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// 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 {
f.Close()
return nil, err
}
if fi.IsDir() {
f.Close()
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) {
dirName := root.resolve(path)
fis, err := ioutil.ReadDir(dirName) // is sorted
if err != nil {
return nil, err
}
// Replace symlinks with what they are pointing to
for i, fi := range fis {
if fi.Mode()&os.ModeSymlink != 0 {
fi, err = os.Stat(filepath.Join(dirName, fi.Name()))
if err != nil {
return nil, err
}
}
fis[i] = fi
}
return fis, nil
}
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