File: build.go

package info (click to toggle)
restic 0.9.4+ds-2
  • links: PTS, VCS
  • area: main
  • in suites: buster
  • size: 26,636 kB
  • sloc: sh: 1,460; makefile: 46; python: 35
file content (632 lines) | stat: -rw-r--r-- 16,040 bytes parent folder | download
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
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
// Description
//
// This program aims to make building Go programs for end users easier by just
// calling it with `go run`, without having to setup a GOPATH.
//
// For Go < 1.11, it'll create a new GOPATH in a temporary directory, then run
// `go build` on the package configured as Main in the Config struct.
//
// For Go >= 1.11 if the file go.mod is present, it'll use Go modules and not
// setup a GOPATH. It builds the package configured as Main in the Config
// struct with `go build -mod=vendor` to use the vendored dependencies.
// The variable GOPROXY is set to `off` so that no network calls are made. All
// files are copied to a temporary directory before `go build` is called within
// that directory.

// BSD 2-Clause License
//
// Copyright (c) 2016-2018, Alexander Neumann <alexander@bumpern.de>
// All rights reserved.
//
// This file has been copied from the repository at:
// https://github.com/fd0/build-go
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice, this
//   list of conditions and the following disclaimer.
//
// * Redistributions in binary form must reproduce the above copyright notice,
//   this list of conditions and the following disclaimer in the documentation
//   and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

// +build ignore_build_go

package main

import (
	"fmt"
	"io"
	"io/ioutil"
	"os"
	"os/exec"
	"path/filepath"
	"runtime"
	"strconv"
	"strings"
)

// config contains the configuration for the program to build.
var config = Config{
	Name:             "restic",                                // name of the program executable and directory
	Namespace:        "github.com/restic/restic",              // subdir of GOPATH, e.g. "github.com/foo/bar"
	Main:             "./cmd/restic",                          // package name for the main package
	DefaultBuildTags: []string{"selfupdate"},                  // specify build tags which are always used
	Tests:            []string{"./..."},                       // tests to run
	MinVersion:       GoVersion{Major: 1, Minor: 9, Patch: 0}, // minimum Go version supported
}

// Config configures the build.
type Config struct {
	Name             string
	Namespace        string
	Main             string
	DefaultBuildTags []string
	Tests            []string
	MinVersion       GoVersion
}

var (
	verbose    bool
	keepGopath bool
	runTests   bool
	enableCGO  bool
	enablePIE  bool
	goVersion  = ParseGoVersion(runtime.Version())
)

// copy all Go files in src to dst, creating directories on the fly, so calling
//
//   copy("/tmp/gopath/src/github.com/restic/restic", "/home/u/restic")
//
// with "/home/u/restic" containing the file "foo.go" yields the following tree
// at "/tmp/gopath":
//
//   /tmp/gopath
//   └── src
//       └── github.com
//           └── restic
//               └── restic
//                   └── foo.go
func copy(dst, src string) error {
	verbosePrintf("copy contents of %v to %v\n", src, dst)
	return filepath.Walk(src, func(name string, fi os.FileInfo, err error) error {
		if name == src {
			return err
		}

		if name == ".git" {
			return filepath.SkipDir
		}

		if err != nil {
			return err
		}

		if fi.IsDir() {
			return nil
		}

		intermediatePath, err := filepath.Rel(src, name)
		if err != nil {
			return err
		}

		fileSrc := filepath.Join(src, intermediatePath)
		fileDst := filepath.Join(dst, intermediatePath)

		return copyFile(fileDst, fileSrc)
	})
}

func directoryExists(dirname string) bool {
	stat, err := os.Stat(dirname)
	if err != nil && os.IsNotExist(err) {
		return false
	}

	return stat.IsDir()
}

func fileExists(filename string) bool {
	stat, err := os.Stat(filename)
	if err != nil && os.IsNotExist(err) {
		return false
	}

	return stat.Mode().IsRegular()
}

// copyFile creates dst from src, preserving file attributes and timestamps.
func copyFile(dst, src string) error {
	fi, err := os.Stat(src)
	if err != nil {
		return err
	}

	fsrc, err := os.Open(src)
	if err != nil {
		return err
	}

	if err = os.MkdirAll(filepath.Dir(dst), 0755); err != nil {
		fmt.Printf("MkdirAll(%v)\n", filepath.Dir(dst))
		return err
	}

