How to execute set of commands after sudo using python script

Question

I am trying to automate deployment process using the python. In deployment I do "dzdo su - sysid" first and then perform the deployment process. But I am not able to handle this part in python. I have done similar thing in shell where I used following piece of code,

/bin/bash

psh su - sysid  << EOF

. /users/home/sysid/.bashrc

./deployment.sh

EOF

this handles execution of deployment.sh very well. It does the sudo and then execute the script with sysid id. I am trying to do similar thing using python but I am not able to find any alternative to << EOF in python.

I am using subprocess.Popen to execute dzdo part, it does the dzdo, but when I try to execute next command for e.g. say "ls -l", then this command will not get executed with the sysid, instead, i had to exit from sysid session and as soon as i exit, it will execute "ls -l" in my home directory which is of no use. Can someone please help me on this?

And one more thing, in this case I am not calling any deployment.sh but I will call commands like cp, rm, mkdir etc.

BlackJack · Accepted Answer · 2016-08-31 16:10:11Z

1

The text between << EOF and EOF in your shell script example will be written to the standard input of the psh process. So you have to redirect the standard input of your Popen instance and write the data either directly into the stdin file of your instance or use the communicate() method:

#!/usr/bin/env python
# coding: utf8
from __future__ import absolute_import, division, print_function
from subprocess import Popen, PIPE

SHELL_COMMANDS = r'''\
. /users/home/sysid/.bashrc
./deployment.sh
'''


def main():
    process = Popen(['psh', 'su', '-', 'sysid'], stdin=PIPE)
    process.communicate(SHELL_COMMANDS)


if __name__ == '__main__':
    main()

If you need the output of the process' stdandard output and/or error then you need to pipe those too and work with the return value of the communicate() call.

answered Aug 31, 2016 at 16:10

BlackJack

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2 Comments

Kalpesh Over a year ago

Thank you so much BlackJack. The solution you provided is worked. Just tell me one more thing, how to use shell variables in shell commands. For e.g. SHELL_COMMANDS=r'''\ . /users/home/$USER/deployment.py ''' In this, you can see I am trying to pass $USER, a shell variable in path. But of course python is not able to expand this variable. Could you please tell me if i can use shell variable here?

BlackJack Over a year ago

As it is executed by a shell that shouldn't be a problem at all.

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