[PATCH v12 00/44] Use ref transactions for all ref updates

This patch series can also be found at https://github.com/rsahlberg/git/tree/ref-transactions

Ronnie please review these remaining patches in this series.

 Sahlberg (44):
  refs.c: constify the sha arguments for
    ref_transaction_create|delete|update
  refs.c: allow passing NULL to ref_transaction_free
  refs.c: add a strbuf argument to ref_transaction_commit for error
    logging
  refs.c: add an err argument to repack_without_refs
  refs.c: make ref_update_reject_duplicates take a strbuf argument for
    errors
  refs.c: add an err argument to delete_ref_loose
  refs.c: make update_ref_write update a strbuf on failure
  update-ref.c: log transaction error from the update_ref
  refs.c: remove the onerr argument to ref_transaction_commit
  refs.c: change ref_transaction_update() to do error checking and
    return status
  refs.c: change ref_transaction_create to do error checking and return
    status
  refs.c: ref_transaction_delete to check for error and return status
  tag.c: use ref transactions when doing updates
  replace.c: use the ref transaction functions for updates
  commit.c: use ref transactions for updates
  sequencer.c: use ref transactions for all ref updates
  fast-import.c: change update_branch to use ref transactions
  branch.c: use ref transaction for all ref updates
  refs.c: change update_ref to use a transaction
  refs.c: free the transaction before returning when number of updates
    is 0
  refs.c: ref_transaction_commit should not free the transaction
  fetch.c: clear errno before calling functions that might set it
  fetch.c: change s_update_ref to use a ref transaction
  fetch.c: use a single ref transaction for all ref updates
  receive-pack.c: use a reference transaction for updating the refs
  fast-import.c: use a ref transaction when dumping tags
  walker.c: use ref transaction for ref updates
  refs.c: make write_ref_sha1 static
  refs.c: make lock_ref_sha1 static
  refs.c: add transaction.status and track OPEN/CLOSED/ERROR
  refs.c: remove the update_ref_lock function
  refs.c: remove the update_ref_write function
  refs.c: remove lock_ref_sha1
  refs.c: make prune_ref use a transaction to delete the ref
  refs.c: make delete_ref use a transaction
  refs.c: pass the ref log message to _create/delete/update instead of
    _commit
  refs.c: pass NULL as *flags to read_ref_full
  refs.c: pack all refs before we start to rename a ref
  refs.c: move the check for valid refname to lock_ref_sha1_basic
  refs.c: call lock_ref_sha1_basic directly from commit
  refs.c: add a new flag for transaction delete for refs we know are
    packed only
  refs.c: pass a skip list to name_conflict_fn
  refs.c: make rename_ref use a transaction
  refs.c: remove forward declaration of write_ref_sha1

 branch.c               |  30 ++--
 builtin/commit.c       |  24 ++-
 builtin/fetch.c        |  29 +--
 builtin/receive-pack.c |  21 +--
 builtin/replace.c      |  15 +-
 builtin/tag.c          |  15 +-
 builtin/update-ref.c   |  32 ++--
 cache.h                |   2 +
 fast-import.c          |  42 +++--
 lockfile.c             |  21 ++-
 refs.c                 | 468 +++++++++++++++++++++++++++++--------------------
 refs.h                 |  54 +++---
 sequencer.c            |  24 ++-
 t/t3200-branch.sh      |   2 +-
 walker.c               |  51 +++---
 15 files changed, 491 insertions(+), 339 deletions(-)