--- a/mercurial/revlog.py+++ b/mercurial/revlog.py@@ -500,6 +500,8 @@ class revlog(object): def size(self, rev): """return the length of the uncompressed text for a given revision"""+ if rev == nullrev:+ return 0 l = -1 if self.version != REVLOGV0: l = self.index[rev][2]