--- a/hgext3rd/topic/__init__.py	Tue Jun 04 10:07:08 2019 +0200
+++ b/hgext3rd/topic/__init__.py	Mon May 27 03:42:35 2019 +0200
@@ -104,6 +104,12 @@
 In addition, the topic extension adds a ``--publish`` flag on :hg:`push`. When
 used, the pushed revisions are published if the push succeeds. It also applies
 to common revisions selected by the push.
+
+One can prevent any publishing to happens in a repository using::
+
+    [experimental]
+    topic.allow-publish = no
+
 """
 
 from __future__ import absolute_import
@@ -205,6 +211,9 @@
     configitem('experimental', 'topic.publish-bare-branch',
                default=False,
     )
+    configitem('experimental', 'topic.allow-publish',
+               default=configitems.dynamicdefault,
+    )
     configitem('_internal', 'keep-topic',
                default=False,
     )
@@ -496,6 +505,23 @@
                     flow.publishbarebranch(repo, tr2)
                     origclose()
                 tr.close = close
+            allow_publish = self.ui.configbool('experimental',
+                                               'topic.allow-publish',
+                                               True)
+            if not allow_publish:
+                if util.safehasattr(tr, 'validator'): # hg <= 4.7
+                    origvalidator = tr.validator
+                else:
+                    origvalidator = tr._validator
+
+                def validator(tr2):
+                    repo = reporef()
+                    flow.reject_publish(repo, tr2)
+                    return origvalidator(tr2)
+                if util.safehasattr(tr, 'validator'): # hg <= 4.7
+                    tr.validator = validator
+                else:
+                    tr._validator = validator
 
             # real transaction start
             ct = self.currenttopic