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
  26 grub_editenv=${bindir}/`echo grub-editenv | sed ${transform}`
  27 rootdir=
  28
  29 # Usage: usage
  30 # Print the usage.
  31 usage () {
  32     cat <<EOF
  33 Usage: $0 [OPTION] entry
  34 Set the default boot entry for GRUB, for the next boot only.
  35
  36   -h, --help              print this message and exit
  37   -v, --version           print the version information and exit
  38   --root-directory=DIR    expect GRUB images under the directory DIR
  39                           instead of the root directory
  40
  41 ENTRY is a number or a menu item title.
  42
  43 Report bugs to <bug-grub@gnu.org>.
  44 EOF
  45 }
  46
  47 # Check the arguments.
  48 while test $# -gt 0
  49 do
  50     option=$1
  51     shift
  52
  53     case "$option" in
  54     -h | --help)
  55         usage
  56         exit 0 ;;
  57     -v | --version)
  58         echo "grub-reboot (GNU GRUB ${PACKAGE_VERSION})"
  59         exit 0 ;;
  60
  61     --root-directory)
  62         rootdir=$1; shift ;;
  63     --root-directory=*)
  64         rootdir=`echo "$option" | sed 's/--root-directory=//'` ;;
  65
  66     -*)
  67         echo "Unrecognized option \`$option'" 1>&2
  68         usage
  69         exit 1
  70         ;;
  71     *)
  72         if test "x$entry" != x; then
  73             echo "More than one entry?" 1>&2
  74             usage
  75             exit 1
  76         fi
  77         entry="${option}" ;;
  78     esac
  79 done
  80
  81 if test "x$entry" = x; then
  82     echo "entry not specified." 1>&2
  83     usage
  84     exit 1
  85 fi
  86
  87 # Initialize these directories here, since ROOTDIR was initialized.
  88 case "$host_os" in
  89 netbsd* | openbsd*)
  90     # Because /boot is used for the boot block in NetBSD and OpenBSD, use /grub
  91     # instead of /boot/grub.
  92     grub_prefix=`echo /grub | sed ${transform}`
  93     bootdir=${rootdir}
  94     ;;
  95 *)
  96     # Use /boot/grub by default.
  97     bootdir=${rootdir}/boot
  98     ;;
  99 esac
 100
 101 grubdir=${bootdir}/`echo grub | sed ${transform}`
 102
 103 prev_saved_entry=`$grub_editenv ${grubdir}/grubenv list | sed -n 's/^saved_entry=//p'`
 104 if [ "$prev_saved_entry" ]; then
 105     $grub_editenv ${grubdir}/grubenv set prev_saved_entry="$prev_saved_entry"
 106 else
 107     # We need some non-empty value for prev_saved_entry so that GRUB will
 108     # recognise that grub-reboot has been used and restore the previous
 109     # saved entry. "0" is the same as an empty value, i.e. the first menu
 110     # entry.
 111     $grub_editenv ${grubdir}/grubenv set prev_saved_entry=0
 112 fi
 113 $grub_editenv ${grubdir}/grubenv set saved_entry="$entry"
 114
 115 # Bye.
 116 exit 0