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https://github.com/flatcar/scripts.git
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4057d5590d
As outlined here we need a new partition layout, this patch makes the necessary changes: https://groups.google.com/forum/#!topic/coreos-dev/bA7gwGGoTng The first big change is making all of the scripts obey partition numbers based on labels in the disk_layout.json. This makes it much easier to change later on. The second big change is in the layout itself. The json file was updated to reflect the document above. And finally the grub boot configuration needed for pv-grub and pygrub were added to the create_legacy_bootloader_templates.sh library utlity. Everything seems to work and boot now.
202 lines
6.8 KiB
Bash
Executable File
202 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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# 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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# TODO: For some reason the /dev/disk/by-uuid is not being generated by udev
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# in the initramfs. When we figure that out, switch to root=UUID=${UUID}.
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sudo mkdir -p ${FLAGS_to}
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# Build configuration files for pygrub/pvgrub
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GRUB_DIR="${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=HDROOTA 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=HDROOTB 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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# HDROOTA will be replaced in image_to_vm.sh
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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=HDROOTA 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=HDROOTB 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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