/
version.go
459 lines (421 loc) · 11.8 KB
/
version.go
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
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
// Code generated by golang.org/x/tools/cmd/bundle. DO NOT EDIT.
//go:generate bundle -o version.go -prefix= golang.org/dl/internal/version
// The version package permits running a specific version of Go.
//
package version
import (
"archive/tar"
"archive/zip"
"compress/gzip"
"crypto/sha256"
"errors"
"fmt"
"io"
"io/ioutil"
"log"
"net/http"
"os"
"os/exec"
"os/user"
"path"
"path/filepath"
"runtime"
"strings"
"time"
"golang.org/x/build/envutil"
)
func init() {
http.DefaultTransport = &userAgentTransport{http.DefaultTransport}
}
// Run runs the "go" tool of the provided Go version.
func Run(version string) {
log.SetFlags(0)
root, err := goroot(version)
if err != nil {
log.Fatalf("%s: %v", version, err)
}
if len(os.Args) == 2 && os.Args[1] == "download" {
if err := install(root, version); err != nil {
log.Fatalf("%s: download failed: %v", version, err)
}
os.Exit(0)
}
if _, err := os.Stat(filepath.Join(root, unpackedOkay)); err != nil {
log.Fatalf("%s: not downloaded. Run '%s download' to install to %v", version, version, root)
}
gobin := filepath.Join(root, "bin", "go"+exe())
cmd := exec.Command(gobin, os.Args[1:]...)
cmd.Stdin = os.Stdin
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
newPath := filepath.Join(root, "bin")
if p := os.Getenv("PATH"); p != "" {
newPath += string(filepath.ListSeparator) + p
}
// This envutil.Dedup call is unnecessary when the binary is
// built with Go 1.9+, but keep it around for now until Go 1.8
// is no longer seen in the wild in common distros.
cmd.Env = envutil.Dedup(caseInsensitiveEnv, append(os.Environ(), "GOROOT="+root, "PATH="+newPath))
if err := cmd.Run(); err != nil {
// TODO: return the same exit status maybe.
os.Exit(1)
}
os.Exit(0)
}
// install installs a version of Go to the named target directory, creating the
// directory as needed.
func install(targetDir, version string) error {
if _, err := os.Stat(filepath.Join(targetDir, unpackedOkay)); err == nil {
log.Printf("%s: already downloaded in %v", version, targetDir)
return nil
}
if err := os.MkdirAll(targetDir, 0755); err != nil {
return err
}
goURL := versionArchiveURL(version)
res, err := http.Head(goURL)
if err != nil {
return err
}
if res.StatusCode == http.StatusNotFound {
return fmt.Errorf("no binary release of %v for %v/%v at %v", version, getOS(), runtime.GOARCH, goURL)
}
if res.StatusCode != http.StatusOK {
return fmt.Errorf("server returned %v checking size of %v", http.StatusText(res.StatusCode), goURL)
}
base := path.Base(goURL)
archiveFile := filepath.Join(targetDir, base)
if fi, err := os.Stat(archiveFile); err != nil || fi.Size() != res.ContentLength {
if err != nil && !os.IsNotExist(err) {
// Something weird. Don't try to download.
return err
}
if err := copyFromURL(archiveFile, goURL); err != nil {
return fmt.Errorf("error downloading %v: %v", goURL, err)
}
fi, err = os.Stat(archiveFile)
if err != nil {
return err
}
if fi.Size() != res.ContentLength {
return fmt.Errorf("downloaded file %s size %v doesn't match server size %v", archiveFile, fi.Size(), res.ContentLength)
}
}
wantSHA, err := slurpURLToString(goURL + ".sha256")
if err != nil {
return err
}
if err := verifySHA256(archiveFile, strings.TrimSpace(wantSHA)); err != nil {
return fmt.Errorf("error verifying SHA256 of %v: %v", archiveFile, err)
}
log.Printf("Unpacking %v ...", archiveFile)
if err := unpackArchive(targetDir, archiveFile); err != nil {
return fmt.Errorf("extracting archive %v: %v", archiveFile, err)
}
if err := ioutil.WriteFile(filepath.Join(targetDir, unpackedOkay), nil, 0644); err != nil {
return err
}
log.Printf("Success. You may now run '%v'", version)
return nil
}
// unpackArchive unpacks the provided archive zip or tar.gz file to targetDir,
// removing the "go/" prefix from file entries.
