aboutsummaryrefslogtreecommitdiffstats
path: root/build/ci.go
blob: f5ef54b7545d51916cfac6705fca9e0b653e879e (plain) (blame)
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
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
// Copyright 2016 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.

// +build none

/*
The ci command is called from Continuous Integration scripts.

Usage: go run ci.go <command> <command flags/arguments>

Available commands are:

   install    [-arch architecture] [ packages... ]                                           -- builds packages and executables
   test       [ -coverage ] [ -vet ] [ packages... ]                                         -- runs the tests
   archive    [-arch architecture] [ -type zip|tar ] [ -signer key-envvar ] [ -upload dest ] -- archives build artefacts
   importkeys                                                                                -- imports signing keys from env
   debsrc     [ -signer key-id ] [ -upload dest ]                                            -- creates a debian source package
   nsis                                                                                      -- creates a Windows NSIS installer
   xgo        [ options ]                                                                    -- cross builds according to options

For all commands, -n prevents execution of external programs (dry run mode).

*/
package main

import (
    "bytes"
    "encoding/base64"
    "flag"
    "fmt"
    "go/parser"
    "go/token"
    "io/ioutil"
    "log"
    "os"
    "os/exec"
    "path/filepath"
    "runtime"
    "strings"
    "time"

    "github.com/ethereum/go-ethereum/internal/build"
)

var (
    // Files that end up in the geth*.zip archive.
    gethArchiveFiles = []string{
        "COPYING",
        executablePath("geth"),
    }

    // Files that end up in the geth-alltools*.zip archive.
    allToolsArchiveFiles = []string{
        "COPYING",
        executablePath("abigen"),
        executablePath("evm"),
        executablePath("geth"),
        executablePath("rlpdump"),
    }

    // A debian package is created for all executables listed here.
    debExecutables = []debExecutable{
        {
            Name:        "geth",
            Description: "Ethereum CLI client.",
        },
        {
            Name:        "rlpdump",
            Description: "Developer utility tool that prints RLP structures.",
        },
        {
            Name:        "evm",
            Description: "Developer utility version of the EVM (Ethereum Virtual Machine) that is capable of running bytecode snippets within a configurable environment and execution mode.",
        },
        {
            Name:        "abigen",
            Description: "Source code generator to convert Ethereum contract definitions into easy to use, compile-time type-safe Go packages.",
        },
    }

    // Distros for which packages are created.
    // Note: vivid is unsupported because there is no golang-1.6 package for it.
    debDistros = []string{"trusty", "wily", "xenial", "yakkety"}
)

var GOBIN, _ = filepath.Abs(filepath.Join("build", "bin"))

func executablePath(name string) string {
    if runtime.GOOS == "windows" {
        name += ".exe"
    }
    return filepath.Join(GOBIN, name)
}

func main() {
    log.SetFlags(log.Lshortfile)

    if _, err := os.Stat(filepath.Join("build", "ci.go")); os.IsNotExist(err) {
        log.Fatal("this script must be run from the root of the repository")
    }
    if len(os.Args) < 2 {
        log.Fatal("need subcommand as first argument")
    }
    switch os.Args[1] {
    case "install":
        doInstall(os.Args[2:])
    case "test":
        doTest(os.Args[2:])
    case "archive":
        doArchive(os.Args[2:])
    case "debsrc":
        doDebianSource(os.Args[2:])
    case "nsis":
        doWindowsInstaller(os.Args[2:])
    case "xgo":
        doXgo(os.Args[2:])
    default:
        log.Fatal("unknown command ", os.Args[1])
    }
}

// Compiling

func doInstall(cmdline []string) {
    var (
        arch = flag.String("arch", "", "Architecture to cross build for")
    )
    flag.CommandLine.Parse(cmdline)
    env := build.Env()

