Merge pull request #4860 from masters-of-cats/pr-process-not-found-err

Return GRPC not found error instead of plain one

container_linux_test.go

@@ -1178,6 +1178,10 @@ func TestContainerLoadUnexistingProcess(t *testing.T) {
 		t.Fatal("an error should have occurred when loading a process that does not exist")
 	}
 
+	if !errdefs.IsNotFound(err) {
+		t.Fatalf("an error of type NotFound should have been returned when loading a process that does not exist, got %#v instead ", err)
+	}
+
 	if err := task.Kill(ctx, syscall.SIGKILL); err != nil {
 		t.Error(err)
 	}

runtime/v2/runc/v2/service.go

@@ -483,7 +483,7 @@ func (s *service) State(ctx context.Context, r *taskAPI.StateRequest) (*taskAPI.
 	}
 	p, err := container.Process(r.ExecID)
 	if err != nil {
-		return nil, err
+		return nil, errdefs.ToGRPC(err)
 	}
 	st, err := p.Status(ctx)
 	if err != nil {