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 return checkErrMessageContent(err, "exists", "is a directory") 9 } 10 11 func isNotExist(err error) bool { 12 return checkErrMessageContent(err, "does not exist", "not found", 13 "has been removed", "no parent") 14 } 15 16 func isPermission(err error) bool { 17 return checkErrMessageContent(err, "permission denied") 18 } 19 20 // checkErrMessageContent checks if err message contains one of msgs. 21 func checkErrMessageContent(err error, msgs ...string) bool { 22 if err == nil { 23 return false 24 } 25 err = underlyingError(err) 26 for _, msg := range msgs { 27 if contains(err.Error(), msg) { 28 return true 29 } 30 } 31 return false 32 } 33 34 // contains is a local version of strings.Contains. It knows len(sep) > 1. 35 func contains(s, sep string) bool { 36 n := len(sep) 37 c := sep[0] 38 for i := 0; i+n <= len(s); i++ { 39 if s[i] == c && s[i:i+n] == sep { 40 return true 41 } 42 } 43 return false 44 } 45
