src/util/genfsimg - ipxe - Git at Google

 #!/bin/sh
 #
 # Generate a filesystem-based image

 set -e
 set -u

 # Print usage message
 #
 help() {
     echo "usage: ${0} [OPTIONS] foo.lkrn|foo.efi [bar.lkrn|bar.efi,...]"
     echo
     echo "where OPTIONS are:"
     echo " -h         show this help"
     echo " -o FILE    save image to file"
     echo " -p PAD     pad filesystem (in kB)"
     echo " -s SCRIPT  use executable script"
 }

 # Get hex byte from binary file
 #
 get_byte() {
     local FILENAME
     local OFFSET

     FILENAME="${1}"
     OFFSET="${2}"

     od -j "${OFFSET}" -N 1 -A n -t x1 -- "${FILENAME}" | tr -d " "
 }

 # Get hex word from binary file
 #
 get_word() {
     local FILENAME
     local OFFSET

     FILENAME="${1}"
     OFFSET="${2}"

     od -j "${OFFSET}" -N 2 -A n -t x1 -- "${FILENAME}" | tr -d " "
 }

 # Get appropriate EFI boot filename for CPU architecture
 #
 efi_boot_name() {
     local FILENAME
     local PESIG
     local ARCH

     FILENAME="${1}"

     MZSIG=$(get_word "${FILENAME}" 0)
     if [ "${MZSIG}" != "4d5a" ] ; then
 	echo "${FILENAME}: invalid MZ header" >&2
 	exit 1
     fi
     PEOFF=$(get_byte "${FILENAME}" 0x3c)
     PESIG=$(get_word "${FILENAME}" 0x${PEOFF})
     if [ "${PESIG}" != "5045" ] ; then
 	echo "${FILENAME}: invalid PE header" >&2
 	exit 1
     fi
     ARCH=$(get_word "${FILENAME}" $(( 0x${PEOFF} + 4 )) )
     case "${ARCH}" in
 	"4c01" )
 	    echo "BOOTIA32.EFI"
 	    ;;
 	"6486" )
 	    echo "BOOTX64.EFI"
 	    ;;
 	"c201" )
 	    echo "BOOTARM.EFI"
 	    ;;
 	"6462" )
 	    echo "BOOTLOONGARCH64.EFI"
 	    ;;
 	"64aa" )
 	    echo "BOOTAA64.EFI"
 	    ;;
 	* )
 	    echo "${FILENAME}: unrecognised EFI architecture ${ARCH}" >&2
 	    exit 1
     esac
 }

 # Copy syslinux file
 #
 copy_syslinux_file() {
     local FILENAME
     local DESTDIR
     local SRCDIR

     FILENAME="${1}"
     DESTDIR="${2}"

     for SRCDIR in \
 	/usr/lib/syslinux \
 	/usr/lib/syslinux/bios \
 	/usr/lib/syslinux/modules/bios \
 	/usr/share/syslinux \
 	/usr/share/syslinux/bios \
 	/usr/share/syslinux/modules/bios \
 	/usr/local/share/syslinux \
 	/usr/local/share/syslinux/bios \
 	/usr/local/share/syslinux/bios/core \
 	/usr/local/share/syslinux/bios/com32/elflink/ldlinux \
 	/usr/local/share/syslinux/modules/bios \
 	/usr/lib/ISOLINUX \
 	; do
 	if [ -e "${SRCDIR}/${FILENAME}" ] ; then
 	    install -m 644 "${SRCDIR}/${FILENAME}" "${DESTDIR}/"
 	    return 0
 	fi
     done
     echo "${0}: could not find ${FILENAME}" >&2
     return 1
 }

 # Parse command-line options
 #
 OUTFILE=
 PAD=0
 SCRIPT=
 while getopts "hlo:p:s:" OPTION ; do
     case "${OPTION}" in
 	h)
 	    help
 	    exit 0
 	    ;;
 	o)
 	    OUTFILE="${OPTARG}"
 	    ;;
 	p)
 	    PAD="${OPTARG}"
 	    ;;
 	s)
 	    SCRIPT="${OPTARG}"
 	    ;;
 	*)
 	    help
 	    exit 1
 	    ;;
     esac
 done
 if [ -z "${OUTFILE}" ]; then
     echo "${0}: no output file given" >&2
     help
     exit 1
 fi
 shift $(( OPTIND - 1 ))
 if [ $# -eq 0 ] ; then
     echo "${0}: no input files given" >&2
     help
     exit 1
 fi

