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bug#62656: broken guix time-machine + software-heritage
From: |
Ludovic Courtès |
Subject: |
bug#62656: broken guix time-machine + software-heritage |
Date: |
Thu, 04 May 2023 09:22:23 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/28.2 (gnu/linux) |
Hi,
Simon Tournier <zimon.toutoune@gmail.com> skribis:
> On Tue, 02 May 2023 at 09:42, Ludovic Courtès <ludovic.courtes@inria.fr>
> wrote:
>
>>> Somehow, we could tweak ’clone-from-swh’ from (guix git) to use 'flat
>>> instead of 'git-bare. However, I am unsure the other tweaks it would
>>> require since a Git repository is somehow expected.
>>
>> Yeah, ‘clone-from-swh’ is really cloning, so it needs ‘git-bare’.
>> Generally, in the case of channels, we need a full clone, not just a
>> revision. Various bits of the machinery expect the clone: (guix
>> describe), (guix channels), and so on.
>
> Even if the bug on SWH would be fixed, at the rate the Guix repo is
> growing, it would be impractical to cook the whole Guix repo.
Falling back to SWH to fetch channels is something we expect to be rare,
though.
> And it appears to me weird when we, most of the time, need a very
> restricted set of commits.
>
> We could imagine to locally create a new repo (git init) and only add
> the content of the commit specified by “guix time-machine”.
To do that we’d need to say goodbye to the features I mentioned above.
> PS: Just some numbers backing the rate of growing:
>
> $ git log --oneline | wc -l
> 114457
>
> $ git log --oneline --before=2019-05-01 | wc -l
> 43845
>
> $ git log --oneline --after=2019-05-01 | wc -l
> 70612
>
>
> 1. We are cooking 43845 commits of the history that are useless because
> unreachable with the time-machine. They pre-date the introduction
> of the inferiors – yes, we could refine and consider v0.15 instead
> of v1.0.0. :-)
>
> 2. The first commit is from 2012. Over the first 7 years, 38% of the
> history had been produced. In less than 4 years, we have produced
> 62% of the history! Yeah, that’s cool!
>
> Basically, from now to less than 5 years, we will generate the same
> number of commits as over the past 10 years.
Heh, insightful figures!
Ludo’.