mirror of
https://github.com/golang/go
synced 2024-11-18 11:24:41 -07:00
b776bcbf45
GOROOT is not a function, so use "is" instead of "returns". This was originally raised during review of golang.org/cl/131315. Also add a missing period. Change-Id: Ie28d38529889702ae5035d0f48d8122b6bee6819 Reviewed-on: https://go-review.googlesource.com/131316 Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
106 lines
2.7 KiB
Go
106 lines
2.7 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"
|
|
"go/build"
|
|
"io/ioutil"
|
|
"os"
|
|
pathpkg "path"
|
|
"path/filepath"
|
|
"runtime"
|
|
)
|
|
|
|
// We expose a new variable because otherwise we need to copy the findGOROOT logic again
|
|
// from cmd/godoc which is already copied twice from the standard library.
|
|
|
|
// GOROOT is the GOROOT path under which the godoc binary is running.
|
|
// It is needed to check whether a filesystem root is under GOROOT or not.
|
|
// This is set from cmd/godoc/main.go.
|
|
var GOROOT = runtime.GOROOT()
|
|
|
|
// 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 {
|
|
var t RootType
|
|
switch {
|
|
case root == GOROOT:
|
|
t = RootTypeGoRoot
|
|
case isGoPath(root):
|
|
t = RootTypeGoPath
|
|
}
|
|
return osFS{rootPath: root, rootType: t}
|
|
}
|
|
|
|
type osFS struct {
|
|
rootPath string
|
|
rootType RootType
|
|
}
|
|
|
|
func isGoPath(path string) bool {
|
|
for _, bp := range filepath.SplitList(build.Default.GOPATH) {
|
|
for _, gp := range filepath.SplitList(path) {
|
|
if bp == gp {
|
|
return true
|
|
}
|
|
}
|
|
}
|
|
return false
|
|
}
|
|
|
|
func (root osFS) String() string { return "os(" + root.rootPath + ")" }
|
|
|
|
// RootType returns the root type for the filesystem.
|
|
//
|
|
// Note that we ignore the path argument because roottype is a property of
|
|
// this filesystem. But for other filesystems, the roottype might need to be
|
|
// dynamically deduced at call time.
|
|
func (root osFS) RootType(path string) RootType {
|
|
return root.rootType
|
|
}
|
|
|
|
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(root.rootPath, 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) {
|
|
return ioutil.ReadDir(root.resolve(path)) // is sorted
|
|
}
|