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 bootdir=
  33 grubdir=`echo "/@bootdirname@/@grubdirname@" | sed 's,//*,/,g'`
  34
  35 # Usage: usage
  36 # Print the usage.
  37 usage () {
  38     cat <<EOF
  39 Usage: $self [OPTION] entry
  40 Set the default boot entry for GRUB, for the next boot only.
  41
  42   -h, --help              print this message and exit
  43   -v, --version           print the version information and exit
  44   --boot-directory=DIR    expect GRUB images under the directory DIR/@grubdirname@
  45                           instead of the $grubdir directory
  46
  47 ENTRY is a number or a menu item title.
  48
  49 Report bugs to <bug-grub@gnu.org>.
  50 EOF
  51 }
  52
  53 argument () {
  54   opt=$1
  55   shift
  56
  57   if test $# -eq 0; then
  58       echo "$0: option requires an argument -- '$opt'" 1>&2
  59       exit 1
  60   fi
  61   echo $1
  62 }
  63
  64 # Check the arguments.
  65 while test $# -gt 0
  66 do
  67     option=$1
  68     shift
  69
  70     case "$option" in
  71     -h | --help)
  72         usage
  73         exit 0 ;;
  74     -v | --version)
  75         echo "$self (${PACKAGE_NAME}) ${PACKAGE_VERSION}"
  76         exit 0 ;;
  77
  78 # Accept for compatibility
  79     --root-directory)
  80         rootdir=`argument $option "$@"`; shift ;;
  81     --root-directory=*)
  82         rootdir=`echo "$option" | sed 's/--root-directory=//'` ;;
  83
  84     --boot-directory)
  85     bootdir=`argument $option "$@"`; shift;;
  86     --boot-directory=*)
  87     bootdir=`echo "$option" | sed 's/--boot-directory=//'` ;;
  88
  89     -*)
  90         echo "Unrecognized option \`$option'" 1>&2
  91         usage
  92         exit 1
  93         ;;
  94     *)
  95         if test "x$entry" != x; then
  96             echo "More than one entry?" 1>&2
  97             usage
  98             exit 1
  99         fi
 100         entry="${option}" ;;
 101     esac
 102 done
 103
 104 if test "x$entry" = x; then
 105     echo "entry not specified." 1>&2
 106     usage
 107     exit 1
 108 fi
 109
 110 if [ -z "$bootdir" ]; then
 111     # Default bootdir if bootdir not initialized.
 112     bootdir=/@bootdirname@
 113
 114     if [ -n "$rootdir" ] ; then
 115         # Initialize bootdir if rootdir was initialized.
 116         bootdir=${rootdir}/@bootdirname@
 117     fi
 118 fi
 119
 120 grubdir=`echo "${bootdir}/@grubdirname@" | sed 's,//*,/,g'`
 121
 122 prev_saved_entry=`$grub_editenv ${grubdir}/grubenv list | sed -n 's/^saved_entry=//p'`
 123 if [ "$prev_saved_entry" ]; then
 124     $grub_editenv ${grubdir}/grubenv set prev_saved_entry="$prev_saved_entry"
 125 else
 126     # We need some non-empty value for prev_saved_entry so that GRUB will
 127     # recognise that grub-reboot has been used and restore the previous
 128     # saved entry. "0" is the same as an empty value, i.e. the first menu
 129     # entry.
 130     $grub_editenv ${grubdir}/grubenv set prev_saved_entry=0
 131 fi
 132 $grub_editenv ${grubdir}/grubenv set saved_entry="$entry"
 133
 134 # Bye.
 135 exit 0