// Copyright 2012 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.
package main
import (
"bytes"
"encoding/json"
"flag"
"fmt"
"io/ioutil"
"log"
"os"
"os/exec"
"path/filepath"
"sort"
"strings"
"sync"
"time"
)
// Initialization for any invocation.
// The usual variables.
var (
goarch string
gobin string
gohostarch string
gohostos string
goos string
goarm string
go386 string
gomips string
gomips64 string
goppc64 string
goroot string
goroot_final string
goextlinkenabled string
gogcflags string // For running built compiler
goldflags string
workdir string
tooldir string
oldgoos string
oldgoarch string
exe string
defaultcc map[string]string
defaultcxx map[string]string
defaultcflags string
defaultldflags string
defaultpkgconfig string
defaultldso string
rebuildall bool
defaultclang bool
vflag int // verbosity
)
// The known architectures.
var okgoarch = []string{
"386",
"amd64",
"amd64p32",
"arm",
"arm64",
"mips",
"mipsle",
"mips64",
"mips64le",
"ppc64",
"ppc64le",
"riscv64",
"s390x",
"sparc64",
"wasm",
}
// The known operating systems.
var okgoos = []string{
"darwin",
"dragonfly",
"illumos",
"js",
"linux",
"android",
"solaris",
"freebsd",
"nacl",
"netbsd",
"openbsd",
"plan9",
"windows",
"aix",
}
// find reports the first index of p in l[0:n], or else -1.
func find(p string, l []string) int {
for i, s := range l {
if p == s {
return i
}
}
return -1
}
// xinit handles initialization of the various global state, like goroot and goarch.
func xinit() {
b := os.Getenv("GOROOT")
if b == "" {
fatalf("$GOROOT must be set")
}
goroot = filepath.Clean(b)
b = os.Getenv("GOROOT_FINAL")
if b == "" {
b = goroot
}
goroot_final = b
b = os.Getenv("GOBIN")
if b == "" {
b = pathf("%s/bin", goroot)
}
gobin = b
b = os.Getenv("GOOS")
if b == "" {
b = gohostos
}
goos = b
if find(goos, okgoos) < 0 {
fatalf("unknown $GOOS %s", goos)
}
b = os.Getenv("GOARM")
if b == "" {
b = xgetgoarm()
}
goarm = b
b = os.Getenv("GO386")
if b == "" {
if cansse2() {
b = "sse2"
} else {
b = "387"
}
}
go386 = b
b = os.Getenv("GOMIPS")
if b == "" {
b = "hardfloat"
}
gomips = b
b = os.Getenv("GOMIPS64")
if b == "" {
b = "hardfloat"
}
gomips64 = b
b = os.Getenv("GOPPC64")
if b == "" {
b = "power8"
}
goppc64 = b
if p := pathf("%s/src/all.bash", goroot); !isfile(p) {
fatalf("$GOROOT is not set correctly or not exported\n"+
"\tGOROOT=%s\n"+
"\t%s does not exist", goroot, p)
}
b = os.Getenv("GOHOSTARCH")
if b != "" {
gohostarch = b
}
if find(gohostarch, okgoarch) < 0 {
fatalf("unknown $GOHOSTARCH %s", gohostarch)
}
b = os.Getenv("GOARCH")
if b == "" {
b = gohostarch
}
goarch = b
if find(goarch, okgoarch) < 0 {
fatalf("unknown $GOARCH %s", goarch)
}
b = os.Getenv("GO_EXTLINK_ENABLED")
if b != "" {
if b != "0" && b != "1" {
fatalf("unknown $GO_EXTLINK_ENABLED %s", b)
}
goextlinkenabled = b
}
gogcflags = os.Getenv("BOOT_GO_GCFLAGS")
goldflags = os.Getenv("BOOT_GO_LDFLAGS")
cc, cxx := "gcc", "g++"
if defaultclang {
cc, cxx = "clang", "clang++"
}
defaultcc = compilerEnv("CC", cc)
defaultcxx = compilerEnv("CXX", cxx)
defaultcflags = os.Getenv("CFLAGS")
defaultldflags = os.Getenv("LDFLAGS")
b = os.Getenv("PKG_CONFIG")
if b == "" {
b = "pkg-config"
}
defaultpkgconfig = b
defaultldso = os.Getenv("GO_LDSO")
// For tools being invoked but also for os.ExpandEnv.
os.Setenv("GO386", go386)
os.Setenv("GOARCH", goarch)
os.Setenv("GOARM", goarm)
os.Setenv("GOHOSTARCH", gohostarch)
os.Setenv("GOHOSTOS", gohostos)
os.Setenv("GOOS", goos)
os.Setenv("GOMIPS", gomips)
os.Setenv("GOMIPS64", gomips64)
os.Setenv("GOPPC64", goppc64)
os.Setenv("GOROOT", goroot)
os.Setenv("GOROOT_FINAL", goroot_final)
// Use a build cache separate from the default user one.
