update repo and wiki repo bundler to use git bundle instead of compressing via tar

app/services/projects/import_export/export_service.rb

@@ -4,8 +4,10 @@ module Projects
 
       def execute(options = {})
         @shared = Gitlab::ImportExport::Shared.new(relative_path: File.join(project.path_with_namespace, 'work'))
+        # TODO handle errors
         save_project_tree
         bundle_repo
+        bundle_wiki_repo
         save_all
       end
 
@@ -19,6 +21,10 @@ module Projects
         Gitlab::ImportExport::RepoBundler.new(project: project, shared: @shared).bundle
       end
 
+      def bundle_wiki_repo
+        Gitlab::ImportExport::WikiRepoBundler.new(project: project, shared: @shared).bundle
+      end
+
       def save_all
         Gitlab::ImportExport::Saver.save(storage_path: @shared.export_path)
       end

lib/gitlab/import_export/repo_bundler.rb

@@ -20,9 +20,8 @@ module Gitlab
 
       def bundle_to_disk
         FileUtils.mkdir_p(@export_path)
-        tar_cf(archive: full_path, dir: path_to_repo)
+        git_bundle(repo_path: path_to_repo, bundle_path: @full_path)
       rescue
-        #TODO: handle error
         false
       end
 

lib/gitlab/import_export/wiki_repo_bundler.rb

@@ -3,7 +3,7 @@ module Gitlab
     class WikiRepoBundler < RepoBundler
       def bundle
         @wiki = ProjectWiki.new(@project)
-        return false if !wiki?
+        return true if !wiki? # it's okay to have no Wiki
         @full_path = File.join(@export_path, project_filename)
         bundle_to_disk
       end
@@ -12,7 +12,6 @@ module Gitlab
         FileUtils.mkdir_p(@export_path)
         git_bundle(repo_path: path_to_repo, bundle_path: @full_path)
       rescue
-        #TODO: handle error
         false
       end