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// Copyright 2024 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build (js && wasm) || plan9
package os
import (
"errors"
"sync/atomic"
)
// root implementation for platforms with no openat.
// Currently plan9 and js.
type root struct {
name string
closed atomic.Bool
}
// openRootNolog is OpenRoot.
func openRootNolog(name string) (*Root, error) {
r, err := newRoot(name)
if err != nil {
return nil, &PathError{Op: "open", Path: name, Err: err}
}
return r, nil
}
// openRootInRoot is Root.OpenRoot.
func openRootInRoot(r *Root, name string) (*Root, error) {
if err := checkPathEscapes(r, name); err != nil {
return nil, &PathError{Op: "openat", Path: name, Err: err}
}
r, err := newRoot(joinPath(r.root.name, name))
if err != nil {
return nil, &PathError{Op: "openat", Path: name, Err: err}
}
return r, nil
}
// newRoot returns a new Root.
// If fd is not a directory, it closes it and returns an error.
func newRoot(name string) (*Root, error) {
fi, err := Stat(name)
if err != nil {
return nil, err.(*PathError).Err
}
if !fi.IsDir() {
return nil, errors.New("not a directory")
}
return &Root{&root{name: name}}, nil
}
func (r *root) Close() error {
// For consistency with platforms where Root.Close closes a handle,
// mark the Root as closed and return errors from future calls.
r.closed.Store(true)
return nil
}
func (r *root) Name() string {
return r.name
}
// rootOpenFileNolog is Root.OpenFile.
func rootOpenFileNolog(r *Root, name string, flag int, perm FileMode) (*File, error) {
if err := checkPathEscapes(r, name); err != nil {
return nil, &PathError{Op: "openat", Path: name, Err: err}
}
f, err := openFileNolog(joinPath(r.root.name, name), flag, perm)
if err != nil {
return nil, &PathError{Op: "openat", Path: name, Err: underlyingError(err)}
}
return f, nil
}
func rootStat(r *Root, name string, lstat bool) (FileInfo, error) {
var fi FileInfo
var err error
if lstat {
err = checkPathEscapesLstat(r, name)
if err == nil {
fi, err = Lstat(joinPath(r.root.name, name))
}
} else {
err = checkPathEscapes(r, name)
if err == nil {
fi, err = Stat(joinPath(r.root.name, name))
}
}
if err != nil {
return nil, &PathError{Op: "statat", Path: name, Err: underlyingError(err)}
}
return fi, nil
}
func rootMkdir(r *Root, name string, perm FileMode) error {
if err := checkPathEscapes(r, name); err != nil {
return &PathError{Op: "mkdirat", Path: name, Err: err}
}
if err := Mkdir(joinPath(r.root.name, name), perm); err != nil {
return &PathError{Op: "mkdirat", Path: name, Err: underlyingError(err)}
}
return nil
}
func rootRemove(r *Root, name string) error {
if err := checkPathEscapesLstat(r, name); err != nil {
return &PathError{Op: "removeat", Path: name, Err: err}
}
if err := Remove(joinPath(r.root.name, name)); err != nil {
return &PathError{Op: "removeat", Path: name, Err: underlyingError(err)}
}
return nil
}
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