    // Check Go version. People regularly open issues about compilation
    // failure with outdated Go. This should save them the trouble.
    if runtime.Version() < "go1.4" && !strings.HasPrefix(runtime.Version(), "devel") {
        log.Println("You have Go version", runtime.Version())
        log.Println("go-ethereum requires at least Go version 1.4 and cannot")
        log.Println("be compiled with an earlier version. Please upgrade your Go installation.")
        os.Exit(1)
    }
    // Compile packages given as arguments, or everything if there are no arguments.
    packages := []string{"./..."}
    if flag.NArg() > 0 {
        packages = flag.Args()
    }
    if *arch == "" || *arch == runtime.GOARCH {
        goinstall := goTool("install", buildFlags(env)...)
        goinstall.Args = append(goinstall.Args, "-v")
        goinstall.Args = append(goinstall.Args, packages...)
        build.MustRun(goinstall)
        return
    }
    // If we are cross compiling to ARMv5 ARMv6 or ARMv7, clean any prvious builds
    if *arch == "arm" {
        os.RemoveAll(filepath.Join(runtime.GOROOT(), "pkg", runtime.GOOS+"_arm"))
        for _, path := range filepath.SplitList(build.GOPATH()) {
            os.RemoveAll(filepath.Join(path, "pkg", runtime.GOOS+"_arm"))
        }
    }
    // Seems we are cross compiling, work around forbidden GOBIN
    goinstall := goToolArch(*arch, "install", buildFlags(env)...)
    goinstall.Args = append(goinstall.Args, "-v")
    goinstall.Args = append(goinstall.Args, []string{"-buildmode", "archive"}...)
    goinstall.Args = append(goinstall.Args, packages...)
    build.MustRun(goinstall)

    if cmds, err := ioutil.ReadDir("cmd"); err == nil {
        for _, cmd := range cmds {
            pkgs, err := parser.ParseDir(token.NewFileSet(), filepath.Join(".", "cmd", cmd.Name()), nil, parser.PackageClauseOnly)
            if err != nil {
                log.Fatal(err)
            }
            for name, _ := range pkgs {
                if name == "main" {
                    gobuild := goToolArch(*arch, "build", buildFlags(env)...)
                    gobuild.Args = append(gobuild.Args, "-v")
                    gobuild.Args = append(gobuild.Args, []string{"-o", executablePath(cmd.Name())}...)
                    gobuild.Args = append(gobuild.Args, "."+string(filepath.Separator)+filepath.Join("cmd", cmd.Name()))
                    build.MustRun(gobuild)
                    break
                }
            }
        }
    }
}

func buildFlags(env build.Environment) (flags []string) {
    if os.Getenv("GO_OPENCL") != "" {
        flags = append(flags, "-tags", "opencl")
    }

    // Since Go 1.5, the separator char for link time assignments
    // is '=' and using ' ' prints a warning. However, Go < 1.5 does
    // not support using '='.
    sep := " "
    if runtime.Version() > "go1.5" || strings.Contains(runtime.Version(), "devel") {
        sep = "="
    }
    // Set gitCommit constant via link-time assignment.
    if env.Commit != "" {
        flags = append(flags, "-ldflags", "-X main.gitCommit"+sep+env.Commit)
    }
    return flags
}

func goTool(subcmd string, args ...string) *exec.Cmd {
    return goToolArch(runtime.GOARCH, subcmd, args...)
}

func goToolArch(arch string, subcmd string, args ...string) *exec.Cmd {
    gocmd := filepath.Join(runtime.GOROOT(), "bin", "go")
    cmd := exec.Command(gocmd, subcmd)
    cmd.Args = append(cmd.Args, args...)
    cmd.Env = []string{
        "GO15VENDOREXPERIMENT=1",
        "GOPATH=" + build.GOPATH(),
    }
    if arch == "" || arch == runtime.GOARCH {
        cmd.Env = append(cmd.Env, "GOBIN="+GOBIN)
    } else {
        cmd.Env = append(cmd.Env, "CGO_ENABLED=1")
        cmd.Env = append(cmd.Env, "GOARCH="+arch)
    }
    for _, e := range os.Environ() {
        if strings.HasPrefix(e, "GOPATH=") || strings.HasPrefix(e, "GOBIN=") {
            continue
        }
        cmd.Env = append(cmd.Env, e)
    }
    return cmd
}

// Running The Tests
//
// "tests" also includes static analysis tools such as vet.

func doTest(cmdline []string) {
    var (
        vet      = flag.Bool("vet", false, "Whether to run go vet")
        coverage = flag.Bool("coverage", false, "Whether to record code coverage")
    )
    flag.CommandLine.Parse(cmdline)

    packages := []string{"./..."}
    if len(flag.CommandLine.Args()) > 0 {
        packages = flag.CommandLine.Args()
    }
    if len(packages) == 1 && packages[0] == "./..." {
        // Resolve ./... manually since go vet will fail on vendored stuff
        out, err := goTool("list", "./...").CombinedOutput()
        if err != nil {
            log.Fatalf("package listing failed: %v\n%s", err, string(out))
        }
        packages = []string{}
        for _, line := range strings.Split(string(out), "\n") {
            if !strings.Contains(line, "vendor") {
                packages = append(packages, strings.TrimSpace(line))
            }
        }
    }
    // Run analysis tools before the tests.
    if *vet {
        build.MustRun(goTool("vet", packages...))
    }

