github.com/bazelbuild/bazel-gazelle@v0.36.1-0.20240520142334-61b277ba6fed/cmd/fetch_repo/copy_tree.go (about)

     1  /* Copyright 2019 The Bazel Authors. All rights reserved.
     2  
     3  Licensed under the Apache License, Version 2.0 (the "License");
     4  you may not use this file except in compliance with the License.
     5  You may obtain a copy of the License at
     6  
     7     http://www.apache.org/licenses/LICENSE-2.0
     8  
     9  Unless required by applicable law or agreed to in writing, software
    10  distributed under the License is distributed on an "AS IS" BASIS,
    11  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  See the License for the specific language governing permissions and
    13  limitations under the License.
    14  */
    15  
    16  package main
    17  
    18  import (
    19  	"io"
    20  	"os"
    21  	"path/filepath"
    22  )
    23  
    24  func copyTree(destRoot, srcRoot string) error {
    25  	return filepath.Walk(srcRoot, func(src string, info os.FileInfo, e error) (err error) {
    26  		if e != nil {
    27  			return e
    28  		}
    29  		rel, err := filepath.Rel(srcRoot, src)
    30  		if err != nil {
    31  			return err
    32  		}
    33  		if rel == "." {
    34  			return nil
    35  		}
    36  		dest := filepath.Join(destRoot, rel)
    37  
    38  		if info.IsDir() {
    39  			return os.Mkdir(dest, 0o777)
    40  		}
    41  
    42  		r, err := os.Open(src)
    43  		if err != nil {
    44  			return err
    45  		}
    46  		defer r.Close()
    47  		w, err := os.Create(dest)
    48  		if err != nil {
    49  			return err
    50  		}
    51  		defer func() {
    52  			if cerr := w.Close(); err == nil && cerr != nil {
    53  				err = cerr
    54  			}
    55  		}()
    56  		_, err = io.Copy(w, r)
    57  		return err
    58  	})
    59  }