Index: head/sys/conf/newvers.sh
===================================================================
--- head/sys/conf/newvers.sh	(revision 291690)
+++ head/sys/conf/newvers.sh	(revision 291691)
@@ -1,234 +1,242 @@
 #!/bin/sh -
 #
 # 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
 # $FreeBSD$
 
 TYPE="FreeBSD"
 REVISION="11.0"
 BRANCH="CURRENT"
 if [ -n "${BRANCH_OVERRIDE}" ]; then
 	BRANCH=${BRANCH_OVERRIDE}
 fi
 RELEASE="${REVISION}-${BRANCH}"
 VERSION="${TYPE} ${RELEASE}"
 
 if [ -z "${SYSDIR}" ]; then
     SYSDIR=$(dirname $0)/..
 fi
 
 if [ -n "${PARAMFILE}" ]; then
 	RELDATE=$(awk '/__FreeBSD_version.*propagated to newvers/ {print $3}' \
 		${PARAMFILE})
 else
 	RELDATE=$(awk '/__FreeBSD_version.*propagated to newvers/ {print $3}' \
 		${SYSDIR}/sys/param.h)
 fi
 
 b=share/examples/etc/bsd-style-copyright
 if [ -r "${SYSDIR}/../COPYRIGHT" ]; then
 	year=$(sed -Ee '/^Copyright .* The FreeBSD Project/!d;s/^.*1992-([0-9]*) .*$/\1/g' ${SYSDIR}/../COPYRIGHT)
 else
 	year=$(date +%Y)
 fi
 # look for copyright template
 for bsd_copyright in ../$b ../../$b ../../../$b /usr/src/$b /usr/$b
 do
 	if [ -r "$bsd_copyright" ]; then
 		COPYRIGHT=`sed \
 		    -e "s/\[year\]/1992-$year/" \
 		    -e 's/\[your name here\]\.* /The FreeBSD Project./' \
 		    -e 's/\[your name\]\.*/The FreeBSD Project./' \
 		    -e '/\[id for your version control system, if any\]/d' \
 		    $bsd_copyright` 
 		break
 	fi
 done
 
 # no copyright found, use a dummy
 if [ -z "$COPYRIGHT" ]; then
 	COPYRIGHT="/*-
  * Copyright (c) 1992-$year The FreeBSD Project.
  * All rights reserved.
  *
  */"
 fi
 
 # add newline
 COPYRIGHT="$COPYRIGHT
 "
 
 # VARS_ONLY means no files should be generated, this is just being
 # included.
 if [ -n "$VARS_ONLY" ]; then
 	return 0
 fi
 
 LC_ALL=C; export LC_ALL
 if [ ! -r version ]
 then
 	echo 0 > version
 fi
 
 touch version
-v=`cat version` u=${USER:-root} d=`pwd` h=${HOSTNAME:-`hostname`} t=`date`
+v=`cat version` u=${USER:-root} d=`pwd` h=${HOSTNAME:-`hostname`}
+if [ -n "$SOURCE_DATE_EPOCH" ]; then
+	if ! t=`date -r $SOURCE_DATE_EPOCH 2>/dev/null`; then
+		echo "Invalid SOURCE_DATE_EPOCH" >&2
+		exit 1
+	fi
+else
+	t=`date`
+fi
 i=`${MAKE:-make} -V KERN_IDENT`
 compiler_v=$($(${MAKE:-make} -V CC) -v 2>&1 | grep -w 'version')
 
 for dir in /usr/bin /usr/local/bin; do
 	if [ ! -z "${svnversion}" ] ; then
 		break
 	fi
 	if [ -x "${dir}/svnversion" ] && [ -z ${svnversion} ] ; then
 		# Run svnversion from ${dir} on this script; if return code
 		# is not zero, the checkout might not be compatible with the
 		# svnversion being used.
 		${dir}/svnversion $(realpath ${0}) >/dev/null 2>&1
 		if [ $? -eq 0 ]; then
 			svnversion=${dir}/svnversion
 			break
 		fi
 	fi
 done
 
 if [ -z "${svnversion}" ] && [ -x /usr/bin/svnliteversion ] ; then
 	/usr/bin/svnliteversion $(realpath ${0}) >/dev/null 2>&1
 	if [ $? -eq 0 ]; then
 		svnversion=/usr/bin/svnliteversion
 	else
 		svnversion=
 	fi
 fi
 
