exchange: don't attempt phase exchange if phase-heads was in bundle

The Mercurial core server doesn't yet include phase-heads parts in the
bundle, but our Google-internal server wants to do
that. Unfortunately, the usual exchange still happens even if
phase-heads part is included (including the short-circuited one for
old/publishing servers). That means that even if our server (again,
the Google-internal one, but also future Mercurial core servers)
includes a phase-heads part to indicate that some heads should be
drafts, that would still get overwritten by the phase updating that
happens after. So let's fix that by marking the phase step done if we
receive at least one phase-heads part in the bundle.

Differential Revision: https://phab.mercurial-scm.org/D440

mercurial/bundle2.py

@@ -1815,6 +1815,7 b' def handlephases(op, inpart):'
     """apply phases from bundle part to repo"""
     headsbyphase = _readphaseheads(inpart)
     phases.updatephases(op.repo.unfiltered(), op.gettransaction(), headsbyphase)
+    op.records.add('phase-heads', {})
 
 @parthandler('reply:pushkey', ('return', 'in-reply-to'))
 def handlepushkeyreply(op, inpart):

mercurial/exchange.py

@@ -1401,6 +1401,10 b' def _pullbundle2(pullop):'
     if pullop.fetch:
         pullop.cgresult = bundle2.combinechangegroupresults(op)
 
+    # If the bundle had a phase-heads part, then phase exchange is already done
+    if op.records['phase-heads']:
+        pullop.stepsdone.add('phases')
+
     # processing phases change
     for namespace, value in op.records['listkeys']:
         if namespace == 'phases':