diff --git a/build b/build
index 3794923..89b42cf 100755
--- a/build
+++ b/build
@@ -1,9 +1,9 @@
 #!/usr/bin/env sh
 # SPDX-License-Identifier: GPL-3.0-or-later
-# SPDX-FileCopyrightText: 2014,2015,2020-2024 Leah Rowe <leah@libreboot.org>
-# SPDX-FileCopyrightText: 2015 Patrick "P. J." McDermott <pj@pehjota.net>
-# SPDX-FileCopyrightText: 2015, 2016 Klemens Nanni <contact@autoboot.org>
-# SPDX-FileCopyrightText: 2022, Caleb La Grange <thonkpeasant@protonmail.com>
+# Copyright (c) 2014-2015,2020-2024 Leah Rowe <leah@libreboot.org>
+# Copyright (c) 2015 Patrick "P. J." McDermott <pj@pehjota.net>
+# Copyright (c) 2015-2016 Klemens Nanni <contact@autoboot.org>
+# Copyright (c) 2022 Caleb La Grange <thonkpeasant@protonmail.com>
 
 set -u -e
 
@@ -39,39 +39,33 @@ main()
 	version) printf "%s\n" "$relname" ;;
 	release) shift 1; mkrelease $@ ;;
 	*)
-		[ -f "${spath}" ] || $err "Bad command. Check docs."
-		shift 1; "$spath" $@ || $err "excmd: ${spath} ${@}" ;;
+		[ -f "$spath" ] || $err "Bad command. Check docs."
+		shift 1; "$spath" $@ || $err "excmd: $spath $@" ;;
 	esac
 }
 
 install_packages()
 {
-	if [ $# -lt 2 ]; then
-		printf "You must specify a distro, namely:\n" 1>&2
-		printf "Look at files under config/dependencies/\n" 1>&2
-		printf "Example: ./build dependencies debian\n" 1>&2
-		$err "install_packages: target not specified"
-	fi
+	[ $# -lt 2 ] && $err "Bad command. Check docs."
+	[ -f "config/dependencies/$2" ] || $err "Unsupported target"
 
-	[ -f "config/dependencies/${2}" ] || $err "Unsupported target"
-
-	. "config/dependencies/${2}"
+	. "config/dependencies/$2"
 
 	x_ $pkg_add $pkglist && [ -n "$aur_notice" ] && \
-	printf "Please install AUR packages: %s\n" "$aur_notice" 1>&2; return 0
+	printf "You need AUR packages: %s\n" "$aur_notice" 1>&2; return 0
 }
 
 git_init()
 {
 	[ -L ".git" ] && return 1
 	[ -e ".git" ] && return 0
-	eval "$(setvars "$(date -Rud @${versiondate})" cdate _nogit)"
+	eval "$(setvars "$(date -Rud @$versiondate)" cdate _nogit)"
 
 	git init || return 1
 	git add -A . || return 1
-	git commit -m "${projectname} ${version}" --date "${cdate}" \
+	git commit -m "$projectname $version" --date "$cdate" \
 	    --author="xbmk <xbmk@example.com>" || return 1
-	git tag -a "${version}" -m "${projectname} ${version}" || return 1
+	git tag -a "$version" -m "$projectname $version" || return 1
 }
 
 mkrelease()
@@ -80,54 +74,54 @@ mkrelease()
 
 	vdir="release"
 	while getopts d:m: option; do
-		[ -z "${OPTARG}" ] && $err "Empty argument not allowed"
-		case "${option}" in
-		d) vdir="${OPTARG}" ;;
-		m) mode="${OPTARG}" ;;
+		[ -z "$OPTARG" ] && $err "Empty argument not allowed"
+		case "$option" in
+		d) vdir="$OPTARG" ;;
+		m) mode="$OPTARG" ;;
 		*) $err "Invalid option" ;;
 		esac
 	done
 
-	vdir="${vdir}/${version}"
+	vdir="$vdir/$version"
 	src_dirname="${relname}_src"
-	srcdir="${vdir}/${src_dirname}"
+	srcdir="$vdir/$src_dirname"
 
-	[ -e "${vdir}" ] && $err "already exists: \"${vdir}\""
-	mkdir -p "${vdir}" || $err "mkvdir: !mkdir -p \"${vdir}\""
-	git clone . "${srcdir}" || $err "mkdir: !gitclone \"${srcdir}\""
+	[ -e "$vdir" ] && $err "already exists: \"$vdir\""
+	mkdir -p "$vdir" || $err "mkvdir: !mkdir -p \"$vdir\""
+	git clone . "$srcdir" || $err "mkdir: !gitclone \"$srcdir\""
 
 	build_release
 
-	printf "\n\nDONE! Check release files under %s\n" "${vdir}"
+	printf "\n\nDONE! Check release files under %s\n" "$vdir"
 }
 
 build_release()
 {
-	_xm="build_release ${vdir}"
+	_xm="build_release $vdir"
 	(
-	cd "${srcdir}" || $err "${_xm}: !cd \"${srcdir}\""
+	cd "$srcdir" || $err "$_xm: !cd \"$srcdir\""
 	fetch_trees
 	x_ mv src/docs docs
 	) || $err "can't create release files"
 
 	git log --graph --pretty=format:'%Cred%h%Creset %s %Creset' \
-	    --abbrev-commit > "${srcdir}/CHANGELOG" || $err "!gitlog $srcdir"
+	    --abbrev-commit > "$srcdir/CHANGELOG" || $err "!gitlog $srcdir"
 
 	(
-	cd "${srcdir%/*}" || $err "${_xm}: mktarball \"${srcdir}\""
+	cd "${srcdir%/*}" || $err "$_xm: mktarball \"$srcdir\""
 	mktarball "${srcdir##*/}" "${srcdir##*/}.tar.xz" || $err "$_xm: mksrc"
 	) || $err "can't create src tarball"
-	[ "${mode}" = "src" ] && return 0
+	[ "$mode" = "src" ] && return 0
 
 	(
-	cd "${srcdir}" || $err "${_xm}: 2 !cd \"${srcdir}\""
-	./build roms all || $err "${_xm}: roms-all"
-	./build roms serprog rp2040 || $err "${_xm}: rp2040"
-	./build roms serprog stm32 || $err "${_xm}: stm32"
+	cd "$srcdir" || $err "$_xm: 2 !cd \"$srcdir\""
+	./build roms all || $err "$_xm: roms-all"
+	./build roms serprog rp2040 || $err "$_xm: rp2040"
+	./build roms serprog stm32 || $err "$_xm: stm32"
 	x_ mv bin ../roms
 	) || $err "can't build rom images"
 
-	rm -Rf "${srcdir}" || $err "!rm -Rf ${srcdir}"
+	rm -Rf "$srcdir" || $err "!rm -Rf $srcdir"
 }
 
 fetch_trees()
@@ -151,8 +145,8 @@ fail()
 
 tmp_cleanup()
 {
-	[ "${tmpdir_was_set}" = "n" ] || return 0
-	rm -Rf "${tmpdir}" || return 1
+	[ "$tmpdir_was_set" = "n" ] || return 0
+	rm -Rf "$tmpdir" || return 1
 }
 
 main $@
diff --git a/include/deblob.sh b/include/deblob.sh
index 73ff3e5..ce41096 100644
--- a/include/deblob.sh
+++ b/include/deblob.sh
@@ -2,31 +2,30 @@
 # SPDX-FileCopyrightText: 2020,2021,2023,2024 Leah Rowe <leah@libreboot.org>
 
 # can delete from multi- and single-tree projects.
-# called from build_projects() and handle_src_tree() on script/update/trees
+# called from script/trees when downloading sources.
 nukeblobs()
 {
 	del="n"
 	pjcfgdir="${1%/}"
 	pjsrcdir="${2%/}"
 	pjsrcdir="${pjsrcdir#src/}"
-	[ ! -f "config/${pjcfgdir}/blobs.list" ] && return 0
+	[ ! -f "config/$pjcfgdir/blobs.list" ] && return 0
 
 	while read -r blobfile; do
-		rmf="$(realpath "src/${pjsrcdir}/${blobfile}" 2>/dev/null)" || \
+		rmf="$(realpath "src/$pjsrcdir/$blobfile" 2>/dev/null)" || \
 		    continue
-		[ -L "${rmf}" ] && continue # we will delete the actual file
-		[ "${rmf#${PWD}/src/${pjsrcdir}}" = "${rmf}" ] && continue
-		[ "${rmf#${PWD}/src/}" = "${pjsrcdir}" ] && continue
-		rmf="${rmf#${PWD}/}"
-		[ -e "${rmf}" ] || continue
+		[ -L "$rmf" ] && continue # we will delete the actual file
+		[ "${rmf#"$PWD/src/$pjsrcdir"}" = "$rmf" ] && continue
+		[ "${rmf#"$PWD/src/"}" = "$pjsrcdir" ] && continue
+		rmf="${rmf#"$PWD/"}"
+		[ -e "$rmf" ] || continue
 		del="y"
-		rm -Rf "${rmf}" || \
-		    $err "nukeblobs ${pjcfgdir}/blobs: can't rm \"${blobfile}\""
-		printf "nukeblobs %s: deleted \"%s\"\n" "${pjcfgdir}" "${rmf}"
-	done < "config/${pjcfgdir}/blobs.list"
+		rm -Rf "$rmf" || $err "$pjcfgdir/blobs: can't rm \"$blobfile\""
+		printf "nukeblobs %s: deleted \"%s\"\n" "$pjcfgdir" "$rmf"
+	done < "config/$pjcfgdir/blobs.list"
 
