Commits on Feb 18, 2021

1. add RequireRemoteRefs to PushOptions …

   The git protocol itself uses a compare-and-swap mechanism, where changes
   send the old and new values and the change is only applied if the old
   value matches. This is used to implement the --force-with-lease feature
   in git push.
   
   go-git populates the `old` field with the current value of the ref that
   is read from the remote. We can implement a convenient (albeit more
   limited) form of the --force-with-lease feature just by allowing the
   caller to specify particular values for this ref.
   
   Callers can then implement complex multi-step atomic operations by
   reading the ref themselves at the start of the process, and passing to
   in RequireRemoteRefs at the end. This is also a suitable building block
   for implementing --force-with-lease (go-git#101), which is mostly an exercise
   in computing the correct hash to require. Hence, this appears to be the
   most reasonable API to expose.

   

   asuffield committed Feb 18, 2021
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