From owner-svn-src-head@freebsd.org  Thu Dec  3 12:17:10 2015
Return-Path: <owner-svn-src-head@freebsd.org>
Delivered-To: svn-src-head@mailman.ysv.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 by mailman.ysv.freebsd.org (Postfix) with ESMTP id 81F1DA40E03;
 Thu,  3 Dec 2015 12:17:10 +0000 (UTC)
 (envelope-from emaste@FreeBSD.org)
Received: from repo.freebsd.org (repo.freebsd.org
 [IPv6:2610:1c1:1:6068::e6a:0])
 (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
 (Client did not present a certificate)
 by mx1.freebsd.org (Postfix) with ESMTPS id 4A62918EB;
 Thu,  3 Dec 2015 12:17:10 +0000 (UTC)
 (envelope-from emaste@FreeBSD.org)
Received: from repo.freebsd.org ([127.0.1.37])
 by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id tB3CH9WK084554;
 Thu, 3 Dec 2015 12:17:09 GMT (envelope-from emaste@FreeBSD.org)
Received: (from emaste@localhost)
 by repo.freebsd.org (8.15.2/8.15.2/Submit) id tB3CH9m8084553;
 Thu, 3 Dec 2015 12:17:09 GMT (envelope-from emaste@FreeBSD.org)
Message-Id: <201512031217.tB3CH9m8084553@repo.freebsd.org>
X-Authentication-Warning: repo.freebsd.org: emaste set sender to
 emaste@FreeBSD.org using -f
From: Ed Maste <emaste@FreeBSD.org>
Date: Thu, 3 Dec 2015 12:17:09 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
 svn-src-head@freebsd.org
Subject: svn commit: r291691 - head/sys/conf
X-SVN-Group: head
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
X-BeenThere: svn-src-head@freebsd.org
X-Mailman-Version: 2.1.20
Precedence: list
List-Id: SVN commit messages for the src tree for head/-current
 <svn-src-head.freebsd.org>
List-Unsubscribe: <https://lists.freebsd.org/mailman/options/svn-src-head>,
 <mailto:svn-src-head-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/svn-src-head/>
List-Post: <mailto:svn-src-head@freebsd.org>
List-Help: <mailto:svn-src-head-request@freebsd.org?subject=help>
List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/svn-src-head>,
 <mailto:svn-src-head-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Thu, 03 Dec 2015 12:17:10 -0000

Author: emaste
Date: Thu Dec  3 12:17:09 2015
New Revision: 291691
URL: https://svnweb.freebsd.org/changeset/base/291691

Log:
  newvers: Honour SOURCE_DATE_EPOCH as a build reproducibility measure
  
  One reason the kernel does not build reproducibly is that it includes
  a timestamp in the version string. SOURCE_DATE_EPOCH provides a standard
  method to address this: it should be set to the last modification time
  of the source, and build processes use the specified timestamp instead
  of the "current" date and time.
  
  This change uses SOURCE_DATE_EPOCH if it is set; how it gets set needs
  to be addressed elsewhere.
  
  Reviewed by:	bapt
  MFC after:	1 week
  Sponsored by:	The FreeBSD Foundation

Modified:
  head/sys/conf/newvers.sh

Modified: head/sys/conf/newvers.sh
==============================================================================
--- head/sys/conf/newvers.sh	Thu Dec  3 11:45:12 2015	(r291690)
+++ head/sys/conf/newvers.sh	Thu Dec  3 12:17:09 2015	(r291691)
@@ -97,7 +97,15 @@ then
 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')