How to configure rebar3 to fetch dependencies from another host?

I have an app which uses rebar3, eg cowboy.

My question is: how can I easily configure it to fetch cowboy from another host? I would like to switch from github.com to my own host.

You want to build cowboy that has two dependencies which are git repositories on GitHub (https://github.com/ninenines/cowlib and https://github.com/ninenines/ranch to be specific). But you want to fetch the repositories from some other host, like your company's own git server where you mirrored all public repositories you need.

You have a number of options:

• Fork cowboy and change the dependency URL-s in the rebar.config. This is the only (sane) way I know to make Rebar3 fetch the dependencies from a different location. The other options will target the layers below Rebar3 to achieve the same result.
• Configure git to rewrite GitHub URL-s to URL-s on your server, following e.g. https://stackoverflow.com/a/11383587/9015322

git config --global url.https://git.mycompany.com/.insteadOf https://github.com/

• Add an /etc/hosts entry that resolves github.com to the IP of your server. You'll probably have to create a fake self-signed certificate for github.com, and make git on the build machine trust it. But you can do that following the advice here: https://stackoverflow.com/a/16543283/9015322