# HG changeset patch
# User Matt Mackall <mpm@selenic.com>
# Date 2012-04-07 20:43:18
# Node ID 29c2ff719715e7eafe9cf082738ed3cc731a924f
# Parent  329887a7074c8e49e73fa76712d8d45aee0d0fd7

revlog: add hasnode helper method

diff --git a/mercurial/revlog.py b/mercurial/revlog.py
--- a/mercurial/revlog.py
+++ b/mercurial/revlog.py
@@ -288,6 +288,13 @@ class revlog(object):
         self.rev(self.node(0))
         return self._nodecache
 
+    def hasnode(self, node):
+        try:
+            self.rev(node)
+            return True
+        except KeyError:
+            return False
+
     def rev(self, node):
         try:
             return self._nodecache[node]