--- a/mercurial/localrepo.py	Wed Feb 15 10:40:15 2006 -0800
+++ b/mercurial/localrepo.py	Wed Feb 15 10:49:30 2006 -0800
@@ -1342,6 +1342,9 @@
 
         if not source:
             return
+
+        self.hook('prechangegroup', throw=True)
+
         changesets = files = revisions = 0
 
         tr = self.transaction()
@@ -1384,6 +1387,9 @@
                          " with %d changes to %d files%s\n")
                          % (changesets, revisions, files, heads))
 
+        self.hook('pretxnchangegroup', throw=True,
+                  node=hex(self.changelog.node(cor+1)))
+
         tr.close()
 
         if changesets > 0: