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 5 package os 6 7 func 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 } 16 return contains(err.Error(), " exists") 17 } 18 19 func isNotExist(err error) bool { 20 switch pe := err.(type) { 21 case nil: 22 return false 23 case *PathError: 24 err = pe.Err 25 case *LinkError: 26 err = pe.Err 27 } 28 return contains(err.Error(), "does not exist") || contains(err.Error(), "not found") || 29 contains(err.Error(), "has been removed") || contains(err.Error(), "no parent") 30 } 31 32 func isPermission(err error) bool { 33 switch pe := err.(type) { 34 case nil: 35 return false 36 case *PathError: 37 err = pe.Err 38 case *LinkError: 39 err = pe.Err 40 } 41 return contains(err.Error(), "permission denied") 42 } 43 44 // contains is a local version of strings.Contains. It knows len(sep) > 1. 45 func contains(s, sep string) bool { 46 n := len(sep) 47 c := sep[0] 48 for i := 0; i+n <= len(s); i++ { 49 if s[i] == c && s[i:i+n] == sep { 50 return true 51 } 52 } 53 return false 54 } 55
