zmq.ssh.tunnel.openssh_tunnel does not fail when it should

[mristin]

Hi!

I noticed that zmq.ssh.tunnel.openssh_tunnel does not fail when it should. If I just call:

import time

import zmq
import zmq.ssh

ctx = zmq.Context()
publisher = ctx.socket(zmq.PUB)

ssh_tunnel_pid = zmq.ssh.tunnel_connection(
    socket=publisher,
    addr="tcp://127.0.0.7:43777",
    server="localhostA", # mind the typo
    password=None,
    keyfile=None)

time.sleep(10)

there will be no error. However, on line 230 in zmq/ssh/tunnel.py:

tunnel = pexpect.spawn(cmd, env=env)

, the value of cmd is: ssh -f -S none -L 127.0.0.1:47209:127.0.0.7:43777 localhostA sleep 60

If I execute this command in my bash, I get: ssh: Could not resolve hostname localhosta: Name or service not known

Before I dive deeper and get myself familiar with pexpect to try to fix the bug (and submit a patch), could you give me any pointers what might cause this problem? Is this maybe expected behavior?

Thank you very much for your time!

[mristin]

Hi!
Any chance you could give me some pointers on this? Should I submit a pull request and make sure the expected behavior is to raise an error?