path: root/build/ci.go

// 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 build/ci.go <command> <command flags/arguments>

Available commands are:

   install    [ -arch architecture ] [ -cc compiler ] [ packages... ]                          -- builds packages and executables
   test       [ -coverage ] [ packages... ]                                                    -- runs the tests
   lint                                                                                        -- runs certain pre-selected linters
   archive    [ -arch architecture ] [ -type zip|tar ] [ -signer key-envvar ] [ -upload dest ] -- archives build artifacts
   importkeys                                                                                  -- imports signing keys from env
   debsrc     [ -signer key-id ] [ -upload dest ]                                              -- creates a debian source package
   nsis                                                                                        -- creates a Windows NSIS installer
   aar        [ -local ] [ -sign key-id ] [-deploy repo] [ -upload dest ]                      -- creates an Android archive
   xcode      [ -local ] [ -sign key-id ] [-deploy repo] [ -upload dest ]                      -- creates an iOS XCode framework
   xgo        [ -alltools ] [ options ]                                                        -- cross builds according to options
   purge      [ -store blobstore ] [ -days threshold ]                                         -- purges old archives from the blobstore

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

*/
package main

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

    "github.com/ethereum/go-ethereum/internal/build"
    "github.com/ethereum/go-ethereum/params"
    sv "github.com/ethereum/go-ethereum/swarm/version"
)

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("bootnode"),
        executablePath("evm"),
        executablePath("geth"),
        executablePath("puppeth"),
        executablePath("rlpdump"),
        executablePath("wnode"),
    }

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

    // A debian package is created for all executables listed here.
    debExecutables = []debExecutable{
        {
            BinaryName:  "abigen",
            Description: "Source code generator to convert Ethereum contract definitions into easy to use, compile-time type-safe Go packages.",
        },
        {
            BinaryName:  "bootnode",
            Description: "Ethereum bootnode.",
        },
        {
            BinaryName:  "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.",
        },
        {
            BinaryName:  "geth",
            Description: "Ethereum CLI client.",
        },
        {
            BinaryName:  "puppeth",
            Description: "Ethereum private network manager.",
        },
        {
            BinaryName:  "rlpdump",
            Description: "Developer utility tool that prints RLP structures.",
        },
        {
            BinaryName:  "wnode",
            Description: "Ethereum Whisper diagnostic tool",
        },
    }

    // A debian package is created for all executables listed here.
    debSwarmExecutables = []debExecutable{
        {
            BinaryName:  "swarm",
            PackageName: "ethereum-swarm",
            Description: "Ethereum Swarm daemon and tools",
        },
    }

    debEthereum = debPackage{
        Name:        "ethereum",
        Version:     params.Version,
        Executables: debExecutables,
    }

    debSwarm = debPackage{
        Name:        "ethereum-swarm",
        Version:     sv.Version,
        Executables: debSwarmExecutables,
    }

    // Debian meta packages to build and push to Ubuntu PPA
    debPackages = []debPackage{
        debSwarm,
        debEthereum,
    }

    // Packages to be cross-compiled by the xgo command
    allCrossCompiledArchiveFiles = append(allToolsArchiveFiles, swarmArchiveFiles...)

    // Distros for which packages are created.
    // Note: vivid is unsupported because there is no golang-1.6 package for it.
    // Note: wily is unsupported because it was officially deprecated on lanchpad.
    // Note: yakkety is unsupported because it was officially deprecated on lanchpad.
    // Note: zesty is unsupported because it was officially deprecated on lanchpad.
    // Note: artful is unsupported because it was officially deprecated on lanchpad.
    debDistros = []string{"trusty", "xenial", "bionic", "cosmic"}
)

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 "lint":
        doLint(os.Args[2:])
    case "archive":
        doArchive(os.Args[2:])
    case "debsrc":
        doDebianSource(os.Args[2:])
    case "nsis":
        doWindowsInstaller(os.Args[2:])
    case "aar":
        doAndroidArchive(os.Args[2:])
    case "xcode":
        doXCodeFramework(os.Args[2:])
    case "xgo":
        doXgo(os.Args[2:])
    case "purge":
        doPurge(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")
        cc   = flag.String("cc", "", "C compiler to cross build with")
    )
    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 !strings.Contains(runtime.Version(), "devel") {
        // Figure out the minor version number since we can't textually compare (1.10 < 1.9)
        var minor int
        fmt.Sscanf(strings.TrimPrefix(runtime.Version(), "go1."), "%d", &minor)

        if minor < 9 {
            log.Println("You have Go version", runtime.Version())
            log.Println("go-ethereum requires at least Go version 1.9 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()
    }
    packages = build.ExpandPackagesNoVendor(packages)

