util/abuild: Fix or disable shellcheck warnings

This cleans up the shellcheck warnings in abuild.

Warning count:
1 Unexpected ==.
1 Use "${var:?}" to ensure this never expands to / .
1 VARIABLE appears unused. Verify it or export it.
1 Use "$@" (with quotes) to prevent whitespace problems.
2 Consider using { cmd1; cmd2; } >> file instead of individual redirects.
2 Expressions don't expand in single quotes, use double quotes for that.
3 Prefer [ p ] || [ q ] as [ p -o q ] is not well defined.
4 $/${} is unnecessary on arithmetic variables.
5 Check exit code directly with 'if mycmd;', not indirectly with $?.
5 Use cd ... || exit in case cd fails.
11 Declare and assign separately to avoid masking return values.
13 Use $(..) instead of legacy `..`.
20 Don't use variables in the printf format string.
104 Double quote to prevent globbing.

Change-Id: I9c77e122435ba87ce3a4aee76b5022f7265f9ef2
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/17722
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

1 files changed, 151 insertions, 130 deletions

diff --git a/util/abuild/abuild b/util/abuild/abuild
index 300921a6a950..f94e49a9a4c1 100755
--- a/util/abuild/abuild
+++ b/util/abuild/abuild
@@ -32,7 +32,7 @@ export KCONFIG_OVERWRITECONFIG=1
 PAYLOAD=/dev/null
 
 # path to coreboot XGCC
-XGCCPATH="`pwd`/util/crossgcc/xgcc/bin/"
+XGCCPATH="${TOP}/util/crossgcc/xgcc/bin/"
 
 # Add XGCC to the path.
 if [ -d "$XGCCPATH" ] && [[ ":$PATH:" != *":$XGCCPATH:"* ]]; then
@@ -77,30 +77,25 @@ quiet=false
 # clang mode enabled by -sb option.
 scanbuild=false
 
-ARCH=`uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
-	-e s/i86pc/i386/ \
-	-e s/arm.*/arm/ -e s/sa110/arm/ -e s/x86_64/amd64/ \
-	-e "s/Power Macintosh/ppc/"`
-
 trap interrupt INT
 
 function interrupt
 {
-	printf "\n$0: execution interrupted manually.\n"
+	printf "\n%s: execution interrupted manually.\n" "$0"
 	if [ "$mode" == "junit" ]; then
-		printf "$0: deleting incomplete xml output file.\n"
+		printf "%s: deleting incomplete xml output file.\n" "$0"
 	fi
 	exit 1
 }
 
 function debug
 {
-	test "$verbose" == "true" && printf "$*\n"
+	test "$verbose" == "true" && echo "$*"
 }
 
 function junit
 {
-	test "$mode" == "junit" && printf "$*\n" >> $XMLFILE
+	test "$mode" == "junit" && echo "$*" >> "$XMLFILE"
 	return 0
 }
 
@@ -108,9 +103,9 @@ function junitfile
 {
 	test "$mode" == "junit" && {
 		printf '<![CDATA[\n'
-		cat $1
+		cat "$1"
 		printf ']]>\n'
-	} >> $XMLFILE
+	} >> "$XMLFILE"
 }
 
 # Return mainboard descriptors.
@@ -120,6 +115,7 @@ function junitfile
 function get_mainboards
 {
 	local search_space=${1-*/*}
+	# shellcheck disable=SC2086
 	grep -h "^[[:space:]]*config\>[[:space:]]*\<BOARD_" \
 		${ROOT}/src/mainboard/${search_space}/Kconfig.name 2>/dev/null | \
 		sed "s,^.*\<BOARD_\([A-Z0-9_]*\)\>.*$,\1,"
@@ -130,6 +126,7 @@ function mainboard_directory
 {
 	local MAINBOARD=$1
 
+	# shellcheck disable=SC2086
 	grep -l "^[[:space:]]*config\>[[:space:]]*\<BOARD_${MAINBOARD}\>" \
 		${ROOT}/src/mainboard/*/*/Kconfig.name | \
 		sed "s:^$ROOT/src/mainboard/\(.*\)/Kconfig.name$:\1:"
@@ -139,15 +136,17 @@ function mainboard_directory
 function mainboard_vendor
 {
 	local MAINBOARD=$1
+	local kconfig_file
 
