Greatly simplify error handling in shell scripts

Instead of having detailed error messages, run most
commands through a function that calls err() under
fault conditions.

Where detail is still required, err() is still called
manually. Where it isn't, the error message is simply
whatever command was executed to cause the error.

This results in a massive sloccount reduction for lbmk;
specifically, 178 sloc reduction, or a 8.1% reduction.
The total sloccount is now 2022, for shell scripts.

Signed-off-by: Leah Rowe <leah@libreboot.org>

2 files changed, 51 insertions, 83 deletions

diff --git a/script/build/boot/roms b/script/build/boot/roms
index edecfc6b..48d55e27 100755
--- a/script/build/boot/roms
+++ b/script/build/boot/roms
@@ -41,8 +41,7 @@ build_bootroms()
 {
 	opts="${_displaymode} ${_payload} ${_keyboard}"
 	for x in ${boards}; do
-		./build boot roms_helper ${opts} ${x} || \
-		    err "handle_targets ${opts} ${x}: build error"
+		x_ ./build boot roms_helper ${opts} ${x}
 		[ -d "bin/${x}" ] && targets="${x} ${targets}"
 	done
 }
diff --git a/script/build/boot/roms_helper b/script/build/boot/roms_helper
index 09b08125..2d185b7d 100755
--- a/script/build/boot/roms_helper
+++ b/script/build/boot/roms_helper
@@ -110,16 +110,15 @@ build_dependencies()
 	cbfstool="cbutils/${tree}/cbfstool"
 	cbrom="${cbdir}/build/coreboot.rom"
 
-	./build coreboot utils ${tree} || err "cannot build cbutils/${tree}"
+	x_ ./build coreboot utils ${tree}
 
 	build_dependency_seabios
 
 	memtest_bin="memtest86plus/build${arch#*_}/memtest.bin"
 	[ "${payload_memtest}" != "y" ] || [ -f "${memtest_bin}" ] || \
-		./handle make file -b ${memtest_bin%/*} || \
-		    err "cannot build memtest86+"
+		x_ ./handle make file -b ${memtest_bin%/*}
 
-	rm -f "${romdir}"/* || err "cannot: rm -f \"${romdir}\"/*"
+	x_ rm -f "${romdir}/"*
 
 	build_dependency_grub
 	build_dependency_uboot
@@ -133,8 +132,7 @@ build_dependency_seabios()
 	    || [ ! -f elf/seabios/default/libgfxinit/bios.bin.elf ] \
 	    || [ ! -f elf/seabios/default/vgarom/bios.bin.elf ] \
 	    || [ ! -f elf/seabios/default/normal/bios.bin.elf ]; then
-		./handle make config -b seabios || \
-		    err "cannot build seabios"
+		x_ ./handle make config -b seabios
 	fi
 }
 
@@ -155,16 +153,14 @@ build_dependency_grub()
 		    rebuild_grub="y" && break
 	done
 	[ "${rebuild_grub}" = "y" ] || return 0
-	./build grub payload || \
-	    err "build_dependency_grub: cannot build grub payload"
+	x_ ./build grub payload
 }
 
 build_dependency_uboot()
 {
 	[ "${payload_uboot}" = "y" ] || return 0
 
-	./handle make config -b u-boot ${board} || \
-	    err "cannot build u-boot target: ${board}"
+	x_ ./handle make config -b u-boot ${board}
 	ubdir="elf/u-boot/${board}/${uboot_config}"
 	ubootelf="${ubdir}/u-boot.elf"
 	[ ! -f "${ubootelf}" ] && [ -f "${ubdir}/u-boot.bin" ] && \
@@ -187,7 +183,7 @@ build_target()
 			    [ "$displaymode" != "txtmode" ] && continue
 			cbcfg="${targetdir}/config/${initmode}_${displaymode}"
 			[ "${initmode}" = "normal" ] && cbcfg="${cbcfg%_*}"
-			build_roms "${cbcfg}"
+			build_roms "${cbcfg}"	
 		done
 	done
 }
@@ -201,26 +197,22 @@ build_roms()
 		    "${cbcfg}" "${board}" "${displaymode}" "${initmode}" \
 		    1>&2 && return 0
 
