--- a/mercurial/bundle2.py	Thu Apr 17 11:32:30 2014 -0400
+++ b/mercurial/bundle2.py	Thu Apr 17 11:44:49 2014 -0400
@@ -344,7 +344,7 @@
         self.ui = ui
         self._params = []
         self._parts = []
-        self.capabilities = set(capabilities)
+        self.capabilities = dict(capabilities)
 
     def addparam(self, name, value=None):
         """add a stream level parameter"""
@@ -697,8 +697,22 @@
 def handlereplycaps(op, inpart):
     """Notify that a reply bundle should be created
 
-    the part payload is a list of capabilities (one per line)"""
-    caps = [c for c in inpart.read().splitlines() if c]
+    The part payload is a list of capabilities (one per line)
+    Capabilities may have values using a line of form::
+
+        capability=value1,value2,value3
+
+    The value are alway a list."""
+    caps = {}
+    for line in inpart.read().splitlines():
+        if not line:
+            continue
+        if '=' not in line:
+            key, vals = line, ()
+        else:
+            key, vals = line.split('=', 1)
+            vals = vals.split(',')
+        caps[key] = vals
     if op.reply is None:
         op.reply = bundle20(op.ui, caps)
 

--- a/tests/test-bundle2.t	Thu Apr 17 11:32:30 2014 -0400
+++ b/tests/test-bundle2.t	Thu Apr 17 11:44:49 2014 -0400
@@ -51,6 +51,9 @@
   >         op.ui.write('debugreply: capabilities:\n')
   >         for cap in sorted(op.reply.capabilities):
   >             op.ui.write('debugreply:     %r\n' % cap)
+  >             for val in op.reply.capabilities[cap]:
+  >                 op.ui.write('debugreply:         %r\n' % val)
+  > 
   > @command('bundle2',
   >          [('', 'param', [], 'stream level parameter'),
   >           ('', 'unknown', False, 'include an unknown mandatory part in the bundle'),
@@ -69,7 +72,7 @@
   >             raise util.Abort('%s' % exc)
   > 
   >     if opts['reply']:
-  >         capsstring = 'ping-pong\nelephants'
+  >         capsstring = 'ping-pong\nelephants=babar,celeste\ncity=celesteville'
   >         bundler.addpart(bundle2.bundlepart('replycaps', data=capsstring))
   > 
   >     revs = opts['rev']
@@ -544,8 +547,12 @@
       Patali Dirapata, Cromda Cromda Ripalo, Pata Pata, Ko Ko Ko
       Bokoro Dipoulito, Rondi Rondi Pepino, Pata Pata, Ko Ko Ko
       Emana Karassoli, Loucra Loucra Ponponto, Pata Pata, Ko Ko Ko.
-  \x00\x00\x00\x00\x00\x1b\x06output\x00\x00\x00\x01\x00\x01\x0b\x01in-reply-to4\x00\x00\x00Rdebugreply: capabilities: (esc)
+  \x00\x00\x00\x00\x00\x1b\x06output\x00\x00\x00\x01\x00\x01\x0b\x01in-reply-to4\x00\x00\x00\xc6debugreply: capabilities: (esc)
+  debugreply:     'city'
+  debugreply:         'celesteville'
   debugreply:     'elephants'
+  debugreply:         'babar'
+  debugreply:         'celeste'
   debugreply:     'ping-pong'
   \x00\x00\x00\x00\x00\x1e	test:pong\x00\x00\x00\x02\x01\x00\x0b\x01in-reply-to6\x00\x00\x00\x00\x00\x1b\x06output\x00\x00\x00\x03\x00\x01\x0b\x01in-reply-to6\x00\x00\x00=received ping request (id 6) (esc)
   replying to ping request (id 6)
@@ -562,7 +569,7 @@
     :output:
       mandatory: 0
       advisory: 1
-      payload: 82 bytes
+      payload: 198 bytes
     :test:pong:
       mandatory: 1
       advisory: 0
@@ -581,7 +588,11 @@
   remote:     Bokoro Dipoulito, Rondi Rondi Pepino, Pata Pata, Ko Ko Ko
   remote:     Emana Karassoli, Loucra Loucra Ponponto, Pata Pata, Ko Ko Ko.
   remote: debugreply: capabilities:
+  remote: debugreply:     'city'
+  remote: debugreply:         'celesteville'
   remote: debugreply:     'elephants'
+  remote: debugreply:         'babar'
+  remote: debugreply:         'celeste'
   remote: debugreply:     'ping-pong'
   remote: received ping request (id 6)
   remote: replying to ping request (id 6)