bug#56398: (guix git) fails to check out repos with nested submodules

["Ludovic Courtès" <ludovic.courtes@inria.fr>]

Hello,

André Batista <nandre@riseup.net> skribis:

> Well, I guess ENOENT != GIT_ENOTFOUND and, in that case, I think we
> are better off gracefully failing to update it than trying to "branch"
> our local repo. The patch below tests for the directory's existence
> before proceding with the update. With this patch applied I've managed
> to refresh pytorch, its submodules and got the following code:

But you got a wrong hash I presume, because submodule weren’t actually
checked out, right?

> +                (if (file-exists? directory)
> +                    ((lambda ()
> +                       (submodule-update submodule
> +                                         #:fetch-options fetch-options)

The problem is that it papers over an actual libgit2 bug.

I think we should instead report it upstream.  Do you feel like doing
it?  I guess we’d need to give them the C version of the three-line
snippet I gave earlier.

WDYT?

Thanks,
Ludo’.