def migrate(self, commit_one, commit_two):
"""Migrate from one commit to another"""
parent = self.find_common_parent(commit_one, commit_two)
c1 = Commit(self)
c1.checkout(commit_one)
c2 = Commit(self)
c2.checkout(commit_two)
log = c1.rollback(parent)
log.extend(c2.rollforward(parent))
return log
