Date: Wed, 2 Dec 2015 09:44:14 -0800 From: Alfred Perlstein <bright@mu.org> To: freebsd-arch@freebsd.org Subject: Re: Removing build metadata, for reproducible kernel builds Message-ID: <565F2DEE.9070204@mu.org> In-Reply-To: <CAPyFy2AYeN9XNg=b0=JMWDC9ctWarfiZ-5zQorOPhguDJgxYpg@mail.gmail.com> References: <CAPyFy2AYeN9XNg=b0=JMWDC9ctWarfiZ-5zQorOPhguDJgxYpg@mail.gmail.com>
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On 12/2/15 9:36 AM, Ed Maste wrote: > 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. Can it not be done as a kernel module (containing the strings/numbers) or injected after the fact by editing the binaries? This info is very useful. -Alfred
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