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')
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