handle directory symlinks in RecursivelyCopyOrLinkfile() #3330
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This would blow up as we assume the path is a file if it's not a directory here. This then opens the "file" here, resolving the symlink. If that symlink was a symlink to a directory, we then end up trying to
io.Copy()
it here, which results in acopy_file_range: is a directory
error.