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|
#!/bin/sh
#
# Generate a filesystem-based image
set -e
set -u
# Print usage message
#
help() {
echo "usage: ${0} [OPTIONS] foo.lkrn|foo.efi [bar.lkrn|bar.efi,...]"
echo
echo "where OPTIONS are:"
echo " -h show this help"
echo " -o FILE save image to file"
echo " -p PAD pad filesystem (in kB)"
}
# Get hex word from binary file
#
get_word() {
local FILENAME
local OFFSET
FILENAME="${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}"
PESIG=$(get_word "${FILENAME}" 192)
if [ "${PESIG}" != "5045" ] ; then
echo "${FILENAME}: not an EFI executable" >&2
exit 1
fi
ARCH=$(get_word "${FILENAME}" 196)
case "${ARCH}" in
"4c01" )
echo "BOOTIA32.EFI"
;;
"6486" )
echo "BOOTX64.EFI"
;;
"c201" )
echo "BOOTARM.EFI"
;;
"64aa" )
echo "BOOTAA64.EFI"
;;
* )
echo "${FILENAME}: unrecognised EFI architecture ${ARCH}" >&2
exit 1
esac
}
# Copy syslinux file
#
copy_syslinux_file() {
local FILENAME
local DESTDIR
local SRCDIR
FILENAME="${1}"
DESTDIR="${2}"
for SRCDIR in \
/usr/lib/syslinux \
/usr/lib/syslinux/bios \
/usr/lib/syslinux/modules/bios \
/usr/share/syslinux \
/usr/share/syslinux/bios \
/usr/share/syslinux/modules/bios \
/usr/local/share/syslinux \
/usr/local/share/syslinux/bios \
/usr/local/share/syslinux/modules/bios \
/usr/lib/ISOLINUX \
; do
if [ -e "${SRCDIR}/${FILENAME}" ] ; then
cp "${SRCDIR}/${FILENAME}" "${DESTDIR}/"
break
fi
done
}
# Parse command-line options
#
OUTFILE=
PAD=0
while getopts "hlo:p:" OPTION ; do
case "${OPTION}" in
h)
help
exit 0
;;
o)
OUTFILE="${OPTARG}"
;;
p)
PAD="${OPTARG}"
;;
*)
help
exit 1
;;
esac
done
if [ -z "${OUTFILE}" ]; then
echo "${0}: no output file given" >&2
help
exit 1
fi
shift $(( OPTIND - 1 ))
# Create temporary working directory
#
WORKDIR=$(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="${FATDIR}/syslinux.cfg"
;;
esac
ISOARGS=
# Locate required tools
#
if [ -n "${ISOIMG}" ] ; then
MKISOFS=
for CMD in genisoimage mkisofs ; do
if ${CMD} --version >/dev/null 2>/dev/null ; then
MKISOFS="${CMD}"
break
fi
done
if [ -z "${MKISOFS}" ] ; then
echo "${0}: cannot find mkisofs or equivalent" >&2
exit 1
fi
fi
# 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}"
fi
echo "LABEL ${DESTFILE}" >> "${SYSLINUXCFG}"
echo " KERNEL ${DESTFILE}" >> "${SYSLINUXCFG}"
LKRN=1
;;
*.efi)
DESTDIR="${FATDIR}/EFI/BOOT"
DESTFILE=$(efi_boot_name "${FILENAME}")
if [ -z "${EFI}" ] ; then
mkdir -p "${DESTDIR}"
fi
EFI=1
;;
*)
echo "${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 "${ISOIMG}" ] ; then
copy_syslinux_file "isolinux.bin" "${ISODIR}"
copy_syslinux_file "ldlinux.c32" "${ISODIR}" || true
ISOARGS="${ISOARGS} -no-emul-boot -eltorito-boot isolinux.bin"
ISOARGS="${ISOARGS} -boot-load-size 4 -boot-info-table"
if [ -n "${EFI}" ] ; then
ISOARGS="${ISOARGS} -eltorito-alt-boot -no-emul-boot -efi-boot esp.img"
else
FATIMG=
fi
fi
# Create FAT filesystem image, if applicable
#
if [ -n "${FATIMG}" ] ; then
FATSIZE=$(du -s -k ${FATDIR} | cut -f1)
FATSIZE=$(( FATSIZE + PAD + 256 ))
touch "${FATIMG}"
if [ "${FATSIZE}" -le "1440" ] ; then
truncate -s 1440K "${FATIMG}"
mformat -f 1440 -i "${FATIMG}" ::
else
truncate -s "${FATSIZE}K" "${FATIMG}"
mformat -i "${FATIMG}" ::
fi
mcopy -i "${FATIMG}" -s "${FATDIR}"/* ::
if [ "${BIOSDIR}" = "${FATDIR}" ] ; then
syslinux "${FATIMG}"
fi
fi
# Create ISO filesystem image, if applicable
#
if [ -n "${ISOIMG}" ] ; then
"${MKISOFS}" -quiet -volid "iPXE" -preparer "iPXE build system" \
-appid "iPXE - Open Source Network Boot Firmware" \
-publisher "ipxe.org" -sysid "iPXE" -J -R -o "${ISOIMG}" \
${ISOARGS} "${ISODIR}"
if isohybrid --version >/dev/null 2>/dev/null ; then
isohybrid "${ISOIMG}"
fi
fi
# Clean up temporary working directory
#
rm -rf "${WORKDIR}"
|