-	local kconfig_file=$( \
+	# shellcheck disable=SC2086
+	kconfig_file=$( \
 	grep -l "^[[:space:]]*config\>[[:space:]]*\<BOARD_${MAINBOARD}\>" \
 		${ROOT}/src/mainboard/*/*/Kconfig.name | \
 		sed "s:^\(${ROOT}/src/mainboard/.*\)/.*/\(Kconfig.name\)$:\1/\2:" )
 	if [ ! -f "$kconfig_file" ]; then
 		exit 1
 	fi
-	grep "^[[:space:]]*config\>[[:space:]]*\<VENDOR_" $kconfig_file | \
+	grep "^[[:space:]]*config\>[[:space:]]*\<VENDOR_" "$kconfig_file" | \
 		sed "s,^.*\<VENDOR_\([A-Z0-9_]*\)\>.*$,\1,"
 }
 
@@ -157,16 +156,18 @@ function mainboard_vendor
 # If a directory contains multiple boards, returns them all.
 function normalize_target
 {
-	local targets=$(get_mainboards $1)
+	local targets
+
+	targets=$(get_mainboards "$1")
 	if [ -n "$targets" ]; then
-		echo $targets
+		echo "$targets"
 		return
 	fi
 
-	local targets=$(echo $1 | tr ',' ' ')
+	targets=$(echo "$1" | tr ',' ' ')
 	for i in $targets; do
-		if [ -n "$(mainboard_directory $i)" ]; then
-			echo $i
+		if [ -n "$(mainboard_directory "$i")" ]; then
+			echo "$i"
 		else
 			echo "$i is not a valid target" >&2
 			exit 1
@@ -174,34 +175,36 @@ function normalize_target
 	done
 }
 
+# shellcheck disable=SC2129
 function create_config
 {
 	local BUILD_NAME=$1
 	local build_dir=$2
+	local board_srcdir
 
-	local config_file=${build_dir}/config.build
-	local board_srcdir=$(mainboard_directory ${BUILD_NAME})
+	local config_file="${build_dir}/config.build"
+	board_srcdir="$(mainboard_directory "${BUILD_NAME}")"
 
-	mkdir -p ${build_dir}
-	mkdir -p $TARGET/sharedutils
+	mkdir -p "${build_dir}"
+	mkdir -p "$TARGET/sharedutils"
 
-	if [ "$quiet" == "false" ]; then printf "  Creating config file for $BUILD_NAME... \n"; fi
-	printf "CONFIG_VENDOR_$(mainboard_vendor ${BUILD_NAME})=y\n" > ${config_file}
-	printf "CONFIG_BOARD_${BUILD_NAME}=y\n" >> ${config_file}
-	grep "select[\t ]*ARCH" ${ROOT}/src/mainboard/${board_srcdir}/Kconfig | \
-		sed "s,^.*\(ARCH_.*\)[^A-Z0-9_]*,CONFIG_\1=y," >> ${config_file}
-	printf "CONFIG_MAINBOARD_DIR=\"${board_srcdir}\"\n" >> ${config_file}
+	if [ "$quiet" == "false" ]; then echo "  Creating config file for $BUILD_NAME..."; fi
+	echo "CONFIG_VENDOR_$(mainboard_vendor "${BUILD_NAME}")=y" > "${config_file}"
+	echo "CONFIG_BOARD_${BUILD_NAME}=y" >> "${config_file}"
+	grep "select[\t ]*ARCH" "${ROOT}/src/mainboard/${board_srcdir}/Kconfig" | \
+		sed "s,^.*\(ARCH_.*\)[^A-Z0-9_]*,CONFIG_\1=y," >> "${config_file}"
+	echo "CONFIG_MAINBOARD_DIR=\"${board_srcdir}\"" >> "${config_file}"
 
 	update_config "$BUILD_NAME" "$build_dir" "$config_file"
 
 	ret=$?
 	if [ $ret -eq 0 ]; then
-		if [ "$quiet" == "false" ]; then printf "  $BUILD_NAME config created.\n"; fi
+		if [ "$quiet" == "false" ]; then echo "  $BUILD_NAME config created."; fi
 		return 0
 	else
 		# Does this ever happen?
-		if [ "$quiet" == "false" ]; then printf "$BUILD_NAME config creation FAILED!\nLog excerpt:\n"; fi
-		tail -n $CONTEXT $build_dir/config.log 2> /dev/null || tail -$CONTEXT $build_dir/config.log
+		if [ "$quiet" == "false" ]; then printf "%s config creation FAILED!\nLog excerpt:\n" "$BUILD_NAME"; fi
+		tail -n $CONTEXT "$build_dir/config.log" 2> /dev/null || tail -$CONTEXT "$build_dir/config.log"
 		return 1
 	fi
 }
@@ -212,6 +215,7 @@ function update_config
 	local build_dir=$2
 	local config_file=$3
 
