push: include phase push in the unified bundle2 push

push: include phase push in the unified bundle2 push

Phase push is now included in the same bundle2 push as changesets. We use
multiple pushkey parts to transmit the information. Note that phase moves are
still not part of the repository "transaction".

--- a/mercurial/exchange.py	Wed Jul 30 19:26:47 2014 -0700
+++ b/mercurial/exchange.py	Tue Jul 01 23:08:17 2014 +0200
@@ -366,6 +366,37 @@
         pushop.ret = cgreplies['changegroup'][0]['return']
     return handlereply
 
+@b2partsgenerator('phase')
+def _pushb2phases(pushop, bundler):
+    """handle phase push through bundle2"""
+    if 'phases' in pushop.stepsdone:
+        return
+    b2caps = bundle2.bundle2caps(pushop.remote)
+    if not 'b2x:pushkey' in b2caps:
+        return
+    pushop.stepsdone.add('phases')
+    part2node = []
+    enc = pushkey.encode
+    for newremotehead in pushop.outdatedphases:
+        part = bundler.newpart('b2x:pushkey')
+        part.addparam('namespace', enc('phases'))
+        part.addparam('key', enc(newremotehead.hex()))
+        part.addparam('old', enc(str(phases.draft)))
+        part.addparam('new', enc(str(phases.public)))
+        part2node.append((part.id, newremotehead))
+    def handlereply(op):
+        for partid, node in part2node:
+            partrep = op.records.getreplies(partid)
+            results = partrep['pushkey']
+            assert len(results) <= 1
+            msg = None
+            if not results:
+                msg = _('server ignored update of %s to public!\n') % node
+            elif not int(results[0]['return']):
+                msg = _('updating %s to public failed!\n') % node
+            if msg is not None:
+                pushop.ui.warn(msg)
+    return handlereply
 
 def _pushbundle2(pushop):
     """push data to the remote using bundle2
@@ -480,13 +511,17 @@
         ### Apply local phase on remote
 
         if pushop.ret:
+            if 'phases' in pushop.stepsdone:
+                # phases already pushed though bundle2
+                return
             outdated = pushop.outdatedphases
         else:
             outdated = pushop.fallbackoutdatedphases
 
+        pushop.stepsdone.add('phases')
+
         # filter heads already turned public by the push
         outdated = [c for c in outdated if c.node() not in pheads]
-
         b2caps = bundle2.bundle2caps(pushop.remote)
         if 'b2x:pushkey' in b2caps:
             # server supports bundle2, let's do a batched push through it