User permission and executing adb from php

Question

I am trying to run adb from PHP using:

exec( 'adb devices', $output, $return_val );

but I get 126 error.

I think the problem is that php is running as 'www-data' user and does not have permissions to execute adb.

Any solutions?

Answer 1

This page shows that this error code means a permission problem or the program can not be executed.

If your program is executable (have x permission), you need to make sure it can be executed by www-data user.

If it requires super user privilege, you need to setup sudo without password for www-data to execute this command. You need to edit sudoers file using sudo visudo. Then, add a line like:

www-data ALL=NOPASSWD: /path/to/your/program

To run a command as different user, you can use the form:

sudo -u username command