    // Run the actual tests.
    gotest := goTool("test")
    // Test a single package at a time. CI builders are slow
    // and some tests run into timeouts under load.
    gotest.Args = append(gotest.Args, "-p", "1")
    if *coverage {
        gotest.Args = append(gotest.Args, "-covermode=atomic", "-cover")
    }
    gotest.Args = append(gotest.Args, packages...)
    build.MustRun(gotest)
}

// Release Packaging

func doArchive(cmdline []string) {
    var (
        arch   = flag.String("arch", runtime.GOARCH, "Architecture cross packaging")
        atype  = flag.String("type", "zip", "Type of archive to write (zip|tar)")
        signer = flag.String("signer", "", `Environment variable holding the signing key (e.g. LINUX_SIGNING_KEY)`)
        upload = flag.String("upload", "", `Destination to upload the archives (usually "gethstore/builds")`)
        ext    string
    )
    flag.CommandLine.Parse(cmdline)
    switch *atype {
    case "zip":
        ext = ".zip"
    case "tar":
        ext = ".tar.gz"
    default:
        log.Fatal("unknown archive type: ", atype)
    }

    var (
        env      = build.Env()
        base     = archiveBasename(*arch, env)
        geth     = "geth-" + base + ext
        alltools = "geth-alltools-" + base + ext
    )
    maybeSkipArchive(env)
    if err := build.WriteArchive(geth, gethArchiveFiles); err != nil {
        log.Fatal(err)
    }
    if err := build.WriteArchive(alltools, allToolsArchiveFiles); err != nil {
        log.Fatal(err)
    }
    for _, archive := range []string{geth, alltools} {
        if err := archiveUpload(archive, *upload, *signer); err != nil {
            log.Fatal(err)
        }
    }
}

func archiveBasename(arch string, env build.Environment) string {
    platform := runtime.GOOS + "-" + arch
    if arch == "arm" {
        platform += os.Getenv("GOARM")
    }
    archive := platform + "-" + build.VERSION()
    if isUnstableBuild(env) {
        archive += "-unstable"
    }
    if env.Commit != "" {
        archive += "-" + env.Commit[:8]
    }
    return archive
}

func archiveUpload(archive string, blobstore string, signer string) error {
    // If signing was requested, generate the signature files
    if signer != "" {
        pgpkey, err := base64.StdEncoding.DecodeString(os.Getenv(signer))
        if err != nil {
            return fmt.Errorf("invalid base64 %s", signer)
        }
        if err := build.PGPSignFile(archive, archive+".asc", string(pgpkey)); err != nil {
            return err
        }
    }
    // If uploading to Azure was requested, push the archive possibly with its signature
    if blobstore != "" {
        auth := build.AzureBlobstoreConfig{
            Account:   strings.Split(blobstore, "/")[0],
            Token:     os.Getenv("AZURE_BLOBSTORE_TOKEN"),
            Container: strings.SplitN(blobstore, "/", 2)[1],
        }
        if err := build.AzureBlobstoreUpload(archive, archive, auth); err != nil {
            return err
        }
        if signer != "" {
            if err := build.AzureBlobstoreUpload(archive+".asc", archive+".asc", auth); err != nil {
                return err
            }
        }
    }
    return nil
}

// skips archiving for some build configurations.
func maybeSkipArchive(env build.Environment) {
    if env.IsPullRequest {
        log.Printf("skipping because this is a PR build")
        os.Exit(0)
    }
    if env.Branch != "develop" && !strings.HasPrefix(env.Tag, "v1.") {
        log.Printf("skipping because branch %q, tag %q is not on the whitelist", env.Branch, env.Tag)
        os.Exit(0)
    }
}

// Debian Packaging

func doDebianSource(cmdline []string) {
    var (
        signer  = flag.String("signer", "", `Signing key name, also used as package author`)
        upload  = flag.String("upload", "", `Where to upload the source package (usually "ppa:ethereum/ethereum")`)
        workdir = flag.String("workdir", "", `Output directory for packages (uses temp dir if unset)`)
        now     = time.Now()
    )
    flag.CommandLine.Parse(cmdline)
    *workdir = makeWorkdir(*workdir)
    env := build.Env()
    maybeSkipArchive(env)

    // Import the signing key.
    if b64key := os.Getenv("PPA_SIGNING_KEY"); b64key != "" {
        key, err := base64.StdEncoding.DecodeString(b64key)
        if err != nil {
            log.Fatal("invalid base64 PPA_SIGNING_KEY")
        }
        gpg := exec.Command("gpg", "--import")
        gpg.Stdin = bytes.NewReader(key)
        build.MustRun(gpg)
    }

