freebsd-skq/sys/boot/common/newvers.sh
ngie 286d8e974c Make vers.c creation atomic by using a temporary file, then moving
the temporary file to vers.c at the end of the script

The previous logic wrote out to vers.c multiple times, so the file
could be incorrectly interpreted as being completely written out
after one of the echo calls with recursive make, when in reality it
was only partially written.

Also, in the event the build was interrupted when creating vers.c
(small race window), it would have a leftover file that needed to
be cleaned up before resuming the build.

MFC after: 3 weeks
Sponsored by: EMC / Isilon Storage Division
2015-10-24 21:59:58 +00:00

48 lines
2.2 KiB
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Executable File

#!/bin/sh -
#
# $FreeBSD$
# $NetBSD: newvers.sh,v 1.1 1997/07/26 01:50:38 thorpej Exp $
#
# Copyright (c) 1984, 1986, 1990, 1993
# The Regents of the University of California. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# 4. Neither the name of the University nor the names of its contributors
# may be used to endorse or promote products derived from this software
# without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# @(#)newvers.sh 8.1 (Berkeley) 4/20/94
tempfile=$(mktemp tmp.XXXXXX) || exit
trap "rm -f $tempfile" EXIT INT TERM
LC_ALL=C; export LC_ALL
u=${USER-root} h=${HOSTNAME-`hostname`} t=`date`
#r=`head -n 6 $1 | tail -n 1 | awk -F: ' { print $1 } '`
r=`awk -F: ' /^[0-9]\.[0-9]+:/ { print $1; exit }' $1`
echo "char bootprog_name[] = \"FreeBSD/${3} ${2}\";" > $tempfile
echo "char bootprog_rev[] = \"${r}\";" >> $tempfile
echo "char bootprog_date[] = \"${t}\";" >> $tempfile
echo "char bootprog_maker[] = \"${u}@${h}\";" >> $tempfile
mv $tempfile vers.c