From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mp2 ([2001:41d0:2:4a6f::]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) by ms11 with LMTPS id EAyuAywCs19TYwAA0tVLHw (envelope-from ) for ; Mon, 16 Nov 2020 22:50:20 +0000 Received: from aspmx1.migadu.com ([2001:41d0:2:4a6f::]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) by mp2 with LMTPS id EVE4OysCs1/MOQAAB5/wlQ (envelope-from ) for ; Mon, 16 Nov 2020 22:50:19 +0000 Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by aspmx1.migadu.com (Postfix) with ESMTPS id BC4A6940415 for ; Mon, 16 Nov 2020 22:50:19 +0000 (UTC) Received: from localhost ([::1]:55968 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kenKE-0006ku-P2 for larch@yhetil.org; Mon, 16 Nov 2020 17:50:18 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:44048) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kenFe-0001Ga-8c for guix-devel@gnu.org; Mon, 16 Nov 2020 17:45:34 -0500 Received: from mail-wr1-x432.google.com ([2a00:1450:4864:20::432]:45070) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1kenFc-0000c4-CV for guix-devel@gnu.org; Mon, 16 Nov 2020 17:45:33 -0500 Received: by mail-wr1-x432.google.com with SMTP id p1so20759082wrf.12 for ; Mon, 16 Nov 2020 14:45:31 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:in-reply-to:references:date:message-id :mime-version:content-transfer-encoding; bh=Imf9dbNhdIO2zQUVlL309xSnfIa5aXaBGpglo/rwADI=; b=eZcv2wbH9Pc69nDhHk/IhI6MypfppdY86/jxZzr021q5ax6IGeF1Dssi38TrhyCvB0 EFILyc1YXDg8MXWy2W5zvn029q4rsjFZimTaF4JPL7D5TAvWe1p0aIwonraGe5yK4xWO +MnTwDTAEwmucAgymtex6RB+4UyYHNHZylrccTW3sSUltY78am/6j790NefyGXU/sekz /iuT0QCqp5GN2laBmyNCsEke+ypc9ciUEK+JS0XOX1O6YAkh3mIhVAP9S59l4iyCB0Zu uU35mYLv93y+Q6lZXs8FpwzBKQvkdlMyoBvxmPtE6XK6CcpGKfQZKAyvpnuNx1fJ0kxn eS8w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:in-reply-to:references:date :message-id:mime-version:content-transfer-encoding; bh=Imf9dbNhdIO2zQUVlL309xSnfIa5aXaBGpglo/rwADI=; b=hE3ByiX2L/D3/R6Se8j9OeXfz2Ud6JJqYO6CvywgDociPzxHWyou3v6FCntZk7p0CK YqBKdmW4oPFNzQ7CoNw5O2gwcllqiEu91zcNh+rDCsF5tS8EirL+sphoKMtZHV/L8hIm Otc4KEAuFL983x1as1IkB8sHkOAUA9vbM9UVtFgKXclwqvCx2rsboHQdaBeWjbDvZrsW 1EVdv0SO1mB/fF0YmHGoSMUsk1bSRxWz2fSS/DxcgI2rVYsTWeIpTMLqDfBhU6DFLalW on0PeCdVmviGQH08RaFOqSqnnDhKBzEeOXM7WPIgiM/c7qhj9HQGRh6HWurSFRtDWvnn wMMA== X-Gm-Message-State: AOAM533U25xDdBr9DOYPlDItJxl1gnJ6NZ4xkD9rWDqiPUOq+JOWOj7b a5YzAocr5SbxOzUVfLuEhhaqrkmCrYLjow== X-Google-Smtp-Source: ABdhPJwREoLMENxmuuviPmrighD2m7wWtwUJYeXcWQfR/4f3NTN8X9RZQI7mJvxBrLMXhyXMTElxNw== X-Received: by 2002:adf:ee51:: with SMTP id w17mr21183663wro.373.1605566729019; Mon, 16 Nov 2020 14:45:29 -0800 (PST) Received: from lili ([2a01:e0a:59b:9120:65d2:2476:f637:db1e]) by smtp.gmail.com with ESMTPSA id h17sm18159419wrp.54.2020.11.16.14.45.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 16 Nov 2020 14:45:28 -0800 (PST) From: zimoun To: Christopher Baines Subject: Re: Data Services: use cases In-Reply-To: <875z65m0of.fsf@cbaines.net> References: <868scbvalo.fsf@gmail.com> <87d01m3475.fsf@ambrevar.xyz> <87a6wg7wto.fsf@gnu.org> <87k0ulm78x.fsf@cbaines.net> <86a6vhqcc3.fsf@gmail.com> <87blfxm39q.fsf@cbaines.net> <86v9e5ovjp.fsf@gmail.com> <875z65m0of.fsf@cbaines.net> Date: Mon, 16 Nov 2020 23:38:21 +0100 Message-ID: <86o8jxorky.fsf@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Received-SPF: pass client-ip=2a00:1450:4864:20::432; envelope-from=zimon.toutoune@gmail.com; helo=mail-wr1-x432.google.com X-detected-operating-system: by eggs.gnu.org: No matching host in p0f cache. That's all we know. X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: guix-devel@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: "Development of GNU Guix and the GNU System distribution." