Python calling subprocess of a bash script in sudo

Question

I'm running a python script on my rPi. I have to run it in sudo to use the rpi.gpio library, but when I do, it won't let me run my bash script in non-sudo. This causes my ssh commands to prompt for passwords, even though the key-gen authentication is set.

I'm sure I'm missing something simple. Can anyone help?

Running python script:

sudo python ./runcam.py

In the py script I'm running this:

subprocess.call("./runit", shell=True)

And my ssh script:

#!/bin/bash

      FNAME=`date +'%H-%M-%S-%m%d%Y'`

      ssh [email protected] '
        mkdir $FNAME
      ' & 

      ssh [email protected] '
        mkdir $FNAME
      ' &

Could you change your command to subprocess.call("sudo ./runit", shell=True)? — SethMMorton
– SethMMorton, Commented Dec 6, 2013 at 2:19

lunixbochs · Accepted Answer · 2013-12-06 02:26:39Z

1

You can also drop your root permissions with sudo. You just need to check for user id 0, and the environment variable "SUDO_USER", then sudo -u "$SUDO_USER" command.

You can do it in your bash script like this:

# if we're root from sudo, run this script as the original user instead
[[ "$(id -u)" = "0" && -n "${SUDO_USER:-}" ]] && exec sudo -u "$SUDO_USER" "$0" "$@"

Full script example:

#!/bin/bash -u
[[ "$(id -u)" = "0" && -n "${SUDO_USER:-}" ]] && exec sudo -u "$SUDO_USER" "$0" "$@"
id -u

This script will print your user id, regardless of whether it's run with sudo.

edited Dec 6, 2013 at 2:26

answered Dec 6, 2013 at 2:21

lunixbochs

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