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// Copyright 2023 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Distpack creates the tgz and zip files for a Go distribution.
// It writes into GOROOT/pkg/distpack:
//
// - a binary distribution (tgz or zip) for the current GOOS and GOARCH
// - a source distribution that is independent of GOOS/GOARCH
// - the module mod, info, and zip files for a distribution in module form
// (as used by GOTOOLCHAIN support in the go command).
//
// Distpack is typically invoked by the -distpack flag to make.bash.
// A cross-compiled distribution for goos/goarch can be built using:
//
// GOOS=goos GOARCH=goarch ./make.bash -distpack
//
// To test that the module downloads are usable with the go command:
//
// ./make.bash -distpack
// mkdir -p /tmp/goproxy/golang.org/toolchain/
// ln -sf $(pwd)/../pkg/distpack /tmp/goproxy/golang.org/toolchain/@v
// GOPROXY=file:///tmp/goproxy GOTOOLCHAIN=$(sed 1q ../VERSION) gotip version
//
// gotip can be replaced with an older released Go version once there is one.
// It just can't be the one make.bash built, because it knows it is already that
// version and will skip the download.
package main
import (
"archive/tar"
"archive/zip"
"compress/flate"
"compress/gzip"
"crypto/sha256"
"flag"
"fmt"
"io"
"io/fs"
"log"
"os"
"path"
"path/filepath"
"runtime"
"strings"
"time"
)
func usage() {
fmt.Fprintf(os.Stderr, "usage: distpack\n")
os.Exit(2)
}
const (
modPath = "golang.org/toolchain"
modVersionPrefix = "v0.0.1"
)
var (
goroot string
gohostos string
gohostarch string
goos string
goarch string
)
func main() {
log.SetPrefix("distpack: ")
log.SetFlags(0)
flag.Usage = usage
flag.Parse()
if flag.NArg() != 0 {
usage()
}
// Load context.
goroot = runtime.GOROOT()
if goroot == "" {
log.Fatalf("missing $GOROOT")
}
gohostos = runtime.GOOS
gohostarch = runtime.GOARCH
goos = os.Getenv("GOOS")
if goos == "" {
goos = gohostos
}
goarch = os.Getenv("GOARCH")
if goarch == "" {
goarch = gohostarch
}
goosUnderGoarch := goos + "_" + goarch
goosDashGoarch := goos + "-" + goarch
exe := ""
if goos == "windows" {
exe = ".exe"
}
version, versionTime := readVERSION(goroot)
// Start with files from GOROOT, filtering out non-distribution files.
base, err := NewArchive(goroot)
if err != nil {
log.Fatal(err)
}
base.SetTime(versionTime)
base.SetMode(mode)
base.Remove(
".git/**",
".gitattributes",
".github/**",
".gitignore",
"VERSION.cache",
"misc/cgo/*/_obj/**",
"**/.DS_Store",
"**/*.exe~", // go.dev/issue/23894
// Generated during make.bat/make.bash.
"src/cmd/dist/dist",
"src/cmd/dist/dist.exe",
)
// The source distribution removes files generated during the release build.
// See ../dist/build.go's deptab.
srcArch := base.Clone()
srcArch.Remove(
"bin/**",
"pkg/**",
// Generated during cmd/dist. See ../dist/build.go:/gentab.
"src/cmd/go/internal/cfg/zdefaultcc.go",
"src/go/build/zcgo.go",
"src/runtime/internal/sys/zversion.go",
"src/time/tzdata/zzipdata.go",
// Generated during cmd/dist by bootstrapBuildTools.
"src/cmd/cgo/zdefaultcc.go",
"src/cmd/internal/objabi/zbootstrap.go",
"src/internal/buildcfg/zbootstrap.go",
// Generated by earlier versions of cmd/dist .
"src/cmd/go/internal/cfg/zosarch.go",
)
srcArch.AddPrefix("go")
testSrc(srcArch)
// The binary distribution includes only a subset of bin and pkg.
binArch := base.Clone()
binArch.Filter(func(name string) bool {
// Discard bin/ for now, will add back later.
if strings.HasPrefix(name, "bin/") {
return false
}
// Discard most of pkg.
if strings.HasPrefix(name, "pkg/") {
// Keep pkg/include.
if strings.HasPrefix(name, "pkg/include/") {
return true
}
// Discard other pkg except pkg/tool.
if !strings.HasPrefix(name, "pkg/tool/") {
return false
}
// Inside pkg/tool, keep only $GOOS_$GOARCH.
if !strings.HasPrefix(name, "pkg/tool/"+goosUnderGoarch+"/") {
return false
}
// Inside pkg/tool/$GOOS_$GOARCH, discard helper tools.
switch strings.TrimSuffix(path.Base(name), ".exe") {
case "api", "dist", "distpack", "metadata":
return false
}
}
return true
})
// Add go and gofmt to bin, using cross-compiled binaries
// if this is a cross-compiled distribution.
binExes := []string{
"go",
"gofmt",
}
crossBin := "bin"
if goos != gohostos || goarch != gohostarch {
crossBin = "bin/" + goosUnderGoarch
}
for _, b := range binExes {
name := "bin/" + b + exe
src := filepath.Join(goroot, crossBin, b+exe)
info, err := os.Stat(src)
if err != nil {
log.Fatal(err)
}
binArch.Add(name, src, info)
}
binArch.Sort()
binArch.SetTime(versionTime) // fix added files
binArch.SetMode(mode) // fix added files
zipArch := binArch.Clone()
zipArch.AddPrefix("go")
testZip(zipArch)
// The module distribution is the binary distribution with unnecessary files removed
// and file names using the necessary prefix for the module.
modArch := binArch.Clone()
modArch.Remove(
"api/**",
"doc/**",
"misc/**",
"test/**",
)
modVers := modVersionPrefix + "-" + version + "." + goosDashGoarch
modArch.AddPrefix(modPath + "@" + modVers)
modArch.RenameGoMod()
modArch.Sort()
testMod(modArch)
// distpack returns the full path to name in the distpack directory.
distpack := func(name string) string {
return filepath.Join(goroot, "pkg/distpack", name)
}
if err := os.MkdirAll(filepath.Join(goroot, "pkg/distpack"), 0777); err != nil {
log.Fatal(err)
}
writeTgz(distpack(version+".src.tar.gz"), srcArch)
if goos == "windows" {
writeZip(distpack(version+"."+goos+"-"+goarch+".zip"), zipArch)
} else {
writeTgz(distpack(version+"."+goos+"-"+goarch+".tar.gz"), zipArch)
}
writeZip(distpack(modVers+".zip"), modArch)
writeFile(distpack(modVers+".mod"),
[]byte(fmt.Sprintf("module %s\n", modPath)))
writeFile(distpack(modVers+".info"),
[]byte(fmt.Sprintf("{%q:%q, %q:%q}\n",
"Version", modVers,
"Time", versionTime.Format(time.RFC3339))))
}
// mode computes the mode for the given file name.
func mode(name string, _ fs.FileMode) fs.FileMode {
if strings.HasPrefix(name, "bin/") ||
strings.HasPrefix(name, "pkg/tool/") ||
strings.HasSuffix(name, ".bash") ||
strings.HasSuffix(name, ".sh") ||
strings.HasSuffix(name, ".pl") ||
strings.HasSuffix(name, ".rc") {
return 0o755
} else if ok, _ := amatch("**/go_?*_?*_exec", name); ok {
return 0o755
}
return 0o644
}
// readVERSION reads the VERSION file.
// The first line of the file is the Go version.
// Additional lines are 'key value' pairs setting other data.
// The only valid key at the moment is 'time', which sets the modification time for file archives.
func readVERSION(goroot string) (version string, t time.Time) {
data, err := os.ReadFile(filepath.Join(goroot, "VERSION"))
if err != nil {
log.Fatal(err)
}
version, rest, _ := strings.Cut(string(data), "\n")
for _, line := range strings.Split(rest, "\n") {
f := strings.Fields(line)
if len(f) == 0 {
continue
}
switch f[0] {
default:
log.Fatalf("VERSION: unexpected line: %s", line)
case "time":
if len(f) != 2 {
log.Fatalf("VERSION: unexpected time line: %s", line)
}
t, err = time.ParseInLocation(time.RFC3339, f[1], time.UTC)
if err != nil {
log.Fatalf("VERSION: bad time: %s", err)
}
}
}
return version, t
}
// writeFile writes a file with the given name and data or fatals.
func writeFile(name string, data []byte) {
if err := os.WriteFile(name, data, 0666); err != nil {
log.Fatal(err)
}
reportHash(name)
}
// check panics if err is not nil. Otherwise it returns x.
