Date: Sun, 14 Nov 2010 21:57:25 +0100 From: Erik Cederstrand <erik@cederstrand.dk> To: Dimitry Andric <dim@FreeBSD.org> Cc: Giorgos Keramidas <keramida@ceid.upatras.gr>, =?iso-8859-1?Q?Sp=F6rlein?= <uqs@spoerlein.net>, FreeBSD Hackers <hackers@freebsd.org> Subject: Re: Deterministic builds? Message-ID: <1B779A27-D8AD-4479-AC43-7F5557B720D4@cederstrand.dk> In-Reply-To: <4CE04750.8060802@FreeBSD.org> References: <718D8E86-EA2E-4D07-BAFF-5D8D093FD296@cederstrand.dk> <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>
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--Apple-Mail-2090-75917089 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Den 14/11/2010 kl. 21.32 skrev Dimitry Andric: > 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. In this case the timestamp + rev. is not sufficient to reproduce the = kernel 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. 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.g. filing a PR. If you need the timestamp, there's the mtime. Erik= --Apple-Mail-2090-75917089--
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