[Twisted-Python] How to tell when SSH command has finished in Conch?

Craig Rodrigues rodrigc at crodrigues.org
Wed Jan 9 13:19:43 EST 2013


I have a very similar question to the one that Vye Wilson
recently asked, "Subject: What is The Correct Way to Close a Twisted Conch
SSH Connection?"

I am using Twisted Conch to write a program that
ssh's into multiple machines and executes a single command.

I am basically trying to do the equivalent of:

for host in host1 host2 host3
     ssh  user at host "cat /etc/hosts"

To start things off, I took
and started modifying it.  Here is the code which I have:


The problem is, I can't figure out how to tell when a command has
completed, so that I can call reactor.stop().

Not in the code example I posted above, I tried to use a DeferredList by
following the example code in this blog


but I ran into the same problem where I couldn't figure out how
to tell when my command over SSH had terminated.

As a kluge, I called reactor.callLater() with a timeout of
20 seconds, and then called reactor.stop().

Any ideas as to what I am doing wrong?
Where in the Conch framework can I tell when a command
over SSH has finished?


Craig Rodrigues
rodrigc at crodrigues.org
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