 	[ "${del}" = "y" ] && return 0
 	printf "nukeblobs %s: no defined blobs exist in dir, src/%s\n" 1>&2 \
-	    "${pjcfgdir}" "${pjsrcdir}"
-	printf "(this is not an error)\n"
+	    "$pjcfgdir" "$pjsrcdir"
+	printf "(this is not an error)\n" 1>&2
 }
diff --git a/include/git.sh b/include/git.sh
index 6ab35b6..dbdf30d 100755
--- a/include/git.sh
+++ b/include/git.sh
@@ -1,34 +1,30 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
-# SPDX-FileCopyrightText: 2020,2021,2023,2024 Leah Rowe <leah@libreboot.org>
-# SPDX-FileCopyrightText: 2022 Caleb La Grange <thonkpeasant@protonmail.com>
+# Copyright (c) 2020-2021,2023-2024 Leah Rowe <leah@libreboot.org>
+# Copyright (c) 2022 Caleb La Grange <thonkpeasant@protonmail.com>
 
 eval "$(setvars "" _target rev _xm loc url bkup_url depend tree_depend xtree \
     mdir subrev subrepo subrepo_bkup)"
 
 fetch_project_trees()
 {
-	_target="${target}"
-	[ ! -d "src/${project}/${project}" ] && x_ mkdir -p "src/${project}" \
-	    && fetch_project_repo "${project}"
+	_target="$target"
+	[ ! -d "src/$project/$project" ] && x_ mkdir -p "src/$project" \
+	    && fetch_project_repo "$project"
 	fetch_config
-	if [ -d "src/${project}/${tree}" ]; then
-		printf "download/%s %s (%s): exists\n" \
-		    "${project}" "${tree}" "${_target}" 1>&2
-		return 0
-	fi
+	e "src/$project/$tree" d && return 0
 	prepare_new_tree
 }
 
 fetch_config()
 {
-	rm -f "${cfgsdir}/"*/seen || $err "fetch_config ${cfgsdir}: !rm seen"
+	rm -f "$cfgsdir/"*/seen || $err "fetch_config $cfgsdir: !rm seen"
 	eval "$(setvars "" xtree tree_depend)"
 	while true; do
 		eval "$(setvars "" rev tree)"
-		_xm="fetch_config ${project}/${_target}"
-		load_target_config "${_target}"
-		[ "${_target}" = "${tree}" ] && break
-		_target="${tree}"
+		_xm="fetch_config $project/$_target"
+		load_target_config "$_target"
+		[ "$_target" = "$tree" ] && break
+		_target="$tree"
 	done
 	[ -n "$tree_depend" ] && [ "$tree_depend" != "$tree" ] && \
 		x_ ./update trees -f "$project" "$tree_depend"; return 0
@@ -37,8 +33,7 @@ fetch_config()
 load_target_config()
 {
 	[ -f "$cfgsdir/$1/target.cfg" ] || $err "$1: target.cfg missing"
-	[ -f "${cfgsdir}/${1}/seen" ] && \
-		$err "${_xm} check: infinite loop in tree definitions"
+	[ -f "$cfgsdir/$1/seen" ] && $err "$_xm cfg: infinite loop in trees"
 
 	. "$cfgsdir/$1/target.cfg" || $err "load_target_config !$cfgsdir/$1"
 	touch "$cfgsdir/$1/seen" || $err "load_config $cfgsdir/$1: !mk seen"
@@ -48,8 +43,8 @@ prepare_new_tree()
 {
 	printf "Creating %s tree %s (%s)\n" "$project" "$tree" "$_target"
 
-	cp -R "src/${project}/${project}" "${tmpgit}" || \
-	    $err "prepare_new_tree ${project}/${tree}: can't make tmpclone"
+	cp -R "src/$project/$project" "$tmpgit" || \
+	    $err "prepare_new_tree $project/$tree: can't make tmpclone"
 	git_prep "$PWD/$cfgsdir/$tree/patches" "src/$project/$tree" "update"
 	nukeblobs "$project/$tree" "$project/$tree"
 }
@@ -58,32 +53,29 @@ fetch_project_repo()
 {
 	eval "$(setvars "" xtree tree_depend)"
 
-	scan_config "${project}" "config/git"
+	scan_config "$project" "config/git"
 	[ -z "${loc+x}" ] && $err "fetch_project_repo $project: loc not set"
 	[ -z "${url+x}" ] && $err "fetch_project_repo $project: url not set"
 
 	clone_project
-	[ -z "${depend}" ] || for d in ${depend} ; do
-		x_ ./update trees -f ${d}
+	[ -z "$depend" ] || for d in $depend ; do
+		x_ ./update trees -f $d
 	done
-	rm -Rf "${tmpgit}" || $err "fetch_repo: !rm -Rf ${tmpgit}"
+	rm -Rf "$tmpgit" || $err "fetch_repo: !rm -Rf $tmpgit"
 
 	for x in config/git/*; do
- 		[ -f "${x}" ] && nukeblobs "${x##*/}" "src/${x##*/}"; continue
+ 		[ -f "$x" ] && nukeblobs "${x##*/}" "src/${x##*/}"; continue
 	done
 }
 
 clone_project()
 {
 	loc="${loc#src/}"
-	loc="src/${loc}"
-	if [ -d "${loc}" ]; then
-		printf "%s already exists, so skipping download\n" "$loc" 1>&2
-		return 0
-	fi
+	loc="src/$loc"
+	e "$loc" d && return 0
 
 	git clone $url "$tmpgit" || git clone $bkup_url "$tmpgit" \
-	    || $err "clone_project: could not download ${project}"
+	    || $err "clone_project: could not download $project"
 	git_prep "$PWD/config/$project/patches" "$loc"
 }
 
@@ -113,7 +105,7 @@ prep_submodules()
 {
 	[ -f "$tmpgit/.gitmodules" ] || return 0
 
-	mdir="${PWD}/config/submodule/$project"
+	mdir="$PWD/config/submodule/$project"
 	[ -n "$tree" ] && mdir="$mdir/$tree"
 
 	if [ -f "$mdir/module.list" ]; then
@@ -142,8 +134,7 @@ fetch_submodule()
 	    $err "! . $mcfgdir/module.cfg"
 
 	if [ -n "$subrepo" ] || [ -n "$subrepo_bkup" ]; then
-		[ -n "$subrev" ] || \
-		    $err "$1 as per $mdir: subrev not defined"
+		[ -n "$subrev" ] || $err "$1, $mdir: subrev not defined"
 
 		rm -Rf "$tmpgit/$1" || $err "!rm '$mdir' '$1'"
 		for mod in "$subrepo" "$subrepo_bkup"; do
@@ -154,16 +145,15 @@ fetch_submodule()
 		done
 		[ -d "$tmpgit/$1" ] || $err "!clone $mod $project $mcfgdir $1"
 	else
-		git -C "$tmpgit" submodule update --init -- "$1" || \
-		    $err "$mdir: !update $1"
+		git -C "$tmpgit" submodule update --init -- "$1" || $err \
+		    "$mdir: !update $1"
 	fi
 }
 
 patch_submodule()
 {
-	[ -z "$subrev" ] || \
-		git -C "$tmpgit/$1" reset --hard "$subrev" || \
-		    $err "$mdir $1: cannot reset git revision"
+	[ -z "$subrev" ] || git -C "$tmpgit/$1" reset --hard "$subrev" || \
+	    $err "$mdir $1: cannot reset git revision"
 
 	git_am_patches "$tmpgit/$1" "$mdir/${1##*/}/patches"
 }
@@ -172,7 +162,7 @@ git_am_patches()
 {
 	for _patch in "$2/"*; do
 		[ -L "$_patch" ] || [ ! -f "$_patch" ] || git -C "$1" am \
-		    "$_patch" || $err "git_am $1 $2: !git am $_patch"; continue
+		    "$_patch" || $err "$1 $2: !git am $_patch"; continue
 	done
 	for _patches in "$2/"*; do
 		[ ! -L "$_patches" ] && [ -d "$_patches" ] && \
diff --git a/include/option.sh b/include/option.sh
index 6ab2735..eff5551 100755
--- a/include/option.sh
+++ b/include/option.sh
@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: GPL-3.0-only
-# SPDX-FileCopyrightText: 2022 Caleb La Grange <thonkpeasant@protonmail.com>
-# SPDX-FileCopyrightText: 2022 Ferass El Hafidi <vitali64pmemail@protonmail.com>
-# SPDX-FileCopyrightText: 2020-2024 Leah Rowe <leah@libreboot.org>
+# Copyright (c) 2022 Caleb La Grange <thonkpeasant@protonmail.com>
+# Copyright (c) 2022 Ferass El Hafidi <vitali64pmemail@protonmail.com>
+# Copyright (c) 2020-2024 Leah Rowe <leah@libreboot.org>
 
 export LC_COLLATE=C
 export LC_ALL=C
@@ -13,13 +13,13 @@ ifdtool="cbutils/default/ifdtool"
 cbfstool="cbutils/default/cbfstool"
 grubcfgsdir="config/grub"
 layoutdir="/boot/grub/layouts"
-. "${grubcfgsdir}/modules.list"
-tmpgit="${PWD}/tmp/gitclone"
+. "$grubcfgsdir/modules.list"
+tmpgit="$PWD/tmp/gitclone"
 err="err_"
 
 err_()
 {
-	printf "ERROR %s: %s\n" "${0}" "${1}" 1>&2
+	printf "ERROR %s: %s\n" "$0" "$1" 1>&2
 	exit 1
 }
 
@@ -27,14 +27,14 @@ setvars()
 {
 	_setvars=""
 	[ $# -lt 2 ] && $err "setvars: too few arguments"
-	val="${1}" && shift 1
+	val="$1" && shift 1
 	for var in $@; do
-		_setvars="${var}=\"${val}\"; ${_setvars}"
+		_setvars="$var=\"$val\"; $_setvars"
 	done
 	printf "%s\n" "${_setvars% }"
 }
-eval "$(setvars "" versiondate tmpdir _nogit version board boarddir \
-    xbmk_release threads projectname relname)"
+eval "$(setvars "" xbmk_release tmpdir _nogit version board boarddir relname \
+    versiondate threads projectname)"
 
 # if "y": a coreboot target won't be built if target.cfg says release="n"
 # (this is used to exclude certain build targets from releases)
@@ -44,16 +44,16 @@ set | grep XBMK_RELEASE 1>/dev/null 2>/dev/null || xbmk_release="n" || :
 export XBMK_RELEASE="$xbmk_release"
 
 set | grep TMPDIR 1>/dev/null 2>/dev/null || tmpdir_was_set="n"
-if [ "${tmpdir_was_set}" = "y" ]; then
+if [ "$tmpdir_was_set" = "y" ]; then
 	[ "${TMPDIR%_*}" = "/tmp/xbmk" ] || tmpdir_was_set="n"
 fi
-if [ "${tmpdir_was_set}" = "n" ]; then
+if [ "$tmpdir_was_set" = "n" ]; then
 	export TMPDIR="/tmp"
 	tmpdir="$(mktemp -d -t xbmk_XXXXXXXX)"
-	export TMPDIR="${tmpdir}"
+	export TMPDIR="$tmpdir"
 else
-	export TMPDIR="${TMPDIR}"
-	tmpdir="${TMPDIR}"
+	export TMPDIR="$TMPDIR"
+	tmpdir="$TMPDIR"
 fi
 
 set | grep XBMK_THREADS 1>/dev/null 2>/dev/null && threads="$XBMK_THREADS"
@@ -63,7 +63,7 @@ expr "X$threads" : "X-\{0,1\}[0123456789][0123456789]*$" \
 export XBMK_THREADS="$threads"
 
 x_() {
-	[ $# -lt 1 ] || ${@} || $err "Unhandled non-zero exit: $@"; return 0
+	[ $# -lt 1 ] || $@ || $err "Unhandled non-zero exit: $@"; return 0
 }
 
 [ -e ".git" ] || [ -f "version" ] || printf "unknown\n" > version || \
@@ -73,53 +73,49 @@ x_() {
 
 read -r projectname < projectname || :
 [ ! -f version ] || read -r version < version || :
-version_="${version}"
+version_="$version"
 [ ! -e ".git" ] || version="$(git describe --tags HEAD 2>&1)" || \
-    version="git-$(git rev-parse HEAD 2>&1)" || version="${version_}"
+    version="git-$(git rev-parse HEAD 2>&1)" || version="$version_"
 [ ! -f versiondate ] || read -r versiondate < versiondate || :
-versiondate_="${versiondate}"
+versiondate_="$versiondate"
 [ ! -e ".git" ] || versiondate="$(git show --no-patch --no-notes \
-    --pretty='%ct' HEAD)" || versiondate="${versiondate_}"
+    --pretty='%ct' HEAD)" || versiondate="$versiondate_"
 for p in projectname version versiondate; do
 	eval "[ -n \"\$$p\" ] || $err \"$p unset\""
 	eval "x_ printf \"%s\\n\" \"\$$p\" > $p"
 done
-relname="${projectname}-${version}"
-export LOCALVERSION="-${projectname}-${version%%-*}"
+relname="$projectname-$version"
+export LOCALVERSION="-$projectname-${version%%-*}"
 
 items()
 {
 	rval=1
-	if [ ! -d "${1}" ]; then
-		printf "items: directory '%s' doesn't exist" "${1}" 1>&2
-		return 1
-	fi
-	for x in "${1}/"*; do
+	e "$1" d not && return 1
+	for x in "$1/"*; do
 		# -e used because this is for files *or* directories
-		[ -e "${x}" ] || continue
+		[ -e "$x" ] || continue
 		[ "${x##*/}" = "build.list" ] && continue
 		printf "%s\n" "${x##*/}" 2>/dev/null
 		rval=0
 	done
-	return ${rval}
+	return $rval
 }
 
 scan_config()
 {
-	awkstr=" /\{.*${1}.*}{/ {flag=1;next} /\}/{flag=0} flag { print }"
-	confdir="${2}"
+	awkstr=" /\{.*$1.*}{/ {flag=1;next} /\}/{flag=0} flag { print }"
+	confdir="$2"
 	revfile="$(mktemp -t sources.XXXXXXXXXX)"
-	cat "${confdir}/"* > "${revfile}" || \
-	    $err "scan_config ${confdir}: Cannot concatenate files"
+	cat "$confdir/"* > "$revfile" || $err "$confdir: can't cat files"
 	while read -r line ; do
-		set ${line} 1>/dev/null 2>/dev/null || :
+		set $line 1>/dev/null 2>/dev/null || :
 		if [ "${1%:}" = "depend" ]; then
-			depend="${depend} ${2}"
+			depend="$depend $2"
 		else
-			eval "${1%:}=\"${2}\""
+			eval "${1%:}=\"$2\""
 		fi
 	done << EOF
-	$(eval "awk '${awkstr}' \"${revfile}\"")
+	$(eval "awk '$awkstr' \"$revfile\"")
 EOF
 	rm -f "$revfile" || $err "scan_config: Cannot remove tmpfile"
 }
@@ -127,27 +123,26 @@ EOF
 check_defconfig()
 {
 	[ -d "$1" ] || $err "Target '$1' not defined."
-	for x in "${1}"/config/*; do
-		[ -f "${x}" ] && printf "%s\n" "$x" && return 1
+	for x in "$1"/config/*; do
+		[ -f "$x" ] && printf "%s\n" "$x" && return 1
 	done
 }
 
 handle_coreboot_utils()
 {
 	for util in cbfstool ifdtool; do
-		x_ ./update trees ${_f} "src/coreboot/${1}/util/${util}"
-		[ -z "${mode}" ] && [ ! -f "cbutils/${1}/${util}" ] && \
-			x_ mkdir -p "cbutils/${1}" && \
-			x_ cp "src/coreboot/${1}/util/${util}/${util}" \
-			    "cbutils/${1}"
-		[ -z "${mode}" ] || x_ rm -Rf "cbutils/${1}"
+		x_ ./update trees $_f "src/coreboot/$1/util/$util"
+		[ -z "$mode" ] && [ ! -f "cbutils/$1/$util" ] && \
+			x_ mkdir -p "cbutils/$1" && \
+			x_ cp "src/coreboot/$1/util/$util/$util" "cbutils/$1"
+		[ -z "$mode" ] || x_ rm -Rf "cbutils/$1"
 	done
 }
 
 remkdir()
 {
-	rm -Rf "${1}" || $err "remkdir: !rm -Rf \"${1}\""
-	mkdir -p "${1}" || $err "remkdir: !mkdir -p \"${1}\""
+	rm -Rf "$1" || $err "remkdir: !rm -Rf \"$1\""
+	mkdir -p "$1" || $err "remkdir: !mkdir -p \"$1\""
 }
 
 git_err()
@@ -158,9 +153,9 @@ git_err()
 
 mkrom_tarball()
 {
-	printf "%s\n" "${version}" > "${1}/version" || $err "$1 !version"
-	printf "%s\n" "${versiondate}" > "${1}/versiondate" || $err "$1 !vdate"
-	printf "%s\n" "${projectname}" > "${1}/projectname" || $err "$1 !pname"
+	printf "%s\n" "$version" > "$1/version" || $err "$1 !version"
+	printf "%s\n" "$versiondate" > "$1/versiondate" || $err "$1 !vdate"
+	printf "%s\n" "$projectname" > "$1/projectname" || $err "$1 !pname"
 
 	mktarball "$1" "${1%/*}/${relname}_${1##*/}.tar.xz"
 	x_ rm -Rf "$1"
@@ -168,20 +163,20 @@ mkrom_tarball()
 
 mktarball()
 {
-	[ "${2%/*}" = "${2}" ] || \
+	[ "${2%/*}" = "$2" ] || \
 		mkdir -p "${2%/*}" || $err "mk, !mkdir -p \"${2%/*}\""
 	printf "\nCreating archive: %s\n\n" "$2"
 	tar -c "$1" | xz -T$threads -9e > "$2" || \
 	    $err "mktarball 2, $1"
-	mksha512sum "${2}" "${2##*/}.sha512"
+	mksha512sum "$2" "${2##*/}.sha512"
 }
 
 mksha512sum()
 {
 	(
-	[ "${1%/*}" != "${1}" ] && x_ cd "${1%/*}"
-	sha512sum ./"${1##*/}" >> "${2}" || \
-	    $err "!sha512sum \"${1}\" > \"${2}\""
+	[ "${1%/*}" != "$1" ] && x_ cd "${1%/*}"
+	sha512sum ./"${1##*/}" >> "$2" || \
+	    $err "!sha512sum \"$1\" > \"$2\""
 	) || $err "failed to create tarball checksum"
 }
 
