Make *Error, Model, DeviceWrapper non-exhaustive

Previously, all enums defined by the nitrokey crate were exhaustive.
This means that adding new variants to these enums is a breaking change.
To make it possible to add new features to nitrokey-rs without breaking
compatibility, this patch marks the Error, CommandError,
CommunicationError, LibraryError, Model and DeviceWrapper enums as
non-exhaustive.

4 files changed, 8 insertions, 0 deletions

diff --git a/CHANGELOG.md b/CHANGELOG.md
index cd43612..80efb57 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,8 @@ SPDX-License-Identifier: CC0-1.0
 
 # Unreleased
 - Export the `FirmwareVersion` struct.
+- Mark the `Error`, `CommandError`, `CommunicationError`, `LibraryError`,
+  `Model` and `DeviceWrapper` enums as non-exhaustive.
 
 # v0.7.1 (2020-08-30)
 - Remove the custom `std::error::Error::source` implementation for
diff --git a/src/device/mod.rs b/src/device/mod.rs
index c84faa1..e9018a4 100644
--- a/src/device/mod.rs
+++ b/src/device/mod.rs
@@ -28,6 +28,7 @@ pub use wrapper::DeviceWrapper;
 
 /// Available Nitrokey models.
 #[derive(Clone, Copy, Debug, PartialEq)]
+#[non_exhaustive]
 pub enum Model {
     /// The Nitrokey Storage.
     Storage,
diff --git a/src/device/wrapper.rs b/src/device/wrapper.rs
index 69291ad..942a905 100644
--- a/src/device/wrapper.rs
+++ b/src/device/wrapper.rs
@@ -64,6 +64,7 @@ use crate::otp::GenerateOtp;
 ///
 /// [`connect`]: struct.Manager.html#method.connect
 #[derive(Debug)]
+#[non_exhaustive]
 pub enum DeviceWrapper<'a> {
     /// A Nitrokey Storage device.
     Storage(Storage<'a>),
diff --git a/src/error.rs b/src/error.rs
index 64a2ce0..f1e91c3 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -11,6 +11,7 @@ use crate::device;
 
 /// An error returned by the nitrokey crate.
 #[derive(Debug)]
+#[non_exhaustive]
 pub enum Error {
     /// An error reported by the Nitrokey device in the response packet.
     CommandError(CommandError),
@@ -111,6 +112,7 @@ impl fmt::Display for Error {
 
 /// An error reported by the Nitrokey device in the response packet.
 #[derive(Clone, Copy, Debug, PartialEq)]
+#[non_exhaustive]
 pub enum CommandError {
     /// A packet with a wrong checksum has been sent or received.
     WrongCrc,
@@ -177,6 +179,7 @@ impl fmt::Display for CommandError {
 
 /// A device communication error.
 #[derive(Clone, Copy, Debug, PartialEq)]
+#[non_exhaustive]
 pub enum CommunicationError {
     /// Could not connect to a Nitrokey device.
     NotConnected,
@@ -215,6 +218,7 @@ impl fmt::Display for CommunicationError {
 
 /// A library usage error.
 #[derive(Clone, Copy, Debug, PartialEq)]
+#[non_exhaustive]
 pub enum LibraryError {
     /// A supplied string exceeded a length limit.
     StringTooLong,