Add compressed_size to both schema formats on their layers

image/docker/schema1.py

@@ -72,7 +72,8 @@ class InvalidSchema1Signature(ManifestException):
   pass
 
 
-class Schema1Layer(namedtuple('Schema1Layer', ['digest', 'v1_metadata', 'raw_v1_metadata'])):
+class Schema1Layer(namedtuple('Schema1Layer', ['digest', 'v1_metadata', 'raw_v1_metadata',
+                                               'compressed_size'])):
   """
   Represents all of the data about an individual layer in a given Manifest.
   This is the union of the fsLayers (digest) and the history entries (v1_compatibility).
@@ -319,7 +320,9 @@ class DockerSchema1Manifest(ManifestInterface):
       extracted = Schema1V1Metadata(v1_metadata['id'], v1_metadata.get('parent'),
                                     v1_metadata.get('created'), v1_metadata.get('comment'),
                                     command, labels)
-      yield Schema1Layer(image_digest, extracted, metadata_string)
+
+      compressed_size = v1_metadata.get('Size')
+      yield Schema1Layer(image_digest, extracted, metadata_string, compressed_size)
 
   @property
   def _payload(self):

image/docker/schema2/manifest.py

@@ -25,8 +25,9 @@ DOCKER_SCHEMA2_MANIFEST_URLS_KEY = 'urls'
 
 # Named tuples.
 DockerV2ManifestConfig = namedtuple('DockerV2ManifestConfig', ['size', 'digest'])
-DockerV2ManifestLayer = namedtuple('DockerV2ManifestLayer', ['index', 'size', 'digest',
-                                                             'is_remote', 'urls'])
+DockerV2ManifestLayer = namedtuple('DockerV2ManifestLayer', ['index', 'digest',
+                                                             'is_remote', 'urls',
+                                                             'compressed_size'])
 
 LayerWithV1ID = namedtuple('LayerWithV1ID', ['layer', 'v1_id', 'v1_parent_id'])
 
@@ -191,7 +192,7 @@ class DockerSchema2Manifest(ManifestInterface):
                                        layer[DOCKER_SCHEMA2_MANIFEST_DIGEST_KEY])
 
       yield DockerV2ManifestLayer(index=index,
-                                  size=layer[DOCKER_SCHEMA2_MANIFEST_SIZE_KEY],
+                                  compressed_size=layer[DOCKER_SCHEMA2_MANIFEST_SIZE_KEY],
                                   digest=digest,
                                   is_remote=is_remote,
                                   urls=layer.get(DOCKER_SCHEMA2_MANIFEST_URLS_KEY))

image/docker/schema2/test/test_manifest.py

@@ -62,13 +62,13 @@ def test_valid_manifest():
 
   assert len(manifest.layers) == 4
   assert manifest.layers[0].is_remote
-  assert manifest.layers[0].size == 1234
+  assert manifest.layers[0].compressed_size == 1234
   assert str(manifest.layers[0].digest) == 'sha256:ec4b8955958665577945c89419d1af06b5f7636b4ac3da7f12184802ad867736'
   assert manifest.layers[0].urls
 
   assert manifest.leaf_layer == manifest.layers[3]
   assert not manifest.leaf_layer.is_remote
-  assert manifest.leaf_layer.size == 73109
+  assert manifest.leaf_layer.compressed_size == 73109
 
   blob_digests = list(manifest.blob_digests)
   assert len(blob_digests) == len(manifest.layers)

image/docker/test/test_schema1.py

@@ -77,6 +77,9 @@ def test_valid_manifest():
   assert manifest.layers[1].v1_metadata.image_id == 'someid'
   assert manifest.layers[1].v1_metadata.parent_image_id == 'anotherid'
 
+  assert manifest.layers[0].compressed_size is None
+  assert manifest.layers[1].compressed_size is None
+
   assert manifest.leaf_layer == manifest.layers[1]
   assert manifest.created_datetime is None