 # Create temporary working directory
 #
 WORKDIR=$(mktemp -d "${OUTFILE}.XXXXXX")
 ISODIR="${WORKDIR}/iso"
 FATDIR="${WORKDIR}/fat"
 mkdir -p "${ISODIR}" "${FATDIR}"

 # Configure output
 #
 case "${OUTFILE}" in
     *.iso)
 	ISOIMG="${OUTFILE}"
 	FATIMG="${ISODIR}/esp.img"
 	BIOSDIR="${ISODIR}"
 	SYSLINUXCFG="${ISODIR}/isolinux.cfg"
 	;;
     *)
 	ISOIMG=
 	FATIMG="${OUTFILE}"
 	BIOSDIR="${FATDIR}"
 	SYSLINUXCFG="${FATDIR}/syslinux.cfg"
 	;;
 esac

 # Copy files to temporary working directory
 #
 LKRN=
 EFI=
 for FILENAME ; do
     case "${FILENAME}" in
 	*.lkrn)
 	    DESTDIR="${BIOSDIR}"
 	    DESTFILE=$(basename "${FILENAME}")
 	    if [ -z "${LKRN}" ] ; then
 		echo "SAY iPXE boot image" > "${SYSLINUXCFG}"
 		echo "TIMEOUT 30" >> "${SYSLINUXCFG}"
 		echo "DEFAULT ${DESTFILE}" >> "${SYSLINUXCFG}"
 		if [ -n "${SCRIPT}" ] ; then
 		    cp "${SCRIPT}" "${BIOSDIR}/autoexec.ipxe"
 		fi
 	    fi
 	    echo "LABEL ${DESTFILE}" >> "${SYSLINUXCFG}"
 	    echo " KERNEL ${DESTFILE}" >> "${SYSLINUXCFG}"
 	    if [ -n "${SCRIPT}" ] ; then
 		echo " APPEND initrd=autoexec.ipxe" >> "${SYSLINUXCFG}"
 	    fi
 	    LKRN=1
 	    ;;
 	*.efi)
 	    DESTDIR="${FATDIR}/EFI/BOOT"
 	    DESTFILE=$(efi_boot_name "${FILENAME}")
 	    if [ -z "${EFI}" ] ; then
 		mkdir -p "${DESTDIR}"
 		if [ -n "${SCRIPT}" ] ; then
 		    cp "${SCRIPT}" "${FATDIR}/autoexec.ipxe"
 		fi
 	    fi
 	    EFI=1
 	    ;;
 	*)
 	    echo "${0}: unrecognised input filename ${FILENAME}" >&2
 	    help
 	    exit 1
 	    ;;
     esac
     if [ -e "${DESTDIR}/${DESTFILE}" ] ; then
 	echo "${0}: duplicate ${DESTFILE} from ${FILENAME}" >&2
 	exit 1
     fi
     cp "${FILENAME}" "${DESTDIR}/${DESTFILE}"
 done

