Trying to grab git info about a WordPress theme from within a plugin

Creating a WordPress plugin that will retrieve the commit info from select plugins and themes for development purposes. The goal is to have that info be copied to the clipboard once a button is clicked from the admin toolbar.

The issue I am having is grabbing the git info. I have tried getting data with exec('git rev-parse --short HEAD') but have not had any luck. Of course running git rev-parse --short HEAD from within the plugin will only show that plugins info.

Am I going about this wrong? Thanks in advanced.

via Chebli Mohamed