xref: /openbsd-src/usr.sbin/syspatch/syspatch.sh (revision 0b27eea9d0d57a004a4ad2e219fb03875ec92335)
1#!/bin/ksh
2#
3# $OpenBSD: syspatch.sh,v 1.36 2016/11/04 14:18:45 ajacoutot Exp $
4#
5# Copyright (c) 2016 Antoine Jacoutot <ajacoutot@openbsd.org>
6#
7# Permission to use, copy, modify, and distribute this software for any
8# purpose with or without fee is hereby granted, provided that the above
9# copyright notice and this permission notice appear in all copies.
10#
11# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18
19set -e
20
21sp_err()
22{
23	echo "${@}" 1>&2 && return 1
24}
25
26usage()
27{
28	sp_err "usage: ${0##*/} [-c | -l | -r]"
29}
30
31needs_root()
32{
33	[[ $(id -u) -ne 0 ]] && sp_err "${0##*/}: need root privileges"
34}
35
36apply_patch()
37{
38	local _explodir _file _files _patch=$1
39	[[ -n ${_patch} ]]
40
41	local _explodir=${_TMP}/${_patch}
42	mkdir -p ${_explodir}
43
44	_files="$(tar xvzphf ${_TMP}/${_patch}.tgz -C ${_explodir})"
45	checkfs ${_files}
46
47	create_rollback ${_patch} "${_files}"
48
49	for _file in ${_files}; do
50		if [[ ${_file} == @(bsd|bsd.mp) ]]; then
51			if ! install_kernel ${_explodir}/${_file}; then
52				rollback_patch
53				sp_err "Failed to apply ${_patch} (/${_file})"
54			fi
55		else
56			if ! install_file ${_explodir}/${_file} /${_file}; then
57				rollback_patch
58				sp_err "Failed to apply ${_patch} (/${_file})"
59			fi
60		fi
61	done
62}
63
64apply_patches()
65{
66	needs_root
67	local _m _patch _patches="$(ls_missing)"
68
69	for _patch in ${_patches}; do
70		fetch_and_verify "${_patch}"
71		trap "" 2
72		apply_patch "${_patch}"
73		trap "rm -rf ${_TMP}; exit 1" 2
74	done
75
76	sp_cleanup
77}
78
79checkfs()
80{
81	local _files="${@}"
82	[[ -n ${_files} ]]
83
84	local _d _f
85
86	for _d in $(stat -qf "%Sd" $(for _f in ${_files}; do echo /${_f%/*}
87		done | uniq)); do mount | grep -q "^/dev/${_d} .* read-only" &&
88			sp_err "Remote or read-only filesystem, aborting"
89	done
90}
91
92create_rollback()
93{
94	local _file _patch=$1 _rbfiles
95	[[ -n ${_patch} ]]
96	shift
97	local _files="${@}"
98	[[ -n ${_files} ]]
99
100	[[ -d ${_PDIR}/${_REL} ]] || install -d ${_PDIR}/${_REL}
101
102	for _file in ${_files}; do
103		[[ -f /${_file} ]] || continue
104		_rbfiles="${_rbfiles} ${_file}"
105	done
106
107	if ! (cd / &&
108		# GENERIC.MP: substitute bsd.mp->bsd and bsd.sp->bsd
109		if ${_BSDMP} &&
110			tar -tzf ${_TMP}/${_patch}.tgz bsd >/dev/null 2>&1; then
111			tar -czf ${_PDIR}/${_REL}/rollback-${_patch}.tgz \
112				-s '/^bsd.mp$//' -s '/^bsd$/bsd.mp/' \
113				-s '/^bsd.sp$/bsd/' bsd.sp ${_rbfiles}
114		else
115			tar -czf ${_PDIR}/${_REL}/rollback-${_patch}.tgz \
116				${_rbfiles}
117		fi
118	); then
119		rm ${_PDIR}/${_REL}/rollback-${_patch}.tgz
120		sp_err "Failed to create rollback for ${_patch}"
121	fi
122}
123
124fetch_and_verify()
125{
126	# XXX privsep ala installer
127	local _patch=$1
128	[[ -n ${_patch} ]]
129
130	local _key="/etc/signify/openbsd-${_RELINT}-syspatch.pub" _p
131
132	${_FETCH} -o "${_TMP}/SHA256.sig" "${PATCH_PATH}/SHA256.sig"
133	${_FETCH} -mD "Applying" -o "${_TMP}/${_patch}.tgz" \
134		"${PATCH_PATH}/${_patch}.tgz"
135	(cd ${_TMP} &&
136		/usr/bin/signify -qC -p ${_key} -x SHA256.sig ${_patch}.tgz)
137}
138
139install_file()
140{
141	# XXX handle symlinks, dir->file, file->dir?
