Block renaming project or repository if it has container registry tags

app/models/namespace.rb

@@ -127,6 +127,10 @@ class Namespace < ActiveRecord::Base
     # Ensure old directory exists before moving it
     gitlab_shell.add_namespace(path_was)
 
+    if any_project_has_container_registry_tags?
+      raise Exception.new('namespace cannot be moved, because at least one project has tags in container registry')
+    end
+
     if gitlab_shell.mv_namespace(path_was, path)
       Gitlab::UploadsTransfer.new.rename_namespace(path_was, path)
 
@@ -148,6 +152,10 @@ class Namespace < ActiveRecord::Base
     end
   end
 
+  def any_project_has_container_registry_tags?
+    projects.any?(:has_container_registry_tags?)
+  end
+
   def send_update_instructions
     projects.each do |project|
       project.send_move_instructions("#{path_was}/#{project.path}")

app/models/project.rb

@@ -391,6 +391,12 @@ class Project < ActiveRecord::Base
     end
   end
 
+  def has_container_registry_tags?
+    if container_registry_enabled? && Gitlab.config.registry.enabled
+      container_registry_repository.tags.any?
+    end
+  end
+
   def commit(id = 'HEAD')
     repository.commit(id)
   end
@@ -806,6 +812,11 @@ class Project < ActiveRecord::Base
 
     expire_caches_before_rename(old_path_with_namespace)
 
+    if has_container_registry_tags?
+      # we currently doesn't support renaming repository if it contains tags in container registry
+      raise Exception.new('repository cannot be renamed, due to tags in container registry')
+    end
+
     if gitlab_shell.mv_repository(old_path_with_namespace, new_path_with_namespace)
       # If repository moved successfully we need to send update instructions to users.
       # However we cannot allow rollback since we moved repository

app/services/projects/transfer_service.rb

@@ -34,6 +34,11 @@ module Projects
           raise TransferError.new("Project with same path in target namespace already exists")
         end
 
+        if project.has_container_registry_tags?
+          # we currently doesn't support renaming repository if it contains tags in container registry
+          raise TransferError.new('Repository cannot be renamed, due to tags in container registry')
+        end
+
         project.expire_caches_before_rename(old_path)
 
         # Apply new namespace id and visibility level