 # Configure ISO image, if applicable
 #
 # Note that the BIOS boot files are required even for an EFI-only ISO,
 # since isohybrid will refuse to work without them.
 #
 if [ -n "${ISOIMG}" ] ; then
     ISOARGS="-J -R -l"
     copy_syslinux_file "isolinux.bin" "${ISODIR}"
     copy_syslinux_file "ldlinux.c32" "${ISODIR}" 2>/dev/null || true
     ISOARGS="${ISOARGS} -no-emul-boot -eltorito-boot isolinux.bin"
     ISOARGS="${ISOARGS} -boot-load-size 4 -boot-info-table"
     if [ -n "${EFI}" ] ; then
 	ISOARGS="${ISOARGS} -eltorito-alt-boot -no-emul-boot -e esp.img"
     else
 	FATIMG=
     fi
     if [ -n "${SOURCE_DATE_EPOCH:-}" ] ; then
 	DATE_FMT="+%Y%m%d%H%M%S00"
 	BUILD_DATE=$(date -u -d "@${SOURCE_DATE_EPOCH}" "${DATE_FMT}" \
 			  2>/dev/null || \
 		     date -u -r "${SOURCE_DATE_EPOCH}" "${DATE_FMT}" \
 			  2>/dev/null || \
 		     date -u "${DATE_FMT}")
 	ISOARGS="${ISOARGS} --set_all_file_dates ${BUILD_DATE}"
 	ISOARGS="${ISOARGS} --modification-date=${BUILD_DATE}"
     fi
 fi

 # Create FAT filesystem image, if applicable
 #
 if [ -n "${FATIMG}" ] ; then
     FATSIZE=$(du -s -k "${FATDIR}" | cut -f1)
     FATSIZE=$(( FATSIZE + PAD + 256 ))
     touch "${FATIMG}"
     if [ "${FATSIZE}" -le "1440" ] ; then
 	FATSIZE=1440
 	FATARGS="-f 1440"
     else
 	FATCYLS=$(( ( FATSIZE + 503 ) / 504 ))
 	FATSIZE=$(( FATCYLS * 504 ))
 	FATARGS="-s 63 -h 16 -t ${FATCYLS}"
     fi
     if [ -n "${SOURCE_DATE_EPOCH:-}" ] ; then
 	FATSERIAL=$(( SOURCE_DATE_EPOCH % 100000000 ))
 	FATARGS="${FATARGS} -N ${FATSERIAL}"
     fi
     truncate -s "${FATSIZE}K" "${FATIMG}"
     mformat -v iPXE -i "${FATIMG}" ${FATARGS} ::
     mcopy -i "${FATIMG}" -s "${FATDIR}"/* ::
     if [ "${BIOSDIR}" = "${FATDIR}" ] ; then
 	syslinux "${FATIMG}"
     fi
 fi

 # Create ISO filesystem image, if applicable
 #
 if [ -n "${ISOIMG}" ] ; then
     MKISOFS=
     MKISOFS_MISSING=
     MKISOFS_NOTSUP=
     for CMD in genisoimage mkisofs xorrisofs ; do
 	if ! "${CMD}" --version >/dev/null 2>&1 ; then
 	    MKISOFS_MISSING="${MKISOFS_MISSING} ${CMD}"
 	    continue
 	fi
 	if ! "${CMD}" ${ISOARGS} --version "${ISODIR}" >/dev/null 2>&1 ; then
 	    MKISOFS_NOTSUP="${MKISOFS_NOTSUP} ${CMD}"
 	    continue
 	fi
 	MKISOFS="${CMD}"
 	break
     done
     if [ -z "${MKISOFS}" ] ; then
 	if [ -n "${MKISOFS_MISSING}" ] ; then
 	    echo "${0}:${MKISOFS_MISSING}: not installed" >&2
 	fi
 	if [ -n "${MKISOFS_NOTSUP}" ] ; then
 	    echo "${0}:${MKISOFS_NOTSUP}: cannot handle ${ISOARGS}" >&2
 	fi
 	echo "${0}: cannot find a suitable mkisofs or equivalent" >&2
 	exit 1
     fi
     "${MKISOFS}" -quiet -volid "iPXE" -preparer "iPXE build system" \
 	    -appid "iPXE - Open Source Network Boot Firmware" \
 	    -publisher "ipxe.org" -sysid "iPXE" -o "${ISOIMG}" \
 	    ${ISOARGS} "${ISODIR}"
     if isohybrid --version >/dev/null 2>&1 ; then
 	ISOHYBRIDARGS=
 	if [ -n "${EFI}" ] ; then
 	    ISOHYBRIDARGS="${ISOHYBRIDARGS} --uefi"
 	fi
 	if [ -n "${SOURCE_DATE_EPOCH:-}" ] ; then
 	    ISOHYBRIDARGS="${ISOHYBRIDARGS} --id ${SOURCE_DATE_EPOCH}"
 	fi
 	isohybrid ${ISOHYBRIDARGS} "${ISOIMG}"
     fi
 fi

