Re: [PATCH v5 4/4] branch: let --delete-integrated find branches merged onto changed files

> > +static int merge_keeps_upstream(const struct branch_change *change)
> > +{
> > +     mmfile_t base, upstream, branch;
> > +     mmfile_t result = { 0 };
> > +     int ret;
> > +
> > +     read_mmblob(&base, the_repository->objects, &change->base_oid);
> > +     read_mmblob(&upstream, the_repository->objects, &change->upstream_oid);
> > +     read_mmblob(&branch, the_repository->objects, &change->branch_oid);
> > +     ret = ll_merge(&result, change->path, &base, "base",
> > +                    &upstream, "upstream", &branch, "branch",
> > +                    the_repository->index, NULL) == LL_MERGE_OK &&
> > +           result.size == upstream.size &&
> > +           !memcmp(result.ptr, upstream.ptr, upstream.size);
> > +
> > +     free(base.ptr);
> > +     free(upstream.ptr);
> > +     free(branch.ptr);
> > +     free(result.ptr);
> > +     return ret;
> > +}
>
> The function calls ll_merge() and passes the istate associated with
> the_repository global, but have we read the index before the control
> reaches this point?  ll_merge() would want to consult custom low
> level merge from the attribute subsystem, and with istate that is
> not populated, it would fail to learn what the in-index attributes
> say, no?
>
> If there is a reason why we want to ignore the attributes, perhaps
> we should explicitly say so.