[PATCH 0/3] Use ref transactions for fetch

This change is based on the previous ref transaction patches. This is sent as a separate patch series since it implements a lot more non-trivial changes to the behaviour than the previous patches and thus can use more detailed review.

Update fetch.c to use ref transactions when performing updates. Use a single ref transaction for all updates and only commit the transaction if all other checks and oeprations have been successful. This makes the ref updates during a fetch (mostly) atomic.

Ronnie Sahlberg (3):
  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

 builtin/fetch.c | 39 ++++++++++++++++++++++-----------------
 1 file changed, 22 insertions(+), 17 deletions(-)