Date: Sun, 14 Nov 2010 22:13:34 +0100 From: =?utf-8?B?U3DDtnJsZWlu?= <uqs@spoerlein.net> To: Erik Cederstrand <erik@cederstrand.dk> Cc: Giorgos Keramidas <keramida@ceid.upatras.gr>, FreeBSD Hackers <hackers@freebsd.org>, Dimitry Andric <dim@freebsd.org> Subject: Re: Deterministic builds? Message-ID: <20101114211334.GG64243@acme.spoerlein.net> In-Reply-To: <1B779A27-D8AD-4479-AC43-7F5557B720D4@cederstrand.dk> References: <20101011084733.GM2392@deviant.kiev.zoral.com.ua> <95F3B27C-42E6-4267-9965-AC3219310C35@cederstrand.dk> <20101021175748.GD19295@acme.spoerlein.net> <C297DE8F-0842-41C2-A930-A15AA0F3B3BB@cederstrand.dk> <20101022100134.GL19295@acme.spoerlein.net> <8B6E3E35-68AF-42ED-98CF-E2A4448DAA11@cederstrand.dk> <xeia1v6q2t1h.fsf@kobe.laptop> <0CF7C325-E7D9-4C51-8E60-9A0243D2FFFE@cederstrand.dk> <4CE04750.8060802@FreeBSD.org> <1B779A27-D8AD-4479-AC43-7F5557B720D4@cederstrand.dk>
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--ew6BAiZeqk4r7MaW Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Sun, 14.11.2010 at 21:57:25 +0100, Erik Cederstrand wrote: >=20 > Den 14/11/2010 kl. 21.32 skrev Dimitry Andric: >=20 > > On 2010-11-14 21:22, Erik Cederstrand wrote: > >> I'm curious as to why this might be useful? Would the mtime of the > >> file not be be sufficient? I can only think of debugging purposes, but > >> apart from the timestamp, two kernels with the same rev. would be > >> bitwise identical, > >=20 > > This does not have to be the case. For example, if you have have local > > modifications, or use different settings in make.conf or src.conf. >=20 > In this case the timestamp + rev. is not sufficient to reproduce the kern= el anyway. You'd need to store externally the non-standard contents of conf= files, local diffs etc. on all your non-standard builds. You could do all = sorts of fun stuff, even fool the rev. number or timestamp if you wanted. >=20 > I'm just saying that for the standard user on a standard GENERIC kernel (= and world for that matter) - the revision number should be sufficient for e= =2Eg. filing a PR. If you need the timestamp, there's the mtime. It might not be very easy, going from revision to timestamp. It is still very useful to know the rough timeframe when a kernel was built, as that might give you the "age" of the source tree. This is of course not a very good mapping, and the reason we have both the revision number in there, but also something a human understands. If this timestamp must be fixed, my vote would be on using the timestamp of the svn revision the build was using as a source. But it should be made clear, that this is then no longer the built timestamp, but the source repo timestamp. 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