Paramiko simulate ssh -t option

Question

I instantiate a paramiko channel, then I execute a command and get its output:

channel = transport.open_session()
channel.exec_command('service myservice restart')

stdout = channel.makefile('rb')

for line in stdout:
    print line,

However, after executing the command (which finishes), the output iterating gets blocked.

I tested with ssh:

ssh myhost service myservice restart     # terminal gets blocked
ssh -t myhost service myservice restart  # OK

So I want to simulate the "-t" option in paramiko. So far I tried:

channel = transport.open_session()
channel.get_pty()
channel.invoke_shell()

stdin, stdout = channel.makefile('wb'), channel.makefile('rb')
stdin.write('service myservice restart\n')

for line in stdout:
    print line,

But now, stdout doesn't get closed, and the for never ends.

Any ideas?

djc djc · Accepted Answer · 2012-12-16T17:29:16

It appears like invoke_shell() returns a Channel, and it looks like Channels require that you close them explicitly. I would attempt to close some of the channels you're opening, in particular the one returned by invoke_shell().

Paramiko simulate ssh -t option

2 Answers