newbie: popen question

Jeremiah Dodds jeremiah.dodds at gmail.com
Thu May 28 10:25:06 CEST 2009


On Thu, May 28, 2009 at 9:11 AM, Sean DiZazzo <half.italian at gmail.com>wrote:

> On May 27, 6:10 pm, thebiggestbangthe... at gmail.com wrote:
> > hello everyone :-),
> >                          I am a newbie to python. I am trying to run a
> > bash script from within a python program. I would greatly appreciate
> > any pointers/comments about how to get around the problem I am facing.
> >
> > I want to run  bash script: code.sh from within a python program.
> > code.sh needs to be run like so from the command line
> > [code]
> > $ sudo code.sh arg1 arg2
> > [/code]
> >
> > I read up on some documentation but am not very clear about how to use
> > popen. I want to relegate the shell to a background process, but it
> > needs to accept the sudo passwd too!
> >
> > I have tried
> > [code]
> > p = subprocess.Popen(['/bin/bash', 'sudo '+mypath+'code.sh '+arg1+'
> > '+arg2],
> >                                     stdout=subprocess.PIPE,
> >                                     stderr=subprocess.STDOUT)
> > [/code]
> > I tried some code from stackoverflow.com/questions/694000/why-doesnt-
> > subprocess-popen-always-return
> >
> > nothing really happens when this executes, the PIPE option pshes it to
> > the background and I can't push in the sudo passwd. Can someone please
> > give me an idea of how to go about this.
> >
> > To recap, I want to run a shell script, which needs to be started with
> > sudo, and then push it into the background.
> >
> > Thanks,
> > -A
>
> Your best bet is to make sudo not ask for a password.  :)  If you
> don't have the rights, then you can use pexpect to do what you want to
> do.  http://pexpect.sourceforge.net/pexpect.html
>

Whoah there. Pexpect, yes. Making sudo not ask for a password? Only if you
tell sudo to only not ask for a password for _this_ file. Telling sudo to
not require a password at all is asking for trouble.

Also, modifying sudo to allow this script to run without a password would
require that to be done on every machine that the OP wants to run on.

OP: use pexpect.
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