I used to work at a company with very draconian policies. Whenever I needed to update some code on a public GitHub repository, I would just push to a remote that was a flash drive. Plug it in my machine at home, pull from that remote, push to origin.

I also had to setup a bidirectional mirror back when bandwidth to some countries was restricted. We would push and pull as normal, and a job would keep our mainline in sync.

It is sad that most organizations forget that git is distributed by nature. We often get requests to setup VPNs and all sorts of craziness, when a simple push to a bare mirror would suffice. You don't even need anything running, other than SSH.