Add raw trace output for GitLab Workhorse

app/controllers/projects/builds_controller.rb

 class Projects::BuildsController < Projects::ApplicationController
   before_action :build, except: [:index, :cancel_all]
   before_action :authorize_read_build!, except: [:cancel, :cancel_all, :retry]
-  before_action :authorize_update_build!, except: [:index, :show, :status]
+  before_action :authorize_update_build!, except: [:index, :show, :status, :raw_trace]
   layout 'project'
 
   def index
@@ -62,6 +62,14 @@ class Projects::BuildsController < Projects::ApplicationController
                 notice: "Build has been sucessfully erased!"
   end
 
+  def raw
+    if @build.has_trace?
+      render json: { trace_file: @build.path_to_trace }
+    else
+      render json: {}, status: 404
+    end
+  end
+
   private
 
   def build

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

@@ -127,6 +127,9 @@
                             data: { confirm: 'Are you sure you want to erase this build?' } do
                     = icon('eraser')
                     Erase
+                - if @build.has_trace?
+                  = link_to 'Raw', raw_namespace_project_build_path(@project.namespace, @project, @build),
+                            class: 'btn btn-sm btn-success', target: '_blank'
 
         .clearfix
           - if @build.duration

config/routes.rb

@@ -669,6 +669,7 @@ Rails.application.routes.draw do
             post :cancel
             post :retry
             post :erase
+            get :raw, format: false
           end
 
           resource :artifacts, only: [] do