cf2fd2a6d1
2010-10-05 Colin Watson <cjwatson@ubuntu.com> * util/grub-reboot.in: Make sure prev_saved_entry always gets a non-empty value.
108 lines
2.9 KiB
Bash
108 lines
2.9 KiB
Bash
#! /bin/sh
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#
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# Set a default boot entry for GRUB, for the next boot only.
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# Copyright (C) 2004,2009 Free Software Foundation, Inc.
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#
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# GRUB is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# GRUB is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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# Initialize some variables.
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transform="@program_transform_name@"
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prefix=@prefix@
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exec_prefix=@exec_prefix@
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bindir=@bindir@
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grub_editenv=${bindir}/`echo grub-editenv | sed ${transform}`
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rootdir=
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# Usage: usage
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# Print the usage.
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usage () {
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cat <<EOF
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Usage: $0 [OPTION] entry
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Set the default boot entry for GRUB, for the next boot only.
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-h, --help print this message and exit
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-v, --version print the version information and exit
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--root-directory=DIR expect GRUB images under the directory DIR
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instead of the root directory
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ENTRY is a number or a menu item title.
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Report bugs to <bug-grub@gnu.org>.
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EOF
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}
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# Check the arguments.
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for option in "$@"; do
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case "$option" in
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-h | --help)
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usage
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exit 0 ;;
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-v | --version)
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echo "grub-reboot (GNU GRUB ${PACKAGE_VERSION})"
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exit 0 ;;
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--root-directory=*)
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rootdir=`echo "$option" | sed 's/--root-directory=//'` ;;
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-*)
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echo "Unrecognized option \`$option'" 1>&2
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usage
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exit 1
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;;
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*)
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if test "x$entry" != x; then
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echo "More than one entry?" 1>&2
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usage
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exit 1
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fi
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entry="${option}" ;;
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esac
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done
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if test "x$entry" = x; then
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echo "entry not specified." 1>&2
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usage
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exit 1
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fi
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# Initialize these directories here, since ROOTDIR was initialized.
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case "$host_os" in
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netbsd* | openbsd*)
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# Because /boot is used for the boot block in NetBSD and OpenBSD, use /grub
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# instead of /boot/grub.
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grub_prefix=`echo /grub | sed ${transform}`
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bootdir=${rootdir}
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;;
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*)
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# Use /boot/grub by default.
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bootdir=${rootdir}/boot
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;;
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esac
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grubdir=${bootdir}/`echo grub | sed ${transform}`
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prev_saved_entry=`$grub_editenv ${grubdir}/grubenv list | sed -n 's/^saved_entry=//p'`
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if [ "$prev_saved_entry" ]; then
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$grub_editenv ${grubdir}/grubenv set prev_saved_entry="$prev_saved_entry"
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else
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# We need some non-empty value for prev_saved_entry so that GRUB will
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# recognise that grub-reboot has been used and restore the previous
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# saved entry. "0" is the same as an empty value, i.e. the first menu
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# entry.
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$grub_editenv ${grubdir}/grubenv set prev_saved_entry=0
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fi
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$grub_editenv ${grubdir}/grubenv set saved_entry="$entry"
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# Bye.
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exit 0
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