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// 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
}
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