Re: [PATCH 05/13] upload-pack: convert to use `reference_get_peeled_oid()`

> Patrick Steinhardt <ps@pks.im> writes:
> 
> > The `write_v0_ref()` callback is invoked from two callsites:
> >
> 
> Okay so this function does multiple things based on whether the
> capabilities are already advertised or not.
> 
> - If not, we propagate the capabilities and set the static variable
>   `capabilities` to NULL and also set `data->sent_capabilities = 1;`.
>   - We receive `ref->oid` as a zero oid for the hash algorithm being
>     used, we convert it to the hex format with `oid_to_hex()`.
> - If already advertised, we simply propagate the reference and if it can
>   be peeled, also propagate the peeled reference.
> 
> Not for your series: but this feels like the capabilities should be an
> independent function.