nextboot.sh revision 297772 
1#! /bin/sh
2#
3# Copyright (c) 2002 Gordon Tetlow. All rights reserved.
4# Copyright (c) 2012 Sandvine Incorporated. All rights reserved.
5#
6# Redistribution and use in source and binary forms, with or without
7# modification, are permitted provided that the following conditions
8# are met:
9# 1. Redistributions of source code must retain the above copyright
10#    notice, this list of conditions and the following disclaimer.
11# 2. Redistributions in binary form must reproduce the above copyright
12#    notice, this list of conditions and the following disclaimer in the
13#    documentation and/or other materials provided with the distribution.
14#
15# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25# SUCH DAMAGE.
26#
27# $FreeBSD: head/sbin/reboot/nextboot.sh 297772 2016-04-10 01:25:12Z markj $
28
29append="NO"
30delete="NO"
31kenv=
32force="NO"
33nextboot_file="/boot/nextboot.conf"
34
35add_kenv()
36{
37	local var value
38
39	var=$1
40	# strip literal quotes if passed in
41	value=${2%\"*}
42	value=${value#*\"}
43
44	if [ -n "${kenv}" ]; then
45		kenv="${kenv}
46"
47	fi
48	kenv="${kenv}${var}=\"${value}\""
49}
50
51display_usage() {
52	cat <<-EOF
53	Usage: nextboot [-e variable=value] [-f] [-k kernel] [-o options]
54	       nextboot -D
55	EOF
56}
57
58while getopts "aDe:fk:o:" argument ; do
59	case "${argument}" in
60	a)
61		append="YES"
62		;;
63	D)
64		delete="YES"
65		;;
66	e)
67		var=${OPTARG%%=*}
68		value=${OPTARG#*=}
69		if [ -z "$var" -o -z "$value" ]; then
70			display_usage
71			exit 1
72		fi
73		add_kenv "$var" "$value"
74		;;
75	f)
76		force="YES"
77		;;
78	k)
79		kernel="${OPTARG}"
80		add_kenv kernel "$kernel"
81		;;
82	o)
83		add_kenv kernel_options "${OPTARG}"
84		;;
85	*)
86		display_usage
87		exit 1
88		;;
89	esac
90done
91
92if [ ${delete} = "YES" ]; then
93	rm -f ${nextboot_file}
94	exit 0
95fi
96
97if [ -z "${kenv}" ]; then
98	display_usage
99	exit 1
100fi
101
102if [ -n "${kernel}" -a ${force} = "NO" -a ! -d /boot/${kernel} ]; then
103	echo "Error: /boot/${kernel} doesn't exist. Use -f to override."
104	exit 1
105fi
106
107df -Tn "/boot/" 2>/dev/null | while read _fs _type _other ; do
108	[ "zfs" = "${_type}" ] || continue
109	cat 1>&2 <<-EOF
110		WARNING: loader(8) has only R/O support for ZFS
111		nextboot.conf will NOT be reset in case of kernel boot failure
112	EOF
113done
114
115set -e
116
117nextboot_tmp=$(mktemp $(dirname ${nextboot_file})/nextboot.XXXXXX)
118
119if [ ${append} = "YES" -a -f ${nextboot_file} ]; then
120	cp -f ${nextboot_file} ${nextboot_tmp}
121fi
122
123cat >> ${nextboot_tmp} << EOF
124nextboot_enable="YES"
125$kenv
126EOF
127
128fsync ${nextboot_tmp}
129
130mv ${nextboot_tmp} ${nextboot_file}
131