Repository navigation
Expand file tree
/
Copy pathdownload.go
More file actions
191 lines (161 loc) · 3.98 KB
/
Copy pathdownload.go
File metadata and controls
191 lines (161 loc) · 3.98 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
// 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.
//go:build !plan9
// +build !plan9
package main
import (
"archive/tar"
"archive/zip"
"compress/gzip"
"crypto/sha256"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"net/http"
"os"
"path/filepath"
"strings"
)
const (
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("https://golang.org/dl/?mode=json")
if err != nil {
return "", fmt.Errorf("Getting current Go version failed: %v", err)
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
b, _ := ioutil.ReadAll(io.LimitReader(resp.Body, 1024))
return "", fmt.Errorf("Could not get current Go release: HTTP %d: %q", resp.StatusCode, b)
}
var releases []struct {
Version string
}
err = json.NewDecoder(resp.Body).Decode(&releases)
if err != nil {
return "", err
}
if len(releases) < 1 {
return "", fmt.Errorf("Could not get at least one Go release")
}
return releases[0].Version, nil
}