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  }