Re: [PATCH 2/8] packfile: refactor `prepare_packed_git_one()` to work on sources

> On Wed, Jul 09, 2025 at 09:54:50AM +0200, Patrick Steinhardt wrote:
> > In the preceding commit we have refactored how we load multi-pack
> > indices so that we take take the source as input for which we want to
> > load the MIDX. As part of this refactoring we started to store a pointer
> > to the MIDX in `struct odb_source` itself.
> 
> The first sentence here is a little confusing, but may read more clearly
> if written as:
> 
>     In the preceding commit we refactored how we load multi-pack
>     indices to take a corresponding "source" as input.

> > diff --git a/packfile.c b/packfile.c
> > index 16efc2fdca3..b43dd2fe6cb 100644
> > --- a/packfile.c
> > +++ b/packfile.c
> > @@ -935,22 +935,17 @@ static void prepare_pack(const char *full_name, size_t full_name_len,
> >  		report_garbage(PACKDIR_FILE_GARBAGE, full_name);
> >  }
> >
> > -static void prepare_packed_git_one(struct repository *r, char *objdir, int local)
> > +static void prepare_packed_git_one(struct odb_source *source, int local)
> >  {
> > -	struct prepare_pack_data data;
> >  	struct string_list garbage = STRING_LIST_INIT_DUP;
> > +	struct prepare_pack_data data = {
> > +		.m = source->multi_pack_index,
> > +		.r = source->odb->repo,
> > +		.garbage = &garbage,
> > +		.local = local,
> > +	};
> >
> > -	data.m = r->objects->multi_pack_index;
> > -
> > -	/* look for the multi-pack-index for this object directory */
> > -	while (data.m && strcmp(data.m->object_dir, objdir))
> > -		data.m = data.m->next;
> 
> Right, since we know that the MIDX corresponding to this source belongs
> to the same "object_dir" path. Having an ASSERT() here may make that
> more clear, but this change looks correct to me.
> 
> I am still a little unclear on how sources and ODBs correspond to one
> another, but under my working assumption from the previous patch, I
> think this is right.