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