Add gitlab-workhorse version to admin dashboard

CHANGELOG

@@ -164,6 +164,7 @@ v 8.10.0
   - Export and import avatar as part of project import/export
   - Fix migration corrupting import data for old version upgrades
   - Show tooltip on GitLab export link in new project page
+  - Add GitLab Workhorse version to admin dashboard (Katarzyna Kobierska)
 
 v 8.9.6
   - Fix importing of events under notes for GitLab projects. !5154

app/views/admin/dashboard/index.html.haml

@@ -80,6 +80,10 @@
           %span.pull-right
             = Gitlab::Shell.new.version
         %p
+          GitLab Workhorse
+          %span.pull-right
+            = Gitlab::Workhorse.version
+        %p
           GitLab API
           %span.pull-right
             = API::API::version

lib/gitlab/workhorse.rb

@@ -4,6 +4,7 @@ require 'json'
 module Gitlab
   class Workhorse
     SEND_DATA_HEADER = 'Gitlab-Workhorse-Send-Data'
+    VERSION_FILE = 'GITLAB_WORKHORSE_VERSION'
 
     class << self
       def git_http_ok(repository, user)
@@ -75,6 +76,12 @@ module Gitlab
         ]
       end
 
+      def version
+        if File.readable?(File.join(Rails.root, VERSION_FILE))
+          File.read(File.join(Rails.root, VERSION_FILE))
+        end
+      end
+
       protected
 
       def encode(hash)

spec/views/admin/dashboard/index.html.haml_spec.rb

+require 'spec_helper'
+
+describe 'admin/dashboard/index.html.haml' do
+  include Devise::TestHelpers
+
+  before do
+    assign(:projects, create_list(:empty_project, 1))
+    assign(:users, create_list(:user, 1))
+    assign(:groups, create_list(:group, 1))
+
+    allow(view).to receive(:admin?).and_return(true)
+  end
+
+  it "shows version of GitLab Workhorse" do
+    render
+
+    expect(rendered).to have_content 'GitLab Workhorse'
+    expect(rendered).to have_content Gitlab::Workhorse.version
+  end
+end