    // Create the packages.
    for _, distro := range debDistros {
        meta := newDebMetadata(distro, *signer, env, now)
        pkgdir := stageDebianSource(*workdir, meta)
        debuild := exec.Command("debuild", "-S", "-sa", "-us", "-uc")
        debuild.Dir = pkgdir
        build.MustRun(debuild)

        changes := fmt.Sprintf("%s_%s_source.changes", meta.Name(), meta.VersionString())
        changes = filepath.Join(*workdir, changes)
        if *signer != "" {
            build.MustRunCommand("debsign", changes)
        }
        if *upload != "" {
            build.MustRunCommand("dput", *upload, changes)
        }
    }
}

func makeWorkdir(wdflag string) string {
    var err error
    if wdflag != "" {
        err = os.MkdirAll(wdflag, 0744)
    } else {
        wdflag, err = ioutil.TempDir("", "geth-build-")
    }
    if err != nil {
        log.Fatal(err)
    }
    return wdflag
}

func isUnstableBuild(env build.Environment) bool {
    if env.Branch != "develop" && env.Tag != "" {
        return false
    }
    return true
}

type debMetadata struct {
    Env build.Environment

    // go-ethereum version being built. Note that this
    // is not the debian package version. The package version
    // is constructed by VersionString.
    Version string

    Author       string // "name <email>", also selects signing key
    Distro, Time string
    Executables  []debExecutable
}

type debExecutable struct {
    Name, Description string
}

func newDebMetadata(distro, author string, env build.Environment, t time.Time) debMetadata {
    if author == "" {
        // No signing key, use default author.
        author = "Ethereum Builds <fjl@ethereum.org>"
    }
    return debMetadata{
        Env:         env,
        Author:      author,
        Distro:      distro,
        Version:     build.VERSION(),
        Time:        t.Format(time.RFC1123Z),
        Executables: debExecutables,
    }
}

// Name returns the name of the metapackage that depends
// on all executable packages.
func (meta debMetadata) Name() string {
    if isUnstableBuild(meta.Env) {
        return "ethereum-unstable"
    }
    return "ethereum"
}

// VersionString returns the debian version of the packages.
func (meta debMetadata) VersionString() string {
    vsn := meta.Version
    if meta.Env.Buildnum != "" {
        vsn += "+build" + meta.Env.Buildnum
    }
    if meta.Distro != "" {
        vsn += "+" + meta.Distro
    }
    return vsn
}

// ExeList returns the list of all executable packages.
func (meta debMetadata) ExeList() string {
    names := make([]string, len(meta.Executables))
    for i, e := range meta.Executables {
        names[i] = meta.ExeName(e)
    }
    return strings.Join(names, ", ")
}

// ExeName returns the package name of an executable package.
func (meta debMetadata) ExeName(exe debExecutable) string {
    if isUnstableBuild(meta.Env) {
        return exe.Name + "-unstable"
    }
    return exe.Name
}

// ExeConflicts returns the content of the Conflicts field
// for executable packages.
func (meta debMetadata) ExeConflicts(exe debExecutable) string {
    if isUnstableBuild(meta.Env) {
        // Set up the conflicts list so that the *-unstable packages
        // cannot be installed alongside the regular version.
        //
        // https://www.debian.org/doc/debian-policy/ch-relationships.html
        // is very explicit about Conflicts: and says that Breaks: should
        // be preferred and the conflicting files should be handled via
        // alternates. We might do this eventually but using a conflict is
        // easier now.
        return "ethereum, " + exe.Name
    }
    return ""
}

func stageDebianSource(tmpdir string, meta debMetadata) (pkgdir string) {
    pkg := meta.Name() + "-" + meta.VersionString()
    pkgdir = filepath.Join(tmpdir, pkg)
    if err := os.Mkdir(pkgdir, 0755); err != nil {
        log.Fatal(err)
    }

    // Copy the source code.
    build.MustRunCommand("git", "checkout-index", "-a", "--prefix", pkgdir+string(filepath.Separator))