@@ -193,3 +188,15 @@ rmgit()
 	find . -name ".gitmodules" -exec rm -Rf {} + || $err "!rm .gitmod $1"
 	) || $err "Cannot remove .git/.gitmodules in $1"
 }
+
+e()
+{
+	es_t="e"
+	[ $# -gt 1 ] && es_t="$2"
+	es2=""
+	estr="[ -$es_t \"\$1\" ] || return 1"
+	[ $# -gt 2 ] && estr="[ -$es_t \"\$1\" ] && return 1" && es2="not "
+
+	eval "$estr"
+	printf "%s %sfound\n" "$1" "$es2" 1>&2
+}
diff --git a/script/roms b/script/roms
index 00a8c52..19b30b7 100755
--- a/script/roms
+++ b/script/roms
@@ -1,10 +1,10 @@
 #!/usr/bin/env sh
 # SPDX-License-Identifier: GPL-3.0-or-later
-# SPDX-FileCopyrightText: 2014-2016,2020,2021,2023,2024 Leah Rowe <leah@libreboot.org>
-# SPDX-FileCopyrightText: 2021,2022 Ferass El Hafidi <vitali64pmemail@protonmail.com>
-# SPDX-FileCopyrightText: 2022 Caleb La Grange <thonkpeasant@protonmail.com>
-# SPDX-FileCopyrightText: 2022-2023 Alper Nebi Yasak <alpernebiyasak@gmail.com>
-# SPDX-FileCopyrightText: 2023 Riku Viitanen <riku.viitanen@protonmail.com>
+# Copyright (c) 2014-2016,2020-2021,2023-2024 Leah Rowe <leah@libreboot.org>
+# Copyright (c) 2021-2022 Ferass El Hafidi <vitali64pmemail@protonmail.com>
+# Copyright (c) 2022 Caleb La Grange <thonkpeasant@protonmail.com>
+# Copyright (c) 2022-2023 Alper Nebi Yasak <alpernebiyasak@gmail.com>
+# Copyright (c) 2023 Riku Viitanen <riku.viitanen@protonmail.com>
 
 set -u -e
 
@@ -14,64 +14,56 @@ seavgabiosrom="elf/seabios/default/libgfxinit/vgabios.bin"
 grub_background="background1280x800.png"
 grubelf="elf/grub/grub.elf"
 cfgsdir="config/coreboot"
-pico_src_dir="src/pico-serprog"
-pico_sdk_dir="src/pico-sdk"
-stm32_src_dir="src/stm32-vserprog"
+picosrc="src/pico-serprog"
+picosdk="src/pico-sdk"
+stm32src="src/stm32-vserprog"
 
 # Disable all payloads by default.
 # target.cfg files have to specifically enable [a] payload(s)
-pv="payload_grub payload_grub_withseabios payload_seabios payload_memtest t"
-pv="${pv} payload_seabios_withgrub payload_seabios_grubonly payload_uboot memtest_bin"
+pv="payload_uboot payload_grub_withseabios payload_seabios payload_memtest t"
+pv="$pv payload_seabios_withgrub payload_seabios_grubonly payload_grub mt86bin"
 v="romdir cbrom initmode displaymode cbcfg targetdir tree keymaps release"
-v="${v} grub_timeout ubdir board grub_scan_disk uboot_config"
-eval "$(setvars "n" ${pv} serprog)"
-eval "$(setvars "" ${v} boards _displaymode _payload _keyboard all targets \
+v="$v grub_timeout ubdir board grub_scan_disk uboot_config"
+eval "$(setvars "n" $pv serprog)"
+eval "$(setvars "" $v boards _displaymode _payload _keyboard all targets \
     serprog_boards_dir)"
 
 main()
 {
 	while [ $# -gt 0 ]; do
-		case ${1} in
-		list)
-			x_ items config/coreboot
-			return 0 ;;
-		serprog)
-			serprog="y"
-			shift 1; break ;;
-		-d) _displaymode="${2}" ;;
-		-p) _payload="${2}" ;;
-		-k) _keyboard="${2}" ;;
+		case "$1" in
+		list) x_ items config/coreboot; return 0 ;;
+		serprog) serprog="y"; shift 1; break ;;
+		-d) _displaymode="$2" ;;
+		-p) _payload="$2" ;;
+		-k) _keyboard="$2" ;;
 		*)
-			[ "${1}" = "all" ] && all="y"
-			boards="${1} ${boards}"
+			[ "$1" = "all" ] && all="y"
+			boards="$1 $boards"
 			shift && continue ;;
 		esac
 		shift 2
 	done
 
 	if [ "$serprog" = "y" ]; then
-		handle_serprog $@
-		return 0
+		handle_serprog $@; return 0
 	else
-		[ "${all}" != "y" ] || boards=$(items config/coreboot) || \
+		[ "$all" != "y" ] || boards="$(items config/coreboot)" || \
 			$err "Cannot generate list of boards for building"
-		for x in ${boards}; do
+		for x in $boards; do
 			[ -d "config/coreboot/$x/config" ] && \
-				handle_coreboot_target "$x" && continue
-			printf "No configs for %s; skipping\n" "$x"
+				handle_coreboot_target "$x"; continue
 		done
 	fi
 
-	bstr="directories"
-	[ "$xbmk_release" = "y" ] && bstr="tarballs"
+	x="directories"
+	[ "$xbmk_release" = "y" ] && x="archives (remember the inject command)"
 
-	[ -z "${targets}" ] && $err "No ROM images were compiled"
+	[ -z "$targets" ] && $err "No ROM images were compiled"
 	printf "\nROM images available in these %s:\n" "$bstr"
-	eval "printf \"${targets}\""
+	eval "printf \"$targets\""
 	printf "^^ ROM images available in these %s.\n\n" "$bstr"
 
-	[ "$xbmk_release" = "y" ] && \
-		printf "Always run the inject command on release images!\n"
 	printf "DO NOT flash images from elf/ - please use bin/ instead.\n"
 }
 
@@ -79,25 +71,24 @@ handle_serprog()
 {
 	[ -z "${1+x}" ] && $err "bad command. Check $projectname docs."
 	[ "$1" != "rp2040" ] && [ "$1" != "stm32" ] && $err "bad command"
-	if [ "${1}" = "rp2040" ]; then
-		serprog_boards_dir=${pico_sdk_dir}/src/boards/include/boards
-		[ -d "$pico_src_dir" ] || x_ ./update trees -f "pico-serprog"
-	elif [ "${1}" = "stm32" ]; then
-		serprog_boards_dir=${stm32_src_dir}/boards
-		[ -d "$stm32_src_dir" ] || x_ ./update trees -f "stm32-vserprog"
+	if [ "$1" = "rp2040" ]; then
+		serprog_boards_dir="$picosdk/src/boards/include/boards"
+		[ -d "$picosrc" ] || x_ ./update trees -f "pico-serprog"
+	elif [ "$1" = "stm32" ]; then
+		serprog_boards_dir="$stm32src/boards"
+		[ -d "$stm32src" ] || x_ ./update trees -f "stm32-vserprog"
 	fi
-	x_ mkdir -p "bin/serprog_${1}"
+	x_ mkdir -p "bin/serprog_$1"
 
-	if [ $# -gt 1 ] && [ "${2}" = "list" ]; then
-		list_serprog_boards ${serprog_boards_dir}
+	if [ $# -gt 1 ] && [ "$2" = "list" ]; then
+		list_serprog_boards "$serprog_boards_dir"
 		return 0
 	elif [ $# -gt 1 ]; then
-		build_${1}_rom "${2}"
+		build_${1}_rom "$2"
 	else
-		printf "Building all serprog targets\n"
-		list_serprog_boards "${serprog_boards_dir}" | \
+		list_serprog_boards "$serprog_boards_dir" | \
 			while read -r board; do
-				build_${1}_rom "${board}"
+				build_${1}_rom "$board"
 			done
 	fi
 
@@ -106,75 +97,70 @@ handle_serprog()
 
 build_rp2040_rom()
 {
-	board=${1}
-	printf "Building pico-serprog for %s\n" "${board}"
-	x_ cmake -DPICO_BOARD="$board" -DPICO_SDK_PATH="$pico_sdk_dir" \
-	    -B "${pico_src_dir}/build" "${pico_src_dir}"
-	x_ cmake --build "${pico_src_dir}/build"
-	x_ mv ${pico_src_dir}/build/pico_serprog.uf2 \
-	   bin/serprog_rp2040/serprog_${board}.uf2
+	board="$1"
+	printf "Building pico-serprog for %s\n" "$board"
+	x_ cmake -DPICO_BOARD="$board" -DPICO_SDK_PATH="$picosdk" \
+	    -B "$picosrc/build" "$picosrc"
+	x_ cmake --build "$picosrc/build"
+	x_ mv "$picosrc/build/pico_serprog.uf2" \
+	   "bin/serprog_rp2040/serprog_$board.uf2"
 	printf "output to bin/serprog_rp2040/serprog_%s.uf2\n" "$board"
 }
 
 build_stm32_rom()
 {
-	board=${1}
-	printf "Building stm32-vserprog for %s\n" "${board}"
-	x_ make -C $stm32_src_dir libopencm3-just-make BOARD=$board
-	x_ make -C ${stm32_src_dir} BOARD=${board}
-	x_ mv ${stm32_src_dir}/stm32-vserprog.hex \
-	   bin/serprog_stm32/serprog_${board}.hex
+	board="$1"
+	printf "Building stm32-vserprog for %s\n" "$board"
+	x_ make -C "$stm32src" libopencm3-just-make BOARD=$board
+	x_ make -C "$stm32src" BOARD=$board
+	x_ mv "$stm32src/stm32-vserprog.hex" \
+	   "bin/serprog_stm32/serprog_$board.hex"
 	printf "output to bin/serprog_stm32/serprog_%s.hex\n" "$board"
 }
 
 list_serprog_boards()
 {
-	basename -a -s .h "${1}/"*.h || $err "list_boards $1: can't list boards"
+	basename -a -s .h "$1/"*.h || $err "$1: can't list boards"
 }
 
 handle_coreboot_target()
 {
-	eval "$(setvars "n" ${pv}) $(setvars "" ${v})"
+	eval "$(setvars "n" $pv) $(setvars "" $v)"
 	grub_background="background1280x800.png"
 	board="$1"
 
 	configure_target
 	[ "$board" = "$tree" ] && return 0
-	if [ "$xbmk_release" = "y" ] && [ "$release" = "n" ]; then
-		printf "Target '%s' disabled for release.\n" "$board"
-		return 0
-	fi
+	[ "$xbmk_release" = "y" ] && [ "$release" = "n" ] && return 0
 
 	build_payloads
 	build_target_mainboard
 
-	[ -d "bin/${board}" ] || return 0
-	[ "$xbmk_release" = "y" ] || targets="* bin/${board}\n${targets}"
+	[ -d "bin/$board" ] || return 0
+	[ "$xbmk_release" = "y" ] || targets="* bin/$board\n$targets"
 	[ "$xbmk_release" = "y" ] && mkrom_tarball "bin/$board" && \
-	targets="* bin/${relname}_$board.tar.xz\n$targets"; return 0
+	    targets="* bin/${relname}_$board.tar.xz\n$targets"; return 0
 }
 
 configure_target()
 {
-	targetdir="${cfgsdir}/${board}"
-	[ -f "${targetdir}/target.cfg" ] || \
-		$err "Missing target.cfg for target: ${board}"
+	targetdir="$cfgsdir/$board"
+	[ -f "$targetdir/target.cfg" ] || $err "$board: target.cfg missing"
 
 	# Override the above defaults using target.cfg
-	. "${targetdir}/target.cfg"
+	. "$targetdir/target.cfg"
 
-	[ -z "${grub_scan_disk}" ] && grub_scan_disk="both"
-	[ "$grub_scan_disk" != "both" ] && [ "$grub_scan_disk" != "ata" ] \
-	    && [ "${grub_scan_disk}" != "ahci" ] && \
-		grub_scan_disk="both"
+	[ -z "$grub_scan_disk" ] && grub_scan_disk="both"
+	[ "$grub_scan_disk" != "both" ] && [ "$grub_scan_disk" != "ata" ] && \
+	    [ "$grub_scan_disk" != "ahci" ] && grub_scan_disk="both"
 
 	[ -z "$tree" ] && $err "$board: tree not defined"
 
-	[ "${payload_memtest}" != "y" ] && payload_memtest="n"
+	[ "$payload_memtest" != "y" ] && payload_memtest="n"
 	[ "$(uname -m)" = "x86_64" ] || payload_memtest="n"
 
-	[ "${payload_grub_withseabios}" = "y" ] && payload_grub="y"
-	[ "${payload_grub_withseabios}" = "y" ] && \
+	[ "$payload_grub_withseabios" = "y" ] && payload_grub="y"
+	[ "$payload_grub_withseabios" = "y" ] && \
 		eval "$(setvars "y" payload_seabios payload_seabios_withgrub)"
 	[ "$payload_seabios_withgrub" = "y" ] && payload_seabios="y"
 	[ "$payload_seabios_grubonly" = "y" ] && payload_seabios="y"
@@ -183,8 +169,7 @@ configure_target()
 	# The reverse logic must not be applied. If SeaBIOS-with-GRUB works,
 	# that doesn't mean GRUB-with-SeaBIOS will, e.g. VGA ROM execution
 	[ "$payload_grub" != "y" ] && [ "$payload_seabios" != "y" ] && \
-	    [ "${payload_uboot}" != "y" ] && \
-		$err "target '$board' defines no payload"
+	    [ "$payload_uboot" != "y" ] && $err "'$board' defines no payload"
 
 	[ "$payload_uboot" != "n" ] && [ "$payload_uboot" != "y" ] && \
 		payload_uboot="n"
@@ -192,32 +177,32 @@ configure_target()
 		uboot_config="default"
 
 	# Override all payload directives with cmdline args
-	[ -z "${_payload}" ] && return 0
+	[ -z "$_payload" ] && return 0
 	eval "$(setvars "n" payload_grub payload_memtest payload_seabios \
 	    payload_seabios_withgrub payload_uboot payload_grub_withseabios \
 	    payload_seabios_grubonly)"
-	eval "payload_${_payload}=y"
+	eval "payload_$_payload=y"
 }
 
 build_payloads()
 {
-	romdir="bin/${board}"
-	cbdir="src/coreboot/${board}"
-	[ "${board}" = "${tree}" ] || cbdir="src/coreboot/${tree}"
-	cbfstool="cbutils/${tree}/cbfstool"
-	cbrom="${cbdir}/build/coreboot.rom"
+	romdir="bin/$board"
+	cbdir="src/coreboot/$board"
+	[ "$board" = "$tree" ] || cbdir="src/coreboot/$tree"
+	cbfstool="cbutils/$tree/cbfstool"
+	cbrom="$cbdir/build/coreboot.rom"
 
 	[ -f "$cbfstool" ] || x_ ./update trees -b coreboot utils $tree
 
-	memtest_bin="memtest86plus/build64/memtest.bin"
-	[ "${payload_memtest}" != "y" ] || [ -f "src/${memtest_bin}" ] || \
+	mt86bin="memtest86plus/build64/memtest.bin"
+	[ "$payload_memtest" != "y" ] || [ -f "src/$mt86bin" ] || \
 		x_ ./update trees -b memtest86plus
 
 	[ "$payload_seabios" = "y" ] && x_ ./update trees -b seabios
 	if [ "$payload_grub" = "y" ] || [ "$payload_seabios_withgrub" = "y" ] \
 	    || [ "$payload_seabios_grubonly" = "y" ]; then build_grub_payload
 	fi
-	[ "${payload_uboot}" = "y" ] && build_uboot_payload; return 0
+	[ "$payload_uboot" = "y" ] && build_uboot_payload; return 0
 }
 
 build_grub_payload()
@@ -225,227 +210,215 @@ build_grub_payload()
 	x_ mkdir -p elf/grub
 
 	for keymapfile in config/grub/keymap/*.gkb; do
-		[ -f "${keymapfile}" ] || continue
-
-		keymaps="${keymaps} ${keymapfile}"
+		[ -f "$keymapfile" ] && keymaps="$keymaps $keymapfile"
 	done
 	[ -z "$_keyboard" ] || [ -f "$grubcfgsdir/keymap/$_keyboard.gkb" ] || \
 		$err "build_grub_payload: $_keyboard layout not defined"
-	[ -n "$_keyboard" ] && keymaps="${grubcfgsdir}/keymap/${_keyboard}.gkb"
+	[ -n "$_keyboard" ] && keymaps="$grubcfgsdir/keymap/$_keyboard.gkb"
 	[ -f "$grubelf" ] && return 0
 	[ -f "src/grub/grub-mkstandalone" ] || x_ ./update trees -b grub
 
 	./src/grub/grub-mkstandalone --grub-mkimage="src/grub/grub-mkimage" \
 	    -O i386-coreboot -o "elf/grub/grub.elf" -d "src/grub/grub-core/" \
-	    --fonts= --themes= --locales=  --modules="${grub_modules}" \
-	    --install-modules="${grub_install_modules}" \
-	    "/boot/grub/grub.cfg=${grubcfgsdir}/config/grub_memdisk.cfg" \
-	    "/boot/grub/grub_default.cfg=${grubcfgsdir}/config/grub.cfg" || \
+	    --fonts= --themes= --locales=  --modules="$grub_modules" \
+	    --install-modules="$grub_install_modules" \
+	    "/boot/grub/grub.cfg=$grubcfgsdir/config/grub_memdisk.cfg" \
+	    "/boot/grub/grub_default.cfg=$grubcfgsdir/config/grub.cfg" || \
 	    $err "could not generate grub.elf"
 }
 
 build_uboot_payload()
 {
-	x_ ./update trees -b u-boot ${board}
-	ubdir="elf/u-boot/${board}/${uboot_config}"
-	ubootelf="${ubdir}/u-boot.elf"
-	[ ! -f "${ubootelf}" ] && [ -f "${ubdir}/u-boot" ] && \
-		ubootelf="${ubdir}/u-boot"
-	[ -f "${ubootelf}" ] || $err "$board: Can't find u-boot"; return 0
+	x_ ./update trees -b u-boot $board
+	ubdir="elf/u-boot/$board/$uboot_config"
+	ubootelf="$ubdir/u-boot.elf"
+	[ ! -f "$ubootelf" ] && [ -f "$ubdir/u-boot" ] && \
+		ubootelf="$ubdir/u-boot"
+	[ -f "$ubootelf" ] || $err "$board: Can't find u-boot"; return 0
 }
 
 build_target_mainboard()
 {
-	x_ rm -Rf "${romdir}"
+	x_ rm -Rf "$romdir"
 
 	for x in "normal" "vgarom" "libgfxinit"; do
-		initmode="${x}"
+		initmode="$x"
 		hmode="vesafb"
-		[ "${initmode}" = "vgarom" ] || hmode="corebootfb"
-		modes="${hmode} txtmode"
-		[ -z "${_displaymode}" ] || modes="${_displaymode}"
-		for y in ${modes}; do
-			displaymode="${y}"
-			[ "${initmode}" = "normal" ] && \
+		[ "$initmode" = "vgarom" ] || hmode="corebootfb"
+		modes="$hmode txtmode"
+		[ -z "$_displaymode" ] || modes="$_displaymode"
+		for y in $modes; do
+			displaymode="$y"
+			[ "$initmode" = "normal" ] && \
 			    [ "$displaymode" != "txtmode" ] && continue
-			cbcfg="${targetdir}/config/${initmode}_${displaymode}"
-			[ "${initmode}" = "normal" ] && cbcfg="${cbcfg%_*}"
-			build_roms "${cbcfg}"
-			x_ rm -f "$cbrom"
+			cbcfg="$targetdir/config/${initmode}_$displaymode"
+			[ "$initmode" = "normal" ] && cbcfg="${cbcfg%_*}"
+			build_roms "$cbcfg"; x_ rm -f "$cbrom"
 		done
 	done
 }
 
 build_roms()
 {
-	cbcfg="${1}"
-	if [ ! -f "${cbcfg}" ]; then
-		printf "'%s' does not exist. Skipping build for %s %s %s\n" \
-		    "$cbcfg" "$board" "$displaymode" "$initmode" 1>&2
-		return 0
-	fi
+	cbcfg="$1"
+	e "$cbcfg" f not && return 0
 
-	x_ ./update trees -b coreboot ${board}
+	x_ ./update trees -b coreboot $board
 
 	_cbrom="elf/coreboot_nopayload_DO_NOT_FLASH"
-	_cbrom="${_cbrom}/${board}/${initmode}_${displaymode}"
-	[ "${initmode}" = "normal" ] && \
-		_cbrom="${_cbrom%"_${displaymode}"}"
-	_cbrom="${_cbrom}/coreboot.rom"
+	_cbrom="$_cbrom/$board/${initmode}_$displaymode"
+	[ "$initmode" = "normal" ] && _cbrom="${_cbrom%"_$displaymode"}"
+	_cbrom="$_cbrom/coreboot.rom"
 	cbrom="$(mktemp -t coreboot_rom.XXXXXXXXXX)"
-	x_ cp "${_cbrom}" "${cbrom}"
+	x_ cp "$_cbrom" "$cbrom"
 
-	[ "${payload_memtest}" != "y" ] || \
-		x_ "${cbfstool}" "${cbrom}" add-payload \
-		    -f "src/${memtest_bin}" -n img/memtest -c lzma
-	[ "${payload_seabios}" = "y" ] && build_seabios_roms
+	[ "$payload_memtest" != "y" ] || x_ "$cbfstool" "$cbrom" add-payload \
+	    -f "src/$mt86bin" -n img/memtest -c lzma
+	[ "$payload_seabios" = "y" ] && build_seabios_roms
 	[ "$payload_grub" != "y" ] || x_ build_grub_roms "$cbrom" "grub"
-	[ "${payload_uboot}" = "y" ] || return 0
-	x_ cp "${_cbrom}" "${cbrom}"
+	[ "$payload_uboot" = "y" ] || return 0
+	x_ cp "$_cbrom" "$cbrom"
 	build_uboot_roms
 }
 
 build_seabios_roms()
 {
-	if [ "${payload_seabios_withgrub}" = "y" ]; then
-		t=$(mktemp -t coreboot_rom.XXXXXXXXXX)
-		x_ cp "${cbrom}" "${t}"
-		x_ build_grub_roms "${t}" "seabios_withgrub"
+	if [ "$payload_seabios_withgrub" = "y" ]; then
+		t="$(mktemp -t coreboot_rom.XXXXXXXXXX)"
+		x_ cp "$cbrom" "$t"
+		x_ build_grub_roms "$t" "seabios_withgrub"
 	else
-		t=$(mkSeabiosRom "${cbrom}" "fallback/payload") || \
+		t="$(mkSeabiosRom "$cbrom" "fallback/payload")" || \
 		    $err "build_seabios_roms: cannot build tmprom"
-		newrom="${romdir}/seabios_${board}_${initmode}_${displaymode}"
-		[ "${initmode}" = "normal" ] && newrom="${romdir}/seabios" \
-			&& newrom="${newrom}_${board}_${initmode}"
-		x_ copyrom "${t}" "${newrom}.rom"
+		newrom="$romdir/seabios_${board}_${initmode}_$displaymode"
+		[ "$initmode" = "normal" ] && newrom="$romdir/seabios" \
+			&& newrom="${newrom}_${board}_$initmode"
+		x_ cprom "$t" "$newrom.rom"
 	fi
-	x_ rm -f "${t}"
+	x_ rm -f "$t"
 }
 
 # Make separate ROM images with GRUB payload, for each supported keymap
 build_grub_roms()
 {
-	tmprom="${1}"
-	payload1="${2}" # allow values: grub, seabios, seabios_withgrub
+	tmprom="$1"
+	payload1="$2" # allow values: grub, seabios, seabios_withgrub
 
 	grub_cbfs="fallback/payload"
 	if [ "$payload1" = "grub" ] && [ "$payload_grub_withseabios" = "y" ]
 	then
-		_tmpmvrom=$(mkSeabiosRom "$tmprom" "seabios.elf") || \
+		_tmpmvrom="$(mkSeabiosRom "$tmprom" "seabios.elf")" || \
 		    $err "build_grub_roms 1 $board: can't build tmprom"
 		x_ mv "$_tmpmvrom" "$tmprom"
 	elif [ "$payload1" != "grub" ] && [ "$payload_seabios_withgrub" = "y" ]
 	then
 		grub_cbfs="img/grub2"
-		_tmpmvrom=$(mkSeabiosRom "$tmprom" fallback/payload) || \
+		_tmpmvrom="$(mkSeabiosRom "$tmprom" fallback/payload)" || \
 		    $err "build_grub_roms 2 $board: can't build tmprom"
 		x_ mv "$_tmpmvrom" "$tmprom"
 	fi
 
 	# we only need insert grub.elf once, for each coreboot config:
-	x_ "${cbfstool}" "${tmprom}" add-payload -f "${grubelf}" \
-	    -n ${grub_cbfs} -c lzma
+	x_ "$cbfstool" "$tmprom" add-payload -f "$grubelf" \
+	    -n "$grub_cbfs" -c lzma
 
 	# we only need insert background.png once, for each coreboot config:
-	if [ "${displaymode}" = "vesafb" ] || \
-	    [ "${displaymode}" = "corebootfb" ]; then
-		backgroundfile="config/grub/background/${grub_background}"
-		"${cbfstool}" "${tmprom}" add -f ${backgroundfile} \
-		    -n background.png -t raw || \
-		    $err "insert background, ${backgroundfile}"
+	if [ "$displaymode" = "vesafb" ] || \
+	    [ "$displaymode" = "corebootfb" ]; then
+		backgroundfile="config/grub/background/$grub_background"
+		"$cbfstool" "$tmprom" add -f "$backgroundfile" -n \
+		    background.png -t raw || $err "!bg, $backgroundfile"
 	fi
 
-	tmpcfg=$(mktemp -t coreboot_rom.XXXXXXXXXX)
-	printf "set grub_scan_disk=\"%s\"\n" "$grub_scan_disk" >"$tmpcfg" \
-	    || $err "set grub_scandisk, $grub_scan_disk, $tmpcfg"
-	[ "${grub_scan_disk}" = "both" ] || \
+	tmpcfg="$(mktemp -t coreboot_rom.XXXXXXXXXX)"
+	printf "set grub_scan_disk=\"%s\"\n" "$grub_scan_disk" > "$tmpcfg" || \
+	    $err "set grub_scandisk, $grub_scan_disk, $tmpcfg"
+	[ "$grub_scan_disk" = "both" ] || \
 	    x_ "$cbfstool" "$tmprom" add -f "$tmpcfg" -n scan.cfg -t raw
-	printf "set timeout=%s\n" "${grub_timeout}" > "${tmpcfg}" || \
-	    $err "set timeout, ${grub_timeout}, ${tmpcfg}"
-	[ -z "${grub_timeout}" ] || x_ "${cbfstool}" "${tmprom}" add \
-	    -f "${tmpcfg}" -n timeout.cfg -t raw
-	x_ rm -f "${tmpcfg}"
+	printf "set timeout=%s\n" "$grub_timeout" > "$tmpcfg" || \
+	    $err "set timeout, $grub_timeout, $tmpcfg"
+	[ -z "$grub_timeout" ] || x_ "$cbfstool" "$tmprom" add \
+	    -f "$tmpcfg" -n timeout.cfg -t raw
+	x_ rm -f "$tmpcfg"
 
-	for keymapfile in ${keymaps}; do
-		[ -f "${keymapfile}" ] || continue
+	for keymapfile in $keymaps; do
+		[ -f "$keymapfile" ] || continue
 		keymap="${keymapfile##*/}"
 		keymap="${keymap%.gkb}"
 
 		tmpgrubrom="$(mktemp -t coreboot_rom.XXXXXXXXXX)"
-		x_ cp "${tmprom}" "${tmpgrubrom}"
+		x_ cp "$tmprom" "$tmpgrubrom"
 		x_ "$cbfstool" "$tmpgrubrom" add -f "$keymapfile" \
 		    -n keymap.gkb -t raw
 
