I've used this method: http://jasonkarns.com/blog/merge-two-git-repositories-into-one/ http://jasonkarns.com/blog/merge-two-git-repositories-into-o... ... in

I've used this method: http://jasonkarns.com/blog/merge-two-git-repositories-into-one/ http://jasonkarns.com/blog/merge-two-git-repositories-into-o... ... in order to manage a communication protocol library specific to two programs. Originally there was three repos (Program A, Program B and the library), that I merged into a single repository. I can merge changes from the older repositories, that are still active. It looks that this method is a close ancestor of git-subtree.