    // Put the debian build files in place.
    debian := filepath.Join(pkgdir, "debian")
    build.Render("build/deb.rules", filepath.Join(debian, "rules"), 0755, meta)
    build.Render("build/deb.changelog", filepath.Join(debian, "changelog"), 0644, meta)
    build.Render("build/deb.control", filepath.Join(debian, "control"), 0644, meta)
    build.Render("build/deb.copyright", filepath.Join(debian, "copyright"), 0644, meta)
    build.RenderString("8\n", filepath.Join(debian, "compat"), 0644, meta)
    build.RenderString("3.0 (native)\n", filepath.Join(debian, "source/format"), 0644, meta)
    for _, exe := range meta.Executables {
        install := filepath.Join(debian, meta.ExeName(exe)+".install")
        docs := filepath.Join(debian, meta.ExeName(exe)+".docs")
        build.Render("build/deb.install", install, 0644, exe)
        build.Render("build/deb.docs", docs, 0644, exe)
    }

    return pkgdir
}

// Windows installer

func doWindowsInstaller(cmdline []string) {
    // Parse the flags and make skip installer generation on PRs
    var (
        arch    = flag.String("arch", runtime.GOARCH, "Architecture for cross build packaging")
        signer  = flag.String("signer", "", `Environment variable holding the signing key (e.g. WINDOWS_SIGNING_KEY)`)
        upload  = flag.String("upload", "", `Destination to upload the archives (usually "gethstore/builds")`)
        workdir = flag.String("workdir", "", `Output directory for packages (uses temp dir if unset)`)
    )
    flag.CommandLine.Parse(cmdline)
    *workdir = makeWorkdir(*workdir)
    env := build.Env()
    maybeSkipArchive(env)

    // Aggregate binaries that are included in the installer
    var (
        devTools []string
        allTools []string
        gethTool string
    )
    for _, file := range allToolsArchiveFiles {
        if file == "COPYING" { // license, copied later
            continue
        }
        allTools = append(allTools, filepath.Base(file))
        if filepath.Base(file) == "geth.exe" {
            gethTool = file
        } else {
            devTools = append(devTools, file)
        }
    }

    // Render NSIS scripts: Installer NSIS contains two installer sections,
    // first section contains the geth binary, second section holds the dev tools.
    templateData := map[string]interface{}{
        "License":  "COPYING",
        "Geth":     gethTool,
        "DevTools": devTools,
    }
    build.Render("build/nsis.geth.nsi", filepath.Join(*workdir, "geth.nsi"), 0644, nil)
    build.Render("build/nsis.install.nsh", filepath.Join(*workdir, "install.nsh"), 0644, templateData)
    build.Render("build/nsis.uninstall.nsh", filepath.Join(*workdir, "uninstall.nsh"), 0644, allTools)
    build.Render("build/nsis.envvarupdate.nsh", filepath.Join(*workdir, "EnvVarUpdate.nsh"), 0644, nil)
    build.CopyFile(filepath.Join(*workdir, "SimpleFC.dll"), "build/nsis.simplefc.dll", 0755)
    build.CopyFile(filepath.Join(*workdir, "COPYING"), "COPYING", 0755)

    // Build the installer. This assumes that all the needed files have been previously
    // built (don't mix building and packaging to keep cross compilation complexity to a
    // minimum).
    version := strings.Split(build.VERSION(), ".")
    if env.Commit != "" {
        version[2] += "-" + env.Commit[:8]
    }
    installer, _ := filepath.Abs("geth-" + archiveBasename(*arch, env) + ".exe")
    build.MustRunCommand("makensis.exe",
        "/DOUTPUTFILE="+installer,
        "/DMAJORVERSION="+version[0],
        "/DMINORVERSION="+version[1],
        "/DBUILDVERSION="+version[2],
        "/DARCH="+*arch,
        filepath.Join(*workdir, "geth.nsi"),
    )

    // Sign and publish installer.
    if err := archiveUpload(installer, *upload, *signer); err != nil {
        log.Fatal(err)
    }
}

// Cross compilation

func doXgo(cmdline []string) {
    flag.CommandLine.Parse(cmdline)
    env := build.Env()

    // Make sure xgo is available for cross compilation
    gogetxgo := goTool("get", "github.com/karalabe/xgo")
    build.MustRun(gogetxgo)

    // Execute the actual cross compilation
    xgo := xgoTool(append(buildFlags(env), flag.Args()...))
    build.MustRun(xgo)
}

func xgoTool(args []string) *exec.Cmd {
    cmd := exec.Command(filepath.Join(GOBIN, "xgo"), args...)
    cmd.Env = []string{
        "GOPATH=" + build.GOPATH(),
        "GOBIN=" + GOBIN,
    }
    for _, e := range os.Environ() {
        if strings.HasPrefix(e, "GOPATH=") || strings.HasPrefix(e, "GOBIN=") {
            continue
        }
        cmd.Env = append(cmd.Env, e)
    }
    return cmd
}