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81afa4f300
Useful for qemu -nographic or any any other situation where serial is easier to get at than VGA. It may be possible that in some setups ttyS0 isn't appropriate but we can figure out a way to customize kernel options if/when that ever comes up.
150 lines
4.6 KiB
Bash
Executable File
150 lines
4.6 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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# 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} ${FLAGS_boot_args}"
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# Populate the x86 rootfs to support legacy and EFI bios config templates.
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# The templates are used by the installer to populate partition 12 with
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# the correct bootloader configuration.
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if [[ "${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 "${GRUB_DIR}"
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# Add hvc0 for hypervisors
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grub_args="${common_args} console=hvc0"
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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 Kernel
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root (hd0,0)
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kernel /syslinux/vmlinuz.A ${grub_args} root=gptprio:
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title CoreOS B Kernel
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root (hd0,0)
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kernel /syslinux/vmlinuz.B ${grub_args} root=gptprio:
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title CoreOS bootengine
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root (hd0,0)
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kernel /syslinux/vmlinuz-boot_kernel ${grub_args} root=gptprio:
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title CoreOS A Root Rescue
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root (hd0,0)
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kernel /syslinux/vmlinuz.A ${grub_args} root=${ROOTA}
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title CoreOS B Root Rescue
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root (hd0,0)
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kernel /syslinux/vmlinuz.B ${grub_args} root=${ROOTB}
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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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# 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 ${common_args}"
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cat <<EOF | sudo dd of="${SYSLINUX_DIR}/syslinux.cfg" 2>/dev/null
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SERIAL 0 115200
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PROMPT 0
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TIMEOUT 0
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DEFAULT boot_kernel
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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 ${SYSLINUX_DIR}/syslinux.cfg"
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# Different files are used so that the updater can only touch the file it
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# needs to for a given change. This will minimize any potential accidental
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# updates issues, hopefully.
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cat <<EOF | sudo dd of="${SYSLINUX_DIR}/boot_kernel.cfg" 2>/dev/null
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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} root=gptprio:
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EOF
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info "Emitted ${SYSLINUX_DIR}/boot_kernel.cfg"
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cat <<EOF | sudo dd of="${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 ${syslinux_args} root=${ROOTA}
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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 ${syslinux_args} root=${ROOTB}
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EOF
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info "Emitted ${SYSLINUX_DIR}/root.B.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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