grub/util/grub-reboot.in
Colin Watson cf2fd2a6d1 2010-10-05 Jordan Uggla <jordan.uggla@gmail.com>
2010-10-05  Colin Watson  <cjwatson@ubuntu.com>

	* util/grub-reboot.in: Make sure prev_saved_entry always gets a
	non-empty value.
2010-01-05 11:16:42 +00:00

108 lines
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#! /bin/sh
#
# Set a default boot entry for GRUB, for the next boot only.
# 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.
transform="@program_transform_name@"
prefix=@prefix@
exec_prefix=@exec_prefix@
bindir=@bindir@
grub_editenv=${bindir}/`echo grub-editenv | sed ${transform}`
rootdir=
# Usage: usage
# Print the usage.
usage () {
cat <<EOF
Usage: $0 [OPTION] entry
Set the default boot entry for GRUB, for the next boot only.
-h, --help print this message and exit
-v, --version print the version information and exit
--root-directory=DIR expect GRUB images under the directory DIR
instead of the root directory
ENTRY is a number or a menu item title.
Report bugs to <bug-grub@gnu.org>.
EOF
}
# Check the arguments.
for option in "$@"; do
case "$option" in
-h | --help)
usage
exit 0 ;;
-v | --version)
echo "grub-reboot (GNU GRUB ${PACKAGE_VERSION})"
exit 0 ;;
--root-directory=*)
rootdir=`echo "$option" | sed 's/--root-directory=//'` ;;
-*)
echo "Unrecognized option \`$option'" 1>&2
usage
exit 1
;;
*)
if test "x$entry" != x; then
echo "More than one entry?" 1>&2
usage
exit 1
fi
entry="${option}" ;;
esac
done
if test "x$entry" = x; then
echo "entry not specified." 1>&2
usage
exit 1
fi
# Initialize these directories here, since ROOTDIR was initialized.
case "$host_os" in
netbsd* | openbsd*)
# Because /boot is used for the boot block in NetBSD and OpenBSD, use /grub
# instead of /boot/grub.
grub_prefix=`echo /grub | sed ${transform}`
bootdir=${rootdir}
;;
*)
# Use /boot/grub by default.
bootdir=${rootdir}/boot
;;
esac
grubdir=${bootdir}/`echo grub | sed ${transform}`
prev_saved_entry=`$grub_editenv ${grubdir}/grubenv list | sed -n 's/^saved_entry=//p'`
if [ "$prev_saved_entry" ]; then
$grub_editenv ${grubdir}/grubenv set prev_saved_entry="$prev_saved_entry"
else
# We need some non-empty value for prev_saved_entry so that GRUB will
# recognise that grub-reboot has been used and restore the previous
# saved entry. "0" is the same as an empty value, i.e. the first menu
# entry.
$grub_editenv ${grubdir}/grubenv set prev_saved_entry=0
fi
$grub_editenv ${grubdir}/grubenv set saved_entry="$entry"
# Bye.
exit 0