Re: Data Services: use cases

[zimoun]

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.


Cheers,
simon