Start building abstraction over pipeline seeds

lib/gitlab/ci/pipeline/seed/base.rb

+module Gitlab
+  module Ci
+    module Pipeline
+      module Seed
+        class Base
+          def attributes
+            raise NotImplementedError
+          end
+
+          def excluded?
+            raise NotImplementedError
+          end
+        end
+      end
+    end
+  end
+end

lib/gitlab/ci/stage/seed.rb → lib/gitlab/ci/pipeline/seed/stage.rb

 module Gitlab
   module Ci
-    module Stage
-      class Seed
+    module Pipeline
+      module Seed
+        class Stage < Seed::Base
           include ::Gitlab::Utils::StrongMemoize
 
           attr_reader :pipeline
@@ -63,4 +64,5 @@ module Gitlab
         end
       end
     end
+  end
 end

lib/gitlab/ci/yaml_processor.rb

@@ -73,7 +73,8 @@ module Gitlab
         seeds = @stages.uniq.map do |stage|
           builds = pipeline_stage_builds(stage, pipeline)
 
-          Gitlab::Ci::Stage::Seed.new(pipeline, stage, builds) if builds.any?
+          Gitlab::Ci::Pipeline::Seed::Stage
+            .new(pipeline, stage, builds) if builds.any?
         end
 
         seeds.compact

spec/lib/gitlab/ci/stage/seed_spec.rb → spec/lib/gitlab/ci/pipeline/seed/stage_spec.rb

 require 'spec_helper'
 
-describe Gitlab::Ci::Stage::Seed do
+describe Gitlab::Ci::Pipeline::Seed::Stage do
   let(:pipeline) { create(:ci_empty_pipeline) }
 
   let(:builds) do

spec/models/ci/pipeline_spec.rb

@@ -247,7 +247,8 @@ describe Ci::Pipeline, :mailer do
       end
 
       it 'returns preseeded stage seeds object' do
-        expect(pipeline.stage_seeds).to all(be_a Gitlab::Ci::Stage::Seed)
+        expect(pipeline.stage_seeds)
+          .to all(be_a Gitlab::Ci::Pipeline::Seed::Base)
         expect(pipeline.stage_seeds.count).to eq 1
       end
     end