local-server/scripts/grub_install.sh

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2018-11-13 03:44:15 +00:00
#!/bin/bash
set -e
disk_image="${1}"
LOOP_DEV="${2}"
ESP_DIR="${3}"
# i386-pc or x86_64-efi
target=${4:-x86_64-efi}
export PATH="/opt/grub/bin:/opt/grub/sbin:$PATH"
info() {
echo "INFO:" "$@"
}
warn() {
echo "WARN:" "$@"
}
cleanup() {
if [[ -n "${GRUB_TEMP_DIR}" && -e "${GRUB_TEMP_DIR}" ]]; then
rm -r "${GRUB_TEMP_DIR}"
fi
}
trap cleanup EXIT
info "Installing GRUB in ${disk_image##*/}"
mkdir -p "${ESP_DIR}/grub"
GRUB_TEMP_DIR="$(mktemp -d)"
devmap="${GRUB_TEMP_DIR}/device.map"
cat >${devmap} <<EOF
(hd0) ${LOOP_DEV}
EOF
mkdir -p "${ESP_DIR}/grub"
sed -e "s/{{.FSID}}/$ESP_FSID/g" "/assets/grub.cfg" > "${ESP_DIR}/grub/grub.cfg"
info "Generating grub/load.cfg"
# Include a small initial config in the core image to search for the ESP
# by filesystem ID in case the platform doesn't provide the boot disk.
# The existing $root value is given as a hint so it is searched first.
ESP_FSID=$(grub-probe --device-map=$devmap -t fs_uuid -d "${LOOP_DEV}p1")
cat > "${ESP_DIR}/grub/load.cfg" <<EOF
search.fs_uuid ${ESP_FSID} root \$root
set prefix=(memdisk)
set
EOF
# Generate a memdisk containing the appropriately generated grub.cfg. Doing
# this because we need conflicting default behaviors between verity and
# non-verity images.
info "Generating grub.cfg memdisk"
sed -e "s/{{.FSID}}/$ESP_FSID/g" "/assets/grub.cfg" > "${GRUB_TEMP_DIR}/grub.cfg"
mkdir -p "${ESP_DIR}/grub"
tar cf "${ESP_DIR}/grub/grub.cfg.tar" \
-C "${GRUB_TEMP_DIR}" "grub.cfg"
for target in i386-pc x86_64-efi
do
GRUB_SRC="/usr/lib/grub/${target}"
GRUB_DIR="grub/${target}"
[[ -d "${GRUB_SRC}" ]] || die "GRUB not installed at ${GRUB_SRC}"
info "Compressing modules in ${GRUB_DIR}"
mkdir -p "${ESP_DIR}/${GRUB_DIR}"
for file in "${GRUB_SRC}"/*{.lst,.mod}; do
out="${ESP_DIR}/${GRUB_DIR}/${file##*/}"
gzip --best --stdout "${file}" | cat > "${out}"
done
# Modules required to boot a standard configuration
CORE_MODULES=( normal search test fat part_gpt search_fs_uuid gzio terminal configfile memdisk tar echo read )
#CORE_MODULES+=( search_part_label gptprio )
# Name of the core image, depends on target
CORE_NAME=
case "${target}" in
i386-pc)
CORE_MODULES+=( biosdisk serial linux )
CORE_NAME="core.img"
;;
x86_64-efi)
CORE_MODULES+=( serial linuxefi efi_gop efinet verify http tftp )
#CORE_MODULES+=( getenv smbios )
CORE_NAME="core.efi"
;;
*)
die_notrace "Unknown GRUB target ${target}"
;;
esac
info "Generating grub/${CORE_NAME}"
grub-mkimage \
--compression=auto \
--format "${target}" \
--directory "${GRUB_SRC}" \
--config "${ESP_DIR}/grub/load.cfg" \
--memdisk "${ESP_DIR}/grub/grub.cfg.tar" \
--output "${ESP_DIR}/${GRUB_DIR}/${CORE_NAME}" \
"${CORE_MODULES[@]}"
done
# Now target specific steps to make the system bootable
info "Installing MBR and the BIOS Boot partition."
cp "/usr/lib/grub/i386-pc/boot.img" "${ESP_DIR}/grub/i386-pc"
grub-bios-setup --device-map=$devmap \
--directory="${ESP_DIR}/grub/i386-pc" "${LOOP_DEV}"
# backup the MBR
dd bs=448 count=1 status=none if="${LOOP_DEV}" \
of="${ESP_DIR}/grub/mbr.bin"
info "Installing default x86_64 UEFI bootloader."
mkdir -p "${ESP_DIR}/EFI/boot"
cp "${ESP_DIR}/grub/x86_64-efi/core.efi" \
"${ESP_DIR}/EFI/boot/grubx64.efi"
cp "/shim/BOOTX64.EFI" \
"${ESP_DIR}/EFI/boot/bootx64.efi"
cleanup
trap - EXIT