Introduce VolumeMode enum in device

The VolumeMode enum will be used when setting the access mode for the
unencrypted volume.  It can also be used when refactoring the
VolumeStatus enum in a future release.

1 files changed, 18 insertions, 0 deletions

diff --git a/src/device.rs b/src/device.rs
index e047975..792ac2f 100644
--- a/src/device.rs
+++ b/src/device.rs
@@ -33,6 +33,24 @@ impl fmt::Display for Model {
     }
 }
 
+/// The access mode of a volume on the Nitrokey Storage.
+#[derive(Clone, Copy, Debug, PartialEq)]
+pub enum VolumeMode {
+    /// A read-only volume.
+    ReadOnly,
+    /// A read-write volume.
+    ReadWrite,
+}
+
+impl fmt::Display for VolumeMode {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match *self {
+            VolumeMode::ReadOnly => f.write_str("read-only"),
+            VolumeMode::ReadWrite => f.write_str("read-write"),
+        }
+    }
+}
+
 /// A wrapper for a Nitrokey device of unknown type.
 ///
 /// Use the function [`connect`][] to obtain a wrapped instance.  The wrapper implements all traits