1// +build go1.8 2 3/* 4 * 5 * Copyright 2017 gRPC authors. 6 * 7 * Licensed under the Apache License, Version 2.0 (the "License"); 8 * you may not use this file except in compliance with the License. 9 * You may obtain a copy of the License at 10 * 11 * http://www.apache.org/licenses/LICENSE-2.0 12 * 13 * Unless required by applicable law or agreed to in writing, software 14 * distributed under the License is distributed on an "AS IS" BASIS, 15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 16 * See the License for the specific language governing permissions and 17 * limitations under the License. 18 * 19 */ 20 21package credentials 22 23import ( 24 "crypto/tls" 25) 26 27// cloneTLSConfig returns a shallow clone of the exported 28// fields of cfg, ignoring the unexported sync.Once, which 29// contains a mutex and must not be copied. 30// 31// If cfg is nil, a new zero tls.Config is returned. 32func cloneTLSConfig(cfg *tls.Config) *tls.Config { 33 if cfg == nil { 34 return &tls.Config{} 35 } 36 37 return cfg.Clone() 38} 39