// Also one that will be wiped out during startup, so that
// make.bash really does start from a clean slate.
os.Setenv("GOCACHE", pathf("%s/pkg/obj/go-build", goroot))
// Make the environment more predictable.
os.Setenv("LANG", "C")
os.Setenv("LANGUAGE", "en_US.UTF8")
workdir = xworkdir()
xatexit(rmworkdir)
tooldir = pathf("%s/pkg/tool/%s_%s", goroot, gohostos, gohostarch)
}
// compilerEnv returns a map from "goos/goarch" to the
// compiler setting to use for that platform.
// The entry for key "" covers any goos/goarch not explicitly set in the map.
// For example, compilerEnv("CC", "gcc") returns the C compiler settings
// read from $CC, defaulting to gcc.
//
// The result is a map because additional environment variables
// can be set to change the compiler based on goos/goarch settings.
// The following applies to all envNames but CC is assumed to simplify
// the presentation.
//
// If no environment variables are set, we use def for all goos/goarch.
// $CC, if set, applies to all goos/goarch but is overridden by the following.
// $CC_FOR_TARGET, if set, applies to all goos/goarch except gohostos/gohostarch,
// but is overridden by the following.
// If gohostos=goos and gohostarch=goarch, then $CC_FOR_TARGET applies even for gohostos/gohostarch.
// $CC_FOR_goos_goarch, if set, applies only to goos/goarch.
func compilerEnv(envName, def string) map[string]string {
m := map[string]string{"": def}
if env := os.Getenv(envName); env != "" {
m[""] = env
}
if env := os.Getenv(envName + "_FOR_TARGET"); env != "" {
if gohostos != goos || gohostarch != goarch {
m[gohostos+"/"+gohostarch] = m[""]
}
m[""] = env
}
for _, goos := range okgoos {
for _, goarch := range okgoarch {
if env := os.Getenv(envName + "_FOR_" + goos + "_" + goarch); env != "" {
m[goos+"/"+goarch] = env
}
}
}
return m
}
// compilerEnvLookup returns the compiler settings for goos/goarch in map m.
func compilerEnvLookup(m map[string]string, goos, goarch string) string {
if cc := m[goos+"/"+goarch]; cc != "" {
return cc
}
return m[""]
}
// rmworkdir deletes the work directory.
func rmworkdir() {
if vflag > 1 {
errprintf("rm -rf %s\n", workdir)
}
xremoveall(workdir)
}
// Remove trailing spaces.
func chomp(s string) string {
return strings.TrimRight(s, " \t\r\n")
}
func branchtag(branch string) (tag string, precise bool) {
log := run(goroot, CheckExit, "git", "log", "--decorate=full", "--format=format:%d", "master.."+branch)
tag = branch
for row, line := range strings.Split(log, "\n") {
// Each line is either blank, or looks like
// (tag: refs/tags/go1.4rc2, refs/remotes/origin/release-branch.go1.4, refs/heads/release-branch.go1.4)
// We need to find an element starting with refs/tags/.
const s = " refs/tags/"
i := strings.Index(line, s)
if i < 0 {
continue
}
// Trim off known prefix.
line = line[i+len(s):]
// The tag name ends at a comma or paren.
j := strings.IndexAny(line, ",)")
if j < 0 {
continue // malformed line; ignore it
}
tag = line[:j]
if row == 0 {
precise = true // tag denotes HEAD
}
break
}
return
}
// findgoversion determines the Go version to use in the version string.
func findgoversion() string {
// The $GOROOT/VERSION file takes priority, for distributions
// without the source repo.
path := pathf("%s/VERSION", goroot)
if isfile(path) {
b := chomp(readfile(path))
// Commands such as "dist version > VERSION" will cause
// the shell to create an empty VERSION file and set dist's
// stdout to its fd. dist in turn looks at VERSION and uses
// its content if available, which is empty at this point.
// Only use the VERSION file if it is non-empty.
if b != "" {
// Some builders cross-compile the toolchain on linux-amd64
// and then copy the toolchain to the target builder (say, linux-arm)
// for use there. But on non-release (devel) branches, the compiler
// used on linux-amd64 will be an amd64 binary, and the compiler
// shipped to linux-arm will be an arm binary, so they will have different
// content IDs (they are binaries for different architectures) and so the
// packages compiled by the running-on-amd64 compiler will appear
// stale relative to the running-on-arm compiler. Avoid this by setting
// the version string to something that doesn't begin with devel.
// Then the version string will be used in place of the content ID,
// and the packages will look up-to-date.