142	local _src=$1 _dst=$2
143	[[ -f ${_src} && -f ${_dst} ]]
144
145	local _fmode _fown _fgrp
146	eval $(stat -f "_fmode=%OMp%OLp _fown=%Su _fgrp=%Sg" ${_src})
147
148	install -DFS -m ${_fmode} -o ${_fown} -g ${_fgrp} ${_src} ${_dst}
149}
150
151install_kernel()
152{
153	local _bsd=/bsd _kern=$1
154	[[ -n ${_kern} ]]
155
156	# only save the original release kernel once
157	[[ -f /bsd.rollback${_RELINT} ]] ||
158		install -FSp /bsd /bsd.rollback${_RELINT}
159
160	if ${_BSDMP}; then
161		[[ ${_kern##*/} == bsd ]] && _bsd=/bsd.sp
162	fi
163
164	if [[ -n ${_bsd} ]]; then
165		install -FS ${_kern} ${_bsd}
166	fi
167}
168
169ls_installed()
170{
171	local _p
172	for _p in ${_PDIR}/${_REL}/*; do
173		_p=${_p:##*/}
174		[[ ${_p} = rollback-syspatch-${_RELINT}-*.tgz ]] &&
175			_p=${_p#rollback-} && echo ${_p%.tgz}
176	done | sort -V
177}
178
179ls_missing()
180{
181	# XXX match with installed sets (comp, x...)?
182	local _a _installed
183	_installed="$(ls_installed)"
184
185	${_FETCH} -o "${_TMP}/index.txt" "${PATCH_PATH}/index.txt"
186
187	for _a in $(sed 's/^.* //;s/^M//;s/.tgz$//' ${_TMP}/index.txt |
188		grep "^syspatch-${_RELINT}-.*$" | sort -V); do
189		if [[ -n ${_installed} ]]; then
190			echo ${_a} | grep -qw -- "${_installed}" || echo ${_a}
191		else
192			echo ${_a}
193		fi
194	done
195}
196
197rollback_patch()
198{
199	needs_root
200	local _explodir _file _files _patch
201
202	_patch="$(ls_installed | sort -V | tail -1)"
203	[[ -n ${_patch} ]]
204
205	echo "Reverting ${_patch}"
206	_explodir=${_TMP}/rollback-${_patch}
207	mkdir -p ${_explodir}
208
209	_files="$(tar xvzphf ${_PDIR}/${_REL}/rollback-${_patch}.tgz -C \
210		${_explodir})"
211	checkfs ${_files}
212
213	for _file in ${_files}; do
214		if [[ ${_file} == @(bsd|bsd.mp) ]]; then
215			install_kernel ${_explodir}/${_file} ||
216				sp_err "Failed to revert ${_patch} (/${_file})"
217		else
218			install_file ${_explodir}/${_file} /${_file} ||
219				sp_err "Failed to revert ${_patch} (/${_file})"
220		fi
221	done
222
223	rm ${_PDIR}/${_REL}/rollback-${_patch}.tgz \
224		${_PDIR}/${_REL}/${_patch#syspatch-${_RELINT}-}.patch.sig
225
226	sp_cleanup
227}
228
229sp_cleanup()
230{
231	local _d _k _m
232
233	# remove non matching release /var/syspatch/ content
234	for _d in ${_PDIR}/*; do
235		[[ -e ${_d} ]] || continue
236		[[ ${_d:##*/} == ${_REL} ]] || rm -r ${_d}
237	done
238
239	# remove non matching release rollback kernel
240	for _k in /bsd.rollback*; do
241		[[ -f ${_k} ]] || continue
242		[[ ${_k} == /bsd.rollback${_RELINT} ]] || rm ${_k}
243	done
244
245	# remove rollback kernel if all kernel syspatches have been reverted
246	cmp -s /bsd /bsd.rollback${_RELINT} && rm /bsd.rollback${_RELINT}
247
248	# non-fatal: the syspatch|rollback tarball should have correct perms
249	for _m in 4.4BSD BSD.x11; do
250		mtree -qdef /etc/mtree/${_m}.dist -p / -U >/dev/null || true
251	done
252}
253
254# only run on release (not -current nor -stable)
255set -A _KERNV -- $(sysctl -n kern.version |
256	sed 's/^OpenBSD \([0-9]\.[0-9]\)\([^ ]*\).*/\1 \2/;q')
257[[ -z ${_KERNV[1]} ]]
258
259# check args
260[[ $@ == @(|-[[:alpha:]]) ]] || usage
261
262# XXX to be discussed; check for $ARCH?
263[[ -n ${PATCH_PATH} ]]
264[[ -d ${PATCH_PATH} ]] && PATCH_PATH="file://$(readlink -f ${PATCH_PATH})"
265[[ ${PATCH_PATH:%%://*} == @(file|ftp|http|https) ]]
266
267[[ $(sysctl -n hw.ncpufound) -gt 1 ]] && _BSDMP=true || _BSDMP=false
268_FETCH="/usr/bin/ftp -MVk ${FTP_KEEPALIVE-0}"
269_PDIR="/var/syspatch"
270_REL=${_KERNV[0]}
271_RELINT=${_REL%\.*}${_REL#*\.}
272_TMP=$(mktemp -d -p /tmp syspatch.XXXXXXXXXX)
273readonly _BSDMP _FETCH _PDIR _REL _RELINT _TMP
274[[ -n ${_REL} && -n ${_RELINT} ]]
275
276trap "rm -rf ${_TMP}; exit 1" 2 3 9 13 15 ERR
277
278while getopts clr arg; do
279	case ${arg} in
280		c) ls_missing;;
281		l) ls_installed;;
282		r) rollback_patch;;
283		*) usage;;
284	esac
285done
286shift $(( OPTIND -1 ))
287[[ $# -ne 0 ]] && usage
288
289[[ ${OPTIND} != 1 ]] || apply_patches
290
291rm -rf ${_TMP}
292