Fix encoding issue with Repository.ls_files

lib/gitlab/gitaly_client/commit_service.rb

@@ -18,7 +18,7 @@ module Gitlab
 
         response = GitalyClient.call(@repository.storage, :commit_service, :list_files, request)
         response.flat_map do |msg|
-          msg.paths.map { |d| d.dup.force_encoding(Encoding::UTF_8) }
+          msg.paths.map { |d| EncodingHelper.encode!(d.dup) }
         end
       end
 

spec/lib/gitlab/git/repository_spec.rb

@@ -1163,6 +1163,7 @@ describe Gitlab::Git::Repository, seed_helper: true do
 
   describe "#ls_files" do
     let(:master_file_paths) { repository.ls_files("master") }
+    let(:utf8_file_paths) { repository.ls_files("ls-files-utf8") }
     let(:not_existed_branch) { repository.ls_files("not_existed_branch") }
 
     it "read every file paths of master branch" do
@@ -1184,6 +1185,10 @@ describe Gitlab::Git::Repository, seed_helper: true do
     it "returns empty array when not existed branch" do
       expect(not_existed_branch.length).to equal(0)
     end
+
+    it "returns valid utf-8 data" do
+      expect(utf8_file_paths.map { |file| file.force_encoding('utf-8') }).to all(be_valid_encoding)
+    end
   end
 
   describe "#copy_gitattributes" do