Add a script to backfill the sizes of existing images.

tools/backfillsizes.py

@@ -0,0 +1,16 @@
+from data.database import Image
+from app import app
+
+
+store = app.config['STORAGE']
+
+
+for image in Image.select():
+  if image.image_size == None:
+    image_path = store.image_layer_path(image.repository.namespace,
+                                        image.repository.name,
+                                        image.docker_image_id)
+    size = store.get_size(image_path)
+    print 'Setting image %s size to: %s' % (image.docker_image_id, size)
+    image.image_size = size
+    image.save()