-		newrom="${romdir}/${payload1}_${board}_${initmode}_"
-		newrom="${newrom}${displaymode}_${keymap}.rom"
-		[ "${initmode}" = "normal" ] && \
-			newrom="${romdir}/${payload1}_${board}_" && \
-			newrom="${newrom}${initmode}_${keymap}.rom"
-		x_ copyrom "${tmpgrubrom}" "${newrom}"
-		if [ "${payload_seabios_grubonly}" = "y" ]; then
+		newrom="$romdir/${payload1}_${board}_${initmode}_"
+		newrom="$newrom${displaymode}_$keymap.rom"
+		[ "$initmode" = "normal" ] && newrom="$romdir/${payload1}_" \
+		    && newrom="$newrom${board}_${initmode}_$keymap.rom"
+		x_ cprom "$tmpgrubrom" "$newrom"
+		if [ "$payload_seabios_grubonly" = "y" ]; then
 			x_ "$cbfstool" "$tmpgrubrom" add \
 			    -f "config/grub/bootorder" -n bootorder -t raw
-			x_ copyrom "$tmpgrubrom" "${newrom%.rom}_grubfirst.rom"
+			x_ cprom "$tmpgrubrom" "${newrom%.rom}_grubfirst.rom"
 			x_ "$cbfstool" "$tmpgrubrom" add-int -i 0 \
 			    -n etc/show-boot-menu
-			x_ copyrom "$tmpgrubrom" "${newrom%.rom}_grubonly.rom"
+			x_ cprom "$tmpgrubrom" "${newrom%.rom}_grubonly.rom"
 		fi
-		x_ rm -f "${tmpgrubrom}"
+		x_ rm -f "$tmpgrubrom"
 	done
 }
 
 # make a rom in /tmp/ and then print the path of that ROM
 mkSeabiosRom() {
-	_cbrom="${1}" # rom to insert seabios in. will not be touched
+	_cbrom="$1" # rom to insert seabios in. will not be touched
 		# (a tmpfile will be made instead)
-	_seabios_cbfs_path="${2}" # e.g. fallback/payload
-	_seabioself="elf/seabios/default/${initmode}/bios.bin.elf"
-	tmprom=$(mktemp -t coreboot_rom.XXXXXXXXXX)
+	_seabios_cbfs_path="$2" # e.g. fallback/payload
+	_seabioself="elf/seabios/default/$initmode/bios.bin.elf"
+	tmprom="$(mktemp -t coreboot_rom.XXXXXXXXXX)"
 
-	x_ cp "${_cbrom}" "${tmprom}"
+	x_ cp "$_cbrom" "$tmprom"
 	x_ "$cbfstool" "$tmprom" add-payload -f "$_seabioself" \
-	    -n "${_seabios_cbfs_path}" -c lzma
+	    -n "$_seabios_cbfs_path" -c lzma
 	x_ "$cbfstool" "$tmprom" add-int -i 3000 -n etc/ps2-keyboard-spinup
 
 	z="2"; [ "$initmode" = "vgarom" ] && z="0"
 	x_ "$cbfstool" "$tmprom" add-int -i $z -n etc/pci-optionrom-exec
 	x_ "$cbfstool" "$tmprom" add-int -i 0 -n etc/optionroms-checksum
-	[ "$initmode" != "libgfxinit" ] || \
-		x_ "$cbfstool" "$tmprom" add -f "$seavgabiosrom" \
-		    -n vgaroms/seavgabios.bin -t raw
+	[ "$initmode" != "libgfxinit" ] || x_ "$cbfstool" "$tmprom" add -f \
+	    "$seavgabiosrom" -n vgaroms/seavgabios.bin -t raw
 
-	printf "%s\n" "${tmprom}"
+	printf "%s\n" "$tmprom"
 }
 
 build_uboot_roms()
 {
-	tmprom=$(mkUbootRom "${cbrom}" "fallback/payload") || \
+	tmprom="$(mkUbootRom "$cbrom" "fallback/payload")" || \
 	    $err "build_uboot_roms $board: could not create tmprom"
-	newrom="${romdir}/uboot_payload_${board}_${initmode}_${displaymode}.rom"
-	x_ copyrom "${tmprom}" "${newrom}"
-	x_ rm -f "${tmprom}"
+	newrom="$romdir/uboot_payload_${board}_${initmode}_$displaymode.rom"
+	x_ cprom "$tmprom" "$newrom"
+	x_ rm -f "$tmprom"
 }
 
 # make a rom in /tmp/ and then print the path of that ROM
 mkUbootRom() {
-	_cbrom="${1}"
-	_uboot_cbfs_path="${2}"
+	_cbrom="$1"
+	_uboot_cbfs_path="$2"
 
-	_ubdir="elf/u-boot/${board}/${uboot_config}"
-	_ubootelf="${_ubdir}/u-boot.elf"
-	[ -f "${_ubootelf}" ] || _ubootelf="${_ubdir}/u-boot"
+	_ubdir="elf/u-boot/$board/$uboot_config"
+	_ubootelf="$_ubdir/u-boot.elf"
+	[ -f "$_ubootelf" ] || _ubootelf="$_ubdir/u-boot"
 	[ -f "$_ubootelf" ] || $err "mkUbootRom: $board: cant find u-boot"
 
-	tmprom=$(mktemp -t coreboot_rom.XXXXXXXXXX)
+	tmprom="$(mktemp -t coreboot_rom.XXXXXXXXXX)"
 
-	x_ cp "${_cbrom}" "${tmprom}"
+	x_ cp "$_cbrom" "$tmprom"
 	x_ "$cbfstool" "$tmprom" add-payload -f "$_ubootelf" \
-	    -n "${_uboot_cbfs_path}" -c lzma
+	    -n "$_uboot_cbfs_path" -c lzma
 
-	printf "%s\n" "${tmprom}"
+	printf "%s\n" "$tmprom"
 }
 
-copyrom()
+cprom()
 {
 	printf "Creating target image: %s\n" "$2"
 
diff --git a/script/trees b/script/trees
index 4f9207c..72c95b4 100755
--- a/script/trees
+++ b/script/trees
@@ -1,8 +1,8 @@
 #!/usr/bin/env sh
 # SPDX-License-Identifier: GPL-3.0-or-later
-# SPDX-FileCopyrightText: 2022-2023 Alper Nebi Yasak <alpernebiyasak@gmail.com>
-# SPDX-FileCopyrightText: 2022 Ferass El Hafidi <vitali64pmemail@protonmail.com>
-# SPDX-FileCopyrightText: 2023-2024 Leah Rowe <leah@libreboot.org>
+# Copyright (c) 2022-2023 Alper Nebi Yasak <alpernebiyasak@gmail.com>
+# Copyright (c) 2022 Ferass El Hafidi <vitali64pmemail@protonmail.com>
+# Copyright (c) 2023-2024 Leah Rowe <leah@libreboot.org>
 
 set -u -e
 
@@ -10,15 +10,15 @@ set -u -e
 . "include/git.sh"
 . "include/deblob.sh"
 
-eval "$(setvars "" xarch cfgsdir codedir config config_name xlang mode \
-    elfdir listfile project target target_dir targets tree _f target1 \
-    bootstrapargs autoconfargs cmakedir makeargs autogenargs xtree)"
+eval "$(setvars "" xarch cfgsdir cdir config config_name xlang mode makeargs \
+    listfile project target target_dir targets tree _f target1 bootstrapargs \
+    autoconfargs cmakedir elfdir autogenargs xtree)"
 
 main()
 {
 	while getopts f:b:m:u:c:x:s:l:n: option; do
-		_f="${1}"
-		case "${1}" in
+		_f="$1"
+		case "$1" in
 		-b) : ;;
 		-u) mode="oldconfig" ;;
 		-m) mode="menuconfig" ;;
@@ -34,13 +34,13 @@ main()
 	done
 	[ -z "$_f" ] && $err "missing flag (-m/-u/-b/-c/-x/-f/-s/-l/-n)"
 	[ -z "$project" ] && $err "project name not specified"
-	elfdir="elf/${project}"
-	cfgsdir="config/${project}"
+	elfdir="elf/$project"
+	cfgsdir="config/$project"
 
 	remkdir "${tmpgit%/*}"
 
 	_cmd="build_projects"
-	[ -f "config/${project}/build.list" ] && _cmd="build_targets"
+	[ -f "config/$project/build.list" ] && _cmd="build_targets"
 	$_cmd $@
 }
 
@@ -53,8 +53,8 @@ build_projects()
 
 	load_project_config "$cfgsdir"
 
-	codedir="src/${project}"
-	[ -d "$codedir" ] || x_ ./update trees -f "$project"
+	cdir="src/${project}"
+	[ -d "$cdir" ] || x_ ./update trees -f "$project"
 
 	[ "$mode" = "distclean" ] && mode="clean"
 	run_make_command || return 0
@@ -67,15 +67,13 @@ build_targets()
 
 	[ -d "$cfgsdir" ] || $err "directory, $cfgsdir, does not exist"
 
-	listfile="${cfgsdir}/build.list"
+	listfile="$cfgsdir/build.list"
 	[ -f "$listfile" ] || $err "list file, $listfile, does not exist"
 
 	# Build for all targets if no argument is given
 	[ $# -gt 0 ] && target1="$1"
-	[ "$target1" = "utils" ] && [ "$project" = "coreboot" ] && \
-		shift 1
-	targets=$(items "$cfgsdir") || \
-	    $err "Cannot get options for $cfgsdir"
+	[ "$target1" = "utils" ] && [ "$project" = "coreboot" ] && shift 1
+	targets="$(items "$cfgsdir")" || $err "Can't get options for $cfgsdir"
 	[ $# -gt 0 ] && targets=$@
 
 	[ -z "$mode" ] && x_ mkdir -p "$elfdir"
@@ -85,14 +83,13 @@ build_targets()
 handle_targets()
 {
 	for x in $targets; do
-		target="${x}"
-		printf "Running 'make %s' for project '%s, target '%s''\n" \
-		    "$mode" "$project" "$target"
+		target="$x"
+		printf "'make %s', '%s', '%s'\n" "$mode" "$project" "$target"
 		x_ handle_defconfig
 	done
 
