1// Copyright 2011 The Go Authors. All rights reserved. 2// Use of this source code is governed by a BSD-style 3// license that can be found in the LICENSE file. 4 5package os 6 7func isExist(err error) bool { 8 switch pe := err.(type) { 9 case nil: 10 return false 11 case *PathError: 12 err = pe.Err 13 case *LinkError: 14 err = pe.Err 15 case *SyscallError: 16 err = pe.Err 17 } 18 return contains(err.Error(), " exists") 19} 20 21func isNotExist(err error) bool { 22 switch pe := err.(type) { 23 case nil: 24 return false 25 case *PathError: 26 err = pe.Err 27 case *LinkError: 28 err = pe.Err 29 case *SyscallError: 30 err = pe.Err 31 } 32 return contains(err.Error(), "does not exist") || contains(err.Error(), "not found") || 33 contains(err.Error(), "has been removed") || contains(err.Error(), "no parent") 34} 35 36func isPermission(err error) bool { 37 switch pe := err.(type) { 38 case nil: 39 return false 40 case *PathError: 41 err = pe.Err 42 case *LinkError: 43 err = pe.Err 44 case *SyscallError: 45 err = pe.Err 46 } 47 return contains(err.Error(), "permission denied") 48} 49 50// contains is a local version of strings.Contains. It knows len(sep) > 1. 51func contains(s, sep string) bool { 52 n := len(sep) 53 c := sep[0] 54 for i := 0; i+n <= len(s); i++ { 55 if s[i] == c && s[i:i+n] == sep { 56 return true 57 } 58 } 59 return false 60} 61