mirror of
https://github.com/flatcar/scripts.git
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5bfa0c8d20
The new grub install script must be called after the image is unmounted and the old bootloaders script doesn't need to touch grub at all. For now we will continue to use the existing syslinux configs but interpreted by grub. Beyond the grub menu flashing by during boot everything should still be functionally equivalent.
160 lines
4.5 KiB
Bash
Executable File
160 lines
4.5 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 "$1"
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}
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# Filesystem command line args.
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root_args="root=LABEL=ROOT rootflags=subvol=root"
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gptprio_args="${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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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_pvgrub() {
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info "Installing legacy PV-GRUB configuration"
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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} ${slot_b_args}
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EOF
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sudo_clobber "${GRUB_DIR}/menu.lst.B" <<EOF
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default 1
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$(< "${GRUB_DIR}/menu.lst.A")
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EOF
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sudo cp "${GRUB_DIR}/menu.lst.A" "${GRUB_DIR}/menu.lst"
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# menu.lst needs to go under boot/grub so pvgrub can find it reliably
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sudo mkdir -p "${FLAGS_esp_dir}/boot/grub"
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sudo cp "${GRUB_DIR}/menu.lst" "${FLAGS_esp_dir}/boot/grub"
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}
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# Build configuration files for syslinux
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configure_syslinux() {
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info "Installing legacy SYSLINUX configuration"
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sudo mkdir -p "${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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if [[ ${common_args} == *console=ttyS* ]] ; then
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syslinux_args="${common_args}"
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else
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syslinux_args="console=ttyS0,115200n8 ${common_args}"
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fi
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sudo_clobber "${SYSLINUX_DIR}/syslinux.cfg" <<EOF
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PROMPT 1
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# display boot: prompt for a half second
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TIMEOUT 5
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# never sit at the prompt longer than a minute
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TOTALTIMEOUT 600
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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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sudo_clobber "${SYSLINUX_DIR}/default.cfg" <<<"DEFAULT boot_kernel"
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sudo_clobber "${SYSLINUX_DIR}/default.cfg.A" <<<"DEFAULT coreos.A"
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sudo_clobber "${SYSLINUX_DIR}/default.cfg.B" <<<"DEFAULT coreos.B"
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# Different files are used so that the updater can only touch the file it
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# needs to for a given change. This will minimize any potential accidental
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# updates issues, hopefully.
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sudo_clobber "${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} ${gptprio_args}
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EOF
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sudo_clobber "${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} ${slot_a_args}
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EOF
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sudo_clobber "${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} ${slot_b_args}
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EOF
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sudo cp -r "${SYSLINUX_DIR}/." "${FLAGS_esp_dir}/syslinux"
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# Stage all kernels with the only one we built.
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for kernel in syslinux/{vmlinuz-boot_kernel,vmlinuz.A,vmlinuz.B}
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do
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sudo cp "${FLAGS_boot_dir}/vmlinuz" "${FLAGS_esp_dir}/${kernel}"
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done
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}
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[[ -d "${FLAGS_esp_dir}" ]] || die_notrace "--esp_dir is required"
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if [[ "${FLAGS_arch}" = "x86" || "${FLAGS_arch}" = "amd64" ]]; then
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configure_pvgrub
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configure_syslinux
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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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