[PATCH 2 of 3 V3] schemas: add schemas listkeys implementation

[Durham Goode]

# HG changeset patch
# User Durham Goode <durham at fb.com>
# Date 1375827497 25200
#      Tue Aug 06 15:18:17 2013 -0700
# Node ID d43e79e852d560c9990aa2ac2de878c73e9b88ad
# Parent  84ac4b920802805474d203b5b5dc1cd4aa861256
schemas: add schemas listkeys implementation

This adds the wire protocol logic for requesting and transmitting
schema data. It is transmitted via the existing listkeys protocol,
but schemas cannot be pushed to the server.

diff --git a/mercurial/pushkey.py b/mercurial/pushkey.py
--- a/mercurial/pushkey.py
+++ b/mercurial/pushkey.py
@@ -19,6 +19,7 @@
                "bookmarks": (bookmarks.pushbookmark, bookmarks.listbookmarks),
                "phases": (phases.pushphase, phases.listphases),
                "obsolete": (obsolete.pushmarker, obsolete.listmarkers),
+               "schemas": (lambda *x: False, lambda repo: repo.schemas),
               }
 
 def register(namespace, pushkey, listkeys):
diff --git a/tests/test-bookmarks-pushpull.t b/tests/test-bookmarks-pushpull.t
--- a/tests/test-bookmarks-pushpull.t
+++ b/tests/test-bookmarks-pushpull.t
@@ -54,6 +54,7 @@
   namespaces	
   obsolete	
   phases	
+  schemas	
   $ hg debugpushkey ../a bookmarks
   X	4e3505fd95835d721066b76e75dbb8cc554d7f77
   Y	4e3505fd95835d721066b76e75dbb8cc554d7f77
@@ -340,6 +341,7 @@
   namespaces	
   obsolete	
   phases	
+  schemas	
   $ hg debugpushkey http://localhost:$HGPORT/ bookmarks
   @	9b140be1080824d768c5a4691a564088eede71f9
   X	9b140be1080824d768c5a4691a564088eede71f9
diff --git a/tests/test-ssh.t b/tests/test-ssh.t
--- a/tests/test-ssh.t
+++ b/tests/test-ssh.t
@@ -167,6 +167,7 @@
   bookmarks	
   namespaces	
   phases	
+  schemas	
   $ hg book foo -r 0
   $ hg out -B
   comparing with ssh://user@dummy/remote