func unpackArchive(targetDir, archiveFile string) error {
switch {
case strings.HasSuffix(archiveFile, ".zip"):
return unpackZip(targetDir, archiveFile)
case strings.HasSuffix(archiveFile, ".tar.gz"):
return unpackTarGz(targetDir, archiveFile)
default:
return errors.New("unsupported archive file")
}
}
// unpackTarGz is the tar.gz implementation of unpackArchive.
func unpackTarGz(targetDir, archiveFile string) error {
r, err := os.Open(archiveFile)
if err != nil {
return err
}
defer r.Close()
madeDir := map[string]bool{}
zr, err := gzip.NewReader(r)
if err != nil {
return err
}
tr := tar.NewReader(zr)
for {
f, err := tr.Next()
if err == io.EOF {
break
}
if err != nil {
return err
}
if !validRelPath(f.Name) {
return fmt.Errorf("tar file contained invalid name %q", f.Name)
}
rel := filepath.FromSlash(strings.TrimPrefix(f.Name, "go/"))
abs := filepath.Join(targetDir, rel)
fi := f.FileInfo()
mode := fi.Mode()
switch {
case mode.IsRegular():
// Make the directory. This is redundant because it should
// already be made by a directory entry in the tar
// beforehand. Thus, don't check for errors; the next
// write will fail with the same error.
dir := filepath.Dir(abs)
if !madeDir[dir] {
if err := os.MkdirAll(filepath.Dir(abs), 0755); err != nil {
return err
}
madeDir[dir] = true
}
wf, err := os.OpenFile(abs, os.O_RDWR|os.O_CREATE|os.O_TRUNC, mode.Perm())
if err != nil {
return err
}
n, err := io.Copy(wf, tr)
if closeErr := wf.Close(); closeErr != nil && err == nil {
err = closeErr
}
if err != nil {
return fmt.Errorf("error writing to %s: %v", abs, err)
}
if n != f.Size {
return fmt.Errorf("only wrote %d bytes to %s; expected %d", n, abs, f.Size)
}
if !f.ModTime.IsZero() {
if err := os.Chtimes(abs, f.ModTime, f.ModTime); err != nil {
// benign error. Gerrit doesn't even set the
// modtime in these, and we don't end up relying
// on it anywhere (the gomote push command relies
// on digests only), so this is a little pointless
// for now.
log.Printf("error changing modtime: %v", err)
}
}
case mode.IsDir():
if err := os.MkdirAll(abs, 0755); err != nil {
return err
}
madeDir[abs] = true
default:
return fmt.Errorf("tar file entry %s contained unsupported file type %v", f.Name, mode)
}
}
return nil
}
// unpackZip is the zip implementation of unpackArchive.
func unpackZip(targetDir, archiveFile string) error {
zr, err := zip.OpenReader(archiveFile)
if err != nil {
return err
}
defer zr.Close()
for _, f := range zr.File {
name := strings.TrimPrefix(f.Name, "go/")
outpath := filepath.Join(targetDir, name)
if f.FileInfo().IsDir() {
if err := os.MkdirAll(outpath, 0755); err != nil {
return err
}
continue
}
rc, err := f.Open()
if err != nil {
return err
}
// File
if err := os.MkdirAll(filepath.Dir(outpath), 0755); err != nil {
return err
}
out, err := os.OpenFile(outpath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, f.Mode())
if err != nil {
return err
}
_, err = io.Copy(out, rc)
rc.Close()
if err != nil {
out.Close()
return err
}
if err := out.Close(); err != nil {
return err
}
}
return nil
}
// verifySHA256 reports whether the named file has contents with
// SHA-256 of the given wantHex value.
func verifySHA256(file, wantHex string) error {
f, err := os.Open(file)
if err != nil {
return err
}
defer f.Close()
hash := sha256.New()
if _, err := io.Copy(hash, f); err != nil {
return err
}
if fmt.Sprintf("%x", hash.Sum(nil)) != wantHex {
return fmt.Errorf("%s corrupt? does not have expected SHA-256 of %v", file, wantHex)
}
return nil
}
// slurpURLToString downloads the given URL and returns it as a string.
func slurpURLToString(url_ string) (string, error) {
res, err := http.Get(url_)
if err != nil {
return "", err
}
defer res.Body.Close()
if res.StatusCode != http.StatusOK {
return "", fmt.Errorf("%s: %v", url_, res.Status)
}
slurp, err := ioutil.ReadAll(res.Body)
if err != nil {
return "", fmt.Errorf("reading %s: %v", url_, err)
}
return string(slurp), nil
}
// copyFromURL downloads srcURL to dstFile.
func copyFromURL(dstFile, srcURL string) (err error) {
f, err := os.Create(dstFile)
if err != nil {
return err
}
defer func() {
if err != nil {
f.Close()
os.Remove(dstFile)
}
}()
c := &http.Client{
Transport: &userAgentTransport{&http.Transport{
// It's already compressed. Prefer accurate ContentLength.