    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 previous 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, *cc, "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, *cc, "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) {
    var ld []string
    if env.Commit != "" {
        ld = append(ld, "-X", "main.gitCommit="+env.Commit)
    }
    if runtime.GOOS == "darwin" {
        ld = append(ld, "-s")
    }

    if len(ld) > 0 {
        flags = append(flags, "-ldflags", strings.Join(ld, " "))
    }
    return flags
}

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

func goToolArch(arch string, cc string, subcmd string, args ...string) *exec.Cmd {
    cmd := build.GoTool(subcmd, args...)
    cmd.Env = []string{"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)
    }
    if cc != "" {
        cmd.Env = append(cmd.Env, "CC="+cc)
    }
    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 (
        coverage = flag.Bool("coverage", false, "Whether to record code coverage")
    )
    flag.CommandLine.Parse(cmdline)
    env := build.Env()

    packages := []string{"./..."}
    if len(flag.CommandLine.Args()) > 0 {
        packages = flag.CommandLine.Args()
    }
    packages = build.ExpandPackagesNoVendor(packages)

    // Run analysis tools before the tests.
    build.MustRun(goTool("vet", packages...))

    // Run the actual tests.
    gotest := goTool("test", buildFlags(env)...)
    // 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)
}

// runs gometalinter on requested packages
func doLint(cmdline []string) {
    flag.CommandLine.Parse(cmdline)

    packages := []string{"./..."}
    if len(flag.CommandLine.Args()) > 0 {
        packages = flag.CommandLine.Args()
    }
    // Get metalinter and install all supported linters
    build.MustRun(goTool("get", "gopkg.in/alecthomas/gometalinter.v2"))
    build.MustRunCommand(filepath.Join(GOBIN, "gometalinter.v2"), "--install")

    // Run fast linters batched together
    configs := []string{
        "--vendor",
        "--tests",
        "--deadline=2m",
        "--disable-all",
        "--enable=goimports",
        "--enable=varcheck",
        "--enable=vet",
        "--enable=gofmt",
        "--enable=misspell",
        "--enable=goconst",
        "--min-occurrences=6", // for goconst
    }
    build.MustRunCommand(filepath.Join(GOBIN, "gometalinter.v2"), append(configs, packages...)...)

    // Run slow linters one by one
    for _, linter := range []string{"unconvert", "gosimple"} {
        configs = []string{"--vendor", "--tests", "--deadline=10m", "--disable-all", "--enable=" + linter}
        build.MustRunCommand(filepath.Join(GOBIN, "gometalinter.v2"), append(configs, packages...)...)
    }
}

// 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()

        basegeth = archiveBasename(*arch, params.ArchiveVersion(env.Commit))
        geth     = "geth-" + basegeth + ext
        alltools = "geth-alltools-" + basegeth + ext

        baseswarm = archiveBasename(*arch, sv.ArchiveVersion(env.Commit))
        swarm     = "swarm-" + baseswarm + 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)
    }
    if err := build.WriteArchive(swarm, swarmArchiveFiles); err != nil {
        log.Fatal(err)
    }
    for _, archive := range []string{geth, alltools, swarm} {
        if err := archiveUpload(archive, *upload, *signer); err != nil {
            log.Fatal(err)
        }
    }
}

func archiveBasename(arch string, archiveVersion string) string {
    platform := runtime.GOOS + "-" + arch
    if arch == "arm" {
        platform += os.Getenv("GOARM")
    }
    if arch == "android" {
        platform = "android-all"
    }
    if arch == "ios" {
        platform = "ios-all"
    }
    return platform + "-" + archiveVersion
}

