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9d073452ed
Now with SYSLINUX 6 we can use the same bootloader on EFI and BIOS systems. This replaces our previous reliance on building default kernel options into the kernel image itself.
187 lines
5.2 KiB
Bash
Executable File
187 lines
5.2 KiB
Bash
Executable File
#!/bin/bash
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# Copyright (c) 2011 The Chromium OS 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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# Helper script to generate GRUB bootloader configuration files for
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# x86 platforms.
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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 arch "x86" \
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"The boot architecture: arm or x86. (Default: x86)"
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DEFINE_string boot_dir "/tmp/boot" \
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"Path to boot directory in root filesystem (Default: /tmp/boot)"
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DEFINE_string esp_dir "" \
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"Path to ESP partition mount point (Default: none)"
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DEFINE_string boot_args "" \
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"Additional boot arguments to pass to the commandline (Default: '')"
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DEFINE_string disk_layout "base" \
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"The disk layout type to use for this image."
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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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# Common kernel command-line args
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common_args="console=tty0 ro noswap cros_legacy"
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common_args="${common_args} ${FLAGS_boot_args}"
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# Get partition UUIDs from the json config
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get_uuid() {
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"${BUILD_LIBRARY_DIR}/disk_util" --disk_layout="${FLAGS_disk_layout}" \
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readuuid "$1"
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}
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# Filesystem args differ between the old and new usr layouts.
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if [[ "${FLAGS_disk_layout}" == *-usr ]]; then
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root_args="root=LABEL=ROOT rootflags=subvol=root"
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gptprio_args="${root_args} usr=gptprio:"
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slot_a_args="${root_args} usr=PARTUUID=$(get_uuid USR-A)"
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slot_b_args="${root_args} usr=PARTUUID=$(get_uuid USR-B)"
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else
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gptprio_args="root=gptprio:"
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slot_a_args="root=PARTUUID=$(get_uuid ROOT-A)"
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slot_b_args="root=PARTUUID=$(get_uuid ROOT-B)"
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fi
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GRUB_DIR="${FLAGS_boot_dir}/grub"
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SYSLINUX_DIR="${FLAGS_boot_dir}/syslinux"
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# Build configuration files for pygrub/pvgrub
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configure_grub() {
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sudo mkdir -p "${GRUB_DIR}"
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# Add hvc0 for hypervisors
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grub_args="${common_args} console=hvc0"
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sudo_clobber "${GRUB_DIR}/menu.lst.A" <<EOF
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timeout 0
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title CoreOS A Root
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root (hd0,0)
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kernel /syslinux/vmlinuz.A ${grub_args} ${slot_a_args}
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title CoreOS B Root
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root (hd0,0)
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kernel /syslinux/vmlinuz.B ${grub_args} ${slot_b_args}
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EOF
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info "Emitted ${GRUB_DIR}/menu.lst.A"
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sudo_clobber "${GRUB_DIR}/menu.lst.B" <<EOF
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default 1
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EOF
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sudo_append "${GRUB_DIR}/menu.lst.B" <"${GRUB_DIR}/menu.lst.A"
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info "Emitted ${GRUB_DIR}/menu.lst.B"
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sudo cp ${GRUB_DIR}/menu.lst.A ${GRUB_DIR}/menu.lst
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}
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# Build configuration files for syslinux
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configure_syslinux() {
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sudo mkdir -p "${SYSLINUX_DIR}"
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# Add ttyS0 as a secondary console, useful for qemu -nographic
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# This leaves /dev/console mapped to tty0 (vga) which is reasonable default.
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syslinux_args="console=ttyS0,115200n8 ${common_args}"
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sudo_clobber "${SYSLINUX_DIR}/syslinux.cfg" <<EOF
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SERIAL 0 115200
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PROMPT 0
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TIMEOUT 0
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# controls which kernel is the default
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include /syslinux/default.cfg
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include /syslinux/boot_kernel.cfg
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# coreos.A
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include /syslinux/root.A.cfg
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# coreos.B
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include /syslinux/root.B.cfg
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EOF
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info "Emitted ${SYSLINUX_DIR}/syslinux.cfg"
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sudo_clobber "${SYSLINUX_DIR}/default.cfg" <<EOF
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DEFAULT boot_kernel
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EOF
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info "Emitted ${SYSLINUX_DIR}/default.cfg"
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sudo_clobber "${SYSLINUX_DIR}/default.cfg.A" <<EOF
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DEFAULT coreos.A
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EOF
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info "Emitted ${SYSLINUX_DIR}/default.cfg.A"
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sudo_clobber "${SYSLINUX_DIR}/default.cfg.B" <<EOF
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DEFAULT coreos.B
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EOF
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info "Emitted ${SYSLINUX_DIR}/default.cfg.B"
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# Different files are used so that the updater can only touch the file it
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# needs to for a given change. This will minimize any potential accidental
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# updates issues, hopefully.
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sudo_clobber "${SYSLINUX_DIR}/boot_kernel.cfg" <<EOF
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label boot_kernel
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menu label boot_kernel
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kernel vmlinuz-boot_kernel
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append ${syslinux_args} ${gptprio_args}
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EOF
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info "Emitted ${SYSLINUX_DIR}/boot_kernel.cfg"
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sudo_clobber "${SYSLINUX_DIR}/root.A.cfg" <<EOF
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label coreos.A
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menu label coreos.A
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kernel vmlinuz.A
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append ${syslinux_args} ${slot_a_args}
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EOF
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info "Emitted ${SYSLINUX_DIR}/root.A.cfg"
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sudo_clobber "${SYSLINUX_DIR}/root.B.cfg" <<EOF
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label coreos.B
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menu label coreos.B
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kernel vmlinuz.B
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append ${syslinux_args} ${slot_b_args}
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EOF
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info "Emitted ${SYSLINUX_DIR}/root.B.cfg"
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}
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# Copy configurations to the ESP, this is what is actually used to boot
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copy_to_esp() {
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if ! mountpoint -q "${FLAGS_esp_dir}"; then
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die "${FLAGS_esp_dir} is not a mount point."
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fi
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sudo mkdir -p "${FLAGS_esp_dir}"/{syslinux,boot/grub,EFI/boot}
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sudo cp -r "${GRUB_DIR}/." "${FLAGS_esp_dir}/boot/grub"
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sudo cp -r "${SYSLINUX_DIR}/." "${FLAGS_esp_dir}/syslinux"
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# Install UEFI bootloader
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sudo cp /usr/share/syslinux/efi64/ldlinux.e64 \
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"${FLAGS_esp_dir}/EFI/boot/ldlinux.e64"
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sudo cp /usr/share/syslinux/efi64/syslinux.efi \
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"${FLAGS_esp_dir}/EFI/boot/bootx64.efi"
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# Stage all kernels with the only one we built.
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for kernel in syslinux/{vmlinuz-boot_kernel,vmlinuz.A,vmlinuz.B}
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do
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sudo cp "${FLAGS_boot_dir}/vmlinuz" "${FLAGS_esp_dir}/${kernel}"
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done
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}
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if [[ "${FLAGS_arch}" = "x86" || "${FLAGS_arch}" = "amd64" ]]; then
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configure_grub
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configure_syslinux
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if [[ -n "${FLAGS_esp_dir}" ]]; then
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copy_to_esp
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fi
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else
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error "No bootloader configuration for ${FLAGS_arch}"
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fi
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