The Plone project consists of 192 different repos: https://github.com/plone/
During development, sometimes 2 or 4 or 10 different repos will need to be touched to fix a bug or implement a feature. It would be great if all these could be branched together and merged together (e.g. a pull request closing issueX containing commits to repo1, repo2 and repo3).
Releases require the entire set of repos to be branched and tagged together.
Pre-git, a release was defined by a file listing the svn revision numbers of all the modules that make up the release. Does git give us a more streamlined way to work?
At first glance, it seems like "Superprojects" might be applicable:
you can more specifically define the relationships between the projects with tags and branches in the superprojects
http://progit.org/book/ch6-6.html#superprojects "Git/Submodules and Superprojects" seems to confirm this, but remains vague (doesn't address tags or branches). http://en.wikibooks.org/wiki/Git/Submodules_and_Superprojects
Another tool that sounds relevant is Joey Hess's mr:
The mr(1) command can checkout, update, or perform other actions on a set of repositories as if they were one combined respository.
http://kitenet.net/~joey/code/mr/ (I would be concerned that this would result in 192 different branches that happen to have the same name, instead of 1 branch that ties together all the repos.)
This question looks relevant: Is anyone really using git super/subprojects? One answer states:
our project (bitweaver, a content management system) is a highly modular system, with nearly 160 repositories - http:// github.com/bitweaver/".
That sounds like our case. It cites "severe limitations" with submodules and recommends mercurial. It sounds like mr could help to deal with those ("perform git commands to all directories in the super-repo").
I would use git submodules in an "all" repo. Also, consider "git slave" if you find work spanning many repos. That can save a lot of effort.
Why not take a look at the repo tool that's used by android ?
来源：https://stackoverflow.com/questions/8223921/using-git-for-a-project-with-many-many-repos