Here is v3.  It is also available on GitHub [1].

Thanks to Junio and Brad for their comments about v2.  I think I have
addressed all of your comments (except for Junio's regrets that the
series didn't include a transactional receive-pack).

See the mailing list threads about v1 [2] and v2 [3] and the
longer-term goals of this campaign [4].

Changes since v2:

* Rebased to current master (there were no conflicts)

* Don't allow ref_transation_create() with new_sha1 set to zeros.

* Don't allow ref_transation_delete() with old_sha1 set to zeros.

* Fixed subject lines to use lower-case after the colon.

* Expanded a few commit messages, fixed a comment, and removed some
  "squash" detritus in a commit message.


[1], branch ref-transactions

Michael Haggerty (27):
  t1400: fix name and expected result of one test
  t1400: provide more usual input to the command
  parse_arg(): really test that argument is properly terminated
  t1400: add some more tests involving quoted arguments
  refs.h: rename the action_on_err constants
  update_refs(): fix constness
  update-ref --stdin: read the whole input at once
  parse_cmd_verify(): copy old_sha1 instead of evaluating <oldvalue>
  update-ref.c: extract a new function, parse_refname()
  update-ref --stdin: improve error messages for invalid values
  update-ref --stdin: make error messages more consistent
  update-ref --stdin: simplify error messages for missing oldvalues
  t1400: test that stdin -z update treats empty <newvalue> as zeros
  update-ref.c: extract a new function, parse_next_sha1()
  update-ref --stdin -z: deprecate interpreting the empty string as
  t1400: test one mistake at a time
  update-ref --stdin: improve the error message for unexpected EOF
  update-ref --stdin: harmonize error messages
  refs: add a concept of a reference transaction
  update-ref --stdin: reimplement using reference transactions
  refs: remove API function update_refs()
  struct ref_update: rename field "ref_name" to "refname"
  struct ref_update: store refname as a FLEX_ARRAY
  ref_transaction_commit(): simplify code using temporary variables
  struct ref_update: add a lock field
  struct ref_update: add a type field
  ref_transaction_commit(): work with transaction->updates in place

 Documentation/git-update-ref.txt       |  18 +-
 builtin/checkout.c                     |   2 +-
 builtin/clone.c                        |   9 +-
 builtin/merge.c                        |   6 +-
 builtin/notes.c                        |   6 +-
 builtin/reset.c                        |   6 +-
 builtin/update-ref.c                   | 425 ++++++++++++++++++++-------------
 contrib/examples/builtin-fetch--tool.c |   3 +-
 notes-cache.c                          |   2 +-
 notes-utils.c                          |   3 +-
 refs.c                                 | 195 +++++++++++----
 refs.h                                 |  94 ++++++--
 t/                  | 100 +++++---
 13 files changed, 585 insertions(+), 284 deletions(-)


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