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| 1 #!/bin/sh -u |
| 2 # Copyright (c) 2010 The Chromium OS Authors. All rights reserved. |
| 3 # Use of this source code is governed by a BSD-style license that can be |
| 4 # found in the LICENSE file. |
| 5 # |
| 6 # A script to display or change the preferred image |
| 7 |
| 8 # Load functions and constants for chromeos-install. |
| 9 . "$(dirname "$0")/chromeos-common.sh" || exit 1 |
| 10 . /usr/lib/shflags || exit 1 |
| 11 |
| 12 |
| 13 # The default device is the one we booted from. |
| 14 ROOTDEV=$(rootdev) |
| 15 # From root partition to root block device. |
| 16 DEFAULT_DST=$(get_block_dev_from_partition_dev ${ROOTDEV}) |
| 17 |
| 18 DEFINE_string dst "${DEFAULT_DST}" "Boot device to update" |
| 19 DEFINE_boolean run_as_root ${FLAGS_FALSE} \ |
| 20 "Allow root to run this script (Careful, it won't prompt for a password!)" |
| 21 |
| 22 # Parse command line |
| 23 FLAGS "$@" || exit 1 |
| 24 eval set -- "${FLAGS_ARGV}" |
| 25 |
| 26 set -e |
| 27 |
| 28 # Validate args. |
| 29 if [ -n "${@:-}" ]; then |
| 30 if [ "$1" = "0" ] || [ "$1" = "A" ] || [ "$1" = "a" ]; then |
| 31 newimg=0 |
| 32 elif [ "$1" = "1" ] || [ "$1" = "B" ] || [ "$1" = "b" ]; then |
| 33 newimg=1 |
| 34 else |
| 35 echo "Usage: $0 [A|B]" 1>&2 |
| 36 exit 1 |
| 37 fi |
| 38 fi |
| 39 |
| 40 |
| 41 # Don't run this as root |
| 42 dont_run_as_root |
| 43 |
| 44 # Check out the dst device. |
| 45 if [ ! -b "$FLAGS_dst" ] |
| 46 then |
| 47 echo "Error: Unable to find block device: $FLAGS_dst" |
| 48 exit 1 |
| 49 fi |
| 50 |
| 51 |
| 52 # Mount the EFI System Partition |
| 53 mountpoint=$(mktemp -d /tmp/mountesp_XXXXXXXXX) |
| 54 tempfile=$(mktemp /tmp/grubcfg_XXXXXXXXX) |
| 55 sudo mount ${FLAGS_dst}12 ${mountpoint} |
| 56 |
| 57 # Make the change |
| 58 if [ -n "${newimg:-}" ]; then |
| 59 sed -e "s/^set default=.*/set default=$newimg/" \ |
| 60 ${mountpoint}/efi/boot/grub.cfg > ${tempfile} |
| 61 sudo cp ${tempfile} ${mountpoint}/efi/boot/grub.cfg |
| 62 fi |
| 63 |
| 64 # Print the [new] default choice |
| 65 grep -qs '^set default=0' ${mountpoint}/efi/boot/grub.cfg && echo "A" |
| 66 grep -qs '^set default=1' ${mountpoint}/efi/boot/grub.cfg && echo "B" |
| 67 |
| 68 # Clean up |
| 69 sudo umount ${mountpoint} |
| 70 rm -f ${tempfile} |
| 71 rmdir ${mountpoint} |
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