Reliable way for custom script to know how it was executed?

[llamafilm]

Most of my custom scripts, start by logging the username and IP address like this:

    username = self.request.user.username
    ip_address = self.request.META.get('HTTP_X_FORWARDED_FOR') or \
        self.request.META.get('REMOTE_ADDR')
    self.log_info(f"Running as user {username} (IP: {ip_address})...")

But if the script is triggered by CLI, it seems to pick a random username, I don't know why. And the META dict is empty. If I add a test for if META = {} is that a reliable way to know it's run by CLI, or are there other things which could cause that?