// TODO(rsc): Really the builders could be writing out a better VERSION file instead,
// but it is easier to change cmd/dist than to try to make changes to
// the builder while Brad is away.
if strings.HasPrefix(b, "devel") {
if hostType := os.Getenv("META_BUILDLET_HOST_TYPE"); strings.Contains(hostType, "-cross") {
fmt.Fprintf(os.Stderr, "warning: changing VERSION from %q to %q\n", b, "builder "+hostType)
b = "builder " + hostType
}
}
return b
}
}
// The $GOROOT/VERSION.cache file is a cache to avoid invoking
// git every time we run this command. Unlike VERSION, it gets
// deleted by the clean command.
path = pathf("%s/VERSION.cache", goroot)
if isfile(path) {
return chomp(readfile(path))
}
// Show a nicer error message if this isn't a Git repo.
if !isGitRepo() {
fatalf("FAILED: not a Git repo; must put a VERSION file in $GOROOT")
}
// Otherwise, use Git.
// What is the current branch?
branch := chomp(run(goroot, CheckExit, "git", "rev-parse", "--abbrev-ref", "HEAD"))
// What are the tags along the current branch?
tag := "devel"
precise := false
// If we're on a release branch, use the closest matching tag
// that is on the release branch (and not on the master branch).
if strings.HasPrefix(branch, "release-branch.") {
tag, precise = branchtag(branch)
}
if !precise {
// Tag does not point at HEAD; add hash and date to version.
tag += chomp(run(goroot, CheckExit, "git", "log", "-n", "1", "--format=format: +%h %cd", "HEAD"))
}
// Cache version.
writefile(tag, path, 0)
return tag
}
// isGitRepo reports whether the working directory is inside a Git repository.
func isGitRepo() bool {
// NB: simply checking the exit code of `git rev-parse --git-dir` would
// suffice here, but that requires deviating from the infrastructure
// provided by `run`.
gitDir := chomp(run(goroot, 0, "git", "rev-parse", "--git-dir"))
if !filepath.IsAbs(gitDir) {
gitDir = filepath.Join(goroot, gitDir)
}
return isdir(gitDir)
}
/*
* Initial tree setup.
*/
// The old tools that no longer live in $GOBIN or $GOROOT/bin.
var oldtool = []string{
"5a", "5c", "5g", "5l",
"6a", "6c", "6g", "6l",
"8a", "8c", "8g", "8l",
"9a", "9c", "9g", "9l",
"6cov",
"6nm",
"6prof",
"cgo",
"ebnflint",
"goapi",
"gofix",
"goinstall",
"gomake",
"gopack",
"gopprof",
"gotest",
"gotype",
"govet",
"goyacc",
"quietgcc",
}
// Unreleased directories (relative to $GOROOT) that should
// not be in release branches.
var unreleased = []string{
"src/cmd/newlink",
"src/cmd/objwriter",
"src/debug/goobj",
"src/old",
}
// setup sets up the tree for the initial build.
func setup() {
// Create bin directory.
if p := pathf("%s/bin", goroot); !isdir(p) {
xmkdir(p)
}
// Create package directory.
if p := pathf("%s/pkg", goroot); !isdir(p) {
xmkdir(p)
}
p := pathf("%s/pkg/%s_%s", goroot, gohostos, gohostarch)
if rebuildall {
xremoveall(p)
}
xmkdirall(p)
if goos != gohostos || goarch != gohostarch {
p := pathf("%s/pkg/%s_%s", goroot, goos, goarch)
if rebuildall {
xremoveall(p)
}
xmkdirall(p)
}
// Create object directory.
// We used to use it for C objects.
// Now we use it for the build cache, to separate dist's cache
// from any other cache the user might have.
p = pathf("%s/pkg/obj/go-build", goroot)
if rebuildall {
xremoveall(p)
}
xmkdirall(p)
xatexit(func() { xremoveall(p) })
// Create tool directory.
// We keep it in pkg/, just like the object directory above.
if rebuildall {
xremoveall(tooldir)
}
xmkdirall(tooldir)
// Remove tool binaries from before the tool/gohostos_gohostarch
xremoveall(pathf("%s/bin/tool", goroot))
// Remove old pre-tool binaries.
for _, old := range oldtool {
xremove(pathf("%s/bin/%s", goroot, old))
}
// If $GOBIN is set and has a Go compiler, it must be cleaned.
for _, char := range "56789" {
if isfile(pathf("%s/%c%s", gobin, char, "g")) {
for _, old := range oldtool {
xremove(pathf("%s/%s", gobin, old))
}
break
}
}
// For release, make sure excluded things are excluded.
goversion := findgoversion()
if strings.HasPrefix(goversion, "release.") || (strings.HasPrefix(goversion, "go") && !strings.Contains(goversion, "beta")) {
for _, dir := range unreleased {
if p := pathf("%s/%s", goroot, dir); isdir(p) {
fatalf("%s should not exist in release build", p)
}
}
}
}
/*
* Tool building
*/
// deptab lists changes to the default dependencies for a given prefix.
// deps ending in /* read the whole directory; deps beginning with -
// exclude files with that prefix.
