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I am trying to get the output of a command. For now I'm just trying a simple "ls /home/." 

$output = shell_exec("sudo -u myusername ssh remote_server ls /home/");

echo json_encode($output);

This is being called from an Ajax call, and when I log the data returned, I get "null." In /var/log/apache2/error.log, I'm getting:

  sudo: no tty present and no askpass program specified

Since the php script is going to run as www-data, I have this in my sudoers file: 

www-data ALL= NOPASSWD:/var/www/path/to/the/file.php

What am I doing wrong? I just need to return data from a command on a remote server as www-data.

I tried appending '2>&1' to the command as this answer suggested, but that did not work. However, it did change my console output from

null

to

sudo: no tty present and no askpass program specified
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1 Answers1

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I created an RSA key pair for www-data, and put my id_rsa.pub on the remote machine. That fixed it.

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