bug#65720: [bug#66650] [PATCH] git: Shell out to ‘git gc’ when necessary.

[Christopher Baines <mail@cbaines.net>]

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Ludovic Courtès <ludo@gnu.org> writes:

> Fixes <https://issues.guix.gnu.org/65720>.
>
> This fixes a bug whereby libgit2-managed checkouts would keep growing as
> we fetch.
>
> * guix/git.scm (packs-in-git-repository, maybe-run-git-gc): New
> procedures.
> (update-cached-checkout): Use it.
> ---
>  guix/git.scm | 39 ++++++++++++++++++++++++++++++++++++---
>  1 file changed, 36 insertions(+), 3 deletions(-)
>
> Hi!
>
> This is a radical fix/workaround for the unbounded Git checkout growth
> problem, shelling out to ‘git gc’ when it’s likely needed (“too many”
> pack files around).
>
> I thought we might be able to implement a ‘git gc’ approximation using
> the libgit2 “packbuilder” interface, but I haven’t got around to doing
> it: <https://libgit2.org/libgit2/#HEAD/search/pack>.
>
> Once again, shelling out is not my favorite option, but it’s a bug we
> should fix sooner rather than later, hence this compromise.
>
> Thoughts?

This sounds good to me, the data service has this problem as well of
cached checkouts that grow to be too large and this sounds like it'll
address it.

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