// Note that this table applies only to the build of cmd/go,
// after the main compiler bootstrap.
var deptab = []struct {
prefix string // prefix of target
dep []string // dependency tweaks for targets with that prefix
}{
{"cmd/go/internal/cfg", []string{
"zdefaultcc.go",
"zosarch.go",
}},
{"runtime/internal/sys", []string{
"zversion.go",
}},
{"go/build", []string{
"zcgo.go",
}},
}
// depsuffix records the allowed suffixes for source files.
var depsuffix = []string{
".s",
".go",
}
// gentab records how to generate some trivial files.
var gentab = []struct {
nameprefix string
gen func(string, string)
}{
{"zdefaultcc.go", mkzdefaultcc},
{"zosarch.go", mkzosarch},
{"zversion.go", mkzversion},
{"zcgo.go", mkzcgo},
// not generated anymore, but delete the file if we see it
{"enam.c", nil},
{"anames5.c", nil},
{"anames6.c", nil},
{"anames8.c", nil},
{"anames9.c", nil},
}
// installed maps from a dir name (as given to install) to a chan
// closed when the dir's package is installed.
var installed = make(map[string]chan struct{})
var installedMu sync.Mutex
func install(dir string) {
<-startInstall(dir)
}
func startInstall(dir string) chan struct{} {
installedMu.Lock()
ch := installed[dir]
if ch == nil {
ch = make(chan struct{})
installed[dir] = ch
go runInstall(dir, ch)
}
installedMu.Unlock()
return ch
}
// runInstall installs the library, package, or binary associated with dir,
// which is relative to $GOROOT/src.
func runInstall(dir string, ch chan struct{}) {
if dir == "net" || dir == "os/user" || dir == "crypto/x509" {
fatalf("go_bootstrap cannot depend on cgo package %s", dir)
}
defer close(ch)
if dir == "unsafe" {
return
}
if vflag > 0 {
if goos != gohostos || goarch != gohostarch {
errprintf("%s (%s/%s)\n", dir, goos, goarch)
} else {
errprintf("%s\n", dir)
}
}
workdir := pathf("%s/%s", workdir, dir)
xmkdirall(workdir)
var clean []string
defer func() {
for _, name := range clean {
xremove(name)
}
}()
// path = full path to dir.
path := pathf("%s/src/%s", goroot, dir)
name := filepath.Base(dir)
ispkg := !strings.HasPrefix(dir, "cmd/") || strings.Contains(dir, "/internal/")
// Start final link command line.
// Note: code below knows that link.p[targ] is the target.
var (
link []string
targ int
ispackcmd bool
)
if ispkg {
// Go library (package).
ispackcmd = true
link = []string{"pack", pathf("%s/pkg/%s_%s/%s.a", goroot, goos, goarch, dir)}
targ = len(link) - 1
xmkdirall(filepath.Dir(link[targ]))
} else {
// Go command.
elem := name
if elem == "go" {
elem = "go_bootstrap"
}
link = []string{pathf("%s/link", tooldir)}
if goos == "android" {
link = append(link, "-buildmode=pie")
}
if goldflags != "" {
link = append(link, goldflags)
}
link = append(link, "-extld="+compilerEnvLookup(defaultcc, goos, goarch))
link = append(link, "-o", pathf("%s/%s%s", tooldir, elem, exe))
targ = len(link) - 1
}
ttarg := mtime(link[targ])
// Gather files that are sources for this target.
// Everything in that directory, and any target-specific
// additions.
files := xreaddir(path)
// Remove files beginning with . or _,
// which are likely to be editor temporary files.
// This is the same heuristic build.ScanDir uses.
// There do exist real C files beginning with _,
// so limit that check to just Go files.
files = filter(files, func(p string) bool {
return !strings.HasPrefix(p, ".") && (!strings.HasPrefix(p, "_") || !strings.HasSuffix(p, ".go"))
})
for _, dt := range deptab {
if dir == dt.prefix || strings.HasSuffix(dt.prefix, "/") && strings.HasPrefix(dir, dt.prefix) {
for _, p := range dt.dep {
p = os.ExpandEnv(p)
files = append(files, p)
}
}
}
files = uniq(files)
// Convert to absolute paths.
for i, p := range files {
if !filepath.IsAbs(p) {
files[i] = pathf("%s/%s", path, p)
}
}
// Is the target up-to-date?
var gofiles, sfiles, missing []string
stale := rebuildall
files = filter(files, func(p string) bool {
for _, suf := range depsuffix {
if strings.HasSuffix(p, suf) {
goto ok
}
}
return false
ok:
t := mtime(p)
if !t.IsZero() && !strings.HasSuffix(p, ".a") && !shouldbuild(p, dir) {
return false
}
if strings.HasSuffix(p, ".go") {
gofiles = append(gofiles, p)
} else if strings.HasSuffix(p, ".s") {
sfiles = append(sfiles, p)
}
if t.After(ttarg) {
stale = true
}
if t.IsZero() {
missing = append(missing, p)
}
return true
})
// If there are no files to compile, we're done.
