Run compiled python script from PHP

Question

I need to run a python script, compiled with pyinstaller via a PHP generated webpage. I tried shell_exec(), exec() and system() without success. I regularly run the script from terminal in background using:

temperature_sensor_code > /dev/null 2>&1

I've added www-data user to sudoers. I know it's not a good way but I need it in order to send killall temperature_sensor_code command (this is works).

This is my situation:

<?php

  $run = escapeshellcmd('temperature_sensor_code > /dev/null 2>&1');
  shell_exec($run);

  header("Refresh: 0; URL=index.php");
 ?>

I've made a symlink in /usr/bin, also tried with the full path of the script with no luck.

UPDATE: to make it simpler, i've created a simple sh script run.sh and put in /var/www and make it RUN with

shell_exec("/var/www/run.sh");

this is working for me. So I put my script temperature_sensor_code in /var/www but this is not working. If I add var_dump(exec("/var/www/temperature_sensor_code/temperature_sensor_code")); gives me: string(0) ""

I think there are problems with the compiled python script because the PHP side seems to be OK.

No errors to report from PHP. The python script itself works fine; basically it reads a sensor and store data in MySQL. — Luca Scalvi
– Luca Scalvi, Commented Dec 27, 2017 at 9:04

Álvaro González · Accepted Answer · 2017-12-27 16:24:40Z

1

escapeshellcmd() does this:

Escape shell metacharacters

$run = escapeshellcmd('temperature_sensor_code > /dev/null 2>&1');
var_dump($run);

string(43) "temperature_sensor_code \> /dev/null 2\>\&1"

But you have shell metacharacters that you do want to behave as shell metacharacters:

temperature_sensor_code > /dev/null 2>&1
                        ^           ^^^^

You're also doing no troubleshooting at all:

You discard all command output (that's what sending it to /dev/null does)
You don't get the return code

I suggest to:

Switch to exec() and make sure you use all its arguments and not just the mandatory ones
Get rid of > /dev/null until you diagnose the issue

answered Dec 27, 2017 at 16:24

Álvaro González

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1 Comment

Luca Scalvi Over a year ago

Your suggestions allowed me to find the real problem. Not the PHP configuration but insufficient www-data permission

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