This is like Sandboxed Execution Environment <a href="https:&#x2F;&#x2F;github.com&#x2F;F-Secure&#x2F;see" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;F-Secure&#x2F;see</a> which was originally created for malware testing. And yes, we used guestfs.