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I'm trying to make a program that allows me whenever the user want, shutdown or restart the computer. I'll send this to my friends so I don't know which operating system. I'm using tkinter too,here is an example codes;

import subprocess import os time = "10" if os.name == "posix": subprocess.call(["shutdown", "-h", time]) elif os.name == "nt": subprocess.call(["shutdown", "-s", "-t", time])

However, on linux, it's asking password to user before shutting down. So this program is useless if asking password before shutting down. I tried to use %admin ALL = NOPASSWD: /sbin/shutdown after if statement but it doesn't work either. How to pass this password thing on linux?

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  • How exactly do you want this program to be run? From the command line, or from a GUI? Why does a password prompt make the program useless? Commented Feb 16, 2015 at 15:39
  • @texasflood because this idea came from laziness :-) When I too lazy to stand up and shut down the computer, I want to set a timer. So asking password make this useless. Commented Feb 16, 2015 at 23:54
  • You could run the python program with sudo, then you only need to enter the password as soon as you run it but not when it actually shuts down. Sudo should be inherited for the children Commented Feb 17, 2015 at 1:15
  • it seems your real question is "how do I shutdown a computer without a password". "I tried to use %admin ALL = NOPASSWD: /sbin/shutdown after if statement but it doesn't work either." -- there should be no if statement, you should save this line to /etc/sudoers.d/shutdown (on Debian) or similar. Make sure the file mode is 0440 and your /etc/sudoers file contains #includedir /etc/sudoers.d at the end. Use visudo to edit it if necessary. Commented Feb 17, 2015 at 3:42

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I don' t think that's possible, you do have to disable the password or your program is like you said going to be useless. But I could be wrong ;)

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A direct call of subprocess or Popen could NOT possibly handle this, as this is an interactive to wait for the user input, you can use pexepct for this kind of interactive mode. http://pexpect.readthedocs.org/en/latest/examples.html

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it can if you use pty module but pexpect is (much) more convenient. Here's a code example that uses subprocess, pty modules and may read directly from the terminal (e.g., to read the password prompt).
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You should configure a passwordless /sbin/shutdown via your sudoers settings instead of hardcoding the password in your script.

It is not recommended but you can pass the password to sudo (based on sudo mount example):

#!/usr/bin/env python from getpass import getpass from subprocess import Popen, PIPE command = 'shutdown -P now'.split() sudo_password = getpass('Sudo password: ') p = Popen(['sudo', '--stdin'] + command, stdin=PIPE, stderr=PIPE, universal_newlines=True) sudo_prompt = p.communicate(sudo_password + '\n')[1] # should not get here print('sudo return code = {}'.format(p.returncode)) print('sudo stderr = ' + sudo_prompt)
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