+	local PAYLOAD
 	local defconfig_file
 	defconfig_file=${build_dir}/config.$(echo "${BUILD_NAME}" | tr '[:upper:]' '[:lower:]').default
 
@@ -222,14 +226,15 @@ function update_config
 	# the script returns an absolute path to the payload binary.
 
 	if [ -f "$payloads/payload.sh" ]; then
-		local PAYLOAD=$(sh "$payloads/payload.sh" "$BUILD_NAME")
-		if [ $? -gt 0 ]; then
+		PAYLOAD=$(sh "$payloads/payload.sh" "$BUILD_NAME")
+		local PAYLOAD_OK=$?
+		if [ $PAYLOAD_OK -gt 0 ]; then
 			echo "problem with payload"
 			exit 1
 		fi
 		if [ "$quiet" == "false" ]; then printf "Using payload %s\n" "$PAYLOAD"; fi
 	elif [ "$payloads" = "none" ]; then
-		local PAYLOAD=none
+		PAYLOAD=none
 	fi
 
 	if [ "$PAYLOAD" = "none" ]; then
@@ -257,9 +262,11 @@ function update_config
 	if [ "$quiet" == "false" ]; then echo "    $MAINBOARD ($customizing)"; fi
 	echo "$configoptions" >> "${config_file}"
 
-	 # shellcheck disable=SC2086
-	$MAKE olddefconfig $silent "DOTCONFIG=${config_file}" "obj=${build_dir}" "objutil=$TARGET/sharedutils" &> "${build_dir}/config.log"
-	if [ $? -eq 0 ]; then
+	# shellcheck disable=SC2086
+	$MAKE olddefconfig $silent "DOTCONFIG=${config_file}" "obj=${build_dir}" "objutil=$TARGET/sharedutils" &> "${build_dir}/config.log" ; \
+		CONFIG_OK=$?
+	if [ $CONFIG_OK -eq 0 ]; then
+		# shellcheck disable=SC2086
 		$MAKE savedefconfig $silent DEFCONFIG="${defconfig_file}" DOTCONFIG="${config_file}" obj="${build_dir}" objutil="$TARGET/sharedutils" &> "${build_dir}/config.log"
 		return $?
 	else
@@ -267,6 +274,7 @@ function update_config
 	fi
 }
 
+# shellcheck disable=SC2129
 function create_buildenv
 {
 	local BUILD_NAME=$1
@@ -280,22 +288,22 @@ function create_buildenv
 		cp "$config_file" "$new_config_file"
 		update_config "$BUILD_NAME" "$build_dir" "$new_config_file"
 	fi
-	ret=$?
+	local ret=$?
 
