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Fazlul Shahriar authored
os.Rename documentation says: "OS-specific restrictions may apply when oldpath and newpath are in different directories." On Unix, this means we can't rename across devices. On Plan 9 however, the functionality is even more limited: cross-directory renames are not allowed at all. Add a wrapper around os.Rename for Plan 9, which will copy the file if we're renaming across directory. All tests seems to pass. (Aside: I also had to write this wrapper to get go-git working on Plan 9: https://github.com/go-git/go-billy/blob/v5.0.0/osfs/os_plan9.go#L27 but I notice few issues with that one.) Fixes #86
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