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Use variable and shorter logic for NFS check

No need to hardcode a parent path if we can reuse an existing variable for
the specific path that is in being used.

Negate the file system type in df(1) so the `|| exit 1' can be dropped
in favour of the errexit option, as is done for everything else in there.

Clarify the comment how this is intentionally NOT logged, i.e. the test
happens before the error trap/syslog/logfile handling.

OK millert

#!/bin/ksh
#
# $OpenBSD: reorder_kernel.sh,v 1.13 2022/11/07 15:55:56 kn Exp $
#
# Copyright (c) 2017 Robert Peichaer <rpe@openbsd.org>
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

set -o errexit

export PATH=/usr/bin:/bin:/usr/sbin:/sbin

KERNEL=$(sysctl -n kern.osversion)
KERNEL=${KERNEL%#*}
KERNEL_DIR=/usr/share/relink/kernel
LOGFILE=$KERNEL_DIR/$KERNEL/relink.log
PROGNAME=${0##*/}
SHA256=/var/db/kernel.SHA256

# Silently skip if on a NFS mounted filesystem.
df -t nonfs $KERNEL_DIR >/dev/null 2>&1

# Install trap handlers to inform about success or failure via syslog.
ERRMSG='failed'
trap 'trap - EXIT; logger -st $PROGNAME "$ERRMSG" >/dev/console 2>&1' ERR
trap 'logger -t $PROGNAME "kernel relinking done"' EXIT

# Create kernel compile dir and redirect stdout/stderr to a logfile.
mkdir -m 700 -p $KERNEL_DIR/$KERNEL
exec 1>$LOGFILE
exec 2>&1

ERRMSG="failed -- see $LOGFILE"

if [[ -f $KERNEL_DIR.tgz ]]; then
	rm -rf $KERNEL_DIR/$KERNEL/*
	# The directory containing the logfile was just deleted, redirect
	# stdout/stderr again to a new logfile.
	exec 1>$LOGFILE
	exec 2>&1
	tar -C $KERNEL_DIR -xzf $KERNEL_DIR.tgz $KERNEL
	rm -f $KERNEL_DIR.tgz
fi

if ! sha256 -C $SHA256 /bsd; then
	cat <<__EOF

Failed to verify /bsd's checksum, therefore a randomly linked kernel (KARL)
is not being built. KARL can be re-enabled for next boot by issuing as root:

sha256 -h $SHA256 /bsd
__EOF
	# Trigger ERR trap
	false
fi

cd $KERNEL_DIR/$KERNEL
make newbsd
[ -f /etc/bsd.re-config ] && config -e -c /etc/bsd.re-config -f bsd
make newinstall
sync

echo "\nKernel has been relinked and is active on next reboot.\n"
cat $SHA256