	fdst, err := os.Create(dst)
	if err != nil {
		_ = fsrc.Close()
		return err
	}

	_, err = io.Copy(fdst, fsrc)
	if err != nil {
		_ = fsrc.Close()
		_ = fdst.Close()
		return err
	}

	err = fdst.Close()
	if err != nil {
		_ = fsrc.Close()
		return err
	}

	err = fsrc.Close()
	if err != nil {
		return err
	}

	err = os.Chmod(dst, fi.Mode())
	if err != nil {
		return err
	}

	return os.Chtimes(dst, fi.ModTime(), fi.ModTime())
}

// die prints the message with fmt.Fprintf() to stderr and exits with an error
// code.
func die(message string, args ...interface{}) {
	fmt.Fprintf(os.Stderr, message, args...)
	os.Exit(1)
}

func showUsage(output io.Writer) {
	fmt.Fprintf(output, "USAGE: go run build.go OPTIONS\n")
	fmt.Fprintf(output, "\n")
	fmt.Fprintf(output, "OPTIONS:\n")
	fmt.Fprintf(output, "  -v     --verbose       output more messages\n")
	fmt.Fprintf(output, "  -t     --tags          specify additional build tags\n")
	fmt.Fprintf(output, "  -k     --keep-tempdir  do not remove the temporary directory after build\n")
	fmt.Fprintf(output, "  -T     --test          run tests\n")
	fmt.Fprintf(output, "  -o     --output        set output file name\n")
	fmt.Fprintf(output, "         --enable-cgo    use CGO to link against libc\n")
	fmt.Fprintf(output, "         --enable-pie    use PIE buildmode\n")
	fmt.Fprintf(output, "         --goos value    set GOOS for cross-compilation\n")
	fmt.Fprintf(output, "         --goarch value  set GOARCH for cross-compilation\n")
	fmt.Fprintf(output, "         --goarm value   set GOARM for cross-compilation\n")
	fmt.Fprintf(output, "         --tempdir dir   use a specific directory for compilation\n")
}

func verbosePrintf(message string, args ...interface{}) {
	if !verbose {
		return
	}

	fmt.Printf("build: "+message, args...)
}

// cleanEnv returns a clean environment with GOPATH, GOBIN and GO111MODULE
// removed (if present).
func cleanEnv() (env []string) {
	removeKeys := map[string]struct{}{
		"GOPATH":      struct{}{},
		"GOBIN":       struct{}{},
		"GO111MODULE": struct{}{},
	}

	for _, v := range os.Environ() {
		data := strings.SplitN(v, "=", 2)
		name := data[0]

		if _, ok := removeKeys[name]; ok {
			continue
		}

		env = append(env, v)
	}

	return env
}

// build runs "go build args..." with GOPATH set to gopath.
func build(cwd string, env map[string]string, args ...string) error {
	a := []string{"build"}

	if goVersion.AtLeast(GoVersion{1, 10, 0}) {
		verbosePrintf("Go version is at least 1.10, using new syntax for -gcflags\n")
		// use new prefix
		a = append(a, "-asmflags", fmt.Sprintf("all=-trimpath=%s", cwd))
		a = append(a, "-gcflags", fmt.Sprintf("all=-trimpath=%s", cwd))
	} else {
		a = append(a, "-asmflags", fmt.Sprintf("-trimpath=%s", cwd))
		a = append(a, "-gcflags", fmt.Sprintf("-trimpath=%s", cwd))
	}
	if enablePIE {
		a = append(a, "-buildmode=pie")
	}

	a = append(a, args...)
	cmd := exec.Command("go", a...)
	cmd.Env = append(cleanEnv(), "GOPROXY=off")
	for k, v := range env {
		cmd.Env = append(cmd.Env, k+"="+v)
	}
	if !enableCGO {
		cmd.Env = append(cmd.Env, "CGO_ENABLED=0")
	}

	cmd.Dir = cwd
	cmd.Stdout = os.Stdout
	cmd.Stderr = os.Stderr

	verbosePrintf("chdir %q\n", cwd)
	verbosePrintf("go %q\n", a)

	return cmd.Run()
}

// test runs "go test args..." with GOPATH set to gopath.
func test(cwd string, env map[string]string, args ...string) error {
	args = append([]string{"test", "-count", "1"}, args...)
	cmd := exec.Command("go", args...)
	cmd.Env = append(cleanEnv(), "GOPROXY=off")
	for k, v := range env {
		cmd.Env = append(cmd.Env, k+"="+v)
	}
	if !enableCGO {
		cmd.Env = append(cmd.Env, "CGO_ENABLED=0")
	}
	cmd.Dir = cwd
	cmd.Stdout = os.Stdout
	cmd.Stderr = os.Stderr

