iankelling.org Git - automated-distro-installer/blob - fai/config/files/boot/chboot/DEFAULT

   1 #!/bin/bash
   2 # Copyright (C) 2016 Ian Kelling
   3
   4 # This program is free software; you can redistribute it and/or
   5 # modify it under the terms of the GNU General Public License
   6 # as published by the Free Software Foundation; either version 2
   7 # of the License, or (at your option) any later version.
   8
   9 # This program is distributed in the hope that it will be useful,
  10 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 # GNU General Public License for more details.
  13
  14 # You should have received a copy of the GNU General Public License
  15 # along with this program; if not, write to the Free Software
  16 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  17
  18
  19 set -eE -o pipefail
  20 trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?" >&2' ERR
  21
  22 [[ $EUID == 0 ]] || exec sudo "$BASH_SOURCE" "$@"
  23
  24 usage() {
  25     cat <<EOF
  26 Usage: ${0##*/} [OPTIONS] DISTRO_NAME
  27 Set grub to boot into a different distro, and reboot unless -r
  28
  29 With no argument, print available distros
  30 DISTRO_NAME is based on the partition names in /boot.
  31 For example, boot_debianjessie.
  32
  33 For a system without libreboot, which is failing completely to
  34 boot on one distro, here is how I did a chboot for it:
  35 # arch-pxe had been run previously
  36 pxe-server treetowl arch
  37 # reboot treetowl into arch live env
  38 pxe-server # disable pxe server
  39 ssh root@treetowl
  40 lsblk # identify boot dev. if boot dev is a raid, this could be repeated on all boot devs.
  41 mount /dev/sdd3 /mnt
  42 mount_point=/mnt/boot_debiantesting # the subvol i want to chboot to
  43 boot_disk=/dev/sdd
  44 grub-bios-setup -d $mount_point/grub/i386-pc -s -m $mount_point/grub/device.map $boot_disk
  45 reboot
  46
  47 todo: figure out if it's possible to make a multi-distro grub like I have with libreboot
  48 for non-libreboot systems
  49
  50 -r         Do not reboot.
  51 -d         Enable debug output.
  52 -h|--help  Print help and exit.
  53
  54 Note: Uses GNU getopt options parsing style
  55 EOF
  56     exit $1
  57 }
  58
  59
  60 grub_extn=4
  61
  62 ###### begin command line parsing #####
  63 reboot=true
  64 temp=$(getopt -l help hdr "$@") || usage 1
  65 eval set -- "$temp"
  66 while true; do
  67     case $1 in
  68         -d) set -x; shift ;;
  69         -r) reboot=false; shift ;;
  70         -h|--help) usage ;;
  71         --) shift; break ;;
  72         *) echo "$0: Internal error!" ; exit 1 ;;
  73     esac
  74 done
  75
  76
  77 distro=$1
  78
  79 mnt=/boot
  80 if ! mountpoint $mnt &>/dev/null; then
  81     mnt=/
  82 fi
  83
  84 if [[ ! $distro ]]; then
  85     echo "available distros:"
  86     cur=$(btrfs subvol show $mnt| sed -rn 's/^.*Name:\s*(\S*).*/\1/p')
  87     btrfs subvolume list $mnt | awk '{print $9}' | sed "s/$cur/$cur (current)/"
  88     exit 0
  89 fi
  90
  91 ###### end command line parsing #####
  92
  93
  94 #### begin initial error checking #####
  95
  96 if ! btrfs subvolume list $mnt | grep "$distro$" &>/dev/null; then
  97     echo "$0: error: $distro not found in btrfs subvolume list $mnt:"
  98     btrfs subvolume list $mnt
  99     exit 1
 100 fi
 101
 102 #### end initial error checking #####
 103
 104 e() { echo "$@"; "$@"; }
 105
 106 boot_dev=$(mount | sed -rn "s#^(\S+) on $mnt .*#\1#p")
 107
 108 mount_point=$(mktemp -d)
 109
 110 e mount -o subvol=$distro $boot_dev $mount_point
 111
 112 boot_disk=${boot_dev%%[0-9]*}
 113
 114 # arch doesn't have $mount_point/grub/device.map, accoring to the grub manual,
 115 # it just generates one if the file doesn't exist.
 116 # https://www.gnu.org/software/grub/manual/html_node/Device-map.html
 117 e grub-bios-setup -d $mount_point/grub/i386-pc -s -m $mount_point/grub/device.map $boot_disk
 118
 119 e umount $mount_point
 120
 121 e mount $boot_disk$grub_extn $mount_point
 122 e grub-editenv $mount_point/grubenv set last_boot=/$distro
 123 e grub-editenv $mount_point/grubenv set did_fai_check=true
 124 e umount $mount_point
 125 e rmdir $mount_point
 126
 127 if $reboot; then
 128     touch /tmp/keyscript-off
 129     reboot now
 130 fi