Simultaneous Fedora and upstream git usage

[Andy Shevchenko]

Every one who is use a git everyday knows that it has support of
joining several repositories in one local repository (especially if it
has a common base). I would use such feature for packages hosted in
git repositories.
So, the idea is to keep 2-in-1:
 - Fedora's git as a holder and main repository
 - upstream/* branches for an upstream sources (real package sources)

Advantages are in keeping things together and simplify maintaining
packages in Fedora with upstreamed patches (commits).
It also reminds the Debian's scheme where the repository contains two
branches and two kind of tags accordingly.

Any suggestions or improvements to this scheme?

-- 
With Best Regards,
Andy Shevchenko