 # Clean up temporary working directory
 #
 rm -rf "${WORKDIR}"
	#!/bin/sh
	#
	# Generate a filesystem-based image

	set -e
	set -u

	# Print usage message
	#
	help() {
	echo "usage: ${0} [OPTIONS] foo.lkrn\|foo.efi [bar.lkrn\|bar.efi,...]"
	echo
	echo "where OPTIONS are:"
	echo " -h show this help"
	echo " -o FILE save image to file"
	echo " -p PAD pad filesystem (in kB)"
	echo " -s SCRIPT use executable script"
	}

	# Get hex byte from binary file
	#
	get_byte() {
	local FILENAME
	local OFFSET

	FILENAME="${1}"
	OFFSET="${2}"

	od -j "${OFFSET}" -N 1 -A n -t x1 -- "${FILENAME}" \| tr -d " "
	}

	# Get hex word from binary file
	#
	get_word() {
	local FILENAME
	local OFFSET

	FILENAME="${1}"
	OFFSET="${2}"

	od -j "${OFFSET}" -N 2 -A n -t x1 -- "${FILENAME}" \| tr -d " "
	}

	# Get appropriate EFI boot filename for CPU architecture
	#
	efi_boot_name() {
	local FILENAME
	local PESIG
	local ARCH

	FILENAME="${1}"

	MZSIG=$(get_word "${FILENAME}" 0)
	if [ "${MZSIG}" != "4d5a" ] ; then
	echo "${FILENAME}: invalid MZ header" >&2
	exit 1
	fi
	PEOFF=$(get_byte "${FILENAME}" 0x3c)
	PESIG=$(get_word "${FILENAME}" 0x${PEOFF})
	if [ "${PESIG}" != "5045" ] ; then
	echo "${FILENAME}: invalid PE header" >&2
	exit 1
	fi
	ARCH=$(get_word "${FILENAME}" $(( 0x${PEOFF} + 4 )) )
	case "${ARCH}" in
	"4c01" )
	echo "BOOTIA32.EFI"
	;;
	"6486" )
	echo "BOOTX64.EFI"
	;;
	"c201" )
	echo "BOOTARM.EFI"
	;;
	"6462" )
	echo "BOOTLOONGARCH64.EFI"
	;;
	"64aa" )
	echo "BOOTAA64.EFI"
	;;
	* )
	echo "${FILENAME}: unrecognised EFI architecture ${ARCH}" >&2
	exit 1
	esac
	}

	# Copy syslinux file
	#
	copy_syslinux_file() {
	local FILENAME
	local DESTDIR
	local SRCDIR

	FILENAME="${1}"
	DESTDIR="${2}"

	for SRCDIR in \
	/usr/lib/syslinux \
	/usr/lib/syslinux/bios \
	/usr/lib/syslinux/modules/bios \
	/usr/share/syslinux \
	/usr/share/syslinux/bios \
	/usr/share/syslinux/modules/bios \
	/usr/local/share/syslinux \
	/usr/local/share/syslinux/bios \
	/usr/local/share/syslinux/bios/core \
	/usr/local/share/syslinux/bios/com32/elflink/ldlinux \
	/usr/local/share/syslinux/modules/bios \
	/usr/lib/ISOLINUX \
	; do
	if [ -e "${SRCDIR}/${FILENAME}" ] ; then
	install -m 644 "${SRCDIR}/${FILENAME}" "${DESTDIR}/"
	return 0
	fi
	done
	echo "${0}: could not find ${FILENAME}" >&2
	return 1
	}