if len(files) == 0 {
return
}
if !stale {
return
}
// For package runtime, copy some files into the work space.
if dir == "runtime" {
xmkdirall(pathf("%s/pkg/include", goroot))
// For use by assembly and C files.
copyfile(pathf("%s/pkg/include/textflag.h", goroot),
pathf("%s/src/runtime/textflag.h", goroot), 0)
copyfile(pathf("%s/pkg/include/funcdata.h", goroot),
pathf("%s/src/runtime/funcdata.h", goroot), 0)
copyfile(pathf("%s/pkg/include/asm_ppc64x.h", goroot),
pathf("%s/src/runtime/asm_ppc64x.h", goroot), 0)
}
// Generate any missing files; regenerate existing ones.
for _, p := range files {
elem := filepath.Base(p)
for _, gt := range gentab {
if gt.gen == nil {
continue
}
if strings.HasPrefix(elem, gt.nameprefix) {
if vflag > 1 {
errprintf("generate %s\n", p)
}
gt.gen(path, p)
// Do not add generated file to clean list.
// In runtime, we want to be able to
// build the package with the go tool,
// and it assumes these generated files already
// exist (it does not know how to build them).
// The 'clean' command can remove
// the generated files.
goto built
}
}
// Did not rebuild p.
if find(p, missing) >= 0 {
fatalf("missing file %s", p)
}
built:
}
// Make sure dependencies are installed.
var deps []string
for _, p := range gofiles {
deps = append(deps, readimports(p)...)
}
for _, dir1 := range deps {
startInstall(dir1)
}
for _, dir1 := range deps {
install(dir1)
}
if goos != gohostos || goarch != gohostarch {
// We've generated the right files; the go command can do the build.
if vflag > 1 {
errprintf("skip build for cross-compile %s\n", dir)
}
return
}
asmArgs := []string{
pathf("%s/asm", tooldir),
"-I", workdir,
"-I", pathf("%s/pkg/include", goroot),
"-D", "GOOS_" + goos,
"-D", "GOARCH_" + goarch,
"-D", "GOOS_GOARCH_" + goos + "_" + goarch,
}
if goarch == "mips" || goarch == "mipsle" {
// Define GOMIPS_value from gomips.
asmArgs = append(asmArgs, "-D", "GOMIPS_"+gomips)
}
if goarch == "mips64" || goarch == "mipsle64" {
// Define GOMIPS64_value from gomips64.
asmArgs = append(asmArgs, "-D", "GOMIPS64_"+gomips64)
}
goasmh := pathf("%s/go_asm.h", workdir)
// Collect symabis from assembly code.
var symabis string
if len(sfiles) > 0 {
symabis = pathf("%s/symabis", workdir)
var wg sync.WaitGroup
asmabis := append(asmArgs[:len(asmArgs):len(asmArgs)], "-gensymabis", "-o", symabis)
asmabis = append(asmabis, sfiles...)
if err := ioutil.WriteFile(goasmh, nil, 0666); err != nil {
fatalf("cannot write empty go_asm.h: %s", err)
}
bgrun(&wg, path, asmabis...)
bgwait(&wg)
}
var archive string
// The next loop will compile individual non-Go files.
// Hand the Go files to the compiler en masse.
// For packages containing assembly, this writes go_asm.h, which
// the assembly files will need.
pkg := dir
if strings.HasPrefix(dir, "cmd/") && strings.Count(dir, "/") == 1 {
pkg = "main"
}
b := pathf("%s/_go_.a", workdir)
clean = append(clean, b)
if !ispackcmd {
link = append(link, b)
} else {
archive = b
}
// Compile Go code.
compile := []string{pathf("%s/compile", tooldir), "-std", "-pack", "-o", b, "-p", pkg}
if gogcflags != "" {
compile = append(compile, strings.Fields(gogcflags)...)
}
if dir == "runtime" {
compile = append(compile, "-+")
}
if len(sfiles) > 0 {
compile = append(compile, "-asmhdr", goasmh)
}
if symabis != "" {
compile = append(compile, "-symabis", symabis)
}
if goos == "android" {
compile = append(compile, "-shared")
}
compile = append(compile, gofiles...)
var wg sync.WaitGroup
// We use bgrun and immediately wait for it instead of calling run() synchronously.