 for dir in /usr/bin /usr/local/bin; do
 	if [ -x "${dir}/p4" ] && [ -z ${p4_cmd} ] ; then
 		p4_cmd=${dir}/p4
 	fi
 done
 if [ -d "${SYSDIR}/../.git" ] ; then
 	for dir in /usr/bin /usr/local/bin; do
 		if [ -x "${dir}/git" ] ; then
 			git_cmd="${dir}/git --git-dir=${SYSDIR}/../.git"
 			break
 		fi
 	done
 fi
 
 if [ -d "${SYSDIR}/../.hg" ] ; then
 	for dir in /usr/bin /usr/local/bin; do
 		if [ -x "${dir}/hg" ] ; then
 			hg_cmd="${dir}/hg -R ${SYSDIR}/.."
 			break
 		fi
 	done
 fi
 
 if [ -n "$svnversion" ] ; then
 	svn=`cd ${SYSDIR} && $svnversion 2>/dev/null`
 	case "$svn" in
 	[0-9]*)	svn=" r${svn}" ;;
 	*)	unset svn ;;
 	esac
 fi
 
 if [ -n "$git_cmd" ] ; then
 	git=`$git_cmd rev-parse --verify --short HEAD 2>/dev/null`
 	svn=`$git_cmd svn find-rev $git 2>/dev/null`
 	if [ -n "$svn" ] ; then
 		svn=" r${svn}"
 		git="=${git}"
 	else
 		svn=`$git_cmd log | fgrep 'git-svn-id:' | head -1 | \
 		     sed -n 's/^.*@\([0-9][0-9]*\).*$/\1/p'`
 		if [ -z "$svn" ] ; then
 			svn=`$git_cmd log --format='format:%N' | \
 			     grep '^svn ' | head -1 | \
 			     sed -n 's/^.*revision=\([0-9][0-9]*\).*$/\1/p'`
 		fi
 		if [ -n "$svn" ] ; then
 			svn=" r${svn}"
 			git="+${git}"
 		else
 			git=" ${git}"
 		fi
 	fi
 	git_b=`$git_cmd rev-parse --abbrev-ref HEAD`
 	if [ -n "$git_b" ] ; then
 		git="${git}(${git_b})"
 	fi
 	if $git_cmd --work-tree=${SYSDIR}/.. diff-index \
 	    --name-only HEAD | read dummy; then
 		git="${git}-dirty"
 	fi
 fi
 
 if [ -n "$p4_cmd" ] ; then
 	p4version=`cd ${SYSDIR} && $p4_cmd changes -m1 "./...#have" 2>&1 | \
 		awk '{ print $2 }'`
 	case "$p4version" in
 	[0-9]*)
 		p4version=" ${p4version}"
 		p4opened=`cd ${SYSDIR} && $p4_cmd opened ./... 2>&1`
 		case "$p4opened" in
 		File*) ;;
 		//*)	p4version="${p4version}+edit" ;;
 		esac
 		;;
 	*)	unset p4version ;;
 	esac
 fi
 
 if [ -n "$hg_cmd" ] ; then
 	hg=`$hg_cmd id 2>/dev/null`
 	svn=`$hg_cmd svn info 2>/dev/null | \
 		awk -F': ' '/Revision/ { print $2 }'`
 	if [ -n "$svn" ] ; then
 		svn=" r${svn}"
 	fi
 	if [ -n "$hg" ] ; then
 		hg=" ${hg}"
 	fi
 fi
 
 cat << EOF > vers.c
 $COPYRIGHT
 #define SCCSSTR "@(#)${VERSION} #${v}${svn}${git}${hg}${p4version}: ${t}"
 #define VERSTR "${VERSION} #${v}${svn}${git}${hg}${p4version}: ${t}\\n    ${u}@${h}:${d}\\n"
 #define RELSTR "${RELEASE}"
 
 char sccs[sizeof(SCCSSTR) > 128 ? sizeof(SCCSSTR) : 128] = SCCSSTR;
 char version[sizeof(VERSTR) > 256 ? sizeof(VERSTR) : 256] = VERSTR;
 char compiler_version[] = "${compiler_v}";
 char ostype[] = "${TYPE}";
 char osrelease[sizeof(RELSTR) > 32 ? sizeof(RELSTR) : 32] = RELSTR;
 int osreldate = ${RELDATE};
 char kern_ident[] = "${i}";
 EOF
 
 echo $((v + 1)) > version