-	./handle make config -b coreboot ${board} || \
-	    err "build_roms: cannot build coreboot for target: ${board}"
+	x_ ./handle make config -b coreboot ${board}
 
 	_cbrom="elf/coreboot/${board}/${initmode}_${displaymode}"
 	[ "${initmode}" = "normal" ] && \
 		_cbrom="${_cbrom%_${displaymode}}"
 	_cbrom="${_cbrom}/coreboot.rom"
 	cbrom="$(mktemp -t coreboot_rom.XXXXXXXXXX)"
-	cp "${_cbrom}" "${cbrom}" || \
-	    err "build_roms: cannot copy rom"
+	x_ cp "${_cbrom}" "${cbrom}"
 
 	[ "${payload_memtest}" != "y" ] || \
-		"${cbfstool}" "${cbrom}" add-payload \
-		    -f "${memtest_bin}" -n img/memtest -c lzma || \
-		    err "build_roms: cannot add img/memtest to coreboot rom"
+		x_ "${cbfstool}" "${cbrom}" add-payload \
+		    -f "${memtest_bin}" -n img/memtest -c lzma
 	[ "${payload_seabios}" = "y" ] && \
 		build_seabios_roms
 	[ "${payload_grub}" != "y" ] || \
-		build_grub_roms "${cbrom}" "grub" || \
-		    err "build_roms: build_grub_roms failed"
+		x_ build_grub_roms "${cbrom}" "grub"
 	[ "${payload_uboot}" = "y" ] || return 0
 	build_uboot_roms
 }
@@ -229,68 +221,57 @@ build_seabios_roms()
 {
 	if [ "${payload_seabios_withgrub}" = "y" ]; then
 		tmprom=$(mktemp -t coreboot_rom.XXXXXXXXXX)
-		cp "${cbrom}" "${tmprom}" || \
-		    err "build_seabios_roms: cannot copy to tmprom"
-		build_grub_roms "${tmprom}" "seabios_withgrub" || \
-		    err "build_roms: cannot build grub roms, seabios w/grub"
-		rm -f "${tmprom}" || err "build_roms: can't remove tmprom"
+		x_ cp "${cbrom}" "${tmprom}"
+		x_ build_grub_roms "${tmprom}" "seabios_withgrub"
+		x_ rm -f "${tmprom}"
 	else
 		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}_${initmode}"
-		moverom "${t}" "${newrom}.rom" || \
-		    err "build_roms: cannot copy rom"
-		rm -f "${t}" || err "cannot rm ${t}"
+		x_ moverom "${t}" "${newrom}.rom"
+		x_ rm -f "${t}"
 	fi
-
 }
 
 # Make separate ROM images with GRUB payload, for each supported keymap
-build_grub_roms() {
+build_grub_roms()
+{
 	tmprom="${1}"
 	payload1="${2}" # allow values: grub, seabios, seabios_withgrub
 	grub_cbfs="fallback/payload"
 
 	if [ "${payload_grub_withseabios}" = "y" ] && \
 	    [ "${payload1}" = "grub" ]; then
-		mv "$(mkSeabiosRom "${tmprom}" "seabios.elf")" "${tmprom}" || \
-		    err "build_grub_roms: cannot move tmp rom (seabios.elf)"
+		x_ mv "$(mkSeabiosRom "${tmprom}" "seabios.elf")" "${tmprom}"
 	elif [ "${payload_seabios_withgrub}" = "y" ] && \
 	    [ "${payload1}" != "grub" ]; then
-		mv "$(mkSeabiosRom "${tmprom}" fallback/payload)" "${tmprom}" \
-		    || err "build_grub_roms: cannot move SeaBIOS ROM to tmprom"
+		x_ mv "$(mkSeabiosRom "${tmprom}" fallback/payload)" "${tmprom}"
 		grub_cbfs="img/grub2"
 	fi
 