 	# Allow simple "make" in the target directory
 	local MAKEFILE=$TARGET/${BUILD_NAME}/Makefile
-	echo "# autogenerated" > $MAKEFILE
-	echo "TOP=$ROOT" >> $MAKEFILE
-	echo "BUILD=$TARGET" >> $MAKEFILE
-	echo "OBJ=\$(BUILD)/${MAINBOARD}" >> $MAKEFILE
-	echo "OBJUTIL=\$(BUILD)/sharedutils" >> $MAKEFILE
-	echo "all:" >> $MAKEFILE
-	echo "	@cp -a config.h config.h.bak" >> $MAKEFILE
-	echo "	@cd \$(TOP); \$(MAKE) oldconfig DOTCONFIG=\$(OBJ)/config.build objutil=\$(OBJUTIL) obj=\$(OBJ)" >> $MAKEFILE
-	echo "	@tail -n+6 config.h > config.new; tail -n+6 config.h.bak > config.old" >> $MAKEFILE
-	echo "	@cmp -s config.new config.old && cp -a config.h.bak config.h || echo \"Config file changed\"" >> $MAKEFILE
-	echo "	@rm config.h.bak config.new config.old" >> $MAKEFILE
-	echo "	@cd \$(TOP); \$(MAKE) DOTCONFIG=\$(OBJ)/config.build objutil=\$(OBJUTIL) obj=\$(OBJ)" >> $MAKEFILE
+	echo "# autogenerated" > "$MAKEFILE"
+	echo "TOP=$ROOT" >> "$MAKEFILE"
+	echo "BUILD=$TARGET" >> "$MAKEFILE"
+	echo "OBJ=\$(BUILD)/${MAINBOARD}" >> "$MAKEFILE"
+	echo "OBJUTIL=\$(BUILD)/sharedutils" >> "$MAKEFILE"
+	echo "all:" >> "$MAKEFILE"
+	echo "	@cp -a config.h config.h.bak" >> "$MAKEFILE"
+	echo "	@cd \$(TOP); \$(MAKE) oldconfig DOTCONFIG=\$(OBJ)/config.build objutil=\$(OBJUTIL) obj=\$(OBJ)" >> "$MAKEFILE"
+	echo "	@tail -n+6 config.h > config.new; tail -n+6 config.h.bak > config.old" >> "$MAKEFILE"
+	echo "	@cmp -s config.new config.old && cp -a config.h.bak config.h || echo \"Config file changed\"" >> "$MAKEFILE"
+	echo "	@rm config.h.bak config.new config.old" >> "$MAKEFILE"
+	echo "	@cd \$(TOP); \$(MAKE) DOTCONFIG=\$(OBJ)/config.build objutil=\$(OBJUTIL) obj=\$(OBJ)" >> "$MAKEFILE"
 
 	return $ret
 }
@@ -322,41 +330,41 @@ function compile_target
 {
 	local BUILD_NAME=$1
 
-	if [ "$quiet" == "false" ]; then printf "  Compiling $MAINBOARD image$cpuconfig...\n"; fi
+	if [ "$quiet" == "false" ]; then echo "  Compiling $MAINBOARD image$cpuconfig..."; fi
 
 	CURR=$( pwd )
 	#stime=`perl -e 'print time();' 2>/dev/null || date +%s`
-	eval $BUILDPREFIX $MAKE $silent DOTCONFIG=${build_dir}/config.build obj=${build_dir} objutil=$TARGET/sharedutils \
-		&> ${build_dir}/make.log
-	ret=$?
-	cp .xcompile ${build_dir}/xcompile.build
-	cd ${build_dir}
-
-	etime=`perl -e 'print time();' 2>/dev/null || date +%s`
-	duration=$(( $etime - $stime ))
+	# shellcheck disable=SC2086
+	eval $BUILDPREFIX $MAKE $silent DOTCONFIG="${build_dir}/config.build" obj="${build_dir}" objutil="$TARGET/sharedutils" \
+		&> "${build_dir}/make.log" ; \
+		MAKE_FAILED=$?
+	cp .xcompile "${build_dir}/xcompile.build"
+	cd "${build_dir}" || return $?
+
+	etime=$(perl -e 'print time();' 2>/dev/null || date +%s)
+	duration=$(( etime - stime ))
 	junit " <testcase classname='board${testclass/#/.}' name='$BUILD_NAME' time='$duration' >"
 
-	if [ $ret -eq 0 ]; then
+	if [ $MAKE_FAILED -eq 0 ]; then
 		junit "<system-out>"
 		junitfile make.log
 		junit "</system-out>"
 		printf "ok\n" > compile.status
-		printf "$BUILD_NAME built successfully. (took ${duration}s)\n"
+		printf "%s built successfully. (took %ss)\n" "$BUILD_NAME" "${duration}"
 	else
-		ret=1
 		junit "<failure type='BuildFailed'>"
 		junitfile make.log
 		junit "</failure>"
 		printf "failed\n" > compile.status
-		printf "$BUILD_NAME build FAILED after ${duration}s!\nLog excerpt:\n"
+		printf "%s build FAILED after %ss!\nLog excerpt:\n" "$BUILD_NAME" "${duration}"
 		tail -n $CONTEXT make.log 2> /dev/null || tail -$CONTEXT make.log
 		failed=1
 	fi
-	cd $CURR
-	if [ $clean_work = "true" ]; then
-		rm -rf ${build_dir}
+	cd "$CURR" || return $?
+	if [ "$clean_work" = "true" ]; then
+		rm -rf "${build_dir}"
 	fi
-	return $ret
+	return $MAKE_FAILED
 }
 
 function build_config
@@ -365,11 +373,13 @@ function build_config
 	local build_dir=$2
 	local BUILD_NAME=$3
 	local config_file=$4
+	local board_srcdir
+	local ret
 
