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From:   Stefan Monnier <monnier@iro.umontreal.ca>
Subject: Re: [BUG] Destructive access to an "objects/info/alternates" repository
Date:   Mon, 04 Jan 2021 15:47:53 -0500
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Konstantin Ryabitsev [2021-01-04 08:54:10] wrote:
> I would guess that this is happening in builtin/gc.c#686 [1], where it calls
> clean_pack_garbage(). Running "git count-objects -v" shows:
>
> $ git count-objects -v
> warning: no corresponding .pack:
> /tmp/test/nongnu/.git/objects/pack/pack-0d85e74ac2f7e51ce26f281e64eb738e8182fa95.idx
> warning: no corresponding .pack:
> /tmp/test/nongnu/.git/objects/pack/pack-5fe14feff49ccdee5469af9dc94f6784e8464a6b.idx
> count: 0
> size: 0
> in-pack: 0
> packs: 0
> size-pack: 0
> prune-packable: 0
> garbage: 2
> size-garbage: 6573
> alternate: /tmp/test/nongnu/.git/objects

Ah, that'd make sense, yes.

> I agree with Stefan that this is undesired behaviour, even when it only
> happens when attempting to clean up garbage -- git-gc (and git-count-objects)
> should distinguish between garbage in the parent repository and its own
> repository and not attempt any modification of the parent repository during
> gc or any other operation.

Great, so IIUC:
- this is a harmless warning
- it's considered as a bug
- so my use case should work fine in practice and is not considered as
  "too weird to be supported"
Thank you,


        Stefan