// This executes all jobs through the bgwork channel and allows the process
// to exit cleanly in case an error occurs.
bgrun(&wg, path, compile...)
bgwait(&wg)
// Compile the files.
for _, p := range sfiles {
// Assembly file for a Go package.
compile := asmArgs[:len(asmArgs):len(asmArgs)]
doclean := true
b := pathf("%s/%s", workdir, filepath.Base(p))
// Change the last character of the output file (which was c or s).
b = b[:len(b)-1] + "o"
compile = append(compile, "-o", b, p)
bgrun(&wg, path, compile...)
link = append(link, b)
if doclean {
clean = append(clean, b)
}
}
bgwait(&wg)
if ispackcmd {
xremove(link[targ])
dopack(link[targ], archive, link[targ+1:])
return
}
// Remove target before writing it.
xremove(link[targ])
bgrun(&wg, "", link...)
bgwait(&wg)
}
// matchfield reports whether the field (x,y,z) matches this build.
// all the elements in the field must be satisfied.
func matchfield(f string) bool {
for _, tag := range strings.Split(f, ",") {
if !matchtag(tag) {
return false
}
}
return true
}
// matchtag reports whether the tag (x or !x) matches this build.
func matchtag(tag string) bool {
if tag == "" {
return false
}
if tag[0] == '!' {
if len(tag) == 1 || tag[1] == '!' {
return false
}
return !matchtag(tag[1:])
}
return tag == "gc" || tag == goos || tag == goarch || tag == "cmd_go_bootstrap" || tag == "go1.1" || (goos == "android" && tag == "linux") || (goos == "illumos" && tag == "solaris")
}
// shouldbuild reports whether we should build this file.
// It applies the same rules that are used with context tags
// in package go/build, except it's less picky about the order
// of GOOS and GOARCH.
// We also allow the special tag cmd_go_bootstrap.
// See ../go/bootstrap.go and package go/build.
func shouldbuild(file, dir string) bool {
// Check file name for GOOS or GOARCH.
name := filepath.Base(file)
excluded := func(list []string, ok string) bool {
for _, x := range list {
if x == ok || (ok == "android" && x == "linux") || (ok == "illumos" && x == "solaris") {
continue
}
i := strings.Index(name, x)
if i <= 0 || name[i-1] != '_' {
continue
}
i += len(x)
if i == len(name) || name[i] == '.' || name[i] == '_' {
return true
}
}
return false
}
if excluded(okgoos, goos) || excluded(okgoarch, goarch) {
return false
}
// Omit test files.
if strings.Contains(name, "_test") {
return false
}
// Check file contents for // +build lines.
for _, p := range strings.Split(readfile(file), "\n") {
p = strings.TrimSpace(p)
if p == "" {
continue
}
code := p
i := strings.Index(code, "//")
if i > 0 {
code = strings.TrimSpace(code[:i])
}
if code == "package documentation" {
return false
}
if code == "package main" && dir != "cmd/go" && dir != "cmd/cgo" {
return false
}
if !strings.HasPrefix(p, "//") {
break
}
if !strings.Contains(p, "+build") {
continue
}
fields := strings.Fields(p[2:])
if len(fields) < 1 || fields[0] != "+build" {
continue
}
for _, p := range fields[1:] {
if matchfield(p) {
goto fieldmatch
}
}
return false
fieldmatch:
}
return true
}
// copy copies the file src to dst, via memory (so only good for small files).
func copyfile(dst, src string, flag int) {
if vflag > 1 {
errprintf("cp %s %s\n", src, dst)
}
writefile(readfile(src), dst, flag)
}
// dopack copies the package src to dst,
// appending the files listed in extra.
// The archive format is the traditional Unix ar format.
func dopack(dst, src string, extra []string) {
bdst := bytes.NewBufferString(readfile(src))
for _, file := range extra {
b := readfile(file)
// find last path element for archive member name
i := strings.LastIndex(file, "/") + 1
j := strings.LastIndex(file, `\`) + 1
if i < j {
i = j
}
fmt.Fprintf(bdst, "%-16.16s%-12d%-6d%-6d%-8o%-10d`\n", file[i:], 0, 0, 0, 0644, len(b))
bdst.WriteString(b)
if len(b)&1 != 0 {
bdst.WriteByte(0)
}
}
writefile(bdst.String(), dst, 0)
}
var runtimegen = []string{
"zaexperiment.h",
"zversion.go",
}
// cleanlist is a list of packages with generated files and commands.
var cleanlist = []string{
"runtime/internal/sys",
"cmd/cgo",
"cmd/go/internal/cfg",
"go/build",
}
func clean() {
for _, name := range cleanlist {
path := pathf("%s/src/%s", goroot, name)
// Remove generated files.
for _, elem := range xreaddir(path) {
for _, gt := range gentab {
if strings.HasPrefix(elem, gt.nameprefix) {
xremove(pathf("%s/%s", path, elem))
}
}
}
// Remove generated binary named for directory.
if strings.HasPrefix(name, "cmd/") {
xremove(pathf("%s/%s", path, name[4:]))
}
}
// remove runtimegen files.
path := pathf("%s/src/runtime", goroot)
for _, elem := range runtimegen {
xremove(pathf("%s/%s", path, elem))
}
if rebuildall {
// Remove object tree.
