Make python enter password when running a csh script

Question

I'm writing a python script that executes a csh script in Solaris 10. The csh script prompts the user for the root password (which I know) but I'm not sure how to make the python script answer the prompt with the password. Is this possible? Here is what I'm using to execute the csh script:

import commands

commands.getoutput('server stop')

Answer 1

Have a look at the pexpect module. It is designed to deal with interactive programs, which seems to be your case.

Oh, and remember that hard-encoding root's password in a shell or python script is potentially a security hole :D

Answer 2

Use subprocess. Call Popen() to create your process and use communicate() to send it text. Sorry, forgot to include the PIPE..

from subprocess import Popen, PIPE

proc = Popen(['server', 'stop'], stdin=PIPE)

proc.communicate('password')

You would do better do avoid the password and try a scheme like sudo and sudoers. Pexpect, mentioned elsewhere, is not part of the standard library.

Answer 3

import pexpect
child = pexpect.spawn('server stop')
child.expect_exact('Password:')

child.sendline('password')

print "Stopping the servers..."

index = child.expect_exact(['Server processes successfully stopped.', 'Server is not running...'], 60)
child.expect(pexpect.EOF)

Did the trick! Pexpect rules!

Answer 4

Add input= in proc.communicate() make it run, for guys who like to use standard lib.

from subprocess import Popen, PIPE
proc = Popen(['server', 'stop'], stdin=PIPE)
proc.communicate(input='password')

Answer 5

Should be able to pass it as a parameter. something like:

commands.getoutput('server stop -p password')

Answer 6

This seems to work better:

import popen2

(stdout, stdin) = popen2.popen2('server stop')

stdin.write("password")

But it's not 100% yet. Even though "password" is the correct password I'm still getting su: Sorry back from the csh script when it's trying to su to root.

Answer 7

To avoid having to answer the Password question in the python script I'm just going to run the script as root. This question is still unanswered but I guess I'll just do it this way for now.