 	[ "$target1" = "utils" ] && [ "$project" = "coreboot" ] && return 0
-	[ -z "${mode}" ] && printf "Done! Check  %s/\n\n" "$elfdir"; return 0
+	[ -z "$mode" ] && printf "Done! Check  %s/\n\n" "$elfdir"; return 0
 }
 
 handle_defconfig()
@@ -102,13 +99,10 @@ handle_defconfig()
 	[ "$target1" = "utils" ] && [ "$project" = "coreboot" ] && \
 		eval "handle_coreboot_utils \"$tree\"; return 0"
 
-	for y in "${target_dir}/config"/*; do
+	for y in "$target_dir/config"/*; do
 		[ -f "$y" ] || continue
 		config="$y"
-		config_name="${config#"${target_dir}/config/"}"
-
-		printf "handle/make/config %s %s: handling config %s\n" \
-		    "$project" "$target" "$config_name"
+		config_name="${config#"$target_dir/config/"}"
 
 		[ -n "$mode" ] || check_config || continue
 		handle_makefile
@@ -118,23 +112,20 @@ handle_defconfig()
 
 handle_src_tree()
 {
-	target_dir="${cfgsdir}/${target}"
+	target_dir="$cfgsdir/$target"
 	[ "$mode" = "fetch" ] && [ ! -f "CHANGELOG" ] && \
 		eval "fetch_project_trees; return 1;"
 
 	load_project_config "$target_dir"
-
-	x_ mkdir -p "${elfdir}/${target}"
+	x_ mkdir -p "$elfdir/$target"
 
 	[ -z "$tree" ] && $err "handle_src_tree $project/$tree: tree unset"
+	cdir="src/$project/$tree"
 
-	codedir="src/${project}/${tree}"
-
-	if [ ! -d "$codedir" ]; then
+	if [ ! -d "$cdir" ]; then
 		if [ "$mode" = "distclean" ] || \
 		    [ "$mode" = "crossgcc-clean" ]; then
-			printf "Directory %s missing; skipping clean\n" \
-			    "$codedir" 1>&2
+			printf "Directory %s missing; skip\n" "$cdir" 1>&2
 			return 1
 		fi
 		x_ ./update trees -f "$project" "$target"
@@ -146,28 +137,27 @@ handle_src_tree()
 
 load_project_config()
 {
-	eval "$(setvars "" xarch xlang tree bootstrapargs autoconfargs \
-	    xtree tree_depend makeargs)"
+	eval "$(setvars "" xarch xlang tree bootstrapargs autoconfargs xtree \
+	    tree_depend makeargs)"
 
-	[ -f "${1}/target.cfg" ] || return 0
-	. "${1}/target.cfg" || \
-	    $err "load_project_config ${1}: cannot load target.cfg"; return 0
+	[ -f "$1/target.cfg" ] || return 0
+	. "$1/target.cfg" || $err "loadp $1: can't load target.cfg"; return 0
 }
 
 check_cross_compiler()
 {
 	for _xarch in $xarch; do
-		cbdir="src/coreboot/${tree}"
+		cbdir="src/coreboot/$tree"
 		[ "$project" != "coreboot" ] && cbdir="src/coreboot/default"
 		[ -n "$xtree" ] && cbdir="src/coreboot/$xtree"
 
 		x_ ./update trees -f coreboot ${cbdir#src/coreboot/}
 
-		export PATH="${PWD}/${cbdir}/util/crossgcc/xgcc/bin:$PATH"
+		export PATH="$PWD/$cbdir/util/crossgcc/xgcc/bin:$PATH"
 		export CROSS_COMPILE="${xarch% *}-"
-		[ -n "${xlang}" ] && export BUILD_LANGUAGES="$xlang"
+		[ -n "$xlang" ] && export BUILD_LANGUAGES="$xlang"
 
-		[ -d "${cbdir}/util/crossgcc/xgcc/${_xarch}/" ] && continue
+		[ -d "$cbdir/util/crossgcc/xgcc/$_xarch/" ] && continue
 		x_ make -C "$cbdir" crossgcc-${_xarch%-*} CPUS=$threads \
 		    UPDATED_SUBMODULES=1
 	done
@@ -175,89 +165,78 @@ check_cross_compiler()
 
 check_config()
 {
-	[ -f "$config" ] || $err "check_config: ${project}/${target}: no config"
+	[ -f "$config" ] || $err "check_config $project/$target: no config"
 
-	dest_dir="${elfdir}/${target}/${config_name}"
+	dest_dir="$elfdir/$target/$config_name"
 	# TODO: very hacky check. do it properly (based on build.list)
-	for elftest in "${dest_dir}"/*; do
-		[ -f "$elftest" ] || continue
-		printf "Build already exists, so skipping build\n" 1>&2
-		return 1
+	for elftest in "$dest_dir"/*; do
+		e "$elftest" f && return 1
 	done
 	x_ mkdir -p "$dest_dir"
 }
 
 handle_makefile()
 {
-	x_ make clean -C "$codedir"
-	x_ cp "$config" "${codedir}/.config"
-	[ -n "$mode" ] || make -C "$codedir" silentoldconfig || \
-	    make -C "$codedir" oldconfig || :
+	x_ make clean -C "$cdir" && x_ cp "$config" "$cdir/.config"
+	[ -n "$mode" ] || make -C "$cdir" silentoldconfig || \
+	    make -C "$cdir" oldconfig || :
 
-	run_make_command || $err "handle_makefile $codedir: no makefile!"
+	run_make_command || $err "handle_makefile $cdir: no makefile!"
 
 	_copy=".config"
 	[ "$mode" = "savedefconfig" ] && _copy="defconfig"
-	[ "${mode%config}" = "$mode" ] || x_ cp "$codedir/$_copy" "$config"
+	[ "${mode%config}" = "$mode" ] || x_ cp "$cdir/$_copy" "$config"
 
-	[ -e "${codedir}/.git" ] && [ "$project" = "u-boot" ] && \
-	    [ "$mode" = "distclean" ] && \
-		x_ git -C "$codedir" clean -fdx; return 0
+	[ -e "$cdir/.git" ] && [ "$project" = "u-boot" ] && \
+	    [ "$mode" = "distclean" ] && x_ git -C "$cdir" clean -fdx; return 0
 }
 
 run_make_command()
 {
-	check_cmake "$codedir"
-	[ -z "$mode" ] && check_autoconf "$codedir"
-	check_makefile "$codedir" || return 1
+	check_cmake "$cdir"
+	[ -z "$mode" ] && check_autoconf "$cdir"
+	check_makefile "$cdir" || return 1
 
 	[ "$project" = "coreboot" ] && [ -z "$mode" ] && x_ \
-		printf "%s\n" "${version%%-*}" > "$codedir/.coreboot-version"
+		printf "%s\n" "${version%%-*}" > "$cdir/.coreboot-version" \
+		    && makeargs="$makeargs UPDATED_SUBMODULES=1"
 
-	[ "$project" = "coreboot" ] && \
-		makeargs="$makeargs UPDATED_SUBMODULES=1"
-
-	make -C "$codedir" $mode -j$threads $makeargs || \
-	    $err "run_make $codedir: !make $mode"
+	make -C "$cdir" $mode -j$threads $makeargs || $err "!mk $cdir $mode"
 
 	[ "$mode" != "clean" ] && return 0
-	make -C "$codedir" distclean 2>/dev/null || :
+	make -C "$cdir" distclean 2>/dev/null || :
 }
 
 check_cmake()
 {
-	[ -z "${cmakedir}" ] || \
-		check_makefile "${1}" || \
-		    cmake -B "${1}" "${1}/${cmakedir}" || \
-		    check_makefile "${1}" || \
-		    $err "check_cmake ${1}: can't cmake ${cmakedir}"
-	[ -z "${cmakedir}" ] || check_makefile "${1}" || \
-		$err "check_cmake ${1}: can't generate Makefile"; return 0
+	[ -z "$cmakedir" ] || check_makefile "$1" || cmake -B "$1" \
+	    "$1/$cmakedir" || check_makefile "$1" || $err "$1: !cmk $cmakedir"
+	[ -z "$cmakedir" ] || check_makefile "$1" || \
+		$err "check_cmake $1: can't generate Makefile"; return 0
 }
 
 check_autoconf()
 {
 	(
-	cd "${1}" || $err "!cd $1"
+	cd "$1" || $err "!cd $1"
 	[ -f "bootstrap" ] && x_ ./bootstrap $bootstrapargs
-	[ -f "autogen.sh" ] && x_ ./autogen.sh ${autogenargs}
+	[ -f "autogen.sh" ] && x_ ./autogen.sh $autogenargs
 	[ -f "configure" ] && x_ ./configure $autoconfargs; return 0
 	) || $err "can't bootstrap project: $1"
 }
 
 check_makefile()
 {
-	[ -f "${1}/Makefile" ] || [ -f "${1}/makefile" ] || \
-	    [ -f "${1}/GNUmakefile" ] || return 1; return 0
+	[ -f "$1/Makefile" ] || [ -f "$1/makefile" ] || \
+	    [ -f "$1/GNUmakefile" ] || return 1; return 0
 }
 
 copy_elf()
 {
 	while read -r f; do
-		[ ! -f "${codedir}/$f" ] || \
-			x_ cp "${codedir}/${f}" "$dest_dir"
+		[ -f "$cdir/$f" ] && x_ cp "$cdir/$f" "$dest_dir"
 	done < "$listfile"
-	x_ make clean -C "$codedir"
+	x_ make clean -C "$cdir"
 }
 
 main $@