Fix pulling of squashed versions of the legacy image in a manifest lists

data/registry_model/test/test_blobuploader.py

@@ -1,5 +1,6 @@
 import hashlib
 import os
+import tarfile
 
 from io import BytesIO
 
@@ -113,3 +114,36 @@ def test_extra_blob_stream_handlers(pre_oci_model):
 
   assert ''.join(handler1_result) == 'hello world'
   assert ''.join(handler2_result) == 'hello world'
+
+
+def valid_tar_gz(contents):
+  layer_data = BytesIO()
+  tar_file = tarfile.open(fileobj=layer_data, mode='w|gz')
+
+  tar_file_info = tarfile.TarInfo(name='somefile')
+  tar_file_info.type = tarfile.REGTYPE
+  tar_file_info.size = len(contents)
+  tar_file_info.mtime = 1
+
+  tar_file.addfile(tar_file_info, BytesIO(contents))
+  tar_file.close()
+
+  layer_bytes = layer_data.getvalue()
+  layer_data.close()
+  return layer_bytes
+
+
+def test_uncompressed_size(pre_oci_model):
+  repository_ref = pre_oci_model.lookup_repository('devtable', 'complex')
+  storage = DistributedStorage({'local_us': FakeStorage(None)}, ['local_us'])
+  settings = BlobUploadSettings('1K', 512 * 1024, 3600)
+  app_config = {'TESTING': True}
+
+  with upload_blob(repository_ref, storage, settings) as manager:
+    manager.upload_chunk(app_config, BytesIO(valid_tar_gz('hello world')))
+
+    blob = manager.commit_to_blob(app_config)
+
+  assert blob.compressed_size is not None
+  assert blob.uncompressed_size is not None
+