	# Parse command-line options
	#
	OUTFILE=
	PAD=0
	SCRIPT=
	while getopts "hlo:p:s:" OPTION ; do
	case "${OPTION}" in
	h)
	help
	exit 0
	;;
	o)
	OUTFILE="${OPTARG}"
	;;
	p)
	PAD="${OPTARG}"
	;;
	s)
	SCRIPT="${OPTARG}"
	;;
	*)
	help
	exit 1
	;;
	esac
	done
	if [ -z "${OUTFILE}" ]; then
	echo "${0}: no output file given" >&2
	help
	exit 1
	fi
	shift $(( OPTIND - 1 ))
	if [ $# -eq 0 ] ; then
	echo "${0}: no input files given" >&2
	help
	exit 1
	fi

	# Create temporary working directory
	#
	WORKDIR=$(mktemp -d "${OUTFILE}.XXXXXX")
	ISODIR="${WORKDIR}/iso"
	FATDIR="${WORKDIR}/fat"
	mkdir -p "${ISODIR}" "${FATDIR}"

	# Configure output
	#
	case "${OUTFILE}" in
	*.iso)
	ISOIMG="${OUTFILE}"
	FATIMG="${ISODIR}/esp.img"
	BIOSDIR="${ISODIR}"
	SYSLINUXCFG="${ISODIR}/isolinux.cfg"
	;;
	*)
	ISOIMG=
	FATIMG="${OUTFILE}"
	BIOSDIR="${FATDIR}"
	SYSLINUXCFG="${FATDIR}/syslinux.cfg"
	;;
	esac

	# Copy files to temporary working directory
	#
	LKRN=
	EFI=
	for FILENAME ; do
	case "${FILENAME}" in
	*.lkrn)
	DESTDIR="${BIOSDIR}"
	DESTFILE=$(basename "${FILENAME}")
	if [ -z "${LKRN}" ] ; then
	echo "SAY iPXE boot image" > "${SYSLINUXCFG}"
	echo "TIMEOUT 30" >> "${SYSLINUXCFG}"
	echo "DEFAULT ${DESTFILE}" >> "${SYSLINUXCFG}"
	if [ -n "${SCRIPT}" ] ; then
	cp "${SCRIPT}" "${BIOSDIR}/autoexec.ipxe"
	fi
	fi
	echo "LABEL ${DESTFILE}" >> "${SYSLINUXCFG}"
	echo " KERNEL ${DESTFILE}" >> "${SYSLINUXCFG}"
	if [ -n "${SCRIPT}" ] ; then
	echo " APPEND initrd=autoexec.ipxe" >> "${SYSLINUXCFG}"
	fi
	LKRN=1
	;;
	*.efi)
	DESTDIR="${FATDIR}/EFI/BOOT"
	DESTFILE=$(efi_boot_name "${FILENAME}")
	if [ -z "${EFI}" ] ; then
	mkdir -p "${DESTDIR}"
	if [ -n "${SCRIPT}" ] ; then
	cp "${SCRIPT}" "${FATDIR}/autoexec.ipxe"
	fi
	fi
	EFI=1
	;;
	*)
	echo "${0}: unrecognised input filename ${FILENAME}" >&2
	help
	exit 1
	;;
	esac
	if [ -e "${DESTDIR}/${DESTFILE}" ] ; then
	echo "${0}: duplicate ${DESTFILE} from ${FILENAME}" >&2
	exit 1
	fi
	cp "${FILENAME}" "${DESTDIR}/${DESTFILE}"
	done

	# Configure ISO image, if applicable
	#
	# Note that the BIOS boot files are required even for an EFI-only ISO,
	# since isohybrid will refuse to work without them.
	#
	if [ -n "${ISOIMG}" ] ; then
	ISOARGS="-J -R -l"
	copy_syslinux_file "isolinux.bin" "${ISODIR}"
	copy_syslinux_file "ldlinux.c32" "${ISODIR}" 2>/dev/null \|\| true
	ISOARGS="${ISOARGS} -no-emul-boot -eltorito-boot isolinux.bin"
	ISOARGS="${ISOARGS} -boot-load-size 4 -boot-info-table"
	if [ -n "${EFI}" ] ; then
	ISOARGS="${ISOARGS} -eltorito-alt-boot -no-emul-boot -e esp.img"
	else
	FATIMG=
	fi
	if [ -n "${SOURCE_DATE_EPOCH:-}" ] ; then
	DATE_FMT="+%Y%m%d%H%M%S00"
	BUILD_DATE=$(date -u -d "@${SOURCE_DATE_EPOCH}" "${DATE_FMT}" \
	2>/dev/null \|\| \
	date -u -r "${SOURCE_DATE_EPOCH}" "${DATE_FMT}" \
	2>/dev/null \|\| \
	date -u "${DATE_FMT}")
	ISOARGS="${ISOARGS} --set_all_file_dates ${BUILD_DATE}"
	ISOARGS="${ISOARGS} --modification-date=${BUILD_DATE}"
	fi
	fi

