diff --git a/hgext/mq.py b/hgext/mq.py
--- a/hgext/mq.py
+++ b/hgext/mq.py
@@ -2919,7 +2919,7 @@ def reposetup(ui, repo):
             return super(mqrepo, self).commit(text, user, date, match, force,
                                               editor, extra)
 
-        def push(self, remote, force=False, revs=None, newbranch=False):
+        def checkpush(self, force, revs):
             if self.mq.applied and not force:
                 haspatches = True
                 if revs:
@@ -2930,7 +2930,7 @@ def reposetup(ui, repo):
                     haspatches = bool([n for n in revs if n in applied])
                 if haspatches:
                     raise util.Abort(_('source has mq patches applied'))
-            return super(mqrepo, self).push(remote, force, revs, newbranch)
+            super(mqrepo, self).checkpush(force, revs)
 
         def _findtags(self):
             '''augment tags from base class with patch tags'''
diff --git a/mercurial/localrepo.py b/mercurial/localrepo.py
--- a/mercurial/localrepo.py
+++ b/mercurial/localrepo.py
@@ -1305,6 +1305,13 @@ class localrepository(repo.repository):
         finally:
             lock.release()
 
+    def checkpush(self, force, revs):
+        """Extensions can override this function if additional checks have
+        to be performed before pushing, or call it if they override push
+        command.
+        """
+        pass
+
     def push(self, remote, force=False, revs=None, newbranch=False):
         '''Push outgoing changesets (limited by revs) from the current
         repository to remote. Return an integer:
@@ -1321,6 +1328,7 @@ class localrepository(repo.repository):
         # unbundle assumes local user cannot lock remote repo (new ssh
         # servers, http servers).
 
+        self.checkpush(force, revs)
         lock = None
         unbundle = remote.capable('unbundle')
         if not unbundle: