Add generated file

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

vendor/golang.org/x/tools/cmd/getgo/download.go

@@ -0,0 +1,184 @@
+// Copyright 2017 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.
+
+// +build !plan9
+
+package main
+
+import (
+	"archive/tar"
+	"archive/zip"
+	"compress/gzip"
+	"crypto/sha256"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"net/http"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+const (
+	currentVersionURL = "https://golang.org/VERSION?m=text"
+	downloadURLPrefix = "https://dl.google.com/go"
+)
+
+// downloadGoVersion downloads and upacks the specific go version to dest/go.
+func downloadGoVersion(version, ops, arch, dest string) error {
+	suffix := "tar.gz"
+	if ops == "windows" {
+		suffix = "zip"
+	}
+	uri := fmt.Sprintf("%s/%s.%s-%s.%s", downloadURLPrefix, version, ops, arch, suffix)
+
+	verbosef("Downloading %s", uri)
+
+	req, err := http.NewRequest("GET", uri, nil)
+	if err != nil {
+		return err
+	}
+	req.Header.Add("User-Agent", fmt.Sprintf("golang.org-getgo/%s", version))
+
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return fmt.Errorf("Downloading Go from %s failed: %v", uri, err)
+	}
+	if resp.StatusCode > 299 {
+		return fmt.Errorf("Downloading Go from %s failed with HTTP status %s", uri, resp.Status)
+	}
+	defer resp.Body.Close()
+
+	tmpf, err := ioutil.TempFile("", "go")
+	if err != nil {
+		return err
+	}
+	defer os.Remove(tmpf.Name())
+
+	h := sha256.New()
+
+	w := io.MultiWriter(tmpf, h)
+	if _, err := io.Copy(w, resp.Body); err != nil {
+		return err
+	}
+
+	verbosef("Downloading SHA %s.sha256", uri)
+
+	sresp, err := http.Get(uri + ".sha256")
+	if err != nil {
+		return fmt.Errorf("Downloading Go sha256 from %s.sha256 failed: %v", uri, err)
+	}
+	defer sresp.Body.Close()
+	if sresp.StatusCode > 299 {
+		return fmt.Errorf("Downloading Go sha256 from %s.sha256 failed with HTTP status %s", uri, sresp.Status)
+	}
+
+	shasum, err := ioutil.ReadAll(sresp.Body)
+	if err != nil {
+		return err
+	}
+
+	// Check the shasum.
+	sum := fmt.Sprintf("%x", h.Sum(nil))
+	if sum != string(shasum) {
+		return fmt.Errorf("Shasum mismatch %s vs. %s", sum, string(shasum))
+	}
+
+	unpackFunc := unpackTar
+	if ops == "windows" {
+		unpackFunc = unpackZip
+	}
+	if err := unpackFunc(tmpf.Name(), dest); err != nil {
+		return fmt.Errorf("Unpacking Go to %s failed: %v", dest, err)
+	}
+	return nil
+}
+
+func unpack(dest, name string, fi os.FileInfo, r io.Reader) error {
+	if strings.HasPrefix(name, "go/") {
+		name = name[len("go/"):]
+	}
+
+	path := filepath.Join(dest, name)
+	if fi.IsDir() {
+		return os.MkdirAll(path, fi.Mode())
+	}
+
+	f, err := os.OpenFile(path, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, fi.Mode())
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	_, err = io.Copy(f, r)
+	return err
+}
+
+func unpackTar(src, dest string) error {
+	r, err := os.Open(src)
+	if err != nil {
+		return err
+	}
+	defer r.Close()
+
+	archive, err := gzip.NewReader(r)
+	if err != nil {
+		return err
+	}
+	defer archive.Close()
+
+	tarReader := tar.NewReader(archive)
+
+	for {
+		header, err := tarReader.Next()
+		if err == io.EOF {
+			break
+		} else if err != nil {
+			return err
+		}
+
+		if err := unpack(dest, header.Name, header.FileInfo(), tarReader); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func unpackZip(src, dest string) error {
+	zr, err := zip.OpenReader(src)
+	if err != nil {
+		return err
+	}
+
+	for _, f := range zr.File {
+		fr, err := f.Open()
+		if err != nil {
+			return err
+		}
+		if err := unpack(dest, f.Name, f.FileInfo(), fr); err != nil {
+			return err
+		}
+		fr.Close()
+	}
+
+	return nil
+}
+
+func getLatestGoVersion() (string, error) {
+	resp, err := http.Get(currentVersionURL)
+	if err != nil {
+		return "", fmt.Errorf("Getting current Go version failed: %v", err)
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode > 299 {
+		b, _ := ioutil.ReadAll(io.LimitReader(resp.Body, 1024))
+		return "", fmt.Errorf("Could not get current Go version: HTTP %d: %q", resp.StatusCode, b)
+	}
+	version, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return "", err
+	}
+	return strings.TrimSpace(string(version)), nil
+}