-	local board_srcdir=$(mainboard_directory "${MAINBOARD}")
+	board_srcdir=$(mainboard_directory "${MAINBOARD}")
 
-	if [ "$(cat "${build_dir}/compile.status" 2>/dev/null)" = "ok" -a \
-		"$buildall" = "false" ]; then
+	if [ "$(cat "${build_dir}/compile.status" 2>/dev/null)" = "ok" ] && \
+		[ "$buildall" = "false" ]; then
 		echo "Skipping $BUILD_NAME; (already successful)"
 		return
 	fi
@@ -389,7 +399,7 @@ function build_config
 
 	if [ "$quiet" == "false" ]; then echo "Building $BUILD_NAME"; fi
 	mkdir -p "$TARGET/${BUILD_NAME}" "$TARGET/abuild"
-	ABSPATH="$(cd "$TARGET/abuild"; pwd)"
+	ABSPATH="$(cd "$TARGET/abuild" && pwd)"
 	XMLFILE="$ABSPATH/${BUILD_NAME}.xml"
 	rm -f "${XMLFILE}"
 
@@ -409,7 +419,7 @@ function build_config
 		junitfile "$build_dir/config.log"
 		junit "</failure>"
 		printf "failed\n" > compile.status
-		printf "$BUILD_NAME build configuration FAILED!\nLog excerpt:\n"
+		printf "%s build configuration FAILED!\nLog excerpt:\n" "$BUILD_NAME"
 		tail -n $CONTEXT "$build_dir/config.log" 2> /dev/null || tail -$CONTEXT "$build_dir/config.log"
 
 		junit "</testcase>"
@@ -417,25 +427,26 @@ function build_config
 	fi
 
 
-	required_arches=`egrep "^CONFIG_ARCH_(BOOTBLOCK|R.MSTAGE|VERSTAGE)" $TARGET/${BUILD_NAME}/config.build | \
-			sed "s,^CONFIG_ARCH_[^_]*_\([^=]*\)=.*$,\1," |sort -u |tr 'A-Z\n\r' 'a-z  '`
-	missing_arches=`printf 'include .xcompile\nall: ; @echo $(foreach arch,'"$required_arches"',$(if $(filter $(arch),$(SUBARCH_SUPPORTED)),,$(arch)))' | make --no-print-directory -f -`
+	required_arches=$(egrep "^CONFIG_ARCH_(BOOTBLOCK|R.MSTAGE|VERSTAGE)" "$TARGET/${BUILD_NAME}/config.build" | \
+			sed "s,^CONFIG_ARCH_[^_]*_\([^=]*\)=.*$,\1," |sort -u |tr 'A-Z\n\r' 'a-z  ')
+	# shellcheck disable=SC2016,SC2059
+	missing_arches=$(printf 'include .xcompile\nall: ; @echo $(foreach arch,'"$required_arches"',$(if $(filter $(arch),$(SUBARCH_SUPPORTED)),,$(arch)))' | make --no-print-directory -f -)
 	if [ -n "$missing_arches" ]; then
-		printf "skipping $BUILD_NAME because we're missing compilers for ($missing_arches)\n"
+		printf "skipping %s because we're missing compilers for (%s)\n" "$BUILD_NAME" "$missing_arches"
 		return
 	fi
 
-	if [ $? -eq 0  -a  $configureonly -eq 0 ]; then
+	if [ $BUILDENV_CREATED -eq 0 ] && [ $configureonly -eq 0 ]; then
 		BUILDPREFIX=
 		if [ "$scanbuild" = "true" ]; then
 			scanbuild_out=$TARGET/${BUILD_NAME}-scanbuild
-			rm -rf ${scanbuild_out}
+			rm -rf "${scanbuild_out}"
 			BUILDPREFIX="scan-build -o ${scanbuild_out}tmp"
 		fi
-		compile_target ${BUILD_NAME}
+		compile_target "${BUILD_NAME}"
 		if [ "$scanbuild" = "true" ]; then
-			mv ${scanbuild_out}tmp/* ${scanbuild_out}
-			rmdir ${scanbuild_out}tmp
+			mv "${scanbuild_out}"tmp/* "${scanbuild_out}"
+			rmdir "${scanbuild_out}tmp"
 		fi
 	fi
 
