3c7e957126
Previously, we only validated names for character restrictions. This is helpful, but we should've also checked length restrictions- dataset names must be restricted to MAXNAMELEN. While here, move validation before doing a bunch of concatenations and fix error handling in be_rename. It was previously setting the error state based on return value from a libzfs function, which is wrong: libzfs errors don't necessarily match cleanly to libbe errors. This would cause the assertion in be_error to hit when the error was printed.
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