When speaking to version 0.2-beta of the build worker, properly lookup the cached commands and see if we have a matching image/tag in the repository

data/model/legacy.py

@@ -1089,6 +1089,25 @@ def get_repository(namespace_name, repository_name):
     return None
 
 
+def get_image(repo, dockerfile_id):
+  try:
+    return Image.get(Image.docker_image_id == dockerfile_id, Image.repository == repo)
+  except Image.DoesNotExist:
+    return None
+
+
+def find_child_image(repo, parent_image, command):
+  try:
+    return (Image.select()
+                .join(ImageStorage)
+                .switch(Image)
+                .where(Image.ancestors % '%/' + parent_image.id + '/%',
+                       ImageStorage.command == command)
+                .get())
+  except Image.DoesNotExist:
+    return None
+
+
 def get_repo_image(namespace_name, repository_name, docker_image_id):
   def limit_to_image_id(query):
     return query.where(Image.docker_image_id == docker_image_id).limit(1)
@@ -1645,7 +1664,6 @@ def get_tag_image(namespace_name, repository_name, tag_name):
   else:
     return images[0]
 
-
 def get_image_by_id(namespace_name, repository_name, docker_image_id):
   image = get_repo_image_extended(namespace_name, repository_name, docker_image_id)
   if not image: