[PATCH 3 of 8] clone: add an argument to determine if a clone should stream files

[Durham Goode]

# HG changeset patch
# User Durham Goode <durham at fb.com>
# Date 1367429921 25200
#      Wed May 01 10:38:41 2013 -0700
# Node ID e5c4416f076c1a99ea99fe83da9a009a15ca33ea
# Parent  4da152c208d0f853bd03781a5d7a9b9cc8716a19
clone: add an argument to determine if a clone should stream files

This adds an argument to wireproto.stream to specify if a streaming clone should stream
file contents. This allows an extension to prevent file contents from being
streamed.

diff --git a/mercurial/store.py b/mercurial/store.py
--- a/mercurial/store.py
+++ b/mercurial/store.py
@@ -322,13 +322,16 @@
     def datafiles(self):
         return self._walk('data', True)
 
+    def topfiles(self):
+        return reversed(self._walk('', False))
+
     def walk(self):
         '''yields (unencoded, encoded, size)'''
         # yield data files first
         for x in self.datafiles():
             yield x
         # yield manifest before changelog
-        for x in reversed(self._walk('', False)):
+        for x in self.topfiles():
             yield x
 
     def copylist(self):
diff --git a/mercurial/wireproto.py b/mercurial/wireproto.py
--- a/mercurial/wireproto.py
+++ b/mercurial/wireproto.py
@@ -523,7 +523,7 @@
 def _allowstream(ui):
     return ui.configbool('server', 'uncompressed', True, untrusted=True)
 
-def stream(repo, proto):
+def stream(repo, proto, includedatafiles=True):
     '''If the server supports streaming clone, it advertises the "stream"
     capability with a value representing the version and flags of the repo
     it is serving. Client checks to see if it understands the format.
@@ -544,7 +544,10 @@
         lock = repo.lock()
         try:
             repo.ui.debug('scanning\n')
-            for name, ename, size in repo.store.walk():
+            walkgen = repo.store.walk()
+            if not includedatafiles:
+                walkgen = repo.store.topfiles()
+            for name, ename, size in walkgen:
                 if size:
                     entries.append((name, size))
                     total_bytes += size