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Filename : grub-set-default
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#! /bin/sh
#
# Set a default boot entry for GRUB.
# Copyright (C) 2004,2009  Free Software Foundation, Inc.
#
# GRUB is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# GRUB is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with GRUB.  If not, see <http://www.gnu.org/licenses/>.

# Initialize some variables.
prefix=/usr
exec_prefix=/usr
bindir=${exec_prefix}/bin
sysconfdir="/etc"
PACKAGE_NAME=GRUB
PACKAGE_VERSION=2.06-2ubuntu7.2
datarootdir="/usr/share"
datadir="${datarootdir}"
if [ "x$pkgdatadir" = x ]; then
    pkgdatadir="${datadir}/grub"
fi

self=`basename $0`

grub_editenv=${bindir}/grub-editenv
rootdir=
bootdir=
grubdir=`echo "/boot/grub" | sed 's,//*,/,g'`

export TEXTDOMAIN=grub
export TEXTDOMAINDIR="${datarootdir}/locale"

. "${pkgdatadir}/grub-mkconfig_lib"

# Usage: usage
# Print the usage.
usage () {
    gettext_printf "Usage: %s [OPTION] MENU_ENTRY\n" "$self"
    gettext "Set the default boot menu entry for GRUB."; echo
    gettext_printf "This requires setting GRUB_DEFAULT=saved in %s/default/grub.\n" "$sysconfdir"
    echo
    print_option_help "-h, --help" "$(gettext "print this message and exit")"
    print_option_help "-V, --version" "$(gettext "print the version information and exit")"
    dirmsg="$(gettext_printf "expect GRUB images under the directory DIR/%s instead of the %s directory" "grub" "$grubdir")"
    print_option_help "--boot-directory=$(gettext "DIR")" "$dirmsg"
    echo
    gettext "MENU_ENTRY is a number, a menu item title or a menu item identifier."; echo
    echo
    gettext "Report bugs to <bug-grub@gnu.org>."; echo
}

argument () {
  opt=$1
  shift

  if test $# -eq 0; then
      gettext_printf "%s: option requires an argument -- \`%s'\n" "$self" "$opt" 1>&2
      exit 1
  fi
  echo $1
}

# Check the arguments.
while test $# -gt 0
do
    option=$1
    shift

    case "$option" in
    -h | --help)
	usage
	exit 0 ;;
    -V | --version)
	echo "$self (${PACKAGE_NAME}) ${PACKAGE_VERSION}"
	exit 0 ;;

# Accept for compatibility
    --root-directory)
	rootdir=`argument $option "$@"`; shift ;;
    --root-directory=*)
	rootdir=`echo "$option" | sed 's/--root-directory=//'` ;;

    --boot-directory)
    bootdir=`argument $option "$@"`; shift;;
    --boot-directory=*)
    bootdir=`echo "$option" | sed 's/--boot-directory=//'` ;;

    -*)
	gettext_printf "Unrecognized option \`%s'\n" "$option" 1>&2
	usage
	exit 1
	;;
    *)
	if test "x$entry" != x; then
	    gettext "More than one menu entry?" 1>&2
	    echo >&2
	    usage
	    exit 1
	fi
	entry="${option}" ;;
    esac
done

if test "x$entry" = x; then
    gettext "Menu entry not specified." 1>&2
    echo >&2
    usage
    exit 1
fi

if [ -z "$bootdir" ]; then
    # Default bootdir if bootdir not initialized.
    bootdir=/boot

    if [ -n "$rootdir" ] ; then
        # Initialize bootdir if rootdir was initialized.
        bootdir=${rootdir}/boot
    fi
fi

grubdir=`echo "${bootdir}/grub" | sed 's,//*,/,g'`

$grub_editenv ${grubdir}/grubenv unset prev_saved_entry
$grub_editenv ${grubdir}/grubenv unset next_entry
$grub_editenv ${grubdir}/grubenv set saved_entry="$entry"

# Bye.
exit 0