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Guix Devel Errors-To: guix-devel-bounces+larch=yhetil.org@gnu.org Sender: "Guix-devel" X-Scanner: ns3122888.ip-94-23-21.eu Authentication-Results: aspmx1.migadu.com; dkim=pass header.d=gmail.com header.s=20161025 header.b=eZcv2wbH; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (aspmx1.migadu.com: domain of guix-devel-bounces@gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=guix-devel-bounces@gnu.org X-Spam-Score: -1.71 X-TUID: Vna1B1C9aMPW On Mon, 16 Nov 2020 at 21:50, Christopher Baines wrote: >> The first commit producing j5llsz=E2=80=A6-ghc-haddock is not >> 3922208091 but 12dc9f58c4. And then compare: >> >> author date commit date >> 3922208091|Thu Jul 23 14:03:19 2020|Fri Jul 24 14:21:31 2020 >> 12dc9f58c4|Fri Jul 24 09:56:25 2020|Fri Jul 24 14:21:30 2020 >> >> I have not checked what guix-commits says. Maybe the mess is >> overthere. > > The author date and commit date won't necessarily match the date > whatever branch is updated (and it's when that branch was updated that > the Guix Data Service tries to store). Yes. > Generally, the author date will match or precede the commit date, which > will match or precede the date the commit hit whatever branch. Yes. > Taking 3922208091 as an example, I pulled the commit dates in UTC [1]: > > AuthorDate: Thu Jul 23 12:03:19 2020 > CommitDate: Fri Jul 24 12:21:31 2020 > Guix Data Service: 2020-07-24 12:22:11 [2] My point was: 3922208091 could not be the =E2=80=9Ccorrect=E2=80=9C and the= correct one could be 12dc9f58c4. By correct, read the one introducing the output j5llsz=E2=80=A6-ghc-haddock. And git show says: author date commit date 3922208091|Thu Jul 23 14:03:19 2020|Fri Jul 24 14:21:31 2020 12dc9f58c4|Fri Jul 24 09:56:25 2020|Fri Jul 24 14:21:30 2020 In the final Git tree history, the commit introducing j5llsz=E2=80=A6-ghc-haddock, i.e., changing from one row to another in the output-history page, is the commit 12dc9f58c4. Because of this 1 sec. difference. The question is what is the header email date? But=E2=80=A6 > 1: TZ=3DUTC git show --pretty=3Dfuller 3922208091 > 2: > https://data.guix.gnu.org/revision/39222080911eaf3d7f74effe4467c1a04464ae= f3 =E2=80=A6the revision 12dc9f58c4 is not available. See: http://data.guix.gnu.org/revision/12dc9f58c422c06bf9950f21c54ca3df1dc40af1 Maybe that the explanation. I do not know. > I think the author date says something about when the commit was > originally created. Rebasing and adding the Signed-off-by by bit will > update the commit date (but not the author date). Finally, the Guix > Data Exact. > Service will store when the branch was updated (it uses the date of the > email as a proxy for this). Now, after this discussion, I am not convinced anymore that the email header date is the right thing because we (user) do not have this information when debugging locally; only the Git checkout. Anyway. All is clear and I am ready to move on. :-) Thanks for all the explanations. Cheers, simon