Add generated file

This PR adds generated files under pkg/client and vendor folder.

vendor/golang.org/x/tools/godoc/vfs/os.go

@@ -0,0 +1,97 @@
+// 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"
+)
+
+// 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 == runtime.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
+}