[PATCH 0/2] Hiding some refs in ls-remote

This is an early preview of reducing the network cost while talking with a repository with tons of refs, most of which are of use by very narrow audiences (e.g. refs under Gerrit's refs/changes/ are useful only for people who are interested in the changes under review). As long as these narrow audiences have a way to learn the names of refs or objects pointed at by the refs out-of-band, it is not necessary to advertise these refs.

On the server end, you tell upload-pack that some refs do not have to be advertised with the uploadPack.hiderefs multi-valued configuration variable:

	[uploadPack]
		hiderefs = refs/changes

The changes necessary on the client side to allow fetching objects at the tip of a ref in hidden hierarchies are much more involved and not part of this early preview, but the end user UI is expected to be like these:

	$ git fetch $there refs/changes/72/41672/1
	$ git fetch $there 9598d59cdc098c5d9094d68024475e2430343182

That is, you ask for a refname as usual even though it is not part of ls-remote response, or you ask for the commit object that is at the tip of whatever hidden ref you are interested in.

Junio C Hamano (2):
  upload-pack: share more code
  upload-pack: allow hiding ref hiearchies

 t/t5512-ls-remote.sh |  9 ++++++
 upload-pack.c        | 86 ++++++++++++++++++++++++++++++++++++++++++----------
 2 files changed, 79 insertions(+), 16 deletions(-)