Date: Wed, 2 Dec 2015 17:36:52 +0000 From: Ed Maste <emaste@freebsd.org> To: "freebsd-arch@freebsd.org" <freebsd-arch@freebsd.org> Subject: Removing build metadata, for reproducible kernel builds Message-ID: <CAPyFy2AYeN9XNg=b0=JMWDC9ctWarfiZ-5zQorOPhguDJgxYpg@mail.gmail.com>
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The main issue currently preventing kernel builds from being reproducible[1] is the build metadata itself that's included (time, user, host, build path). In order to make the kernel build reproducible I plan to remove these by default, and add a src.conf knob to enable them for developers who want them in their own builds. The user-facing effect of this is that the kern.version sysctl no longer conveys this information, and uname -a changes from something like: FreeBSD ref11-amd64.freebsd.org 11.0-CURRENT FreeBSD 11.0-CURRENT #0 r288681: Mon Oct 5 01:40:11 UTC 2015 peter@build-11.freebsd.org:/usr/obj/usr/src/sys/CLUSTER11 amd64 to something like: FreeBSD feynman 10.2-STABLE FreeBSD 10.2-STABLE #44 r288174+7644546(stable-10) amd64 The current version of the change is available for review at https://reviews.freebsd.org/D4347. [1] See https://reproducible-builds.org/ for more information on the reproducible builds project.
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