xremoveall(pathf("%s/pkg/obj/%s_%s", goroot, gohostos, gohostarch))
// Remove installed packages and tools.
xremoveall(pathf("%s/pkg/%s_%s", goroot, gohostos, gohostarch))
xremoveall(pathf("%s/pkg/%s_%s", goroot, goos, goarch))
xremoveall(pathf("%s/pkg/%s_%s_race", goroot, gohostos, gohostarch))
xremoveall(pathf("%s/pkg/%s_%s_race", goroot, goos, goarch))
xremoveall(tooldir)
// Remove cached version info.
xremove(pathf("%s/VERSION.cache", goroot))
}
}
/*
* command implementations
*/
// The env command prints the default environment.
func cmdenv() {
path := flag.Bool("p", false, "emit updated PATH")
plan9 := flag.Bool("9", false, "emit plan 9 syntax")
windows := flag.Bool("w", false, "emit windows syntax")
xflagparse(0)
format := "%s=\"%s\"\n"
switch {
case *plan9:
format = "%s='%s'\n"
case *windows:
format = "set %s=%s\r\n"
}
xprintf(format, "GOARCH", goarch)
xprintf(format, "GOBIN", gobin)
xprintf(format, "GOCACHE", os.Getenv("GOCACHE"))
xprintf(format, "GODEBUG", os.Getenv("GODEBUG"))
xprintf(format, "GOHOSTARCH", gohostarch)
xprintf(format, "GOHOSTOS", gohostos)
xprintf(format, "GOOS", goos)
xprintf(format, "GOPROXY", os.Getenv("GOPROXY"))
xprintf(format, "GOROOT", goroot)
xprintf(format, "GOTMPDIR", os.Getenv("GOTMPDIR"))
xprintf(format, "GOTOOLDIR", tooldir)
if goarch == "arm" {
xprintf(format, "GOARM", goarm)
}
if goarch == "386" {
xprintf(format, "GO386", go386)
}
if goarch == "mips" || goarch == "mipsle" {
xprintf(format, "GOMIPS", gomips)
}
if goarch == "mips64" || goarch == "mips64le" {
xprintf(format, "GOMIPS64", gomips64)
}
if goarch == "ppc64" || goarch == "ppc64le" {
xprintf(format, "GOPPC64", goppc64)
}
if *path {
sep := ":"
if gohostos == "windows" {
sep = ";"
}
xprintf(format, "PATH", fmt.Sprintf("%s%s%s", gobin, sep, os.Getenv("PATH")))
}
}
var (
timeLogEnabled = os.Getenv("GOBUILDTIMELOGFILE") != ""
timeLogMu sync.Mutex
timeLogFile *os.File
timeLogStart time.Time
)
func timelog(op, name string) {
if !timeLogEnabled {
return
}
timeLogMu.Lock()
defer timeLogMu.Unlock()
if timeLogFile == nil {
f, err := os.OpenFile(os.Getenv("GOBUILDTIMELOGFILE"), os.O_RDWR|os.O_APPEND, 0666)
if err != nil {
log.Fatal(err)
}
buf := make([]byte, 100)
n, _ := f.Read(buf)
s := string(buf[:n])
if i := strings.Index(s, "\n"); i >= 0 {
s = s[:i]
}
i := strings.Index(s, " start")
if i < 0 {
log.Fatalf("time log %s does not begin with start line", os.Getenv("GOBULDTIMELOGFILE"))
}
t, err := time.Parse(time.UnixDate, s[:i])
if err != nil {
log.Fatalf("cannot parse time log line %q: %v", s, err)
}
timeLogStart = t
timeLogFile = f
}
t := time.Now()
fmt.Fprintf(timeLogFile, "%s %+.1fs %s %s\n", t.Format(time.UnixDate), t.Sub(timeLogStart).Seconds(), op, name)
}
var toolchain = []string{"cmd/asm", "cmd/cgo", "cmd/compile", "cmd/link"}
// The bootstrap command runs a build from scratch,
// stopping at having installed the go_bootstrap command.
//
// WARNING: This command runs after cmd/dist is built with Go 1.4.
// It rebuilds and installs cmd/dist with the new toolchain, so other
// commands (like "go tool dist test" in run.bash) can rely on bug fixes
// made since Go 1.4, but this function cannot. In particular, the uses
// of os/exec in this function cannot assume that
// cmd.Env = append(os.Environ(), "X=Y")
// sets $X to Y in the command's environment. That guarantee was
// added after Go 1.4, and in fact in Go 1.4 it was typically the opposite:
// if $X was already present in os.Environ(), most systems preferred
// that setting, not the new one.