@@ -446,11 +457,12 @@ function build_config
 function build_target
 {
 	local MAINBOARD=$1
-	local MAINBOARD_LC=$(echo "$MAINBOARD" | tr '[:upper:]' '[:lower:]')
+	local MAINBOARD_LC
+	MAINBOARD_LC=$(echo "$MAINBOARD" | tr '[:upper:]' '[:lower:]')
 
 	# look for config files in the config directory that match the boardname
 	if [ -n "$( find "$configdir" -maxdepth 1 -name "config.${MAINBOARD_LC}*" -print -quit )" ]; then
-		for config in "$configdir"/config."${MAINBOARD_LC}"*; do
+		for config in "$configdir/config.${MAINBOARD_LC}"*; do
 			BUILD_NAME="${config##*/}"
 			BUILD_NAME="${BUILD_NAME##config.}"
 			BUILD_NAME=$(echo "${BUILD_NAME}" | tr '[:lower:]' '[:upper:]')
@@ -485,7 +497,7 @@ function remove_target
 	fi
 
 	echo "Removing build dir for $BUILD_NAME..."
-	rm -rf "$TARGET/${BUILD_NAME}"
+	rm -rf "${TARGET:?}/${BUILD_NAME}"
 
 	return
 }
@@ -555,8 +567,8 @@ buildall=false
 verbose=false
 
 test -f util/sconfig/sconfig.l && ROOT=$( pwd )
-test -f ../util/sconfig/sconfig.l && ROOT=$( cd ..; pwd )
-test "$ROOT" = "" && ROOT=$( cd ../..; pwd )
+test -f ../util/sconfig/sconfig.l && ROOT=$( cd .. && pwd )
+test "$ROOT" = "" && ROOT=$( cd ../.. && pwd )
 
 # Look if we have getopt. If not, build it.
 export PATH=$PATH:util/abuild
@@ -566,18 +578,22 @@ getopt - > /dev/null 2>/dev/null || gcc -o util/abuild/getopt util/abuild/getopt
 cmdline="$* -c 1"
 
 # parse parameters.. try to find out whether we're running GNU getopt
-getoptbrand="`getopt -V`"
+getoptbrand="$(getopt -V)"
+
+# shellcheck disable=SC2086
 if [ "${getoptbrand:0:6}" == "getopt" ]; then
 	# Detected GNU getopt that supports long options.
-	args=`getopt -l version,verbose,quiet,help,all,target:,payloads:,cpus:,silent,junit,config,loglevel:,remove,prefix:,update,scan-build,ccache,blobs,clang,clean,outdir:,chromeos,xmlfile:,kconfig:,dir: -o Vvqhat:p:c:sJCl:rP:uyBLzo:xX:K:d: -- "$@"` || exit 1
+	args=$(getopt -l version,verbose,quiet,help,all,target:,payloads:,cpus:,silent,junit,config,loglevel:,remove,prefix:,update,scan-build,ccache,blobs,clang,clean,outdir:,chromeos,xmlfile:,kconfig:,dir: -o Vvqhat:p:c:sJCl:rP:uyBLzo:xX:K:d: -- "$@") || exit 1
 	eval set -- $args
+	retval=$?
 else
 	# Detected non-GNU getopt
-	args=`getopt Vvqhat:p:c:sJCl:rP:uyBLzo:xX:K:d: $*`
+	args=$(getopt Vvqhat:p:c:sJCl:rP:uyBLzo:xX:K:d: "$@")
 	set -- $args
+	retval=$?
 fi
 
