Add artifacts metadata uploader filed

Artifacts metadata field will be used to store a filename of gzipped
file containing metadata definition for given artifacts archive.

app/controllers/projects/artifacts_controller.rb

@@ -18,7 +18,7 @@ class Projects::ArtifactsController < Projects::ApplicationController
     return render_404 unless build.artifacts?
 
     current_path = params[:path] ? "./#{params[:path]}/" : './'
-    artifacts_metadata = build.artifacts_metadata(current_path)
+    artifacts_metadata = build.artifacts_metadata_for(current_path)
     @path = Gitlab::StringPath.new(current_path, artifacts_metadata)
   end
 

app/models/ci/build.rb

@@ -30,6 +30,7 @@
 #  description        :string(255)
 #  artifacts_file     :text
 #  gl_project_id      :integer
+#  artifacts_metadata :text
 #
 
 module Ci
@@ -50,6 +51,7 @@ module Ci
     scope :similar, ->(build) { where(ref: build.ref, tag: build.tag, trigger_request_id: build.trigger_request_id) }
 
     mount_uploader :artifacts_file, ArtifactUploader
+    mount_uploader :artifacts_metadata, ArtifactUploader
 
     acts_as_taggable
 
@@ -344,11 +346,11 @@ module Ci
     def artifacts_browser_supported?
       # TODO, since carrierwave 0.10.0 we will be able to check mime type here
       #
-      artifacts? && artifacts_file.path.end_with?('zip')
+      artifacts? && artifacts_file.path.end_with?('zip') && artifacts_metadata.exists?
     end
 
-    def artifacts_metadata(path)
-      []
+    def artifacts_metadata_for(path)
+      {}
     end
 
     private

db/migrate/20151230132518_add_artifacts_metadata_to_ci_build.rb

+class AddArtifactsMetadataToCiBuild < ActiveRecord::Migration
+  def change
+    add_column :ci_builds, :artifacts_metadata, :text
+  end
+end

db/schema.rb

@@ -123,6 +123,7 @@ ActiveRecord::Schema.define(version: 20160113111034) do
     t.string   "description"
     t.text     "artifacts_file"
     t.integer  "gl_project_id"
+    t.text     "artifacts_metadata"
   end
 
   add_index "ci_builds", ["commit_id", "stage_idx", "created_at"], name: "index_ci_builds_on_commit_id_and_stage_idx_and_created_at", using: :btree