Add OnlyKey support

libagent/ssh/protocol.py

@@ -149,9 +149,9 @@ class Handler:
         try:
             sig_bytes = key['verifier'](sig=signature, msg=blob)
             log.info('signature status: OK')
-        except formats.ecdsa.BadSignatureError:
+        except formats.ecdsa.BadSignatureError as e:
             log.exception('signature status: ERROR')
-            raise ValueError('invalid ECDSA signature')
+            raise ValueError('invalid ECDSA signature') from e
 
         log.debug('signature size: %d bytes', len(sig_bytes))
 

libagent/ssh/tests/test_client.py

@@ -17,6 +17,10 @@ PUBKEY_TEXT = ('ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzd'
 
 class MockDevice(device.interface.Device):  # pylint: disable=abstract-method
 
+    @classmethod
+    def package_name(cls):
+        return 'fake-device-agent'
+
     def connect(self):  # pylint: disable=no-self-use
         return mock.Mock()