-if [ $? != 0 ]; then
+if [ $retval != 0 ]; then
 	myhelp
 	exit 1
 fi
@@ -590,7 +606,7 @@ configoptions=""
 unset testclass
 while true ; do
 	case "$1" in
-		-J|--junit)     shift; mode=junit; rm -f $XMLFILE ;;
+		-J|--junit)     shift; mode=junit; rm -f "$XMLFILE" ;;
 		-t|--target)	shift; target="$1"; shift;;
 		-a|--all)	shift; buildall=true;;
 		-d|--dir)	shift; configdir="$1"; shift;;
@@ -605,7 +621,7 @@ while true ; do
 			cpus=$1
 			test "$MAKEFLAGS" == "-j max" && export MAKEFLAGS="-j" && cpuconfig=" in parallel"
 			test "$1" == "1" && cpuconfig=" on 1 cpu"
-			expr "$1" : '-\?[0-9]\+$' > /dev/null && test 0$1 -gt 1 && cpuconfig=" on $1 cpus in parallel"
+			expr "$1" : '-\?[0-9]\+$' > /dev/null && test "0$1" -gt 1 && cpuconfig=" on $1 cpus in parallel"
 			shift;;
 		-s|--silent)    shift; silent="-s";;
 		--scan-build)   shift
@@ -653,7 +669,7 @@ while true ; do
 			;;
 		-X|--xmlfile)	shift; XMLFILE=$1; REAL_XMLFILE=$1; shift;;
 		-K|--kconfig)	shift
-			testclass=="$(basename $1 | tr '.' '_' )"
+			testclass="$(basename "$1" | tr '.' '_' )"
 			customizing="${customizing}, $1 config"
 			configoptions="$(cat "$1")${configoptions}\n"
 			shift;;
@@ -663,12 +679,12 @@ while true ; do
 	esac
 done
 
-if [ -z "$TARGET" -o "$TARGET" = "/" ]; then
+if [ -z "$TARGET" ] || [ "$TARGET" = "/" ]; then
 	echo "Please specify a valid, non-root build directory."
 	exit 1
 fi
 
-customizing=`echo $customizing |cut -c3-`
+customizing=$(echo "$customizing" | cut -c3-)
 if [ "$customizing" = "" ]; then
 	customizing="default configuration"
 fi
@@ -692,44 +708,48 @@ build_targets()
 {
 	local targets=${*-$(get_mainboards)}
 	for MAINBOARD in $targets; do
-		build_target ${MAINBOARD}
+		build_target "${MAINBOARD}"
 	done
 }
 else
 build_targets()
 {
+	local ABSPATH
+	local stime
+	local etime
+
 	local targets=${*-$(get_mainboards)}
 	# seed shared utils
-	TMPCFG=`mktemp`
-	printf "$configoptions" > $TMPCFG
-	$MAKE -j $cpus DOTCONFIG=$TMPCFG obj=$TARGET/temp objutil=$TARGET/sharedutils allnoconfig
-	printf "$configoptions" >> $TMPCFG
-	yes "" 2>/dev/null | $MAKE -j $cpus DOTCONFIG=$TMPCFG obj=$TARGET/temp objutil=$TARGET/sharedutils oldconfig 2>/dev/null |head > /dev/null
+	TMPCFG=$(mktemp)
+	printf "%s" "$configoptions" > "$TMPCFG"
+	$MAKE -j "$cpus" DOTCONFIG="$TMPCFG" obj="$TARGET/temp" objutil="$TARGET/sharedutils" allnoconfig
+	printf "%s" "$configoptions" >> "$TMPCFG"
+	yes "" 2>/dev/null | $MAKE -j "$cpus" DOTCONFIG="$TMPCFG" obj="$TARGET/temp" objutil="$TARGET/sharedutils" oldconfig 2>/dev/null |head > /dev/null
 	BUILDPREFIX=
 	if [ "$scanbuild" = "true" ]; then
 		scanbuild_out=$TARGET/sharedutils-scanbuild
-		rm -rf ${scanbuild_out}
+		rm -rf "${scanbuild_out}"
 		BUILDPREFIX="scan-build -o ${scanbuild_out}tmp"
 	fi
-	mkdir -p $TARGET/abuild
-	local ABSPATH=`cd $TARGET/abuild; pwd`
-	local XMLFILE=$ABSPATH/__util.xml
-	rm -f ${XMLFILE}
-	local stime=`perl -e 'print time();' 2>/dev/null || date +%s`
-	$BUILDPREFIX $MAKE -j $cpus DOTCONFIG=$TMPCFG obj=$TARGET/temp objutil=$TARGET/sharedutils tools > $TARGET/sharedutils/make.log 2>&1
+	mkdir -p "$TARGET/abuild"
+	ABSPATH="$(cd "$TARGET/abuild" && pwd)"
+	local XMLFILE="$ABSPATH/__util.xml"
+	rm -f "${XMLFILE}"
+	stime=$(perl -e 'print time();' 2>/dev/null || date +%s)
+	$BUILDPREFIX $MAKE -j "$cpus" DOTCONFIG="$TMPCFG" obj="$TARGET/temp" objutil="$TARGET/sharedutils" tools > "$TARGET/sharedutils/make.log" 2>&1
 	local ret=$?
-	local etime=`perl -e 'print time();' 2>/dev/null || date +%s`
-	local duration=$(( $etime - $stime ))
+	etime=$(perl -e 'print time();' 2>/dev/null || date +%s)
+	local duration=$(( etime - stime ))
 
