Include Nitrokey model in error message when no device is found

For functionality that explicitly works with the storage device we emit
an error message stating that a "Nitrokey Storage" device could not be
found. When the user chooses the model using the -m/--model argument
that is not the case.
With this patch we adjust the error message printed.

2 files changed, 14 insertions, 3 deletions

diff --git a/nitrocli/src/args.rs b/nitrocli/src/args.rs
index ae09c07..b83c495 100644
--- a/nitrocli/src/args.rs
+++ b/nitrocli/src/args.rs
@@ -108,6 +108,15 @@ Enum! {DeviceModel, [
   Storage => "storage",
 ]}
 
+impl DeviceModel {
+  pub fn as_user_facing_str(&self) -> &str {
+    match self {
+      DeviceModel::Pro => "Pro",
+      DeviceModel::Storage => "Storage",
+    }
+  }
+}
+
 impl From<DeviceModel> for nitrokey::Model {
   fn from(model: DeviceModel) -> nitrokey::Model {
     match model {
diff --git a/nitrocli/src/commands.rs b/nitrocli/src/commands.rs
index 208a0ec..583870b 100644
--- a/nitrocli/src/commands.rs
+++ b/nitrocli/src/commands.rs
@@ -62,10 +62,12 @@ fn get_device(ctx: &mut args::ExecCtx<'_>) -> Result<nitrokey::DeviceWrapper> {
   set_log_level(ctx);
 
   match ctx.model {
-    Some(model) => nitrokey::connect_model(model.into()),
-    None => nitrokey::connect(),
+    Some(model) => nitrokey::connect_model(model.into()).map_err(|_| {
+      let error = format!("Nitrokey {} device not found", model.as_user_facing_str());
+      Error::Error(error)
+    }),
+    None => nitrokey::connect().map_err(|_| Error::from("Nitrokey device not found")),
   }
-  .map_err(|_| Error::from("Nitrokey device not found"))
 }
 
 /// Connect to a Nitrokey Storage device and return it.