add restore method

lib/gitlab/import_export/avatar_saver.rb

@@ -16,7 +16,7 @@ module Gitlab
           shared: @shared,
           relative_export_path: 'avatar',
           from: avatar_path
-        ).copy
+        ).save
       rescue => e
         @shared.error(e)
         false

lib/gitlab/import_export/uploads_manager.rb

@@ -10,8 +10,8 @@ module Gitlab
         @from = from || default_uploads_path
       end
 
-      def copy
-        copy_files(@from, uploads_export_path) if File.directory?(@from)
+      def save
+        copy_files(@from, default_uploads_path) if File.directory?(@from)
 
         if File.file?(@from) && @relative_export_path == 'avatar'
           copy_files(@from, File.join(uploads_export_path, @project.avatar.filename))
@@ -25,6 +25,21 @@ module Gitlab
         false
       end
 
+      def restore
+        Dir["#{uploads_export_path}/**/*"].each do |upload|
+          next if File.directory?(upload)
+
+          upload_path = File.join(uploads_export_path, upload)
+
+          UploadService.new(@project, File.open(upload_path, 'r'), FileUploader).execute
+        end
+
+        true
+      rescue => e
+        @shared.error(e)
+        false
+      end
+
       private
 
       def copy_from_object_storage