mirror of
https://github.com/golang/go
synced 2024-11-05 19:46:11 -07:00
64 lines
1.6 KiB
Go
64 lines
1.6 KiB
Go
// Copyright 2013 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.
|
|
|
|
package vfs
|
|
|
|
import (
|
|
"fmt"
|
|
"io/ioutil"
|
|
"os"
|
|
pathpkg "path"
|
|
"path/filepath"
|
|
)
|
|
|
|
// OS returns an implementation of FileSystem reading from the
|
|
// tree rooted at root. Recording a root is convenient everywhere
|
|
// but necessary on Windows, because the slash-separated path
|
|
// passed to Open has no way to specify a drive letter. Using a root
|
|
// lets code refer to OS(`c:\`), OS(`d:\`) and so on.
|
|
func OS(root string) FileSystem {
|
|
return osFS(root)
|
|
}
|
|
|
|
type osFS string
|
|
|
|
func (root osFS) String() string { return "os(" + string(root) + ")" }
|
|
|
|
func (root osFS) resolve(path string) string {
|
|
// Clean the path so that it cannot possibly begin with ../.
|
|
// If it did, the result of filepath.Join would be outside the
|
|
// tree rooted at root. We probably won't ever see a path
|
|
// with .. in it, but be safe anyway.
|
|
path = pathpkg.Clean("/" + path)
|
|
|
|
return filepath.Join(string(root), path)
|
|
}
|
|
|
|
func (root osFS) Open(path string) (ReadSeekCloser, error) {
|
|
f, err := os.Open(root.resolve(path))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
fi, err := f.Stat()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if fi.IsDir() {
|
|
return nil, fmt.Errorf("Open: %s is a directory", path)
|
|
}
|
|
return f, nil
|
|
}
|
|
|
|
func (root osFS) Lstat(path string) (os.FileInfo, error) {
|
|
return os.Lstat(root.resolve(path))
|
|
}
|
|
|
|
func (root osFS) Stat(path string) (os.FileInfo, error) {
|
|
return os.Stat(root.resolve(path))
|
|
}
|
|
|
|
func (root osFS) ReadDir(path string) ([]os.FileInfo, error) {
|
|
return ioutil.ReadDir(root.resolve(path)) // is sorted
|
|
}
|