[Tutor] Passing arguments to & running a python script on a remote machine from a python script on local machine .

[ashish makani]

Thanks a ton for the prompt reply & the great suggestions, Dave.

1.   A colleague gave this exact same suggestion
os.system ('ssh remoteuser at remote python remote.py arg1 "arg 2 has spaces"
arg3')

I was thinking spaces is my problem, so i initially tested the following
(no ssh)
os.system('python remote.py arg1 "arg 2 has spaces" arg3')  & it works :)

But sadly,  os.system ('ssh remoteuser at remote python remote.py arg1 "arg 2
has spaces" arg3')   does not :(

2. Also, you mentioned os.exec
Which would you recommend ?
os.system or os.exec ?

Thanks a lot,

cheers
ashish



On Thu, Sep 20, 2012 at 12:54 AM, Dave Angel <d at davea.name> wrote:

> On 09/19/2012 02:47 PM, ashish makani wrote:
> > Hi PyTutor Folks
> >
> > Here is my situation
> >
> > 1. I have two machines. Lets call them *local & remote.*
> > Both run ubuntu & both have python installed
> >
> > 2. I have a python script, *local.py*, running on *local *which needs to
> > pass arguments ( 3/4 string arguments, containing whitespaces like
> spaces,
> > etc ) to a python script, *remote.py* running on *remote* (the remote
> > machine).
> >
> > I have the following questions:
> >
> > 1. What's the best way to accomplish my task ?
> > I have researched quite a bit & so far found really conflicting & complex
> > workarounds.
> >
> > I googled & found people using several libraries to accomplish ssh to
> > remote machine & execute a command on remote machine.
> > paramiko <http://www.lag.net/paramiko/> ( now forked into the ssh
> > moduke<https://github.com/bitprophet/ssh>),
> > fabric <http://docs.fabfile.org/en/1.4.3/index.html>,
> > pushy<http://packages.python.org/pushy/>,etc
> >
> > People who have used any of these libraries, which one would you
> recommend,
> > as the most apt (simple & easy to use, lightweight, best performance,
> etc)
> > for my situation ?
> >
> > 2. I would prefer a solution, which does NOT require the installation of
> > extra libraries on the local & remote machines.
> > If installing external librar
> >
> > 3. Has anybody been able to do this using os.system ?
> >
> > I tried this
> >>>> import os
> >>>> *os.system ("ssh remoteuser at remote python remote.py arg1 arg2 arg3")*
> > *
> > *
> > This worked, but if the arguments i tried to pass, had spaces, i was not
> > able to 'escape' the spaces.
> >
> > Any & all explanations/links/code
> > snippets/thoughts/ideas/suggestions/feedback/comments/ of the Python
> tutor
> > community would be greatly appreciated.
> >
> > Thanks a ton
> >
> > cheers
> > ashish
> >
> > email :
> > ashish.makani
> > domain:gmail.com
> >
> > *“The only way to do great work is to love what you do. If you haven’t
> > found it yet, keep looking. Don’t settle. As with all matters of the
> heart,
> > you’ll know when you find it.” - Steve Jobs (1955 - 2011)*
> >
> >
>
> Since you prefer not installing any optional libraries, I'll just talk
> about your os.system() mechanism. Is that adequate for you, other than
> the problem with spaces?
>
> If so, then why not test it with the real ssh, to figure out where the
> quotes need to be to handle the spaces. Then once you have it working,
> use single quotes around the whole thing when calling os.exec().
>
> Something like (all untested):
>
> os.system ('ssh remoteuser at remote python remote.py arg1 "arg 2 has
> spaces" arg3')
>
>
> Or, more likely, build the arguments in separate variables, and use
>
> os.system( 'ssh remoteuser at remote python remote.py "%s" "%s" "%s"' %
> (arg1, arg2, arg3) )
>
> that will fail if the argn already has quotes in it. You can get much
> fancier with encoding, which will add backslashes in front of some
> characters, etc. But keep it simple if you can.
>
> I ought to give the obligatory: use the multiprocess module instead of
> os.exec, but if something works for you, I'm not going to argue.
>
>
>
>
> --
>
> DaveA
>
>
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