 	# we only need insert grub.elf once, for each coreboot config:
-	"${cbfstool}" "${tmprom}" add-payload -f "${grubelf}" -n ${grub_cbfs} \
-	    -c lzma || err "build_grub_roms: cannot add grub payload to tmprom"
+	x_ "${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 ${backgroundfile} \
-		    -n background.png -t raw || \
-		    err "build_grub_roms: cannot add background.png to tmprom"
-
+		x_ "${cbfstool}" "${tmprom}" add -f ${backgroundfile} \
+		    -n background.png -t raw
 	fi
 
 	tmpcfg=$(mktemp -t coreboot_rom.XXXXXXXXXX) || 
 	    err "build_grub_roms: cannot create temporary scan.cfg"
-	printf "set grub_scan_disk=\"%s\"\n" "${grub_scan_disk}" > \
-	    "${tmpcfg}" || err "build_grub_roms: cannot create scan.cfg"
+	x_ printf "set grub_scan_disk=\"%s\"\n" "${grub_scan_disk}" >"${tmpcfg}"
 	[ "${grub_scan_disk}" = "both" ] || \
-		"${cbfstool}" "${tmprom}" add -f "${tmpcfg}" -n scan.cfg -t \
-		    raw || err "build_grub_roms: can't insert scan.cfg"
-	printf "set timeout=%s\n" "${grub_timeout}" > "${tmpcfg}" || \
-	    err "build_grub_roms: can't create timeout.cfg"
-	[ -z "${grub_timeout}" ] || \
-		"${cbfstool}" "${tmprom}" add -f "${tmpcfg}" -n timeout.cfg \
-		    -t raw || err "build_grub_roms: can't insert timeout.cfg"
-	rm -f "${tmpcfg}" || err "build_grub_roms: can't delete tmpcfg"
+	    x_ "${cbfstool}" "${tmprom}" add -f "${tmpcfg}" -n scan.cfg -t raw
+	x_ printf "set timeout=%s\n" "${grub_timeout}" > "${tmpcfg}"
+	[ -z "${grub_timeout}" ] || x_ "${cbfstool}" "${tmprom}" add \
+	    -f "${tmpcfg}" -n timeout.cfg -t raw
+	x_ rm -f "${tmpcfg}"
 
 	keymaps=""
 	for kmapfile in "${kmapdir}"/*; do
@@ -309,9 +290,8 @@ build_grub_roms() {
 		[ "${initmode}" = "normal" ] && \
 			newrom="${romdir}/${payload1}_${board}_" && \
 			newrom="${newrom}${initmode}_${keymap}.rom"
-		moverom "${tmpgrubrom}" "${newrom}" || \
-		    err "build_grub_roms, moverom"
-		rm -f "${tmpgrubrom}" || err "rm tmpgrubrom, build_grub_roms"
+		x_ moverom "${tmpgrubrom}" "${newrom}"
+		x_ rm -f "${tmpgrubrom}"
 	done
 }
 
@@ -324,9 +304,8 @@ mkGrubRom() {
 
 	tmprom=$(mktemp -t coreboot_rom.XXXXXXXXXX) || \
 	    err "mkGrubRom: cannot create tmprom"
-	cp "${_cbrom}" "${tmprom}" || err "mkGrubRom: cannot copy to tmprom"
-	"${cbfstool}" "${tmprom}" add -f "${keymapcfg}" -n keymap.cfg -t raw \
-	    || err "mkGrubRom: cannot add keymap.cfg to tmprom"
+	x_ cp "${_cbrom}" "${tmprom}"
+	x_ "${cbfstool}" "${tmprom}" add -f "${keymapcfg}" -n keymap.cfg -t raw
 
 	printf "%s\n" "${tmprom}"
 }
@@ -339,23 +318,17 @@ mkSeabiosRom() {
 	_seabioself="elf/seabios/default/${initmode}/bios.bin.elf"
 	tmprom=$(mktemp -t coreboot_rom.XXXXXXXXXX)
 
