It is something that I prefer to have in a VCS. At one end of the spectrum you treat a repository as a object which a containing repository can subclass with sp

It is something that I prefer to have in a VCS. At one end of the spectrum you treat a repository as a object which a containing repository can subclass with specific changes. Such a system would allow things like basic driver frameworks for a bunch of devices to be in their own repository and the 'critical bits' that make them work in a system of type 'x' would end up being a that repository + changes. You can kind of do this with git where you create a branch for each system x, y, and z in the repository and then your submodule is driver repo branch x but that doesn't put the maintenance burden in the right place (the system X maintainer).