[PATCH 0/9] atomic pushes

This patch series adds a flag to git push to update the remote refs atomically.

All comments from Eric and Junio have been incorporated.

The patch to negotiate the atomic push protocol was ripped apart and we have one commit for the receiving side and one for the sending side, so the order of new functionality introduced should not bring any bisect breakages.

The remote side learned the receive.advertiseatomic config option and a test was added, that the user cannot push any more if they ask for --atomic but the server doesn't advertise atomic.

But as of writing this cover letter I have a question on the security implications here. If we ask the remote side to not advertise atomic, (say because of some problem with too many file descriptors open) but the client side (being a malicious client, not possible with the code presented in this patch series) does ask for atomic, the server should not obey the request to handle it atomic. I just added that as well.

How about other capabilites requested such as "report-status", "side-band-64k" and "quiet" ?

This series applies on top of origin/mh/reflog-expire

Any comments are welcome!

Thanks, Stefan

Ronnie Sahlberg (3):
  receive-pack.c: negotiate atomic push support
  send-pack.c: add --atomic command line argument
  push.c: add an --atomic argument

Stefan Beller (6):
  receive-pack.c: shorten the execute_commands loop over all commands
  receive-pack.c: move iterating over all commands outside
    execute_commands
  receive-pack.c: move transaction handling in a central place
  receive-pack.c: add execute_commands_atomic function
  send-pack: rename ref_update_to_be_sent to check_to_send_update
  t5543-atomic-push.sh: add basic tests for atomic pushes

 Documentation/git-push.txt                        |   7 +-
 Documentation/git-send-pack.txt                   |   7 +-
 Documentation/technical/protocol-capabilities.txt |  13 +-
 builtin/push.c                                    |   5 +
 builtin/receive-pack.c                            | 166 ++++++++++++++----
 builtin/send-pack.c                               |   6 +-
 remote.h                                          |   3 +-
 send-pack.c                                       |  65 +++++++-
 send-pack.h                                       |   3 +-
 t/t5543-atomic-push.sh                            | 194 ++++++++++++++++++++++
 transport.c                                       |   5 +
 transport.h                                       |   1 +
 12 files changed, 425 insertions(+), 50 deletions(-)
 create mode 100755 t/t5543-atomic-push.sh