thodg/libgit2/include

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  • Hash : 95b7a639
    Author : David Turner
    Date : 2021-04-14T21:52:36 

    git_reference_create_matching: Treat all-zero OID as "must be absent"

This is pretty useful in avoiding races: I want to create a ref only if
it doesn't already exist.  I can't check first because of TOCTOU -- by
the time I finish the check, someone else might have already created
the ref.  And I can't take a lock because then I can't do the create,
since the create expects to take the lock.

The semantics are inspired by git update-ref, which allows an all-zero old
value to mean that the ref must not exist.

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