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AsStr is automatically implementeded if Display is implemented, so
having a manual as_str() method is not necessary.
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Communication errors returned by libnitrokey were previously not mapped
to an error type in the nitrokey crate. We introduce the
CommunicationError enum to represent these errors.
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Previously, library errors were part of the CommandError enum. As
command errors and library errors are two different error types, they
should be split into two enums.
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An error code can not only indiciate a command error, but also a library
or device communication error. Therefore, the variant for an unknown
error code should be placed in the top-level Error enum instead of the
CommandError enum.
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We reserve CommandError for errors returned by the Nitrokey device.
Errors during random number generation should have their own type.
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This patch changes all public functions to return the Error enum instead
of the CommandError enum. This breaks the tests which will be fixed
with the next patch.
This patch also adds a placeholder variant Error::CommandError and a
placeholder enum CommandError to make the transition to a new
nitrokey-test version easier.
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The Error enum is a wrapper for the possible error types (currently only
CommandError). Result<T> is defined as Result<T, Error>.
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This prepares the refactoring of util::CommandError into multiple enums.
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