add link to build's pipeline within build page header

app/helpers/gitlab_routing_helper.rb

@@ -82,6 +82,10 @@ module GitlabRoutingHelper
     namespace_project_merge_request_path(entity.project.namespace, entity.project, entity, *args)
   end
 
+  def pipeline_path(pipeline, *args)
+    namespace_project_pipeline_path(pipeline.project.namespace, pipeline.project, pipeline.id, *args)
+  end
+
   def milestone_path(entity, *args)
     namespace_project_milestone_path(entity.project.namespace, entity.project, entity, *args)
   end

app/views/projects/builds/_header.html.haml

@@ -3,6 +3,9 @@
     = ci_status_with_icon(@build.status)
     Build
     %strong ##{@build.id}
+    in pipeline
+    = link_to pipeline_path(@build.pipeline) do
+      %strong ##{@build.pipeline.id}
     for commit
     = link_to ci_status_path(@build.pipeline) do
       %strong= @build.pipeline.short_sha