// (Not that GCS would try to compress it, though)
DisableCompression: true,
DisableKeepAlives: true,
Proxy: http.ProxyFromEnvironment,
}},
}
res, err := c.Get(srcURL)
if err != nil {
return err
}
defer res.Body.Close()
if res.StatusCode != http.StatusOK {
return errors.New(res.Status)
}
pw := &progressWriter{w: f, total: res.ContentLength}
n, err := io.Copy(pw, res.Body)
if err != nil {
return err
}
if res.ContentLength != -1 && res.ContentLength != n {
return fmt.Errorf("copied %v bytes; expected %v", n, res.ContentLength)
}
pw.update() // 100%
return f.Close()
}
type progressWriter struct {
w io.Writer
n int64
total int64
last time.Time
}
func (p *progressWriter) update() {
end := " ..."
if p.n == p.total {
end = ""
}
fmt.Fprintf(os.Stderr, "Downloaded %0.1f%% (%d / %d bytes)%s\n",
(100.0*float64(p.n))/float64(p.total),
p.n, p.total, end)
}
func (p *progressWriter) Write(buf []byte) (n int, err error) {
n, err = p.w.Write(buf)
p.n += int64(n)
if now := time.Now(); now.Unix() != p.last.Unix() {
p.update()
p.last = now
}
return
}
// getOS returns runtime.GOOS. It exists as a function just for lazy
// testing of the Windows zip path when running on Linux/Darwin.
func getOS() string {
return runtime.GOOS
}
// versionArchiveURL returns the zip or tar.gz URL of the given Go version.
func versionArchiveURL(version string) string {
goos := getOS()
// TODO: Maybe we should parse
// https://storage.googleapis.com/go-builder-data/dl-index.txt ?
// Let's just guess the URL for now and see if it's there.
// Then we don't have to maintain that txt file too.
ext := ".tar.gz"
if goos == "windows" {
ext = ".zip"
}
arch := runtime.GOARCH
if goos == "linux" && runtime.GOARCH == "arm" {
arch = "armv6l"
}
return "https://storage.googleapis.com/golang/" + version + "." + goos + "-" + arch + ext
}
const caseInsensitiveEnv = runtime.GOOS == "windows"
// unpackedOkay is a sentinel zero-byte file to indicate that the Go
// version was downloaded and unpacked successfully.
const unpackedOkay = ".unpacked-success"
func exe() string {
if runtime.GOOS == "windows" {
return ".exe"
}
return ""
}
func goroot(version string) (string, error) {
home, err := homedir()
if err != nil {
return "", fmt.Errorf("failed to get home directory: %v", err)
}
return filepath.Join(home, "sdk", version), nil
}
func homedir() (string, error) {
switch getOS() {
case "plan9":
return "", fmt.Errorf("%q not yet supported", runtime.GOOS)
case "windows":
if dir := os.Getenv("USERPROFILE"); dir != "" {
return dir, nil
}
return "", errors.New("can't find user home directory; %USERPROFILE% is empty")
default:
if dir := os.Getenv("HOME"); dir != "" {
return dir, nil
}
if u, err := user.Current(); err == nil && u.HomeDir != "" {
return u.HomeDir, nil
}
return "", errors.New("can't find user home directory; $HOME is empty")
}
}
func validRelPath(p string) bool {
if p == "" || strings.Contains(p, `\`) || strings.HasPrefix(p, "/") || strings.Contains(p, "../") {
return false
}
return true
}
type userAgentTransport struct {
rt http.RoundTripper
}
func (uat userAgentTransport) RoundTrip(r *http.Request) (*http.Response, error) {
version := runtime.Version()
if strings.Contains(version, "devel") {
// Strip the SHA hash and date. We don't want spaces or other tokens (see RFC2616 14.43)
version = "devel"
}
r.Header.Set("User-Agent", "golang-x-build-version/"+version)
return uat.rt.RoundTrip(r)
}