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Return the current branch, or None if HEAD isn't at a branch
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Return (sha_or_none, is_branch), where sha_or_none is a commit hash
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Resolve a revision to a new RevOptions object with the SHA1 of the
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Return whether the current commit hash equals the given name.
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Prefixes stub URLs like 'user@hostname:user/repo.git' with 'ssh://'.
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