Serve static pages

app/models/ci/build.rb

@@ -104,6 +104,12 @@ module Ci
           build.update_coverage
         end
       end
+
+      after_transition any => :success do |build, transition|
+        if build.name == 'pages' && build.artifact_file?
+          PagesUpdaterWorker.perform_async(build.id)
+        end
+      end
     end
     def ignored?

app/workers/pages_updater_worker.rb

+class PagesUpdaterWorker
+  include Sidekiq::Worker
+
+  sidekiq_options queue: :pages
+
+  def perform(build_id)
+    @build_id = build_id
+    return unless valid?
+
+    FileUtils.mkdir_p(tmp_path)
+
+    Dir.mktmpdir(nil, tmp_path) do |dir|
+      cmd = %W(tar -zxf #{build.artifact_file.path} -C #{dir})
+      return unless system(*cmd)
+      return unless valid?
+
+      public_dir = File.join(dir, 'public')
+      return unless File.exists?(public_dir)
+
+      FileUtils.mkdir_p(pages_path)
+      if File.exists?(pages_path)
+        FileUtils.move(pages_path, old_pages_path)
+      end
+      FileUtils.move(public_dir, pages_path)
+      FileUtils.rm_r(old_pages_path)
+    end
+  end
+
+  private
+
+  def valid?
+    # check if ref is still recent one
+    build && build.artifact_file? && build.sha == gl_project.commit.sha
+  end
+
+  def build
+    @build ||= Ci::Build.find(@build_id)
+  end
+
+  def gl_project
+    @gl_project ||= build.gl_project
+  end
+
+  def tmp_path
+    @tmp_path ||= File.join(Settings.gitlab_ci.pages_path, 'tmp')
+  end
+
+  def pages_path
+    @pages_path ||= File.join(Settings.gitlab_ci.pages_path, gl_project.path_with_namespace)
+  end
+
+  def old_pages_path
+    @old_pages_path ||= File.expand_path("#{pages_path}.#{SecureRandom.hex}")
+  end
+end

config/initializers/1_settings.rb

@@ -186,6 +186,7 @@ Settings.gitlab_ci['add_pusher']          = false if Settings.gitlab_ci['add_pus
 Settings.gitlab_ci['url']                 ||= Settings.send(:build_gitlab_ci_url)
 Settings.gitlab_ci['builds_path']         = File.expand_path(Settings.gitlab_ci['builds_path'] || "builds/", Rails.root)
 Settings.gitlab_ci['artifacts_path']      = File.expand_path('shared/artifacts/', Rails.root)
+Settings.gitlab_ci['pages_path']          = File.expand_path('shared/pages/', Rails.root)
 Settings.gitlab_ci['max_artifact_size']   ||= 100

lib/ci/gitlab_ci_yaml_processor.rb

@@ -20,6 +20,7 @@ module Ci
       @config = @config.deep_symbolize_keys
       initial_parsing
+      inject_pages
       validate!
     end
@@ -38,6 +39,20 @@ module Ci
       @stages || DEFAULT_STAGES
     end
+    def inject_pages
+      return unless stages.include?('deploy')
+      return if @jobs.include?('pages')
+
+      @jobs['pages'] = {
+        stage: 'deploy',
+        image: 'jekyll/jekyll:builder',
+        script: 'jekyll build --destination public',
+        artifacts: [
+          'public/',
+        ]
+      }
+    end
+
     private
     def initial_parsing