Re: Data Services: use cases

[Christopher Baines <mail@cbaines.net>]

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zimoun <zimon.toutoune@gmail.com> writes:

> Hi Chris,
>
> On Mon, 16 Nov 2020 at 19:28, Christopher Baines <mail@cbaines.net> wrote:
>
>>> I recently have a very similar issue [1].  And based on my
>>> investigations [2], the issue seems "commit date vs author date";
>>> especially when merges are floating around.  Because of that, from
>>> "From" to "To" is not always accurate.  Chris, could you confirm?
>>>
>>> 1: <https://lists.gnu.org/archive/html/guix-devel/2020-10/msg00084.html>
>>> 2: <https://lists.gnu.org/archive/html/guix-devel/2020-10/msg00096.html>
>>
>> The Guix Data Service stores the date in the email from the Git hook
>> that runs when one pushes to Savannah. That's the date you see for a
>> revision, and it should be pretty close to when it actually showed up in
>> the Git repository. It's not perfectly accurate, but it should be better
>> than either the commit date or author date from the Git metadata.
>
> Re-reading [2] above, I am confused.  Because the Data Service seems to
> show the author date rather than the commit date or the header email
> date.
>
> The email database from where the Data Service is fetching is
> guix-commits, right?
>
> If yes, there is different dates that are appearing; for instance the
> first I find: commit 5627bfe45ce46f498979b4ad2deab1fdfed22b6c authored
> by Jason Conroy and pushed by mothacehe:
>
> --8<---------------cut here---------------start------------->8---
> From MAILER-DAEMON Thu Oct 01 03:28:02 2020
> Date: Thu, 01 Oct 2020 03:27:57 -0400
> X-List-Received-Date: Thu, 01 Oct 2020 07:28:00 -0000
> --
> AuthorDate: Sun Sep 27 13:16:39 2020 -0400
> --8<---------------cut here---------------end--------------->8---
>
> Message-ID: <20201001072757.23203.96292@vcs0.savannah.gnu.org>
>
>
> And from my Git checkout: CommitDate: Thu Oct 1 09:27:33 2020 +0200.
>
> (Modulo some timezone conversion, I guess.)
>
>
> Maybe my investigations in [2] above are wrong but which date from the
> email the Data Service is using?
>
>
> I agree the most accurate is the date from the email header of
> guix-commits.

So the date given by data.guix.gnu.org for this revision is:
2020-10-01 07:27:57 [1]

1: https://data.guix.gnu.org/revision/5627bfe45ce46f498979b4ad2deab1fdfed22b6c

Unfortunately, it's not explicit about the timezone, but it's UTC. This
matches the date in the email, as you include it above:

It's just expressed in a different timezone.

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