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107 lines
2.9 KiB
107 lines
2.9 KiB
5 years ago
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// Copyright ©2015 The Go Authors
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// Copyright ©2015 Steve Francia <spf@spf13.com>
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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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package afero
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import (
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"os"
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"path/filepath"
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"sort"
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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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// adapted from https://golang.org/src/path/filepath/path.go
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func readDirNames(fs Fs, dirname string) ([]string, error) {
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f, err := fs.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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// walk recursively descends path, calling walkFn
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// adapted from https://golang.org/src/path/filepath/path.go
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func walk(fs Fs, path string, info os.FileInfo, walkFn filepath.WalkFunc) error {
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err := walkFn(path, info, nil)
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if err != nil {
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if info.IsDir() && err == filepath.SkipDir {
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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(fs, 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 := lstatIfPossible(fs, filename)
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if err != nil {
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if err := walkFn(filename, fileInfo, err); err != nil && err != filepath.SkipDir {
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return err
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}
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} else {
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err = walk(fs, filename, fileInfo, walkFn)
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if err != nil {
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if !fileInfo.IsDir() || err != filepath.SkipDir {
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return err
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}
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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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// if the filesystem supports it, use Lstat, else use fs.Stat
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func lstatIfPossible(fs Fs, path string) (os.FileInfo, error) {
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if lfs, ok := fs.(Lstater); ok {
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fi, _, err := lfs.LstatIfPossible(path)
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return fi, err
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}
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return fs.Stat(path)
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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. All errors that arise visiting files
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// and directories are filtered by walkFn. The files are walked in lexical
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// order, which makes the output deterministic but means that for very
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// large directories Walk can be inefficient.
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// Walk does not follow symbolic links.
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func (a Afero) Walk(root string, walkFn filepath.WalkFunc) error {
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return Walk(a.Fs, root, walkFn)
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}
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func Walk(fs Fs, root string, walkFn filepath.WalkFunc) error {
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info, err := lstatIfPossible(fs, 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(fs, root, info, walkFn)
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}
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