#76660 - Downgrade prevention triggers erroneously with 'guix pull'

Package	Source(s)		Maintainer(s)
guix		PTS Buildd Popcon

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From: Tomas Volf <~@wolfsden.cz>
To: Simon Tournier <zimon.toutoune@gmail.com>
Subject: Re: bug#76660: current guix pull doesn't authenticate
In-Reply-To: <87msdalhl3.fsf@gmail.com> (Simon Tournier's message of "Mon, 24
 Mar 2025 13:48:56 +0100")
References: <alpine.DEB.2.21.2503011134420.24671@marsh.hcoop.net>
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Date: Tue, 25 Mar 2025 22:01:02 +0100
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Cc: Ludovic Courtès <ludo@gnu.org>,
 Jack Hill <jackhill@jackhill.us>, 76660@debbugs.gnu.org,
 Leo Famulari <leo@famulari.name>
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[Message part 1 (text/plain, inline)]

Simon Tournier <zimon.toutoune@gmail.com> writes:

> Hi Ludo,
>
> On Mon, 10 Mar 2025 at 22:57, Ludovic Courtès <ludo@gnu.org> wrote:
>> Simon Tournier <zimon.toutoune@gmail.com> skribis:
>>
>>> Last cherry on the top, from [1], the implementation relying on “git
>>> merge-base --is-ancestor” is 35x faster.
>>
>> Uh, interesting!  I would still like to avoid shelling out to Git for
>> common operations, but this comparison shows there’s a lot of room to
>> improve the performance of the current implementation.
>
> You mean the current implementation of ligbit2, right?  Because, from my
> poor understanding, it’s part of the performance barrier.

There is git_graph_descendant_of function in libgit2, but it is not
exposed by the guile-git binding.  Maybe we could try to use it to
implement the check instead the current approach (which does it in
Guile).  I wonder how well that would perform compared to --is-ancestor.

Tomas

-- 
There are only two hard things in Computer Science:
cache invalidation, naming things and off-by-one errors.

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#76660 Downgrade prevention triggers erroneously with 'guix pull'