--- a/mercurial/dirstate.py+++ b/mercurial/dirstate.py@@ -213,6 +213,8 @@ class dirstate(object): self.markdirty() def write(self):+ if not self.dirty:+ return st = self.opener("dirstate", "w", atomic=True) st.write("".join(self.pl)) for f, e in self.map.items():