 	junit " <testcase classname='util' name='all' time='$duration' >"
 	if [ $ret -eq 0 ]; then
 		junit "<system-out>"
-		junitfile $TARGET/sharedutils/make.log
+		junitfile "$TARGET/sharedutils/make.log"
 		junit "</system-out>"
 		junit "</testcase>"
 	else
 		junit "<failure type='BuildFailed'>"
-		junitfile $TARGET/sharedutils/make.log
+		junitfile "$TARGET/sharedutils/make.log"
 		junit "</failure>"
 		junit "</testcase>"
 		return
@@ -739,11 +759,12 @@ build_targets()
 	fi
 
 	if [ "$scanbuild" = "true" ]; then
-		mv ${scanbuild_out}tmp/* ${scanbuild_out}
-		rmdir ${scanbuild_out}tmp
+		mv "${scanbuild_out}tmp/"* "${scanbuild_out}"
+		rmdir "${scanbuild_out}tmp"
 	fi
-	rm -rf $TARGET/temp $TMPCFG
-	echo $targets | xargs -P ${cpus:-0} -n 1 $0 $cmdline -t
+	rm -rf "$TARGET/temp" "$TMPCFG"
+	# shellcheck disable=SC2086
+	echo $targets | xargs -P ${cpus:-0} -n 1 "$0" $cmdline -t
 }
 fi
 
@@ -756,33 +777,33 @@ junit '<testsuite>'
 
 if [ "$target" != "" ]; then
 	# build a single board
-	MAINBOARD=$(normalize_target ${target})
+	MAINBOARD=$(normalize_target "${target}")
 	if [ -z "${MAINBOARD}" ]; then
-		printf "No such target: $target\n"
+		printf "No such target: %s\n" "$target"
 		exit 1
 	fi
-	build_srcdir=$(mainboard_directory ${MAINBOARD})
-	if [ "$(echo ${MAINBOARD} | wc -w)" -gt 1 ]; then
-		build_targets ${MAINBOARD}
-	elif [ ! -r $ROOT/src/mainboard/${build_srcdir} ]; then
-		printf "No such target: ${MAINBOARD}\n"
+	build_srcdir="$(mainboard_directory "${MAINBOARD}")"
+	if [ "$(echo "${MAINBOARD}" | wc -w)" -gt 1 ]; then
+		build_targets "${MAINBOARD}"
+	elif [ ! -r "$ROOT/src/mainboard/${build_srcdir}" ]; then
+		echo "No such target: ${MAINBOARD}"
 		exit 1
 	else
-		build_target ${MAINBOARD}
+		build_target "${MAINBOARD}"
 		test "$mode" != "text" && \
-		test -f $TARGET/abuild/${MAINBOARD}.xml && \
-		cat $TARGET/abuild/${MAINBOARD}.xml >> $REAL_XMLFILE
+		test -f "$TARGET/abuild/${MAINBOARD}.xml" && \
+		cat "$TARGET/abuild/${MAINBOARD}.xml" >> "$REAL_XMLFILE"
 		XMLFILE=$REAL_XMLFILE
 	fi
 else
 	build_targets
-	rm -f $REAL_XMLFILE
-	XMLFILE=$REAL_XMLFILE
+	rm -f "$REAL_XMLFILE"
+	XMLFILE="$REAL_XMLFILE"
 	junit '<?xml version="1.0" encoding="utf-8"?>'
 	junit '<testsuite>'
 	if [ "$mode" != "text" ]; then
 		for xmlfile in $TARGET/abuild/*_*.xml; do
-			cat $xmlfile >> $REAL_XMLFILE
+			cat "$xmlfile" >> "$REAL_XMLFILE"
 		done
 	fi
 	XMLFILE=$REAL_XMLFILE