hgext/rebase.py

--- a/hgext/rebase.py	Thu Mar 30 03:50:10 2017 -0700
+++ b/hgext/rebase.py	Thu Mar 30 03:50:10 2017 -0700
@@ -1362,6 +1362,11 @@
     'Call rebase after pull if the latter has been invoked with --rebase'
     ret = None
     if opts.get('rebase'):
+        if ui.configbool('commands', 'rebase.requiredest'):
+            msg = _('rebase destination required by configuration')
+            hint = _('use hg pull followed by hg rebase -d DEST')
+            raise error.Abort(msg, hint=hint)
+
         wlock = lock = None
         try:
             wlock = repo.wlock()