// It is only meant to be used in a function that has deferred
// a function to recover appropriately from the panic.
func check[T any](x T, err error) T {
check1(err)
return x
}
// check1 panics if err is not nil.
// It is only meant to be used in a function that has deferred
// a function to recover appropriately from the panic.
func check1(err error) {
if err != nil {
panic(err)
}
}
// writeTgz writes the archive in tgz form to the file named name.
func writeTgz(name string, a *Archive) {
out, err := os.Create(name)
if err != nil {
log.Fatal(err)
}
var f File
defer func() {
if err := recover(); err != nil {
extra := ""
if f.Name != "" {
extra = " " + f.Name
}
log.Fatalf("writing %s%s: %v", name, extra, err)
}
}()
zw := check(gzip.NewWriterLevel(out, gzip.BestCompression))
tw := tar.NewWriter(zw)
// Find the mode and mtime to use for directory entries,
// based on the mode and mtime of the first file we see.
// We know that modes and mtimes are uniform across the archive.
var dirMode fs.FileMode
var mtime time.Time
for _, f := range a.Files {
dirMode = fs.ModeDir | f.Mode | (f.Mode&0444)>>2 // copy r bits down to x bits
mtime = f.Time
break
}
// mkdirAll ensures that the tar file contains directory
// entries for dir and all its parents. Some programs reading
// these tar files expect that. See go.dev/issue/61862.
haveDir := map[string]bool{".": true}
var mkdirAll func(string)
mkdirAll = func(dir string) {
if dir == "/" {
panic("mkdirAll /")
}
if haveDir[dir] {
return
}
haveDir[dir] = true
mkdirAll(path.Dir(dir))
df := &File{
Name: dir + "/",
Time: mtime,
Mode: dirMode,
}
h := check(tar.FileInfoHeader(df.Info(), ""))
h.Name = dir + "/"
if err := tw.WriteHeader(h); err != nil {
panic(err)
}
}
for _, f = range a.Files {
h := check(tar.FileInfoHeader(f.Info(), ""))
mkdirAll(path.Dir(f.Name))
h.Name = f.Name
if err := tw.WriteHeader(h); err != nil {
panic(err)
}
r := check(os.Open(f.Src))
check(io.Copy(tw, r))
check1(r.Close())
}
f.Name = ""
check1(tw.Close())
check1(zw.Close())
check1(out.Close())
reportHash(name)
}
// writeZip writes the archive in zip form to the file named name.
func writeZip(name string, a *Archive) {
out, err := os.Create(name)
if err != nil {
log.Fatal(err)
}
var f File
defer func() {
if err := recover(); err != nil {
extra := ""
if f.Name != "" {
extra = " " + f.Name
}
log.Fatalf("writing %s%s: %v", name, extra, err)
}
}()
zw := zip.NewWriter(out)
zw.RegisterCompressor(zip.Deflate, func(out io.Writer) (io.WriteCloser, error) {
return flate.NewWriter(out, flate.BestCompression)
})
for _, f = range a.Files {
h := check(zip.FileInfoHeader(f.Info()))
h.Name = f.Name
h.Method = zip.Deflate
w := check(zw.CreateHeader(h))
r := check(os.Open(f.Src))
check(io.Copy(w, r))
check1(r.Close())
}
f.Name = ""
check1(zw.Close())
check1(out.Close())
reportHash(name)
}
func reportHash(name string) {
f, err := os.Open(name)
if err != nil {
log.Fatal(err)
}
h := sha256.New()
io.Copy(h, f)
f.Close()
fmt.Printf("distpack: %x %s\n", h.Sum(nil)[:8], filepath.Base(name))
}