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>

script/update/blobs/inject

@@ -82,18 +82,15 @@ detect_board()
 		err "detect_board: could not detect board type"
 	esac	
 	[ -d "${boarddir}/" ] || \
-	    err "detect_board: dir, ${boarddir}, doesn't exist"
+		err "detect_board: dir, ${boarddir}, doesn't exist"
 	printf "%s\n" "${board}"
 }
 
 build_dependencies()
 {
-	[ -d "${cbdir}" ] || ./update project trees coreboot default || \
-	    err "build_dependencies: could not download coreboot/default"
-	./build coreboot utils default || \
-	    err "build_dependencies: could not build cbutils"
-	./update blobs download ${board} || \
-	    err "build_dependencies: Could not download blobs for ${board}"
+	[ -d "${cbdir}" ] || x_ ./update project trees coreboot default
+	x_ ./build coreboot utils default
+	x_ ./update blobs download ${board}
 }
 
 inject_blobs()
@@ -104,35 +101,31 @@ inject_blobs()
 		release_archive="y"
 		patch_release_roms
 	else
-		patch_rom "${rom}" || \
-		    err "inject_blobs: could not patch ${x}"
+		x_ patch_rom "${rom}"
 	fi
 }
 
 patch_release_roms()
 {
 	_tmpdir="tmp/romdir"
-	rm -Rf "${_tmpdir}" || err "patch_release_roms 1: can't prepare tmpdir"
-	mkdir -p "${_tmpdir}" || err "patch_release_roms: can't make tmpdir"
-	tar -xf "${releasearchive}" -C "${_tmpdir}" || \
-	    err "patch_release_roms: could not extract release archive"
+	x_ rm -Rf "${_tmpdir}"
+	x_ mkdir -p "${_tmpdir}"
+	x_ tar -xf "${releasearchive}" -C "${_tmpdir}"
 
 	for x in "${_tmpdir}"/bin/*/*.rom ; do
 		printf "patching rom: %s\n" "$x"
-		patch_rom "${x}" || err "patch_release_roms: could not patch ${x}"
+		x_ patch_rom "${x}"
 	done
 	for x in "${_tmpdir}"/bin/*/*_nomicrocode.rom ; do
 		[ -f "${x}" ] || continue
 		[ -f "${x%_nomicrocode.rom}.rom" ] || continue
 
-		cp "${x%_nomicrocode.rom}.rom" "${x}" || \
-		    err "patch_release_roms: ${x}: can't overwrite no-ucode rom"
-		"${cbfstool}" "${x}" remove -n cpu_microcode_blob.bin || \
-		    err "patch_release_roms: ${x}: cannot remove u-code"
+		x_ cp "${x%_nomicrocode.rom}.rom" "${x}"
+		x_ "${cbfstool}" "${x}" remove -n cpu_microcode_blob.bin
 	done
 
 	(
-	cd "${_tmpdir}"/bin/*
+	x_ cd "${_tmpdir}/bin/"*
 
 	# NOTE: For compatibility with older rom releases, defer to sha1
 	sha512sum --status -c blobhashes || \
@@ -146,14 +139,12 @@ patch_release_roms()
 		done
 	fi
 
-	[ -d bin/release ] || mkdir -p bin/release || \
-	    err "patch_release_roms: !mkdir -p bin/release"
-	mv "${_tmpdir}"/bin/* bin/release/ || \
-	    err "patch_release_roms: !mv ${_tmpdir}/bin/* bin/release/"
+	[ -d bin/release ] || x_ mkdir -p bin/release
+	x_ mv "${_tmpdir}"/bin/* bin/release/
 
 	printf "Success! Your ROMs are in bin/release\n"
 
-	rm -Rf "${_tmpdir}" || err "patch_release_roms: !rm -Rf ${_tmpdir}"
+	x_ rm -Rf "${_tmpdir}"
 }
 
 patch_rom()
@@ -170,7 +161,7 @@ patch_rom()
 	[ -f "${rom%_nomicrocode.rom}.rom" ] && \
 	[ "${release_archive}" = "y" ] && return 0
 
-	check_defconfig "${boarddir}" || err "patch_rom ${rom}: no defconfig"
+	x_ check_defconfig "${boarddir}"
 
 	set -- "${boarddir}/config/"*
 	. "${1}" 2>/dev/null
@@ -217,8 +208,8 @@ inject_blob_intel_mrc()
 	# source code, and it is *always* correct for haswell platform.
 	# TODO: this logic should be tweaked to handle more platforms
 
-	"${cbfstool}" "${rom}" add -f mrc/haswell/mrc.bin -n mrc.bin -t mrc \
-	    -b 0xfffa0000 || err "inject_blob_intel_mrc: cannot insert mrc.bin"
+	x_ "${cbfstool}" "${rom}" add -f mrc/haswell/mrc.bin -n mrc.bin \
+	    -t mrc -b 0xfffa0000
 }
 
 inject_blob_intel_me()
@@ -233,8 +224,7 @@ inject_blob_intel_me()
 	[ ! -f "${_me_location}" ] && \
 		err "inject_blob_intel_me: per CONFIG_ME_BIN_PATH: file missing"
 
