# Solution found here: http://stackoverflow.com/questions/134882/undoing-a-git-rebase

# The easiest way would be to find the head commit of the branch as it was immediately before the rebase started in the reflog...
git reflog
# and to reset the current branch to it (with the usual caveats about being absolutely sure before reseting with the --hard option).

# Suppose the old commit was HEAD@{5} in the ref log
git reset --hard HEAD@{5}