| 1 | // Copyright 2017 The Go Authors. All rights reserved. |
|---|---|
| 2 | // Use of this source code is governed by a BSD-style |
| 3 | // license that can be found in the LICENSE file. |
| 4 | |
| 5 | //go:build !plan9 |
| 6 | // +build !plan9 |
| 7 | |
| 8 | package main |
| 9 | |
| 10 | import ( |
| 11 | "archive/tar" |
| 12 | "archive/zip" |
| 13 | "compress/gzip" |
| 14 | "crypto/sha256" |
| 15 | "encoding/json" |
| 16 | "fmt" |
| 17 | "io" |
| 18 | "io/ioutil" |
| 19 | "net/http" |
| 20 | "os" |
| 21 | "path/filepath" |
| 22 | "strings" |
| 23 | ) |
| 24 | |
| 25 | const ( |
| 26 | downloadURLPrefix = "https://dl.google.com/go" |
| 27 | ) |
| 28 | |
| 29 | // downloadGoVersion downloads and upacks the specific go version to dest/go. |
| 30 | func downloadGoVersion(version, ops, arch, dest string) error { |
| 31 | suffix := "tar.gz" |
| 32 | if ops == "windows" { |
| 33 | suffix = "zip" |
| 34 | } |
| 35 | uri := fmt.Sprintf("%s/%s.%s-%s.%s", downloadURLPrefix, version, ops, arch, suffix) |
| 36 | |
| 37 | verbosef("Downloading %s", uri) |
| 38 | |
| 39 | req, err := http.NewRequest("GET", uri, nil) |
| 40 | if err != nil { |
| 41 | return err |
| 42 | } |
| 43 | req.Header.Add("User-Agent", fmt.Sprintf("golang.org-getgo/%s", version)) |
| 44 | |
| 45 | resp, err := http.DefaultClient.Do(req) |
| 46 | if err != nil { |
| 47 | return fmt.Errorf("Downloading Go from %s failed: %v", uri, err) |
| 48 | } |
| 49 | if resp.StatusCode > 299 { |
| 50 | return fmt.Errorf("Downloading Go from %s failed with HTTP status %s", uri, resp.Status) |
| 51 | } |
| 52 | defer resp.Body.Close() |
| 53 | |
| 54 | tmpf, err := ioutil.TempFile("", "go") |
| 55 | if err != nil { |
| 56 | return err |
| 57 | } |
| 58 | defer os.Remove(tmpf.Name()) |
| 59 | |
| 60 | h := sha256.New() |
| 61 | |
| 62 | w := io.MultiWriter(tmpf, h) |
| 63 | if _, err := io.Copy(w, resp.Body); err != nil { |
| 64 | return err |
| 65 | } |
| 66 | |
| 67 | verbosef("Downloading SHA %s.sha256", uri) |
| 68 | |
| 69 | sresp, err := http.Get(uri + ".sha256") |
| 70 | if err != nil { |
| 71 | return fmt.Errorf("Downloading Go sha256 from %s.sha256 failed: %v", uri, err) |
| 72 | } |
| 73 | defer sresp.Body.Close() |
| 74 | if sresp.StatusCode > 299 { |
| 75 | return fmt.Errorf("Downloading Go sha256 from %s.sha256 failed with HTTP status %s", uri, sresp.Status) |
| 76 | } |
| 77 | |
| 78 | shasum, err := ioutil.ReadAll(sresp.Body) |
| 79 | if err != nil { |
| 80 | return err |
| 81 | } |
| 82 | |
| 83 | // Check the shasum. |
| 84 | sum := fmt.Sprintf("%x", h.Sum(nil)) |
| 85 | if sum != string(shasum) { |
| 86 | return fmt.Errorf("Shasum mismatch %s vs. %s", sum, string(shasum)) |
| 87 | } |
| 88 | |
| 89 | unpackFunc := unpackTar |
| 90 | if ops == "windows" { |
| 91 | unpackFunc = unpackZip |
| 92 | } |
| 93 | if err := unpackFunc(tmpf.Name(), dest); err != nil { |
| 94 | return fmt.Errorf("Unpacking Go to %s failed: %v", dest, err) |
| 95 | } |
| 96 | return nil |
| 97 | } |
| 98 | |
| 99 | func unpack(dest, name string, fi os.FileInfo, r io.Reader) error { |
| 100 | if strings.HasPrefix(name, "go/") { |
| 101 | name = name[len("go/"):] |
| 102 | } |
| 103 | |
| 104 | path := filepath.Join(dest, name) |
| 105 | if fi.IsDir() { |
| 106 | return os.MkdirAll(path, fi.Mode()) |
| 107 | } |
| 108 | |
| 109 | f, err := os.OpenFile(path, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, fi.Mode()) |
| 110 | if err != nil { |
| 111 | return err |
| 112 | } |
| 113 | defer f.Close() |
| 114 | |
| 115 | _, err = io.Copy(f, r) |
| 116 | return err |
| 117 | } |
| 118 | |
| 119 | func unpackTar(src, dest string) error { |
| 120 | r, err := os.Open(src) |
| 121 | if err != nil { |
| 122 | return err |
| 123 | } |
| 124 | defer r.Close() |
| 125 | |
| 126 | archive, err := gzip.NewReader(r) |
| 127 | if err != nil { |
| 128 | return err |
| 129 | } |
| 130 | defer archive.Close() |
| 131 | |
| 132 | tarReader := tar.NewReader(archive) |
| 133 | |
| 134 | for { |
| 135 | header, err := tarReader.Next() |
| 136 | if err == io.EOF { |
| 137 | break |
| 138 | } else if err != nil { |
| 139 | return err |
| 140 | } |
| 141 | |
| 142 | if err := unpack(dest, header.Name, header.FileInfo(), tarReader); err != nil { |
| 143 | return err |
| 144 | } |
| 145 | } |
| 146 | |
| 147 | return nil |
| 148 | } |
| 149 | |
| 150 | func unpackZip(src, dest string) error { |
| 151 | zr, err := zip.OpenReader(src) |
| 152 | if err != nil { |
| 153 | return err |
| 154 | } |
| 155 | |
| 156 | for _, f := range zr.File { |
| 157 | fr, err := f.Open() |
| 158 | if err != nil { |
| 159 | return err |
| 160 | } |
| 161 | if err := unpack(dest, f.Name, f.FileInfo(), fr); err != nil { |
| 162 | return err |
| 163 | } |
| 164 | fr.Close() |
| 165 | } |
| 166 | |
| 167 | return nil |
| 168 | } |
| 169 | |
| 170 | func getLatestGoVersion() (string, error) { |
| 171 | resp, err := http.Get("https://golang.org/dl/?mode=json") |
| 172 | if err != nil { |
| 173 | return "", fmt.Errorf("Getting current Go version failed: %v", err) |
| 174 | } |
| 175 | defer resp.Body.Close() |
| 176 | if resp.StatusCode != http.StatusOK { |
| 177 | b, _ := ioutil.ReadAll(io.LimitReader(resp.Body, 1024)) |
| 178 | return "", fmt.Errorf("Could not get current Go release: HTTP %d: %q", resp.StatusCode, b) |
| 179 | } |
| 180 | var releases []struct { |
| 181 | Version string |
| 182 | } |
| 183 | err = json.NewDecoder(resp.Body).Decode(&releases) |
| 184 | if err != nil { |
| 185 | return "", err |
| 186 | } |
| 187 | if len(releases) < 1 { |
| 188 | return "", fmt.Errorf("Could not get at least one Go release") |
| 189 | } |
| 190 | return releases[0].Version, nil |
| 191 | } |
| 192 |
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