util/grub-reboot.in

   1 #! /bin/sh
   2 #
   3 # Set a default boot entry for GRUB, for the next boot only.
   4 # Copyright (C) 2004,2009  Free Software Foundation, Inc.
   5 #
   6 # GRUB is free software: you can redistribute it and/or modify
   7 # it under the terms of the GNU General Public License as published by
   8 # the Free Software Foundation, either version 3 of the License, or
   9 # (at your option) any later version.
  10 #
  11 # GRUB is distributed in the hope that it will be useful,
  12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 # GNU General Public License for more details.
  15 #
  16 # You should have received a copy of the GNU General Public License
  17 # along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
  18
  19 # Initialize some variables.
  20 transform="@program_transform_name@"
  21
  22 prefix=@prefix@
  23 exec_prefix=@exec_prefix@
  24 bindir=@bindir@
  25 PACKAGE_NAME=@PACKAGE_NAME@
  26 PACKAGE_VERSION=@PACKAGE_VERSION@
  27
  28 self=`basename $0`
  29
  30 grub_editenv=${bindir}/`echo grub-editenv | sed ${transform}`
  31 rootdir=
  32
  33 # Usage: usage
  34 # Print the usage.
  35 usage () {
  36     cat <<EOF
  37 Usage: $self [OPTION] entry
  38 Set the default boot entry for GRUB, for the next boot only.
  39
  40   -h, --help              print this message and exit
  41   -v, --version           print the version information and exit
  42   --root-directory=DIR    expect GRUB images under the directory DIR
  43                           instead of the root directory
  44
  45 ENTRY is a number or a menu item title.
  46
  47 Report bugs to <bug-grub@gnu.org>.
  48 EOF
  49 }
  50
  51 argument () {
  52   opt=$1
  53   shift
  54
  55   if test $# -eq 0; then
  56       echo "$0: option requires an argument -- '$opt'" 1>&2
  57       exit 1
  58   fi
  59   echo $1
  60 }
  61
  62 # Check the arguments.
  63 while test $# -gt 0
  64 do
  65     option=$1
  66     shift
  67
  68     case "$option" in
  69     -h | --help)
  70         usage
  71         exit 0 ;;
  72     -v | --version)
  73         echo "$self (${PACKAGE_NAME}) ${PACKAGE_VERSION}"
  74         exit 0 ;;
  75
  76     --root-directory)
  77         rootdir=`argument $option "$@"`; shift ;;
  78     --root-directory=*)
  79         rootdir=`echo "$option" | sed 's/--root-directory=//'` ;;
  80
  81     -*)
  82         echo "Unrecognized option \`$option'" 1>&2
  83         usage
  84         exit 1
  85         ;;
  86     *)
  87         if test "x$entry" != x; then
  88             echo "More than one entry?" 1>&2
  89             usage
  90             exit 1
  91         fi
  92         entry="${option}" ;;
  93     esac
  94 done
  95
  96 if test "x$entry" = x; then
  97     echo "entry not specified." 1>&2
  98     usage
  99     exit 1
 100 fi
 101
 102 # Initialize these directories here, since ROOTDIR was initialized.
 103 case "$host_os" in
 104 netbsd* | openbsd*)
 105     # Because /boot is used for the boot block in NetBSD and OpenBSD, use /grub
 106     # instead of /boot/grub.
 107     grub_prefix=`echo /grub | sed ${transform}`
 108     bootdir=${rootdir}
 109     ;;
 110 *)
 111     # Use /boot/grub by default.
 112     bootdir=${rootdir}/boot
 113     ;;
 114 esac
 115
 116 grubdir=${bootdir}/`echo grub | sed ${transform}`
 117
 118 prev_saved_entry=`$grub_editenv ${grubdir}/grubenv list | sed -n 's/^saved_entry=//p'`
 119 if [ "$prev_saved_entry" ]; then
 120     $grub_editenv ${grubdir}/grubenv set prev_saved_entry="$prev_saved_entry"
 121 else
 122     # We need some non-empty value for prev_saved_entry so that GRUB will
 123     # recognise that grub-reboot has been used and restore the previous
 124     # saved entry. "0" is the same as an empty value, i.e. the first menu
 125     # entry.
 126     $grub_editenv ${grubdir}/grubenv set prev_saved_entry=0
 127 fi
 128 $grub_editenv ${grubdir}/grubenv set saved_entry="$entry"
 129
 130 # Bye.
 131 exit 0