github.com/cloudfoundry/libcfbuildpack@v1.91.23/helper/write_symlink.go (about) 1 /* 2 * Copyright 2018-2020 the original author or authors. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * https://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package helper 18 19 import ( 20 "fmt" 21 "os" 22 "path/filepath" 23 ) 24 25 // WriteSymlink creates newName as a symbolic link to oldName. Before writing, it creates all required parent 26 // directories for the newName. 27 func WriteSymlink(oldName string, newName string) error { 28 if err := os.MkdirAll(filepath.Dir(newName), 0755); err != nil { 29 return err 30 } 31 32 if err := os.Symlink(oldName, newName); err != nil { 33 return fmt.Errorf("error while creating '%s' as symlink to '%s': %v", newName, oldName, err) 34 } 35 36 return nil 37 }