# HG changeset patch
# User Benoit Boissinot <benoit.boissinot@ens-lyon.org>
# Date 2006-07-16 23:58:59
# Node ID 6414ee2eb688249867541e2b5d674121d9192da2
# Parent  156fb1feab625490d41dba17d97cf4dc3298319f

correct the handling of linkrev with nullid

diff --git a/mercurial/revlog.py b/mercurial/revlog.py
--- a/mercurial/revlog.py
+++ b/mercurial/revlog.py
@@ -469,7 +469,8 @@ class revlog(object):
             return self.nodemap[node]
         except KeyError:
             raise RevlogError(_('%s: no node %s') % (self.indexfile, hex(node)))
-    def linkrev(self, node): return self.index[self.rev(node)][-4]
+    def linkrev(self, node):
+        return (node == nullid) and -1 or self.index[self.rev(node)][-4]
     def parents(self, node):
         if node == nullid: return (nullid, nullid)
         r = self.rev(node)