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108 lines
3.0 KiB
108 lines
3.0 KiB
/*
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* Minio Cloud Storage, (C) 2015 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package fs
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import (
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"errors"
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"os"
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"path/filepath"
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"sort"
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)
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// Walk walks the file tree rooted at root, calling walkFn for each file or
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// directory in the tree, including root.
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func Walk(root string, walkFn WalkFunc) error {
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info, err := os.Lstat(root)
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if err != nil {
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return walkFn(root, nil, err)
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}
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return walk(root, info, walkFn)
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}
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// readDirNames reads the directory named by dirname and returns
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// a sorted list of directory entries.
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func readDirNames(dirname string) ([]string, error) {
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f, err := os.Open(dirname)
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if err != nil {
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return nil, err
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}
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names, err := f.Readdirnames(-1)
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f.Close()
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if err != nil {
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return nil, err
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}
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sort.Strings(names)
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return names, nil
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}
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// WalkFunc is the type of the function called for each file or directory
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// visited by Walk. The path argument contains the argument to Walk as a
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// prefix; that is, if Walk is called with "dir", which is a directory
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// containing the file "a", the walk function will be called with argument
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// "dir/a". The info argument is the os.FileInfo for the named path.
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type WalkFunc func(path string, info os.FileInfo, err error) error
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// ErrSkipDir is used as a return value from WalkFuncs to indicate that
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// the directory named in the call is to be skipped. It is not returned
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// as an error by any function.
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var ErrSkipDir = errors.New("skip this directory")
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// ErrSkipFile is used as a return value from WalkFuncs to indicate that
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// the file named in the call is to be skipped. It is not returned
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// as an error by any function.
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var ErrSkipFile = errors.New("skip this file")
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// walk recursively descends path, calling w.
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func walk(path string, info os.FileInfo, walkFn WalkFunc) error {
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err := walkFn(path, info, nil)
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if err != nil {
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if info.Mode().IsDir() && err == ErrSkipDir {
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return nil
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}
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if info.Mode().IsRegular() && err == ErrSkipFile {
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return nil
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}
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return err
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}
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if !info.IsDir() {
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return nil
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}
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names, err := readDirNames(path)
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if err != nil {
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return walkFn(path, info, err)
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}
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for _, name := range names {
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filename := filepath.Join(path, name)
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fileInfo, err := os.Lstat(filename)
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if err != nil {
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if err := walkFn(filename, fileInfo, err); err != nil && err != ErrSkipDir && err != ErrSkipFile {
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return err
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}
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} else {
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err = walk(filename, fileInfo, walkFn)
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if err != nil {
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if err == ErrSkipDir || err == ErrSkipFile {
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return nil
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}
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return err
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}
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}
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}
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return nil
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}
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