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This command will first add an alias known only to git, which will allow you to pull a remote and first-forward the current branch. However, if the remote/branch and your branch have diverged, it will stop before actually trying to merge the two, so you can back out the changes.
http://www.kernel.org/pub/software/scm/git/docs/git-pull.html
Tested on git 1.5.6.1, msysgit (Windows port)
Actually this is not really the way I want it. I want it to attempt a fast-foward, but not attempt to merge or change my working copy. Unfortunately git pull doesn't have that functionality (yet?).
There is 1 alternative - vote for the best!
If you can do better, submit your command here.
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I think what you actually want here is
git pull --ff-only
sadly it's not available yet, but will be soon:
http://kerneltrap.org/index.php?q=mailarchive/git/2009/1/30/4853834
Cool, thanks for the heads up. Now there's a reason to upgrade git!