[PATCH 0/3] Server side automatic tag following

As promised earlier, this series adds automatic tag following on
the server side, allowing git-fetch to grab tags over a single
connection rather than opening a secondary one for the tags we
cannot get via my 'sp/fetch-optim' branch.

  1)  git-pack-objects: Automatically pack annotated tags if object was packed
  2)  Teach fetch-pack/upload-pack about --auto-follow-tags
  3)  Teach git-fetch to exploit server side automatic tag following

 Documentation/git-fetch-pack.txt   |    8 +++-
 Documentation/git-pack-objects.txt |    5 ++
 builtin-fetch-pack.c               |    9 +++-
 builtin-fetch.c                    |    3 +
 builtin-pack-objects.c             |   24 +++++++++-
 fetch-pack.h                       |    3 +-
 t/t5305-autofollow-tag.sh          |   84 ++++++++++++++++++++++++++++++++++++
 t/t5503-tagfollow.sh               |   26 +++++++++++
 transport.c                        |    5 ++
 transport.h                        |    3 +
 upload-pack.c                      |   10 +++-
 11 files changed, 172 insertions(+), 8 deletions(-)


We may still want to support multiple request/pack pairs on a single
connection, but I think that's more work than this is and may not
offer a worthwhile pay-off.  Usually the client knows what branches
it wants when it connects, and if it wants tag data.  That's all
we need to know on the server to generate an optimal packfile, and
said packfile is the only thing the client needs to update itself.

The multiple request/pack pairs is actually better implemented for
users like X.org where you want to update many repositories over
a single SSH connection.  For that we need git-fetch to multiplex
over multiple repositories, not just git-upload-pack.

-- 
Shawn.