[PATCH 0/4] some v2 capability advertisement cleanups

While working on another series, I noticed that upload-pack will accept the "packfile-uris" directive even if we didn't advertise it. That's not a huge deal in practice, but the spec says we're not supposed to. And while cleaning that up, I noticed a bit of duplication in the existing advertisement/allow code.

So patches 1-3 clean up the situation a bit, and then patch 4 tightens up the packfile-uris handling.

There are some small textual conflicts with the series I just posted in:

  https://lore.kernel.org/git/20240228223700.GA1157826@coredump.intra.peff.net/

I'm happy to prepare this on top of that if it's easier.

  [1/4]: upload-pack: use repository struct to get config
  [2/4]: upload-pack: centralize setup of sideband-all config
  [3/4]: upload-pack: use existing config mechanism for advertisement
  [4/4]: upload-pack: only accept packfile-uris if we advertised it

 t/t5702-protocol-v2.sh | 18 +++++++++++++
 upload-pack.c          | 58 +++++++++++++++++++-----------------------
 2 files changed, 44 insertions(+), 32 deletions(-)

-Peff