Add schema2 list support

image/docker/schema2/manifest.py

@@ -3,7 +3,6 @@ import logging
 import hashlib
 
 from collections import namedtuple
-
 from jsonschema import validate as validate_schema, ValidationError
 
 from digest import digest_tools
@@ -133,6 +132,10 @@ class DockerSchema2Manifest(object):
     except ValidationError as ve:
       raise MalformedSchema2Manifest('manifest data does not match schema: %s' % ve)
 
+  @property
+  def schema_version(self):
+    return 2
+
   @property
   def config(self):
     config = self._parsed[DOCKER_SCHEMA2_MANIFEST_CONFIG_KEY]
@@ -160,7 +163,7 @@ class DockerSchema2Manifest(object):
       except digest_tools.InvalidDigestException:
         raise MalformedSchema2Manifest('could not parse manifest digest: %s' %
                                        layer[DOCKER_SCHEMA2_MANIFEST_DIGEST_KEY])
-        
+
       yield DockerV2ManifestLayer(index=index,
                                   size=layer[DOCKER_SCHEMA2_MANIFEST_SIZE_KEY],
                                   digest=digest,
@@ -192,6 +195,10 @@ class DockerSchema2Manifest(object):
         digest SHA, returns the associated configuration JSON bytes for this schema.
     """
     config_bytes = lookup_config_fn(self.config.digest)
+    if len(config_bytes) != self.config.size:
+      raise MalformedSchema2Manifest('Size of config does not match that retrieved: %s vs %s',
+                                     len(config_bytes), self.config.size)
+
     schema2_config = DockerSchema2Config(config_bytes)
 
     # Build the V1 IDs for the layers.