# HG changeset patch
# User Pierre-Yves David <pierre-yves.david@fb.com>
# Date 2014-07-05 17:32:20
# Node ID 24bb01f42e820986b75de507504a9c1ea4e1da19
# Parent  5f57bc77657cd0fdf9aa53a4e8a9d2db7a21e6be

push: introduce a discovery step for obsmarker

The discovery step is still not doing anything smart. But this will allow
extension to wrap it.

diff --git a/mercurial/exchange.py b/mercurial/exchange.py
--- a/mercurial/exchange.py
+++ b/mercurial/exchange.py
@@ -82,7 +82,7 @@ class pushoperation(object):
         # phases changes that must be pushed if changeset push fails
         self.fallbackoutdatedphases = None
         # outgoing obsmarkers
-        self.outobsmarkers = repo.obsstore
+        self.outobsmarkers = set()
 
     @util.propertycache
     def futureheads(self):
@@ -278,6 +278,10 @@ def _pushdiscoveryphase(pushop):
     pushop.outdatedphases = future
     pushop.fallbackoutdatedphases = fallback
 
+@pushdiscovery('obsmarker')
+def _pushdiscoveryobsmarkers(pushop):
+    pushop.outobsmarkers = pushop.repo.obsstore
+
 def _pushcheckoutgoing(pushop):
     outgoing = pushop.outgoing
     unfi = pushop.repo.unfiltered()