Fix disable upload object storage

- Fix specs for import export task
- Replace File.exists with File.exist

lib/gitlab/import_export/project/base_task.rb

@@ -27,10 +27,8 @@ module Gitlab
         end
 
         def disable_upload_object_storage
-          overwrite_uploads_setting('background_upload', false) do
-            overwrite_uploads_setting('direct_upload', false) do
-              yield
-            end
+          overwrite_uploads_setting('enabled', false) do
+            yield
           end
         end
 

spec/lib/gitlab/import_export/project/export_task_spec.rb

@@ -30,7 +30,7 @@ describe Gitlab::ImportExport::Project::ExportTask do
     around do |example|
       example.run
     ensure
-      File.delete(file_path) if File.exists?(file_path)
+      File.delete(file_path) if File.exist?(file_path)
     end
 
     include_context 'rake task object storage shared context'

spec/support/shared_contexts/lib/gitlab/import_export/project/rake_task_object_storage_shared_context.rb

@@ -6,15 +6,12 @@ RSpec.shared_context 'rake task object storage shared context' do
   end
 
   around do |example|
-    old_direct_upload_setting     = Settings.uploads.object_store['direct_upload']
-    old_background_upload_setting = Settings.uploads.object_store['background_upload']
+    old_object_store_setting = Settings.uploads.object_store['enabled']
 
-    Settings.uploads.object_store['direct_upload']     = true
-    Settings.uploads.object_store['background_upload'] = true
+    Settings.uploads.object_store['enabled'] = true
 
     example.run
 
-    Settings.uploads.object_store['direct_upload']     = old_direct_upload_setting
-    Settings.uploads.object_store['background_upload'] = old_background_upload_setting
+    Settings.uploads.object_store['enabled'] = old_object_store_setting
   end
 end

spec/support/shared_examples/lib/gitlab/import_export/project/rake_task_object_storage_shared_examples.rb

@@ -4,18 +4,15 @@ RSpec.shared_examples 'rake task with disabled object_storage' do |service_class
   it 'disables direct & background upload only for service call' do
     expect_next_instance_of(service_class) do |service|
       expect(service).to receive(:execute).and_wrap_original do |m|
-        expect(Settings.uploads.object_store['background_upload']).to eq(false)
-        expect(Settings.uploads.object_store['direct_upload']).to eq(false)
+        expect(Settings.uploads.object_store['enabled']).to eq(false)
 
         m.call
       end
     end
 
     expect(rake_task).to receive(method).and_wrap_original do |m, *args|
-      expect(Settings.uploads.object_store['background_upload']).to eq(true)
-      expect(Settings.uploads.object_store['direct_upload']).to eq(true)
-      expect(Settings.uploads.object_store).not_to receive(:[]=).with('backgroud_upload', false)
-      expect(Settings.uploads.object_store).not_to receive(:[]=).with('direct_upload', false)
+      expect(Settings.uploads.object_store['enabled']).to eq(true)
+      expect(Settings.uploads.object_store).not_to receive(:[]=).with('enabled', false)
 
       m.call(*args)
     end