-	cp "${_cbrom}" "${tmprom}" || \
-	    err "mkSeabiosRom: cannot copy to tmprom"
-	"${cbfstool}" "${tmprom}" add-payload -f "${_seabioself}" \
-	    -n ${_seabios_cbfs_path} -c lzma || \
-	    err "mkSeabiosRom: can't add payload, ${_seabioself}, to rom"
-	"${cbfstool}" "${tmprom}" add-int -i 3000 -n etc/ps2-keyboard-spinup \
-	    || err "mkSeabiosRom: cbfs add-int etc/ps2-keyboard-spinup 3000"
+	x_ cp "${_cbrom}" "${tmprom}"
+	x_ "${cbfstool}" "${tmprom}" add-payload -f "${_seabioself}" \
+	    -n ${_seabios_cbfs_path} -c lzma
+	x_ "${cbfstool}" "${tmprom}" add-int -i 3000 -n etc/ps2-keyboard-spinup
 
 	z="2"; [ "${initmode}" = "vgarom" ] && z="0"
-	"${cbfstool}" "${tmprom}" add-int -i $z -n etc/pci-optionrom-exec || \
-	    err "mkSeabiosRom: cbfs add-int etc/pci-optionrom-exec 0"
-	"${cbfstool}" "${tmprom}" add-int -i 0 -n etc/optionroms-checksum || \
-	    err "mkSeabiosRom: cbfs add-int etc/optionroms-checksum 0"
+	x_ "${cbfstool}" "${tmprom}" add-int -i $z -n etc/pci-optionrom-exec
+	x_ "${cbfstool}" "${tmprom}" add-int -i 0 -n etc/optionroms-checksum
 	[ "${initmode}" != "libgfxinit" ] || \
-		"${cbfstool}" "${tmprom}" add -f "${seavgabiosrom}" \
-		    -n vgaroms/seavgabios.bin -t raw || \
-		    err "mkSeabiosRom: cbfs add-raw vgaroms/seavgabios.bin"
+		x_ "${cbfstool}" "${tmprom}" add -f "${seavgabiosrom}" \
+		    -n vgaroms/seavgabios.bin -t raw
 
 	printf "%s\n" "${tmprom}"
 }
@@ -366,9 +339,8 @@ build_uboot_roms()
 	newrom="${romdir}/uboot_payload_${board}_${initmode}_${displaymode}.rom"
 	[ "${initmode}" = "normal" ] && \
 		newrom="${romdir}/uboot_payload_${board}_${initmode}.rom"
-	moverom "${tmprom}" "${newrom}" || \
-	    err "build_roms: moverom fail (u-boot)"
-	rm -f "${tmprom}" || err "build_roms: cannot rm u-boot rom"
+	x_ moverom "${tmprom}" "${newrom}"
+	x_ rm -f "${tmprom}"
 }
 
 # make a rom in /tmp/ and then print the path of that ROM
@@ -384,11 +356,9 @@ mkUbootRom() {
 
 	tmprom=$(mktemp -t coreboot_rom.XXXXXXXXXX)
 
-	cp "${_cbrom}" "${tmprom}" || \
-	    err "mkUbootRom: cannot copy to tmprom"
-	"${cbfstool}" "${tmprom}" add-payload -f "${_ubootelf}" \
-	    -n ${_uboot_cbfs_path} -c lzma || \
-	    err "mkUbootRom: cannot add u-boot to tmprom"
+	x_ cp "${_cbrom}" "${tmprom}"
+	x_ "${cbfstool}" "${tmprom}" add-payload -f "${_ubootelf}" \
+	    -n ${_uboot_cbfs_path} -c lzma
 
 	printf "%s\n" "${tmprom}"
 }
@@ -401,10 +371,9 @@ moverom() {
 
 	printf "Creating target image: %s\n" "${newrom}"
 
-	[ -d "${newrom%/*}" ] || mkdir -p "${newrom%/*}/" || \
-	    err "moverom: cannot create rom directory: \"${newrom%/*}\""
+	[ -d "${newrom%/*}" ] || x_ mkdir -p "${newrom%/*}/"
 	[ "${blobs_required}" = "n" ] && newrom="${newrom%.rom}_noblobs.rom"
-	cp "${rompath}" "${newrom}" || err "moverom: can't copy rom"
+	x_ cp "${rompath}" "${newrom}"
 }
 
 main $@