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https://github.com/flatcar/scripts.git
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3fa29024e1
Make use of the new partition UUIDs for ROOT-A and ROOT-B in the root= kernel parameters provided by the legacy (non-kexec) bootloaders. This makes all of our images bootable as-is without having to pass them through image_to_vm.sh. :-D
205 lines
6.8 KiB
Bash
Executable File
205 lines
6.8 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 to "/tmp/boot" \
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"Path to populate with bootloader templates (Default: /tmp/boot)"
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DEFINE_string usb_disk /dev/sdb3 \
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"Path syslinux should use to do a usb boot. Default: /dev/sdb3"
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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_boolean enable_bootcache ${FLAGS_FALSE} \
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"Default all bootloaders to NOT use boot cache."
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DEFINE_boolean enable_rootfs_verification ${FLAGS_FALSE} \
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"Controls if verity is used for root filesystem checking (Default: false)"
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DEFINE_integer verity_error_behavior 3 \
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"Verified boot error behavior [0: I/O errors, 1: reboot, 2: nothing] \
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(Default: 3)"
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DEFINE_integer verity_max_ios -1 \
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"Optional number of outstanding I/O operations. (Default: 1024)"
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# Parse flags
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FLAGS "$@" || exit 1
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eval set -- "${FLAGS_ARGV}"
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switch_to_strict_mode
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# Useful for getting partition UUID values
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. "${BUILD_LIBRARY_DIR}/disk_layout_util.sh" || exit 1
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# Only let dm-verity block if rootfs verification is configured.
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# Also, set which device mapper correspondes to verity
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dev_wait=0
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ROOTDEV=/dev/dm-0
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if [[ ${FLAGS_enable_rootfs_verification} -eq ${FLAGS_TRUE} ]]; then
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dev_wait=1
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if [[ ${FLAGS_enable_bootcache} -eq ${FLAGS_TRUE} ]]; then
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ROOTDEV=/dev/dm-1
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fi
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fi
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# Common kernel command-line args
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common_args="init=/sbin/init console=tty0 boot=local rootwait ro noresume"
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common_args="${common_args} noswap ${FLAGS_boot_args}"
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# Common verified boot command-line args
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verity_common="dm_verity.error_behavior=${FLAGS_verity_error_behavior}"
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verity_common="${verity_common} dm_verity.max_bios=${FLAGS_verity_max_ios}"
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# Ensure that dm-verity waits for its device.
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# TODO(wad) should add a timeout that display a useful message
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verity_common="${verity_common} dm_verity.dev_wait=${dev_wait}"
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# Populate the x86 rootfs to support legacy and EFI bios config templates.
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# The templates are used by the installer to populate partition 12 with
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# the correct bootloader configuration.
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if [[ "${FLAGS_arch}" = "x86" || "${FLAGS_arch}" = "amd64" ]]; then
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sudo mkdir -p ${FLAGS_to}
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# Get partition UUIDs from the json config
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ROOTA="PARTUUID=$(get_uuid base ROOT-A)"
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ROOTB="PARTUUID=$(get_uuid base ROOT-B)"
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# Build configuration files for pygrub/pvgrub
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GRUB_DIR="${FLAGS_to}/boot/grub"
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sudo mkdir -p "${GRUB_DIR}"
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cat <<EOF | sudo dd of="${GRUB_DIR}/menu.lst.A" 2>/dev/null
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timeout 0
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title CoreOS A
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root (hd0,0)
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kernel /syslinux/vmlinuz.A ${common_args} root=${ROOTA} cros_legacy
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title CoreOS B
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root (hd0,0)
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kernel /syslinux/vmlinuz.B ${common_args} root=${ROOTB} cros_legacy
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EOF
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info "Emitted ${GRUB_DIR}/menu.lst.A"
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cat <<EOF | sudo dd of="${GRUB_DIR}/menu.lst.B" 2>/dev/null
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default 1
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EOF
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sudo sh -c "cat ${GRUB_DIR}/menu.lst.A >> ${GRUB_DIR}/menu.lst.B"
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info "Emitted ${GRUB_DIR}/menu.lst.B"
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sudo cp ${GRUB_DIR}/menu.lst.A ${GRUB_DIR}/menu.lst
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# /boot/syslinux must be installed in partition 12 as /syslinux/.
