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grub_install: new install script for grub, add UEFI bootloader
This script replaces the standard grub-install tool to give us some more control over what is going and ensure grub-install's auto-detection magic doesn't make any incorrect choices. Also this script sets up a loopback device and mounts the EFI partition in just the right way for grub-bios-setup's auto-detection magic to work correctly. I've chosen not to adapt disk_util to use partitioned loop devices to make grub happy because ensuring loop devices get cleaned up properly for the general case gets tricky and less robust.
This commit is contained in:
Michael Marineau
parent
f88778adee
commit
12a9900e02
@ -1,4 +1,8 @@
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# Use both default console and ttyS0
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# Load any and all video drivers.
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# Required under UEFI to boot Linux with a working console.
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insmod all_video
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# Use both default text console and ttyS0
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serial --unit=0 --speed=115200 --word=8 --parity=no --stop=1
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terminal_input console serial
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terminal_output console serial
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@ -6,4 +10,4 @@ terminal_output console serial
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# Re-use the existing syslinux configuration
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echo "Loading SYSLINUX configuration..."
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insmod syslinuxcfg
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syslinux_configfile -s /syslinux/syslinux.cfg
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syslinux_source -s /syslinux/syslinux.cfg
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127
build_library/grub_install.sh
Executable file
127
build_library/grub_install.sh
Executable file
@ -0,0 +1,127 @@
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#!/bin/bash
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# Copyright (c) 2014 The CoreOS Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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# Replacement script for 'grub-install' which does not detect drives
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# properly when partitions are mounted via individual loopback devices.
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SCRIPT_ROOT=$(readlink -f $(dirname "$0")/..)
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. "${SCRIPT_ROOT}/common.sh" || exit 1
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# We're invoked only by build_image, which runs in the chroot
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assert_inside_chroot
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# Flags.
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DEFINE_string target "" \
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"The GRUB target to install such as i386-pc or x86_64-efi"
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DEFINE_string esp_dir "" \
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"Path to EFI System partition mount point."
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DEFINE_string disk_image "" \
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"The disk image containing the EFI System partition."
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# Parse flags
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FLAGS "$@" || exit 1
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eval set -- "${FLAGS_ARGV}"
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switch_to_strict_mode
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# Our GRUB lives under coreos/grub so new pygrub versions cannot find grub.cfg
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GRUB_DIR="coreos/grub/${FLAGS_target}"
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# Assumes the ESP is the first partition, GRUB cannot search for it by type.
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GRUB_PREFIX="(,gpt1)/coreos/grub"
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# Modules required to find and read everything else from ESP
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CORE_MODULES=( fat part_gpt gzio )
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# Name of the core image, depends on target
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CORE_NAME=
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case "${FLAGS_target}" in
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i386-pc)
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CORE_MODULES+=( biosdisk )
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CORE_NAME="core.img"
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;;
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x86_64-efi)
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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 ${FLAGS_target}"
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;;
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esac
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# In order for grub-setup-bios to properly detect the layout of the disk
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# image it expects a normal partitioned block device. For most of the build
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# disk_util maps individual loop devices to each partition in the image so
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# the kernel can automatically detach the loop devices on unmount. When
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# using a single loop device with partitions there is no such cleanup.
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# That's the story of why this script has all this goo for loop and mount.
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STAGE_DIR=
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ESP_DIR=
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LOOP_DEV=
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cleanup() {
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if [[ -d "${STAGE_DIR}" ]]; then
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rm -rf "${STAGE_DIR}"
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fi
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if [[ -d "${ESP_DIR}" ]]; then
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if mountpoint -q "${ESP_DIR}"; then
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sudo umount "${ESP_DIR}"
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fi
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rm -rf "${ESP_DIR}"
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fi
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if [[ -b "${LOOP_DEV}" ]]; then
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sudo losetup --detach "${LOOP_DEV}"
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fi
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}
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trap cleanup EXIT
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STAGE_DIR=$(mktemp --directory)
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mkdir -p "${STAGE_DIR}/${GRUB_DIR}"
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info "Compressing modules in ${GRUB_DIR}"
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for file in "/usr/lib/grub/${FLAGS_target}"/*{.lst,.mod}; do
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out="${STAGE_DIR}/${GRUB_DIR}/${file##*/}"
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gzip --best --stdout "${file}" > "${out}"
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done
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info "Generating ${GRUB_DIR}/${CORE_NAME}"
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grub-mkimage \
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--compression=auto \
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--format "${FLAGS_target}" \
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--prefix "${GRUB_PREFIX}" \
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--output "${STAGE_DIR}/${GRUB_DIR}/${CORE_NAME}" \
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"${CORE_MODULES[@]}"
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info "Installing GRUB ${FLAGS_target} to ${FLAGS_disk_image##*/}"
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LOOP_DEV=$(sudo losetup --find --show --partscan "${FLAGS_disk_image}")
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ESP_DIR=$(mktemp --directory)
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sudo mount -t vfat "${LOOP_DEV}p1" "${ESP_DIR}"
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sudo cp -r "${STAGE_DIR}/." "${ESP_DIR}/."
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# This script will get called a few times, no need to re-copy grub.cfg
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if [[ ! -f "${ESP_DIR}/coreos/grub/grub.cfg" ]]; then
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info "Installing grub.cfg"
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sudo cp "${BUILD_LIBRARY_DIR}/grub.cfg" "${ESP_DIR}/coreos/grub/grub.cfg"
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fi
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# Now target specific steps to make the system bootable
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case "${FLAGS_target}" in
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i386-pc)
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info "Installing MBR and the BIOS Boot partition."
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sudo cp "/usr/lib/grub/i386-pc/boot.img" "${ESP_DIR}/${GRUB_DIR}"
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sudo grub-bios-setup --device-map=/dev/null \
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--directory="${ESP_DIR}/${GRUB_DIR}" "${LOOP_DEV}"
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;;
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x86_64-efi)
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info "Installing default x86_64 UEFI bootloader."
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sudo mkdir -p "${ESP_DIR}/EFI/boot"
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sudo cp "${STAGE_DIR}/${GRUB_DIR}/${CORE_NAME}" \
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"${ESP_DIR}/EFI/boot/bootx64.efi"
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;;
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esac
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cleanup
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trap - EXIT
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command_completed
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