[fix] Workaround channel.recv_exit_status not accepting timeout param

Author: Alexandre Vincent

openwisp_controller/connection/connectors/ssh.py

@@ -196,7 +196,12 @@ def exec_command(
             logger.exception(e)
             raise e
         # store command exit status
-        exit_status = stdout.channel.recv_exit_status()
+        # workaround https://github.com/paramiko/paramiko/issues/1815
+        # workaround https://github.com/paramiko/paramiko/issues/1787
+        # Ref. https://docs.paramiko.org/en/stable/api/channel.html#paramiko.channel.Channel.recv_exit_status  # noqa
+        stdout.channel.status_event.wait(timeout=timeout)
+        assert stdout.channel.status_event.is_set()
+        exit_status = stdout.channel.exit_status
         # log standard output
         # try to decode to UTF-8, ignoring unconvertible characters
         # https://docs.python.org/3/howto/unicode.html#the-string-type