[RFC][PATCH 0/3] Different views on a repository

Hello,

we have a use case with groups of repositories which share lots of objects, but which are logically independent. There is no strict hierarchy between the repositories, the development modl is arbitrary. The alternates mechanism for sharig objects between repositories won't work.

The best idea I came up with so far to solve this was to keep everything in the same repository on the server. Then, to keep the logically independent repositories separate, directories are used below refs/heads and refs/tags. Receive-pack and upload-pack are modified to hide this directory structure from clients so that repositories will continue to look "normal" to users. For example, the following structure on the server:

	refs/heads/one/master
	refs/tags/one/tag1
	refs/heads/two/master
	refs/heads/two/branch2

would appear as two independent repositories to different clients:

	refs/heads/master
	refs/tags/tag1

and:

	refs/heads/master
	refs/heads/branch2

The following three patches implement this. What do you guys think -- does the basic idea and implementation look sensible, or am I overlooking a way to solve this kind of problem with other means?

Thanks!

  receive-pack: Two small code cleanups
  Different views on a repository
  Different views on a repository: HEAD mapping

 Documentation/git-receive-pack.txt |    9 ++++-
 Documentation/git-upload-pack.txt  |   10 +++++-
 builtin-receive-pack.c             |   32 ++++++++++++++---
 refs.c                             |   65 ++++++++++++++++++++++++++++++++++--
 refs.h                             |    4 ++
 upload-pack.c                      |   20 ++++++++++-
 6 files changed, 127 insertions(+), 13 deletions(-)