Re: [PATCH v2 3/3] transport.c: introduce core.alternateRefsPrefixes

[Junio C Hamano <gitster@pobox.com>]

Jeff King <peff@peff.net> writes:

> I was suggesting that check_everything_connected() is not strictly
> transport-related, so would be inappropriate for transport.*, and we'd
> need a more generic name. And my "either way" was that I could see
> an argument that it _is_ transport related, since we only call it now
> when receiving a pack. But that doesn't have to be the case, and
> certainly implementing it with "rev-list --alternate-refs" muddies that
> considerably.

Even after 7043c707 ("check_everything_connected: use a struct with
named options", 2016-07-15) unified many into check_connected(),
there still are different reasons why we call to find out about the
connectivity, and I doubt we can afford to have a single knob that
is shared both for transport and other kind of connectivity checks
(like fsck or repack).  Do we want to be affected by "we pretend
that these are the only refs exported from that alternate object
store" when repacking and pruning only local objects and keep us
rely on the alternate, for example?

In any case it is good that these configuration variables are
defined on _our_ side, not in the alternate---it means that we do
not have to worry about the case where the alternateRefsCommand lies
and tells us that an object that the alternate does not actually
have exists at a tip of a ref in an attempt to confuse us, etc.