On Tue, Oct 23, 2012 at 04:39:56PM -0400, Phil Hord wrote:

> git pull --rebase does some clever tricks to find the base
> for $upstream , but it forgets that we may not have any
> branch at all.  When this happens, git merge-base reports its
> "usage" help in the middle of an otherwise successful
> rebase operation, because git-merge is called with one too
> few parameters.
> 
> Since we do not need the merge-base trick in the case of a
> detached HEAD, detect this condition and bypass the clever
> trick and the usage noise.

Makes sense. I notice there is no test with your patch. It sounds from
the description like the operation still may succeed, but we just get
cruft on stderr?

-Peff
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