	verbosePrintf("chdir %q\n", cwd)
	verbosePrintf("go %q\n", args)

	return cmd.Run()
}

// getVersion returns the version string from the file VERSION in the current
// directory.
func getVersionFromFile() string {
	buf, err := ioutil.ReadFile("VERSION")
	if err != nil {
		verbosePrintf("error reading file VERSION: %v\n", err)
		return ""
	}

	return strings.TrimSpace(string(buf))
}

// getVersion returns a version string which is a combination of the contents
// of the file VERSION in the current directory and the version from git (if
// available).
func getVersion() string {
	versionFile := getVersionFromFile()
	versionGit := getVersionFromGit()

	verbosePrintf("version from file 'VERSION' is %q, version from git %q\n",
		versionFile, versionGit)

	switch {
	case versionFile == "":
		return versionGit
	case versionGit == "":
		return versionFile
	}

	return fmt.Sprintf("%s (%s)", versionFile, versionGit)
}

// getVersionFromGit returns a version string that identifies the currently
// checked out git commit.
func getVersionFromGit() string {
	cmd := exec.Command("git", "describe",
		"--long", "--tags", "--dirty", "--always")
	out, err := cmd.Output()
	if err != nil {
		verbosePrintf("git describe returned error: %v\n", err)
		return ""
	}

	version := strings.TrimSpace(string(out))
	verbosePrintf("git version is %s\n", version)
	return version
}

// Constants represents a set of constants that are set in the final binary to
// the given value via compiler flags.
type Constants map[string]string

// LDFlags returns the string that can be passed to go build's `-ldflags`.
func (cs Constants) LDFlags() string {
	l := make([]string, 0, len(cs))

	for k, v := range cs {
		l = append(l, fmt.Sprintf(`-X "%s=%s"`, k, v))
	}

	return strings.Join(l, " ")
}

// GoVersion is the version of Go used to compile the project.
type GoVersion struct {
	Major int
	Minor int
	Patch int
}

// ParseGoVersion parses the Go version s. If s cannot be parsed, the returned GoVersion is null.
func ParseGoVersion(s string) (v GoVersion) {
	if !strings.HasPrefix(s, "go") {
		return
	}

	s = s[2:]
	data := strings.Split(s, ".")
	if len(data) < 2 || len(data) > 3 {
		// invalid version
		return GoVersion{}
	}

	var err error

	v.Major, err = strconv.Atoi(data[0])
	if err != nil {
		return GoVersion{}
	}

	// try to parse the minor version while removing an eventual suffix (like
	// "rc2" or so)
	for s := data[1]; s != ""; s = s[:len(s)-1] {
		v.Minor, err = strconv.Atoi(s)
		if err == nil {
			break
		}
	}

	if v.Minor == 0 {
		// no minor version found
		return GoVersion{}
	}

	if len(data) >= 3 {
		v.Patch, err = strconv.Atoi(data[2])
		if err != nil {
			return GoVersion{}
		}
	}

	return
}

// AtLeast returns true if v is at least as new as other. If v is empty, true is returned.
func (v GoVersion) AtLeast(other GoVersion) bool {
	var empty GoVersion

	// the empty version satisfies all versions
	if v == empty {
		return true
	}

	if v.Major < other.Major {
		return false
	}

	if v.Minor < other.Minor {
		return false
	}

	if v.Patch < other.Patch {
		return false
	}

	return true
}

func (v GoVersion) String() string {
	return fmt.Sprintf("Go %d.%d.%d", v.Major, v.Minor, v.Patch)
}

func main() {
	if !goVersion.AtLeast(config.MinVersion) {
		fmt.Fprintf(os.Stderr, "%s detected, this program requires at least %s\n", goVersion, config.MinVersion)
		os.Exit(1)
	}

	buildTags := config.DefaultBuildTags

	skipNext := false
	params := os.Args[1:]

	goEnv := map[string]string{}
	buildEnv := map[string]string{
		"GOOS":   runtime.GOOS,
		"GOARCH": runtime.GOARCH,
		"GOARM":  "",
	}

	tempdir := ""

