`current_application_settings` belongs on `Gitlab::CurrentSettings`

The initializers including this were doing so at the top level, so every object
loaded after them had a `current_application_settings` method. However, if
someone had rack-attack enabled (which was loaded before these initializers), it
would try to load the API, and fail, because `Gitlab::CurrentSettings` didn't
have that method.

To fix this:

1. Don't include `Gitlab::CurrentSettings` at the top level. We do not need
   `Object.new.current_application_settings` to work.
2. Make `Gitlab::CurrentSettings` explicitly `extend self`, as we already use it
   like that in several places.
3. Change the initializers to use that new form.

5 files changed, 9 insertions, 1 deletions

diff --git a/app/services/akismet_service.rb b/app/services/akismet_service.rb
index 7b5482b3cd1..aa6f0e841c9 100644
--- a/app/services/akismet_service.rb
+++ b/app/services/akismet_service.rb
@@ -1,4 +1,6 @@
 class AkismetService
+  include Gitlab::CurrentSettings
+
   attr_accessor :owner, :text, :options
 
   def initialize(owner, text, options = {})
diff --git a/app/services/auth/container_registry_authentication_service.rb b/app/services/auth/container_registry_authentication_service.rb
index 7dae5880931..9a636346899 100644
--- a/app/services/auth/container_registry_authentication_service.rb
+++ b/app/services/auth/container_registry_authentication_service.rb
@@ -1,6 +1,6 @@
 module Auth
   class ContainerRegistryAuthenticationService < BaseService
-    include Gitlab::CurrentSettings
+    extend Gitlab::CurrentSettings
 
     AUDIENCE = 'container_registry'.freeze
 
diff --git a/app/services/projects/update_pages_service.rb b/app/services/projects/update_pages_service.rb
index 394b336a638..f6b83a2f621 100644
--- a/app/services/projects/update_pages_service.rb
+++ b/app/services/projects/update_pages_service.rb
@@ -1,5 +1,7 @@
 module Projects
   class UpdatePagesService < BaseService
+    include Gitlab::CurrentSettings
+
     BLOCK_SIZE = 32.kilobytes
     MAX_SIZE = 1.terabyte
     SITE_PATH = 'public/'.freeze
diff --git a/app/services/upload_service.rb b/app/services/upload_service.rb
index 6c5b2baff41..76700dfcdee 100644
--- a/app/services/upload_service.rb
+++ b/app/services/upload_service.rb
@@ -1,4 +1,6 @@
 class UploadService
+  include Gitlab::CurrentSettings
+
   def initialize(model, file, uploader_class = FileUploader)
     @model, @file, @uploader_class = model, file, uploader_class
   end
diff --git a/app/services/users/build_service.rb b/app/services/users/build_service.rb
index ff234a3440f..6f05500adea 100644
--- a/app/services/users/build_service.rb
+++ b/app/services/users/build_service.rb
@@ -1,5 +1,7 @@
 module Users
   class BuildService < BaseService
+    include Gitlab::CurrentSettings
+
     def initialize(current_user, params = {})
       @current_user = current_user
       @params = params.dup