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in china dl.google.com is not available, add flag -m to use china ustc mirror #9

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in china dl.google.com is not available, add flag -m to use china ustc mirror #9

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30 changes: 24 additions & 6 deletions internal/version/version.go
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,7 @@ import (
"compress/gzip"
"crypto/sha256"
"errors"
"flag"
"fmt"
"io"
"io/ioutil"
Expand Down Expand Up @@ -41,8 +42,12 @@ func Run(version string) {
log.Fatalf("%s: %v", version, err)
}

if len(os.Args) == 2 && os.Args[1] == "download" {
if err := install(root, version); err != nil {
if len(os.Args) >= 2 && os.Args[1] == "download" {
flagset := flag.NewFlagSet("download", flag.ExitOnError)
mirror := flagset.String("m", "google", "download mirror: ['google','ustc]")
flagset.Parse(os.Args[2:])

if err := install(root, version, *mirror); err != nil {
log.Fatalf("%s: download failed: %v", version, err)
}
os.Exit(0)
Expand Down Expand Up @@ -100,7 +105,7 @@ func fmtSize(size int64) string {

// install installs a version of Go to the named target directory, creating the
// directory as needed.
func install(targetDir, version string) error {
func install(targetDir, version, mirror string) error {
if _, err := os.Stat(filepath.Join(targetDir, unpackedOkay)); err == nil {
log.Printf("%s: already downloaded in %v", version, targetDir)
return nil
Expand All @@ -109,7 +114,8 @@ func install(targetDir, version string) error {
if err := os.MkdirAll(targetDir, 0755); err != nil {
return err
}
goURL := versionArchiveURL(version)
goURL := versionArchiveURL(version, mirror)
fmt.Printf("download from %s\n", goURL)
res, err := http.Head(goURL)
if err != nil {
return err
Expand Down Expand Up @@ -417,8 +423,20 @@ func getOS() string {
return runtime.GOOS
}

// getMirrors return the download url by mirror
func getMirrors(mirror string) string {
switch mirror {
case "ustc":
return "https://mirrors.ustc.edu.cn/golang/"
case "google":
fallthrough
default:
return "https://dl.google.com/go/"
}
}

// versionArchiveURL returns the zip or tar.gz URL of the given Go version.
func versionArchiveURL(version string) string {
func versionArchiveURL(version, mirror string) string {
goos := getOS()

ext := ".tar.gz"
Expand All @@ -429,7 +447,7 @@ func versionArchiveURL(version string) string {
if goos == "linux" && runtime.GOARCH == "arm" {
arch = "armv6l"
}
return "https://dl.google.com/go/" + version + "." + goos + "-" + arch + ext
return getMirrors(mirror) + version + "." + goos + "-" + arch + ext
}

const caseInsensitiveEnv = runtime.GOOS == "windows"
Expand Down