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, filepath.Base(archive), auth); err != nil {
            return err
        }
        if signer != "" {
            if err := build.AzureBlobstoreUpload(archive+".asc", filepath.Base(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.IsCronJob {
        log.Printf("skipping because this is a cron job")
        os.Exit(0)
    }
    if env.Branch != "master" && !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 Debian packages and upload them
    for _, pkg := range debPackages {
        for _, distro := range debDistros {
            meta := newDebMetadata(distro, *signer, env, now, pkg.Name, pkg.Version, pkg.Executables)
            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.Tag != "" {
        return false
    }
    return true
}

type debPackage struct {
    Name        string          // the name of the Debian package to produce, e.g. "ethereum", or "ethereum-swarm"
    Version     string          // the clean version of the debPackage, e.g. 1.8.12 or 0.3.0, without any metadata
    Executables []debExecutable // executables to be included in the package
}

type debMetadata struct {
    Env build.Environment

    PackageName string

    // 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 {
    PackageName string
    BinaryName  string
    Description string
}

// Package returns the name of the package if present, or
// fallbacks to BinaryName
func (d debExecutable) Package() string {
    if d.PackageName != "" {
        return d.PackageName
    }
    return d.BinaryName
}

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

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

// 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.Package() + "-unstable"
    }
    return exe.Package()
}

// EthereumSwarmPackageName returns the name of the swarm package based on
// environment, e.g. "ethereum-swarm-unstable", or "ethereum-swarm".
// This is needed so that we make sure that "ethereum" package,
// depends on and installs "ethereum-swarm"
func (meta debMetadata) EthereumSwarmPackageName() string {
    if isUnstableBuild(meta.Env) {
        return debSwarm.Name + "-unstable"
    }
    return debSwarm.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.Package()
    }
    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/"+meta.PackageName+"/deb.rules", filepath.Join(debian, "rules"), 0755, meta)
    build.Render("build/deb/"+meta.PackageName+"/deb.changelog", filepath.Join(debian, "changelog"), 0644, meta)
    build.Render("build/deb/"+meta.PackageName+"/deb.control", filepath.Join(debian, "control"), 0644, meta)
    build.Render("build/deb/"+meta.PackageName+"/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/"+meta.PackageName+"/deb.install", install, 0644, exe)
        build.Render("build/deb/"+meta.PackageName+"/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.pathupdate.nsh", filepath.Join(*workdir, "PathUpdate.nsh"), 0644, nil)
    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(params.Version, ".")
    if env.Commit != "" {
        version[2] += "-" + env.Commit[:8]
    }
    installer, _ := filepath.Abs("geth-" + archiveBasename(*arch, params.ArchiveVersion(env.Commit)) + ".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)
    }
}

// Android archives

func doAndroidArchive(cmdline []string) {
    var (
        local  = flag.Bool("local", false, `Flag whether we're only doing a local build (skip Maven artifacts)`)
        signer = flag.String("signer", "", `Environment variable holding the signing key (e.g. ANDROID_SIGNING_KEY)`)
        deploy = flag.String("deploy", "", `Destination to deploy the archive (usually "https://oss.sonatype.org")`)
        upload = flag.String("upload", "", `Destination to upload the archive (usually "gethstore/builds")`)
    )
    flag.CommandLine.Parse(cmdline)
    env := build.Env()

    // Sanity check that the SDK and NDK are installed and set
    if os.Getenv("ANDROID_HOME") == "" {
        log.Fatal("Please ensure ANDROID_HOME points to your Android SDK")
    }
    if os.Getenv("ANDROID_NDK") == "" {
        log.Fatal("Please ensure ANDROID_NDK points to your Android NDK")
    }
    // Build the Android archive and Maven resources
    build.MustRun(goTool("get", "golang.org/x/mobile/cmd/gomobile", "golang.org/x/mobile/cmd/gobind"))
    build.MustRun(gomobileTool("init", "--ndk", os.Getenv("ANDROID_NDK")))
    build.MustRun(gomobileTool("bind", "-ldflags", "-s -w", "--target", "android", "--javapkg", "org.ethereum", "-v", "github.com/ethereum/go-ethereum/mobile"))

    if *local {
        // If we're building locally, copy bundle to build dir and skip Maven
        os.Rename("geth.aar", filepath.Join(GOBIN, "geth.aar"))
        return
    }
    meta := newMavenMetadata(env)
    build.Render("build/mvn.pom", meta.Package+".pom", 0755, meta)

    // Skip Maven deploy and Azure upload for PR builds
    maybeSkipArchive(env)

