Add note about performance, update NEWS.

NEWS

@@ -21,6 +21,9 @@
 
   * Fix inconsistent handling of trailing slashes for DictRefsContainer. (#383)
 
+  * Add hack to support thin packs duing fetch(), albeit while requiring the
+    entire pack file to be loaded into memory. (jsbain)
+
  CHANGES
 
   * This will be the last release to support Python 2.6.

dulwich/client.py

@@ -234,6 +234,8 @@ class GitClient(object):
         if determine_wants is None:
             determine_wants = target.object_store.determine_wants_all
         if CAPABILITY_THIN_PACK in self._fetch_capabilities:
+           # TODO(jelmer): Avoid reading entire file into memory and
+           # only processing it after the whole file has been fetched.
            f = BytesIO()
            def commit():
               if f.tell():