Git not working

[Phil Holmes]

I've got a set of files that goes the first way to reducing the clutter on a 
make doc build, by redirecting Lilypond output to a logfile when it's run by 
lilypond-book as part of the make process.  I want to put this on Rietveld 
for review.  However, I can't get git working through lily-git.  I've 
clicked the "Update Source" on a number of occasions, and generally the 
script just sits there with no activity.  I've tried nuking the whole 
lilypond-git directory (after saving my work elsewhere) and when I try to 
update, I either get a hang, or I get obvious network activity (about 60 
megs download) and then a load of tags added and then an error:

* [new tag]         release/2.9.7 -> release/2.9.7
* [new tag]         tarball/HEAD -> tarball/HEAD
* [new tag]         tarball/start -> tarball/start
|git --git-dir=/home/phil/lilypond-git/.git rebase origin/master 2>@1
fatal: bad revision 'HEAD'
fatal: Needed a single revision

Anyone any idea what's going on?

--
Phil Holmes
Bug Squad