    // Sign and upload the archive to Azure
    archive := "geth-" + archiveBasename("android", params.ArchiveVersion(env.Commit)) + ".aar"
    os.Rename("geth.aar", archive)

    if err := archiveUpload(archive, *upload, *signer); err != nil {
        log.Fatal(err)
    }
    // Sign and upload all the artifacts to Maven Central
    os.Rename(archive, meta.Package+".aar")
    if *signer != "" && *deploy != "" {
        // Import the signing key into the local GPG instance
        b64key := os.Getenv(*signer)
        key, err := base64.StdEncoding.DecodeString(b64key)
        if err != nil {
            log.Fatalf("invalid base64 %s", *signer)
        }
        gpg := exec.Command("gpg", "--import")
        gpg.Stdin = bytes.NewReader(key)
        build.MustRun(gpg)

        keyID, err := build.PGPKeyID(string(key))
        if err != nil {
            log.Fatal(err)
        }
        // Upload the artifacts to Sonatype and/or Maven Central
        repo := *deploy + "/service/local/staging/deploy/maven2"
        if meta.Develop {
            repo = *deploy + "/content/repositories/snapshots"
        }
        build.MustRunCommand("mvn", "gpg:sign-and-deploy-file", "-e", "-X",
            "-settings=build/mvn.settings", "-Durl="+repo, "-DrepositoryId=ossrh",
            "-Dgpg.keyname="+keyID,
            "-DpomFile="+meta.Package+".pom", "-Dfile="+meta.Package+".aar")
    }
}

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

type mavenMetadata struct {
    Version      string
    Package      string
    Develop      bool
    Contributors []mavenContributor
}

type mavenContributor struct {
    Name  string
    Email string
}

func newMavenMetadata(env build.Environment) mavenMetadata {
    // Collect the list of authors from the repo root
    contribs := []mavenContributor{}
    if authors, err := os.Open("AUTHORS"); err == nil {
        defer authors.Close()

        scanner := bufio.NewScanner(authors)
        for scanner.Scan() {
            // Skip any whitespace from the authors list
            line := strings.TrimSpace(scanner.Text())
            if line == "" || line[0] == '#' {
                continue
            }
            // Split the author and insert as a contributor
            re := regexp.MustCompile("([^<]+) <(.+)>")
            parts := re.FindStringSubmatch(line)
            if len(parts) == 3 {
                contribs = append(contribs, mavenContributor{Name: parts[1], Email: parts[2]})
            }
        }
    }
    // Render the version and package strings
    version := params.Version
    if isUnstableBuild(env) {
        version += "-SNAPSHOT"
    }
    return mavenMetadata{
        Version:      version,
        Package:      "geth-" + version,
        Develop:      isUnstableBuild(env),
        Contributors: contribs,
    }
}

// XCode frameworks

func doXCodeFramework(cmdline []string) {
    var (
        local  = flag.Bool("local", false, `Flag whether we're only doing a local build (skip Maven artifacts)`)
        signer = flag.String("signer", "", `Environment variable holding the signing key (e.g. IOS_SIGNING_KEY)`)
        deploy = flag.String("deploy", "", `Destination to deploy the archive (usually "trunk")`)
        upload = flag.String("upload", "", `Destination to upload the archives (usually "gethstore/builds")`)
    )
    flag.CommandLine.Parse(cmdline)
    env := build.Env()

    // Build the iOS XCode framework
    build.MustRun(goTool("get", "golang.org/x/mobile/cmd/gomobile", "golang.org/x/mobile/cmd/gobind"))
    build.MustRun(gomobileTool("init"))
    bind := gomobileTool("bind", "-ldflags", "-s -w", "--target", "ios", "--tags", "ios", "-v", "github.com/ethereum/go-ethereum/mobile")

    if *local {
        // If we're building locally, use the build folder and stop afterwards
        bind.Dir, _ = filepath.Abs(GOBIN)
        build.MustRun(bind)
        return
    }
    archive := "geth-" + archiveBasename("ios", params.ArchiveVersion(env.Commit))
    if err := os.Mkdir(archive, os.ModePerm); err != nil {
        log.Fatal(err)
    }
    bind.Dir, _ = filepath.Abs(archive)
    build.MustRun(bind)
    build.MustRunCommand("tar", "-zcvf", archive+".tar.gz", archive)

    // Skip CocoaPods deploy and Azure upload for PR builds
    maybeSkipArchive(env)