	# Create FAT filesystem image, if applicable
	#
	if [ -n "${FATIMG}" ] ; then
	FATSIZE=$(du -s -k "${FATDIR}" \| cut -f1)
	FATSIZE=$(( FATSIZE + PAD + 256 ))
	touch "${FATIMG}"
	if [ "${FATSIZE}" -le "1440" ] ; then
	FATSIZE=1440
	FATARGS="-f 1440"
	else
	FATCYLS=$(( ( FATSIZE + 503 ) / 504 ))
	FATSIZE=$(( FATCYLS * 504 ))
	FATARGS="-s 63 -h 16 -t ${FATCYLS}"
	fi
	if [ -n "${SOURCE_DATE_EPOCH:-}" ] ; then
	FATSERIAL=$(( SOURCE_DATE_EPOCH % 100000000 ))
	FATARGS="${FATARGS} -N ${FATSERIAL}"
	fi
	truncate -s "${FATSIZE}K" "${FATIMG}"
	mformat -v iPXE -i "${FATIMG}" ${FATARGS} ::
	mcopy -i "${FATIMG}" -s "${FATDIR}"/* ::
	if [ "${BIOSDIR}" = "${FATDIR}" ] ; then
	syslinux "${FATIMG}"
	fi
	fi

	# Create ISO filesystem image, if applicable
	#
	if [ -n "${ISOIMG}" ] ; then
	MKISOFS=
	MKISOFS_MISSING=
	MKISOFS_NOTSUP=
	for CMD in genisoimage mkisofs xorrisofs ; do
	if ! "${CMD}" --version >/dev/null 2>&1 ; then
	MKISOFS_MISSING="${MKISOFS_MISSING} ${CMD}"
	continue
	fi
	if ! "${CMD}" ${ISOARGS} --version "${ISODIR}" >/dev/null 2>&1 ; then
	MKISOFS_NOTSUP="${MKISOFS_NOTSUP} ${CMD}"
	continue
	fi
	MKISOFS="${CMD}"
	break
	done
	if [ -z "${MKISOFS}" ] ; then
	if [ -n "${MKISOFS_MISSING}" ] ; then
	echo "${0}:${MKISOFS_MISSING}: not installed" >&2
	fi
	if [ -n "${MKISOFS_NOTSUP}" ] ; then
	echo "${0}:${MKISOFS_NOTSUP}: cannot handle ${ISOARGS}" >&2
	fi
	echo "${0}: cannot find a suitable mkisofs or equivalent" >&2
	exit 1
	fi
	"${MKISOFS}" -quiet -volid "iPXE" -preparer "iPXE build system" \
	-appid "iPXE - Open Source Network Boot Firmware" \
	-publisher "ipxe.org" -sysid "iPXE" -o "${ISOIMG}" \
	${ISOARGS} "${ISODIR}"
	if isohybrid --version >/dev/null 2>&1 ; then
	ISOHYBRIDARGS=
	if [ -n "${EFI}" ] ; then
	ISOHYBRIDARGS="${ISOHYBRIDARGS} --uefi"
	fi
	if [ -n "${SOURCE_DATE_EPOCH:-}" ] ; then
	ISOHYBRIDARGS="${ISOHYBRIDARGS} --id ${SOURCE_DATE_EPOCH}"
	fi
	isohybrid ${ISOHYBRIDARGS} "${ISOIMG}"
	fi
	fi

	# Clean up temporary working directory
	#
	rm -rf "${WORKDIR}"