Encode paths properly for Gitaly Commit{Diff,Delta}

Fixes gitaly#589

lib/gitlab/gitaly_client/commit_service.rb

@@ -221,7 +221,7 @@ module Gitlab
           repository: @gitaly_repo,
           left_commit_id: parent_id,
           right_commit_id: commit.id,
-          paths: options.fetch(:paths, [])
+          paths: options.fetch(:paths, []).map { |path| GitalyClient.encode(path) }
         }
       end
 

spec/lib/gitlab/gitaly_client/commit_service_spec.rb

@@ -51,6 +51,10 @@ describe Gitlab::GitalyClient::CommitService do
 
       expect(ret).to be_kind_of(Gitlab::GitalyClient::DiffStitcher)
     end
+
+    it 'encodes paths correctly' do
+      expect { client.diff_from_parent(commit, paths: ['encoding/test.txt', 'encoding/テスト.txt']) }.not_to raise_error
+    end
   end
 
   describe '#commit_deltas' do