From 6f029e744abc0f6d4cfe756d7e6b771be1be3999 Mon Sep 17 00:00:00 2001
From: Robin Krahl <robin.krahl@ireas.org>
Date: Sun, 6 Sep 2020 23:44:18 +0200
Subject: Fail if multiple matching devices are attached

Previously, we just applied our filter (if any) to all attached Nitrokey
devices and selected the first match when connection to a Nitrokey
device.  This may lead to unexpected behavior if multiple devices are
attached.  This patch changes the find_device function to return an
error if multiple matching devices are found.
---
 src/commands.rs | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'src/commands.rs')

diff --git a/src/commands.rs b/src/commands.rs
index ac3d020..883110a 100644
--- a/src/commands.rs
+++ b/src/commands.rs
@@ -61,6 +61,13 @@ fn find_device(config: &config::Config) -> anyhow::Result<nitrokey::DeviceInfo>
   let device = iter
     .next()
     .with_context(|| format!("Nitrokey device not found{}", format_filter(config)))?;
+
+  anyhow::ensure!(
+    iter.next().is_none(),
+    "Multiple Nitrokey devices found{}.  Use the --model and --serial-number options to \
+    select one",
+    format_filter(config)
+  );
   Ok(device)
 }
 
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