Centralized git at Xorg

One side effect of the multiply-repo organization of Xorg is that I cannot clone a local repository without editing git_xorg.sh. In kernel, I usually have just one repository which tracks Linus (linux-2.6), then clone and blow away repositories as needed (linux-2.6-ub, linux-2.6.24-rc7, linux-2.6.23-253424). In X, git_xorg.sh has a variable on top which encodes the parent, which is not so bad. But still... Obviously they just do it differently, but how? Keith was saying something about extensive use of branches, so maybe that's it.

Also, since we're on topic, git_xorg.sh itself is not in the git. Now that's really odd, because how do I know if it's changed? I don't even remember now whence I downloaded it.

P.S. Another thing, before blowing away a repo, I would look quickly with "git diff" if anything interesting was left in it. Needless to say, this is impossible in Xorg, so it's just more evidence that they never clone anything.