[PATCH v2 0/6] receive-pack hooks over sideband

This is a respin of the patch I posted yesterday.  Same idea,
we want to make the messages printed by hooks available over the
sideband protocol so git:// and http:// smart clients are able to
present them, similar to how ssh:// works.

No real major changes from v1, the series is just broken apart to
make it easier to review, and Erik Faye-Lund's patch was integrated
to get a bidirectional async interface, rather than my hacked
.is_reader attempt in v1.

Erik Faye-Lund (1):
  run-command: support custom fd-set in async

Shawn O. Pearce (5):
  run-command: Allow stderr to be a caller supplied pipe
  send-pack: demultiplex a sideband stream with status data
  receive-pack: Refactor how capabilities are shown to the client
  receive-pack: Wrap status reports inside side-band-64k
  receive-pack: Send hook output over side band #2

 Documentation/technical/api-run-command.txt |   52 ++++++++++---
 builtin-fetch-pack.c                        |    7 +-
 builtin-receive-pack.c                      |  111 +++++++++++++++++++++------
 builtin-send-pack.c                         |   66 ++++++++++++----
 convert.c                                   |    5 +-
 remote-curl.c                               |    7 +-
 run-command.c                               |   91 +++++++++++++++++++---
 run-command.h                               |   11 ++-
 t/t5401-update-hooks.sh                     |   22 +++---
 upload-pack.c                               |    7 +-
 10 files changed, 290 insertions(+), 89 deletions(-)