[PATCH v4 0/8] Multiple simultaneously locked ref updates

Hi Folks,

Here is the fourth revision of a series to support locking multiple refs at the same time to update all of them consistently. The previous revisions of the series can be found at $gmane/233260, $gmane/233458, and $gmane/233647.

Updates since the previous revision of the series:

* Patches 1-4 are identical

* Patches 5-7 no longer have ":" at the end of comments, a style I
  "learned" from the context of patch 5 but that I saw Junio squash
  out of patch 5 v2 when he queued it as 53237ae4.

* Patch 7 has a re-organized parser and now defines a -z format for
  stdin that terminates arguments with NUL and lines with LF NUL:

   ... <ref> NUL <newvalue> NUL [ <oldvalue> NUL ] LF NUL

* Patch 8 now has test cases for -z mode and updated error cases for
  the re-organized parser.

Note to maintainer:

* Patch 4 needs to be re-queued to replace c7c80f49 due to the
  tweak suggested in $gmane/233521 and made in v3 and kept in v4.

Thanks, -Brad

Brad King (8):
  reset: rename update_refs to reset_refs
  refs: report ref type from lock_any_ref_for_update
  refs: factor update_ref steps into helpers
  refs: factor delete_ref loose ref step into a helper
  refs: add function to repack without multiple refs
  refs: add update_refs for multiple simultaneous updates
  update-ref: support multiple simultaneous updates
  update-ref: add test cases covering --stdin signature

 Documentation/git-update-ref.txt |  22 +-
 branch.c                         |   2 +-
 builtin/commit.c                 |   2 +-
 builtin/fetch.c                  |   3 +-
 builtin/receive-pack.c           |   3 +-
 builtin/reflog.c                 |   2 +-
 builtin/replace.c                |   2 +-
 builtin/reset.c                  |   4 +-
 builtin/tag.c                    |   2 +-
 builtin/update-ref.c             | 144 ++++++++++++-
 fast-import.c                    |   2 +-
 refs.c                           | 195 ++++++++++++++---
 refs.h                           |  22 +-
 sequencer.c                      |   3 +-
 t/t1400-update-ref.sh            | 445 +++++++++++++++++++++++++++++++++++++++
 15 files changed, 812 insertions(+), 41 deletions(-)