125 lines
3.4 KiB
Go
125 lines
3.4 KiB
Go
/*
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Copyright (c) for portions of walk.go are held by The Go Authors, 2009 and are
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provided under the BSD license.
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https://github.com/golang/go/blob/master/LICENSE
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Copyright The Helm Authors.
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Copyright The Flux authors
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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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http://www.apache.org/licenses/LICENSE-2.0
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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 sympath
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import (
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"fmt"
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"io/fs"
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"os"
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"path/filepath"
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"sort"
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)
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// AbsWalkFunc functions like filepath.WalkFunc but provides the absolute path
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// of fs.FileInfo when path is a symlink.
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type AbsWalkFunc func(path, absPath string, info fs.FileInfo, err error) error
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// Walk walks the file tree rooted at root, calling walkFn for each file or directory
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// in the tree, including root. All errors that arise visiting files and directories
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// are filtered by walkFn. The files are walked in lexical order, which makes the
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// output deterministic but means that for very large directories Walk can be
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// inefficient. Walk follows symbolic links.
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func Walk(root string, walkFn AbsWalkFunc) error {
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info, err := os.Lstat(root)
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if err != nil {
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err = walkFn(root, root, nil, err)
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} else {
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err = symwalk(root, root, info, walkFn)
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}
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if 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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// 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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// symwalk recursively descends path, calling AbsWalkFunc.
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func symwalk(path, absPath string, info os.FileInfo, walkFn AbsWalkFunc) error {
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// Recursively walk symlinked directories.
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if IsSymlink(info) {
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resolved, err := filepath.EvalSymlinks(path)
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if err != nil {
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return fmt.Errorf("error evaluating symlink %s: %w", path, err)
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}
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if info, err = os.Lstat(resolved); err != nil {
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return err
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}
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// NB: pass-on resolved as absolute path
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if err := symwalk(path, resolved, info, walkFn); err != nil && err != filepath.SkipDir {
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return err
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}
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return nil
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}
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if err := walkFn(path, absPath, info, nil); err != nil {
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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, absPath, 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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// NB: possibly absPath != path separately
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absFilename := filepath.Join(absPath, 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, absFilename, 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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if err = symwalk(filename, absFilename, fileInfo, walkFn); err != nil {
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if (!fileInfo.IsDir() && !IsSymlink(fileInfo)) || 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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// IsSymlink is used to determine if the fileinfo is a symbolic link.
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func IsSymlink(fi os.FileInfo) bool {
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return fi.Mode()&os.ModeSymlink != 0
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}
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