[PATCH v3 0/8] Hiding refs

The third round.

 - Multi-valued variable transfer.hiderefs lists prefixes of ref
   hierarchies to be hidden from the requests coming over the
   network.

 - A configuration optionally allows uploadpack to accept fetch
   requests for an object at the tip of a hidden ref.

Elsewhere, we discussed "delaying ref advertisement" (aka "expand refs"), but it is an orthogonal feature and this "hiding refs completely from advertisement" series does not attempt to address.

Patch #2 (simplify request validation), #4 (clarify the codeflow), and #5 (use struct ref) are new. The are all long overdue clean-ups for these codepaths.

The last patch is an illustration why it wouldn't make sense to optionally allow pushing into hidden refs, and not meant to be part of the series proper.

For those who missed it, earlier rounds are at:

    http://thread.gmane.org/gmane.comp.version-control.git/213951
    http://thread.gmane.org/gmane.comp.version-control.git/214888

Junio C Hamano (8):
  upload-pack: share more code
  upload-pack: simplify request validation
  upload/receive-pack: allow hiding ref hierarchies
  parse_fetch_refspec(): clarify the codeflow a bit
  fetch: use struct ref to represent refs to be fetched
  upload-pack: optionally allow fetching from the tips of hidden refs
  fetch: fetch objects by their exact SHA-1 object names
  WIP: receive.allowupdatestohidden

 Documentation/config.txt |  23 +++++++++++
 builtin/fetch-pack.c     |  40 +++++++++++++++----
 builtin/receive-pack.c   |  31 +++++++++++++++
 cache.h                  |   3 +-
 fetch-pack.c             | 101 ++++++++++++++++++++++++++++++++---------------
 fetch-pack.h             |  11 +++---
 refs.c                   |  41 +++++++++++++++++++
 refs.h                   |   3 ++
 remote.c                 |  41 ++++++++++---------
 remote.h                 |   1 +
 t/t5512-ls-remote.sh     |   9 +++++
 t/t5516-fetch-push.sh    |  82 ++++++++++++++++++++++++++++++++++++++
 transport.c              |   9 +----
 upload-pack.c            |  86 ++++++++++++++++++++++++----------------
 14 files changed, 374 insertions(+), 107 deletions(-)