There's actually a third alternative, called Git X-Modules (https://gitmodules.com https://gitmodules.com). It's a tool to release the PIA submodules are causin

There's actually a third alternative, called Git X-Modules (https://gitmodules.com https://gitmodules.com). It's a tool to release the PIA submodules are causing, as described in may comment above :-) In short, it takes all synchronization to the server's side. So you can combine repositories together in any way you like, and still work with a multi-module repository as if it was a regular one - no special commands, specific course of actions, etc.