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From: Ed Maste <emaste@FreeBSD.org>
Date: Thu, 15 Dec 2016 12:57:03 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r310112 - head/sys/conf
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Author: emaste
Date: Thu Dec 15 12:57:03 2016
New Revision: 310112
URL: https://svnweb.freebsd.org/changeset/base/310112

Log:
  newvers.sh: add option to eliminate kernel build metadata
  
  Build metadata (username, hostname, etc.) prevents the FreeBSD kernel
  from building reproducibly. Add an option to disable inclusion of that
  metadata but retain the release information and SVN/git VCS details.
  See https://reproducible-builds.org/ for additional background.
  
  Reviewed by:	bapt
  Obtained from:	NetBSD
  MFC after:	1 month
  Sponsored by:	Reproducible Builds World Summit 2, Berlin
  Differential Revision:	https://reviews.freebsd.org/D4347

Modified:
  head/sys/conf/newvers.sh

Modified: head/sys/conf/newvers.sh
==============================================================================
--- head/sys/conf/newvers.sh	Thu Dec 15 10:51:35 2016	(r310111)
+++ head/sys/conf/newvers.sh	Thu Dec 15 12:57:03 2016	(r310112)
@@ -30,6 +30,14 @@
 #	@(#)newvers.sh	8.1 (Berkeley) 4/20/94
 # $FreeBSD$
 
+# Command line options:
+#
+#     -r               Reproducible build.  Do not embed directory names, user
+#                      names, time stamps or other dynamic information into
+#                      the outuput file.  This is intended to allow two builds
+#                      done at different times and even by different people on
+#                      different hosts to produce identical output.
+
 TYPE="FreeBSD"
 REVISION="12.0"
 BRANCH="CURRENT"
@@ -250,10 +258,28 @@ if [ -n "$hg_cmd" ] ; then
 	fi
 fi
 
+include_metadata=true
+while getopts r opt; do
+	case "$opt" in
+	r)
+		include_metadata=
+		;;
+	esac
+done
+shift $((OPTIND - 1))
+
+if [ -z "${include_metadata}" ]; then
+	VERINFO="${VERSION} ${svn}${git}${hg}${p4version}"
+	VERSTR="${VERINFO}\\n"
+else
+	VERINFO="${VERSION} #${v}${svn}${git}${hg}${p4version}: ${t}"
+	VERSTR="${VERINFO}\\n    ${u}@${h}:${d}\\n"
+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}:${d}\\n"
+#define SCCSSTR "@(#)${VERINFO}"
+#define VERSTR "${VERSTR}"
 #define RELSTR "${RELEASE}"
 
 char sccs[sizeof(SCCSSTR) > 128 ? sizeof(SCCSSTR) : 128] = SCCSSTR;