    // Sign and upload the framework to Azure
    if err := archiveUpload(archive+".tar.gz", *upload, *signer); err != nil {
        log.Fatal(err)
    }
    // Prepare and upload a PodSpec to CocoaPods
    if *deploy != "" {
        meta := newPodMetadata(env, archive)
        build.Render("build/pod.podspec", "Geth.podspec", 0755, meta)
        build.MustRunCommand("pod", *deploy, "push", "Geth.podspec", "--allow-warnings", "--verbose")
    }
}

type podMetadata struct {
    Version      string
    Commit       string
    Archive      string
    Contributors []podContributor
}

type podContributor struct {
    Name  string
    Email string
}

func newPodMetadata(env build.Environment, archive string) podMetadata {
    // Collect the list of authors from the repo root
    contribs := []podContributor{}
    if authors, err := os.Open("AUTHORS"); err == nil {
        defer authors.Close()

        scanner := bufio.NewScanner(authors)
        for scanner.Scan() {
            // Skip any whitespace from the authors list
            line := strings.TrimSpace(scanner.Text())
            if line == "" || line[0] == '#' {
                continue
            }
            // Split the author and insert as a contributor
            re := regexp.MustCompile("([^<]+) <(.+)>")
            parts := re.FindStringSubmatch(line)
            if len(parts) == 3 {
                contribs = append(contribs, podContributor{Name: parts[1], Email: parts[2]})
            }
        }
    }
    version := params.Version
    if isUnstableBuild(env) {
        version += "-unstable." + env.Buildnum
    }
    return podMetadata{
        Archive:      archive,
        Version:      version,
        Commit:       env.Commit,
        Contributors: contribs,
    }
}

// Cross compilation

func doXgo(cmdline []string) {
    var (
        alltools = flag.Bool("alltools", false, `Flag whether we're building all known tools, or only on in particular`)
    )
    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)

    // If all tools building is requested, build everything the builder wants
    args := append(buildFlags(env), flag.Args()...)

    if *alltools {
        args = append(args, []string{"--dest", GOBIN}...)
        for _, res := range allCrossCompiledArchiveFiles {
            if strings.HasPrefix(res, GOBIN) {
                // Binary tool found, cross build it explicitly
                args = append(args, "./"+filepath.Join("cmd", filepath.Base(res)))
                xgo := xgoTool(args)
                build.MustRun(xgo)
                args = args[:len(args)-1]
            }
        }
        return
    }
    // Otherwise xxecute the explicit cross compilation
    path := args[len(args)-1]
    args = append(args[:len(args)-1], []string{"--dest", GOBIN, path}...)

    xgo := xgoTool(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
}

// Binary distribution cleanups

func doPurge(cmdline []string) {
    var (
        store = flag.String("store", "", `Destination from where to purge archives (usually "gethstore/builds")`)
        limit = flag.Int("days", 30, `Age threshold above which to delete unstalbe archives`)
    )
    flag.CommandLine.Parse(cmdline)

    if env := build.Env(); !env.IsCronJob {
        log.Printf("skipping because not a cron job")
        os.Exit(0)
    }
    // Create the azure authentication and list the current archives
    auth := build.AzureBlobstoreConfig{
        Account:   strings.Split(*store, "/")[0],
        Token:     os.Getenv("AZURE_BLOBSTORE_TOKEN"),
        Container: strings.SplitN(*store, "/", 2)[1],
    }
    blobs, err := build.AzureBlobstoreList(auth)
    if err != nil {
        log.Fatal(err)
    }
    // Iterate over the blobs, collect and sort all unstable builds
    for i := 0; i < len(blobs); i++ {
        if !strings.Contains(blobs[i].Name, "unstable") {
            blobs = append(blobs[:i], blobs[i+1:]...)
            i--
        }
    }
    for i := 0; i < len(blobs); i++ {
        for j := i + 1; j < len(blobs); j++ {
            if blobs[i].Properties.LastModified.After(blobs[j].Properties.LastModified) {
                blobs[i], blobs[j] = blobs[j], blobs[i]
            }
        }
    }
    // Filter out all archives more recent that the given threshold
    for i, blob := range blobs {
        if time.Since(blob.Properties.LastModified) < time.Duration(*limit)*24*time.Hour {
            blobs = blobs[:i]
            break
        }
    }
    // Delete all marked as such and return
    if err := build.AzureBlobstoreDelete(auth, blobs); err != nil {
        log.Fatal(err)
    }
}