Test if USB device is presented

11 years ago · 1fa4f1eb81
parent 8f42da3fcc
commit 1fa4f1eb81
1 changed files with 4 additions and 1 deletions
--- a/cmd.py
+++ b/cmd.py
@ -44,7 +44,10 @@ def get_transport(transport_string, path):
        from bitkeylib.transport_hid import HidTransport

        if path == '':
-            path = list_usb()[0]
+            try:
+                path = list_usb()[0]
+            except IndexError:
+                raise Exception("No Trezor found on USB")

        return HidTransport(path)