Drop unused legacy bootloader configuration

syslinux is still used, but only for the ISO with isohybrid and a
different configuration.

Xen now uses the newer pvgrub, which chainloads into GRUB 2.

Signed-off-by: James Le Cuirot <jlecuirot@microsoft.com>

build_library/build_image_util.sh

@@ -659,8 +659,6 @@ finish_image() {
   # Only configure bootloaders if there is a boot partition
   if mountpoint -q "${root_fs_dir}"/boot; then
     install_grub=1
-    ${BUILD_LIBRARY_DIR}/configure_bootloaders.sh \
-      --boot_dir="${root_fs_dir}"/usr/boot
 
     # Create first-boot flag for grub and Ignition
     info "Writing first-boot flag"

build_library/configure_bootloaders.sh

@@ -1,91 +0,0 @@
-#!/bin/bash
-
-# Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-# Helper script to generate bootloader configuration files for systems
-# that predate our new GRUB2 based gptprio bootloader.
-
-SCRIPT_ROOT=$(readlink -f $(dirname "$0")/..)
-. "${SCRIPT_ROOT}/common.sh" || exit 1
-
-# We're invoked only by build_image, which runs in the chroot
-assert_inside_chroot
-
-# Flags.
-DEFINE_string boot_dir "/tmp/boot" \
-  "Path to boot directory in root filesystem (Default: /tmp/boot)"
-
-# Parse flags
-FLAGS "$@" || exit 1
-eval set -- "${FLAGS_ARGV}"
-switch_to_strict_mode
-
-# Common kernel command-line args
-common_args="console=tty0 ro noswap cros_legacy"
-common_args="${common_args} ${FLAGS_boot_args}"
-
-# Filesystem command line args.
-root_args="root=LABEL=ROOT rootflags=subvol=root"
-slot_a_args="${root_args} usr=PARTLABEL=USR-A"
-slot_b_args="${root_args} usr=PARTLABEL=USR-B"
-
-GRUB_DIR="${FLAGS_boot_dir}/grub"
-SYSLINUX_DIR="${FLAGS_boot_dir}/syslinux"
-
-# Build configuration files for pygrub/pvgrub
-configure_pvgrub() {
-  info "Installing legacy PV-GRUB configuration"
-  sudo mkdir -p "${GRUB_DIR}"
-
-  # Add hvc0 for hypervisors
-  grub_args="${common_args} console=hvc0"
-
-  sudo_clobber "${GRUB_DIR}/menu.lst.A" <<EOF
-timeout         0
-
-title           Flatcar A Root
-root            (hd0,0)
-kernel          /syslinux/vmlinuz.A ${grub_args} ${slot_a_args}
-
-title           Flatcar B Root
-root            (hd0,0)
-kernel          /syslinux/vmlinuz.B ${grub_args} ${slot_b_args}
-EOF
-
-  sudo_clobber "${GRUB_DIR}/menu.lst.B" <<EOF
-default         1
-$(< "${GRUB_DIR}/menu.lst.A")
-EOF
-}
-
-# Build configuration files for syslinux
-configure_syslinux() {
-  info "Installing legacy SYSLINUX configuration"
-  sudo mkdir -p "${SYSLINUX_DIR}"
-
-  # Add ttyS0 as a secondary console, useful for qemu -nographic
-  # This leaves /dev/console mapped to tty0 (vga) which is reasonable default.
-  syslinux_args="console=ttyS0,115200n8 ${common_args}"
-
-  sudo_clobber "${SYSLINUX_DIR}/default.cfg.A" <<<"DEFAULT coreos.A"
-  sudo_clobber "${SYSLINUX_DIR}/default.cfg.B" <<<"DEFAULT coreos.B"
-
-  sudo_clobber "${SYSLINUX_DIR}/root.A.cfg" <<EOF
-label coreos.A
-  menu label coreos.A
-  kernel vmlinuz.A
-  append ${syslinux_args} ${slot_a_args}
-EOF
-
-  sudo_clobber "${SYSLINUX_DIR}/root.B.cfg" <<EOF
-label coreos.B
-  menu label coreos.B
-  kernel vmlinuz.B
-  append ${syslinux_args} ${slot_b_args}
-EOF
-}
-
-configure_pvgrub
-configure_syslinux