1#!/bin/ksh
2#
3# $OpenBSD: reorder_kernel.sh,v 1.10 2021/09/13 11:49:21 robert Exp $
4#
5# Copyright (c) 2017 Robert Peichaer <rpe@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 -o errexit
20
21export PATH=/usr/bin:/bin:/usr/sbin:/sbin
22
23# Skip if /usr/share is on a nfs mounted filesystem.
24df -t nfs /usr/share >/dev/null 2>&1 && exit 1
25
26KERNEL=$(sysctl -n kern.osversion)
27KERNEL=${KERNEL%#*}
28KERNEL_DIR=/usr/share/relink/kernel
29LOGFILE=$KERNEL_DIR/$KERNEL/relink.log
30PROGNAME=${0##*/}
31SHA256=/var/db/kernel.SHA256
32
33# Create kernel compile dir and redirect stdout/stderr to a logfile.
34mkdir -m 700 -p $KERNEL_DIR/$KERNEL
35exec 1>$LOGFILE
36exec 2>&1
37
38# Install trap handlers to inform about success or failure via syslog.
39trap 'trap - EXIT; logger -st $PROGNAME \
40	"failed -- see $LOGFILE" >>/dev/console 2>&1' ERR
41trap 'logger -t $PROGNAME "kernel relinking done"' EXIT
42
43if [[ -f $KERNEL_DIR.tgz ]]; then
44	rm -rf $KERNEL_DIR/$KERNEL/*
45	# The directory containing the logfile was just deleted, redirect
46	# stdout again to a new logfile.
47	exec 1>$LOGFILE
48	tar -C $KERNEL_DIR -xzf $KERNEL_DIR.tgz $KERNEL
49	rm -f $KERNEL_DIR.tgz
50fi
51
52if ! sha256 -C $SHA256 /bsd; then
53	cat <<__EOF
54
55Failed to verify /bsd's checksum, therefore a randomly linked kernel (KARL)
56is not being built. KARL can be re-enabled for next boot by issuing as root:
57
58sha256 -h $SHA256 /bsd
59__EOF
60	# Trigger ERR trap
61	false
62fi
63
64cd $KERNEL_DIR/$KERNEL
65make newbsd
66[ -f /etc/bsd.re-config ] && config -e -c /etc/bsd.re-config -f bsd
67make newinstall
68sync
69
70echo "\nKernel has been relinked and is active on next reboot.\n"
71cat $SHA256
72