67 lines
1.3 KiB
Go
67 lines
1.3 KiB
Go
// Copyright 2012 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build !windows
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package walk
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import (
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"bytes"
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"errors"
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"os"
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"strings"
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)
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func evalSymlinks(path string) (string, error) {
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const maxIter = 255
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originalPath := path
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// consume path by taking each frontmost path element,
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// expanding it if it's a symlink, and appending it to b
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var b bytes.Buffer
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for n := 0; path != ""; n++ {
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if n > maxIter {
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return "", errors.New("EvalSymlinks: too many links in " + originalPath)
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}
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// find next path component, p
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i := strings.IndexRune(path, Separator)
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var p string
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if i == -1 {
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p, path = path, ""
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} else {
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p, path = path[:i], path[i+1:]
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}
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if p == "" {
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if b.Len() == 0 {
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// must be absolute path
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b.WriteRune(Separator)
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}
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continue
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}
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fi, err := os.Lstat(b.String() + p)
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if err != nil {
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return "", err
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}
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if fi.Mode()&os.ModeSymlink == 0 {
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b.WriteString(p)
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if path != "" {
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b.WriteRune(Separator)
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}
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continue
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}
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// it's a symlink, put it at the front of path
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dest, err := os.Readlink(b.String() + p)
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if err != nil {
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return "", err
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}
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if IsAbs(dest) {
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b.Reset()
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}
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path = dest + string(Separator) + path
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}
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return Clean(b.String()), nil
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}
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