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SYSLINUX_DIR="${FLAGS_to}/syslinux"
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sudo mkdir -p "${SYSLINUX_DIR}"
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cat <<EOF | sudo dd of="${SYSLINUX_DIR}/syslinux.cfg" 2>/dev/null
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PROMPT 0
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TIMEOUT 0
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# the actual target
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include /syslinux/default.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 ${SYSLINUX_DIR}/syslinux.cfg"
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# To change the active target, only this file needs to change.
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cat <<EOF | sudo dd of="${SYSLINUX_DIR}/default.cfg" 2>/dev/null
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DEFAULT coreos.A
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EOF
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info "Emitted ${SYSLINUX_DIR}/default.cfg"
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# Different files are used so that the updater can only touch the file it
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# needs to for a given change. This will minimize any potential accidental
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# updates issues, hopefully.
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cat <<EOF | sudo dd of="${SYSLINUX_DIR}/root.A.cfg" 2>/dev/null
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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 ${common_args} root=${ROOTA} i915.modeset=1 cros_legacy
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EOF
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info "Emitted ${SYSLINUX_DIR}/root.A.cfg"
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cat <<EOF | sudo dd of="${SYSLINUX_DIR}/root.B.cfg" 2>/dev/null
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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 ${common_args} root=${ROOTB} i915.modeset=1 cros_legacy
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EOF
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info "Emitted ${SYSLINUX_DIR}/root.B.cfg"
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cat <<EOF | sudo dd of="${SYSLINUX_DIR}/README" 2>/dev/null
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Partition 12 contains the active bootloader configuration when
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booting from a non-Chrome OS BIOS. EFI BIOSes use /efi/*
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and legacy BIOSes use this syslinux configuration.
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EOF
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info "Emitted ${SYSLINUX_DIR}/README"
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# To cover all of our bases, now populate templated boot support for efi.
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sudo mkdir -p "${FLAGS_to}"/efi/boot
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if [[ -f /bin/grub2-mkimage ]];then
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# Use the newer grub2 1.99+
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sudo grub2-mkimage -p /efi/boot -O x86_64-efi \
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-o "${FLAGS_to}/efi/boot/bootx64.efi" \
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part_gpt fat ext2 hfs hfsplus normal boot chain configfile linux
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else
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# Remove this else case after a few weeks (sometime in Dec 2011)
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sudo grub-mkimage -p /efi/boot -o "${FLAGS_to}/efi/boot/bootx64.efi" \
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part_gpt fat ext2 normal boot sh chain configfile linux
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fi
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# Templated variables:
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# DMTABLEA, DMTABLEB -> '0 xxxx verity ... '
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# This should be replaced during postinst when updating the ESP.
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cat <<EOF | sudo dd of="${FLAGS_to}/efi/boot/grub.cfg" 2>/dev/null
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set default=0
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set timeout=2
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# NOTE: These magic grub variables are a Chrome OS hack. They are not portable.
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menuentry "local image A" {
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linux \$grubpartA/boot/vmlinuz ${common_args} i915.modeset=1 cros_efi root=/dev/\$linuxpartA
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}
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menuentry "local image B" {
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linux \$grubpartB/boot/vmlinuz ${common_args} i915.modeset=1 cros_efi root=/dev/\$linuxpartB
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}
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menuentry "verified image A" {
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linux \$grubpartA/boot/vmlinuz ${common_args} ${verity_common} \
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i915.modeset=1 cros_efi root=${ROOTDEV} dm=\\"DMTABLEA\\"
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}
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menuentry "verified image B" {
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linux \$grubpartB/boot/vmlinuz ${common_args} ${verity_common} \
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i915.modeset=1 cros_efi root=${ROOTDEV} dm=\\"DMTABLEB\\"
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}
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# FIXME: usb doesn't support verified boot for now
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menuentry "Alternate USB Boot" {
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linux (hd0,3)/boot/vmlinuz ${common_args} root=/dev/sdb3 i915.modeset=1 cros_efi
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}
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EOF
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if [[ ${FLAGS_enable_rootfs_verification} -eq ${FLAGS_TRUE} ]]; then
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sudo sed -i -e 's/^set default=.*/set default=2/' \
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"${FLAGS_to}/efi/boot/grub.cfg"
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fi
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info "Emitted ${FLAGS_to}/efi/boot/grub.cfg"
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exit 0
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fi
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info "The target platform does not use bootloader templates."
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