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authorAndrew Suffield <asuffield@gmail.com>2021-03-25 10:21:38 +0000
committerGitHub <noreply@github.com>2021-03-25 11:21:38 +0100
commitbf3471db54b0255ab5b159005069f37528a151b7 (patch)
tree9e91aa4f9c1de64aab04a04125e176fbbf3aa983 /plumbing/object.go
parent55ba7b2e0f7a1c542c88022d65b16ca79a300e6c (diff)
downloadgo-git-bf3471db54b0255ab5b159005069f37528a151b7.tar.gz
add RequireRemoteRefs to PushOptions (#258)
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 (#101), which is mostly an exercise in computing the correct hash to require. Hence, this appears to be the most reasonable API to expose.
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