-	"${ifdtool}" -i me:"${_me_location}" "${rom}" -O "${rom}" || \
-	    err "inject_blob_intel_me: cannot insert me.bin"
+	x_ "${ifdtool}" -i me:"${_me_location}" "${rom}" -O "${rom}"
 }
 
 inject_blob_hp_kbc1126_ec()
@@ -258,12 +248,10 @@ inject_blob_hp_kbc1126_ec()
 		err "inject_blob_hp_kbc1126_ec: ${board}: ecfw not downloaded"
 	fi
 
-	"${cbfstool}" "${rom}" add -f "${_ec1_location}" -n ecfw1.bin \
-	    -b ${_ec1_offset} -t raw || \
-	    err "inject_blob_hp_kbc1126_ec: cannot insert ecfw1.bin"
-	"${cbfstool}" "${rom}" add -f "${_ec2_location}" -n ecfw2.bin \
-	    -b ${_ec2_offset} -t raw || \
-	    err "inject_blob_hp_kbc1126_ec: cannot insert ecfw2.bin"
+	x_ "${cbfstool}" "${rom}" add -f "${_ec1_location}" -n ecfw1.bin \
+	    -b ${_ec1_offset} -t raw
+	x_ "${cbfstool}" "${rom}" add -f "${_ec2_location}" -n ecfw2.bin \
+	    -b ${_ec2_offset} -t raw
 }
 
 inject_blob_dell_e6400_vgarom_nvidia()
@@ -276,29 +264,24 @@ inject_blob_dell_e6400_vgarom_nvidia()
 
 	printf "adding pci option rom\n"
 
-	if [ "${_vga_dir}" != "${pciromsdir}" ]; then
+	[ "${_vga_dir}" = "${pciromsdir}" ] || \
 		err "inject_blob_dell_e6400vga: invalid pcirom dir: ${_vga_dir}"
-	fi
-	if [ ! -f "${_vga_location}" ]; then
+	[ -f "${_vga_location}" ] || \
 		err "inject_blob_dell_e6400vga: ${_vga_location} doesn't exist"
-	fi
 
-	"${cbfstool}" "${rom}" add -f "${_vga_location}" \
-	    -n "pci${CONFIG_VGA_BIOS_ID}.rom" -t optionrom || \
-	    err "inject_blob_dell_e6400vga: cannot insert vga oprom"
+	x_ "${cbfstool}" "${rom}" add -f "${_vga_location}" \
+	    -n "pci${CONFIG_VGA_BIOS_ID}.rom" -t optionrom
 }
 
 inject_blob_smsc_sch5545_ec()
 {
 	rom="${1}"
 	_sch5545ec_location="${CONFIG_SMSC_SCH5545_EC_FW_FILE#../../}"
-
 	[ -f "${_sch5545ec_location}" ] || \
 		err "inject_blob_smsc_sch5545_ec: SCH5545 fw missing"
 
-	"${cbfstool}" "${rom}" add -f "${_sch5545ec_location}" \
-	    -n sch5545_ecfw.bin -t raw || \
-	    err "inject_blob_smsc_sch5545_ec: can't insert sch5545_ecfw.bin"
+	x_ "${cbfstool}" "${rom}" add -f "${_sch5545ec_location}" \
+	    -n sch5545_ecfw.bin -t raw
 }
 
 modify_gbe()
@@ -309,21 +292,17 @@ modify_gbe()
 
 	rom="${1}"
 	_gbe_location=${CONFIG_GBE_BIN_PATH#../../}
-
 	[ -f "${_gbe_location}" ] || \
 		err "modify_gbe: CONFIG_GBE_BIN_PATH points to missing file"
 	[ -f "${nvmutil}" ] || \
-		make -C util/nvmutil || err "modify_gbe: couldn't build nvmutil"
+		x_ make -C util/nvmutil
 
 	_gbe_tmp=$(mktemp -t gbeXXXX.bin)
-	cp "${_gbe_location}" "${_gbe_tmp}"
-	"${nvmutil}" "${_gbe_tmp}" setmac "${new_mac}" || \
-	    err "modify_gbe: ${board}: failed to modify mac address"
+	x_ cp "${_gbe_location}" "${_gbe_tmp}"
+	x_ "${nvmutil}" "${_gbe_tmp}" setmac "${new_mac}"
+	x_ "${ifdtool}" -i GbE:"${_gbe_tmp}" "${rom}" -O "${rom}"
 
-	"${ifdtool}" -i GbE:"${_gbe_tmp}" "${rom}" -O "${rom}" || \
-	    err "modify_gbe: ${board}: cannot insert modified gbe.bin"
-
-	rm -f "${_gbe_tmp}" || err "modify_gbe: can't remove ${_gbe_tmp}"
+	x_ rm -f "${_gbe_tmp}"
 }
 
 usage()