[Twisted-Python] Execute interactive commands with a custom ssh shell

The Noob thenoob06 at gmail.com
Sat Aug 16 14:06:48 EDT 2008

Thanks very much Jean-Paul for your answer.
I will try to implement reactor.spawnProcess with this example.
Best Regards

2008/8/16 Jean-Paul Calderone <exarkun at divmod.com>

> On Sat, 16 Aug 2008 14:04:22 +0200, The Noob <thenoob06 at gmail.com> wrote:
>> Hello all,
>> I try to implement a custom ssh server with twisted . I use* sshserver.py
>> to
>> begin (* http://www.devshed.com/c/a/Python/SSH-with-Twisted/ )
>> I would like to execute interactive scripts which are on my server. The
>> problem is theses scripts are interactives. How can I redirect IO on my
>> shell ?
>> For example, if I want to install a software with apt. I have questions to
>> install dependencies ( yes/no)
>> I start to create a definition for this function like def do_apt. And then
>> when in my custom shell I execute ( apt python)., that executes apt-get
>> install python on the server. But how can I redirect the output in my
>> shell
>> to answer dependencies questions ?
>> Thanks for your help
> To run a program like apt, you must be using `reactor.spawnProcess´.  That
> means that you have two different protocol implementations.  One to talk
> to the SSH connection (eg, `SSHDemoProtocol´ in the O'Reilly example) and
> one to talk to the child process.
> If you want output from the child process to show up in the SSH client,
> then
> when the process protocol receives data from it, it should pass it on to
> the
> SSH protocol to write to the client.  Similarly, if you want input from the
> SSH client written to the stdin of the child process, when the SSH protocol
> receives data it should pass it on to the process protocol to write to the
> child process.
> You'll have to keep track of what state your application is in to do this
> correctly.  Input should only be handled this way when there is actually
> a child process running.
> Jean-Paul
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