_TIMES_HOURS} hour(s), ${BUILD_TIMES_MINUTES} minute(s), and ${BUILD_TIMES_SECS} second(s).";
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if [ -f "${BUILD_STATUS_IN_PROGRESS_FNAME}" ]; then
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	secure_rm ${BUILD_STATUS_IN_PROGRESS_FNAME};
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fi;
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exit ${BUILD_SCRIPT_RC})} 2>&1 | tee ${BUILD_LOG_FNAME} &
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TEE_PID=${!};
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trap "rm -f ${BUILD_STATUS_IN_PROGRESS_FNAME};	\
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	log_msg fail \"Build aborted.\";	\
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	echo kill ${TEE_PID};			\
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	kill ${TEE_PID}" HUP INT TERM USR1 USR2;
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wait;
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# vim:filetype=sh