Fixes grack authentification under relative_url_root

Ref: https://github.com/gitlabhq/gitlabhq/commit/e6159b8725f99af78f446f8d33fa0e52b7780430
Ref: https://github.com/gitlabhq/gitlabhq/pull/3204
Ref: https://github.com/gitlabhq/gitlabhq/issues/1228

Add Rails' variable in application.rb to support relative url

This variable is used by assets compilation and other modules.

Note that user needs to change application.rb too

Restrict session cookie to the relative path if set.

Ref: https://github.com/gitlabhq/gitlabhq/commit/2c2f1e31856a4decdae469974f5bea8245316f7e

Fix Update attachment_uploader.rb bug with relative URL

See: https://github.com/gitlabhq/gitlabhq/commit/161afda3fa4fca58f396e9c3acbd72bc14490ace

Fix Wall relative bug with attachement files (javascript)

app/assets/javascripts/wall.js.coffee

@@ -64,7 +64,7 @@ class Wall
     template = template.replace('{{text}}', simpleFormat(note.body))
 
     if note.attachment
-      file = '<i class="icon-paper-clip"/><a href="/files/note/' + note.id + '/' + note.attachment + '">' + note.attachment + '</a>'
+      file = '<i class="icon-paper-clip"/><a href="' + gon.relative_url_root + '/files/note/' + note.id + '/' + note.attachment + '">' + note.attachment + '</a>'
     else
       file = ''
     template = template.replace('{{file}}', file)

app/uploaders/attachment_uploader.rb

@@ -21,7 +21,7 @@ class AttachmentUploader < CarrierWave::Uploader::Base
   end
 
   def secure_url
-    "/files/#{model.class.to_s.underscore}/#{model.id}/#{file.filename}"
+    Gitlab.config.gitlab.relative_url_root + "/files/#{model.class.to_s.underscore}/#{model.id}/#{file.filename}"
   end
 
   def file_storage?

config/application.rb

@@ -67,5 +67,9 @@ module Gitlab
 
     # Version of your assets, change this if you want to expire all your assets
     config.assets.version = '1.0'
+    
+    # Uncomment this if you are using a subdirectory
+    # Note that ENV['RAILS_RELATIVE_URL_ROOT'] in config/puma.rb may need to be changed
+    # config.relative_url_root = "/gitlab"
   end
 end

config/gitlab.yml.example

@@ -21,6 +21,7 @@ production: &base
     # WARNING: This feature is no longer supported
     # Uncomment and customize to run in non-root path
     # Note that ENV['RAILS_RELATIVE_URL_ROOT'] in config/puma.rb may need to be changed
+    # You need to uncomment config.relative_url_root in config/application.rb
     # relative_url_root: /gitlab
 
     # Uncomment and customize if you can't use the default user to run GitLab (default: 'git')

config/initializers/session_store.rb

@@ -2,7 +2,8 @@
 
 Gitlab::Application.config.session_store :cookie_store, key: '_gitlab_session',
                                                       secure: Gitlab::Application.config.force_ssl,
-                                                      httponly: true
+                                                      httponly: true,
+                                                      path: (Rails.application.config.relative_url_root.nil?) ? '/' : Rails.application.config.relative_url_root
 
 # Use the database for sessions instead of the cookie-based default,
 # which shouldn't be used to store highly confidential information

lib/gitlab/backend/grack_auth.rb

@@ -15,7 +15,15 @@ module Grack
       @auth = Request.new(env)
 
       # Need this patch due to the rails mount
+      
+      # Need this if under RELATIVE_URL_ROOT
+      unless Gitlab.config.gitlab.relative_url_root.empty?
+        # If website is mounted using relative_url_root need to remove it first
+        @env['PATH_INFO'] = @request.path.sub(Gitlab.config.gitlab.relative_url_root,'')
+      else
         @env['PATH_INFO'] = @request.path
+      end
+      
       @env['SCRIPT_NAME'] = ""
 
       auth!