Re: [PATCH 6/6] send-pack: support push negotiation

[Jonathan Tan <jonathantanmy@google.com>]

[snip asking about whether extra_have (a.k.a. advertised) and commons (a.k.a.
negotiated) can be merged]

> Here, it would be nice if extra_have and commons were merged before calling
> pack_objects(). I mentioned a way to perhaps make that easier above, but
> the context might not make that be super-simple. Running a loop here to
> scan 'commons' and append them to 'extra_have' might be a sufficient
> approach.
> 
> Generally, this approach seems like it would work. I have not done any
> local testing, yet.
> 
> Thanks,
> -Stolee

I was reluctant to merge them because that would involve either (1)
adding commons to "extra_have" (as you suggest) or (2) iterating through
"extra_have" in order to add it to the "commons" set. For (1), this
would modify "extra_have", which is passed in from the outside. Looking
at its callers, the main one in git_transport_push() in transport.c
calls send_pack() with a set that has traversed the transport API, so I
think it would be confusing if such a set suddenly changed. For (2), the
extra loop seems more troublesome than having two parameters with
clearer names indicating where they come from. I don't mind changing to
(2), though, if people want it.