	var outputFilename string

	for i, arg := range params {
		if skipNext {
			skipNext = false
			continue
		}

		switch arg {
		case "-v", "--verbose":
			verbose = true
		case "-k", "--keep-gopath":
			keepGopath = true
		case "-t", "-tags", "--tags":
			if i+1 >= len(params) {
				die("-t given but no tag specified")
			}
			skipNext = true
			buildTags = append(buildTags, strings.Split(params[i+1], " ")...)
		case "-o", "--output":
			skipNext = true
			outputFilename = params[i+1]
		case "--tempdir":
			skipNext = true
			tempdir = params[i+1]
		case "-T", "--test":
			runTests = true
		case "--enable-cgo":
			enableCGO = true
		case "--enable-pie":
			enablePIE = true
		case "--goos":
			skipNext = true
			buildEnv["GOOS"] = params[i+1]
		case "--goarch":
			skipNext = true
			buildEnv["GOARCH"] = params[i+1]
		case "--goarm":
			skipNext = true
			buildEnv["GOARM"] = params[i+1]
		case "-h":
			showUsage(os.Stdout)
			return
		default:
			fmt.Fprintf(os.Stderr, "Error: unknown option %q\n\n", arg)
			showUsage(os.Stderr)
			os.Exit(1)
		}
	}

	verbosePrintf("detected Go version %v\n", goVersion)

	for i := range buildTags {
		buildTags[i] = strings.TrimSpace(buildTags[i])
	}

	verbosePrintf("build tags: %s\n", buildTags)

	root, err := os.Getwd()
	if err != nil {
		die("Getwd(): %v\n", err)
	}

	if outputFilename == "" {
		outputFilename = config.Name
		if buildEnv["GOOS"] == "windows" {
			outputFilename += ".exe"
		}
	}

	output := outputFilename
	if !filepath.IsAbs(output) {
		output = filepath.Join(root, output)
	}

	version := getVersion()
	constants := Constants{}
	if version != "" {
		constants["main.version"] = version
	}
	ldflags := "-s -w " + constants.LDFlags()
	verbosePrintf("ldflags: %s\n", ldflags)

	var (
		buildArgs []string
		testArgs  []string
	)

	mainPackage := config.Main
	if strings.HasPrefix(mainPackage, config.Namespace) {
		mainPackage = strings.Replace(mainPackage, config.Namespace, "./", 1)
	}

	buildTarget := filepath.FromSlash(mainPackage)
	buildCWD := ""

	if goVersion.AtLeast(GoVersion{1, 11, 0}) && fileExists("go.mod") {
		verbosePrintf("Go >= 1.11 and 'go.mod' found, building with modules\n")
		buildCWD = root

		buildArgs = append(buildArgs, "-mod=vendor")
		testArgs = append(testArgs, "-mod=vendor")
	} else {
		if tempdir == "" {
			tempdir, err = ioutil.TempDir("", fmt.Sprintf("%v-build-", config.Name))
			if err != nil {
				die("TempDir(): %v\n", err)
			}
		}

		verbosePrintf("Go < 1.11 or 'go.mod' not found, create GOPATH at %v\n", tempdir)
		targetdir := filepath.Join(tempdir, "src", filepath.FromSlash(config.Namespace))
		if err = copy(targetdir, root); err != nil {
			die("copying files from %v to %v/src failed: %v\n", root, tempdir, err)
		}

		defer func() {
			if !keepGopath {
				verbosePrintf("remove %v\n", tempdir)
				if err = os.RemoveAll(tempdir); err != nil {
					die("remove GOPATH at %s failed: %v\n", tempdir, err)
				}
			} else {
				verbosePrintf("leaving temporary GOPATH at %v\n", tempdir)
			}
		}()

		buildCWD = targetdir

		goEnv["GOPATH"] = tempdir
		buildEnv["GOPATH"] = tempdir
	}

	verbosePrintf("environment:\n  go: %v\n  build: %v\n", goEnv, buildEnv)

	buildArgs = append(buildArgs,
		"-tags", strings.Join(buildTags, " "),
		"-ldflags", ldflags,
		"-o", output, buildTarget,
	)

	err = build(buildCWD, buildEnv, buildArgs...)
	if err != nil {
		die("build failed: %v\n", err)
	}

	if runTests {
		verbosePrintf("running tests\n")

		testArgs = append(testArgs, config.Tests...)

		err = test(buildCWD, goEnv, testArgs...)
		if err != nil {
			die("running tests failed: %v\n", err)
		}
	}
}