func cmdbootstrap() {
timelog("start", "dist bootstrap")
defer timelog("end", "dist bootstrap")
var noBanner bool
var debug bool
flag.BoolVar(&rebuildall, "a", rebuildall, "rebuild all")
flag.BoolVar(&debug, "d", debug, "enable debugging of bootstrap process")
flag.BoolVar(&noBanner, "no-banner", noBanner, "do not print banner")
xflagparse(0)
// Set GOPATH to an internal directory. We shouldn't actually
// need to store files here, since the toolchain won't
// depend on modules outside of vendor directories, but if
// GOPATH points somewhere else (e.g., to GOROOT), the
// go tool may complain.
os.Setenv("GOPATH", pathf("%s/pkg/obj/gopath", goroot))
if debug {
// cmd/buildid is used in debug mode.
toolchain = append(toolchain, "cmd/buildid")
}
if isdir(pathf("%s/src/pkg", goroot)) {
fatalf("\n\n"+
"The Go package sources have moved to $GOROOT/src.\n"+
"*** %s still exists. ***\n"+
"It probably contains stale files that may confuse the build.\n"+
"Please (check what's there and) remove it and try again.\n"+
"See https://golang.org/s/go14nopkg\n",
pathf("%s/src/pkg", goroot))
}
if rebuildall {
clean()
}
setup()
timelog("build", "toolchain1")
checkCC()
bootstrapBuildTools()
// Remember old content of $GOROOT/bin for comparison below.
oldBinFiles, _ := filepath.Glob(pathf("%s/bin/*", goroot))
// For the main bootstrap, building for host os/arch.
oldgoos = goos
oldgoarch = goarch
goos = gohostos
goarch = gohostarch
os.Setenv("GOHOSTARCH", gohostarch)
os.Setenv("GOHOSTOS", gohostos)
os.Setenv("GOARCH", goarch)
os.Setenv("GOOS", goos)
timelog("build", "go_bootstrap")
xprintf("Building Go bootstrap cmd/go (go_bootstrap) using Go toolchain1.\n")
install("runtime") // dependency not visible in sources; also sets up textflag.h
install("cmd/go")
if vflag > 0 {
xprintf("\n")
}
gogcflags = os.Getenv("GO_GCFLAGS") // we were using $BOOT_GO_GCFLAGS until now
goldflags = os.Getenv("GO_LDFLAGS") // we were using $BOOT_GO_LDFLAGS until now
goBootstrap := pathf("%s/go_bootstrap", tooldir)
cmdGo := pathf("%s/go", gobin)
if debug {
run("", ShowOutput|CheckExit, pathf("%s/compile", tooldir), "-V=full")
copyfile(pathf("%s/compile1", tooldir), pathf("%s/compile", tooldir), writeExec)
}
// To recap, so far we have built the new toolchain
// (cmd/asm, cmd/cgo, cmd/compile, cmd/link)
// using Go 1.4's toolchain and go command.
// Then we built the new go command (as go_bootstrap)
// using the new toolchain and our own build logic (above).
//
// toolchain1 = mk(new toolchain, go1.4 toolchain, go1.4 cmd/go)
// go_bootstrap = mk(new cmd/go, toolchain1, cmd/dist)
//
// The toolchain1 we built earlier is built from the new sources,
// but because it was built using cmd/go it has no build IDs.
// The eventually installed toolchain needs build IDs, so we need
// to do another round:
//
// toolchain2 = mk(new toolchain, toolchain1, go_bootstrap)
//
timelog("build", "toolchain2")
if vflag > 0 {
xprintf("\n")
}
xprintf("Building Go toolchain2 using go_bootstrap and Go toolchain1.\n")
os.Setenv("CC", compilerEnvLookup(defaultcc, goos, goarch))
goInstall(goBootstrap, append([]string{"-i"}, toolchain...)...)
if debug {
run("", ShowOutput|CheckExit, pathf("%s/compile", tooldir), "-V=full")
run("", ShowOutput|CheckExit, pathf("%s/buildid", tooldir), pathf("%s/pkg/%s_%s/runtime/internal/sys.a", goroot, goos, goarch))
copyfile(pathf("%s/compile2", tooldir), pathf("%s/compile", tooldir), writeExec)
}
// Toolchain2 should be semantically equivalent to toolchain1,
// but it was built using the new compilers instead of the Go 1.4 compilers,
// so it should at the least run faster. Also, toolchain1 had no build IDs
// in the binaries, while toolchain2 does. In non-release builds, the
// toolchain's build IDs feed into constructing the build IDs of built targets,
// so in non-release builds, everything now looks out-of-date due to
// toolchain2 having build IDs - that is, due to the go command seeing
// that there are new compilers. In release builds, the toolchain's reported
// version is used in place of the build ID, and the go command does not
// see that change from toolchain1 to toolchain2, so in release builds,
// nothing looks out of date.
// To keep the behavior the same in both non-release and release builds,
// we force-install everything here.
//
// toolchain3 = mk(new toolchain, toolchain2, go_bootstrap)
//
timelog("build", "toolchain3")
if vflag > 0 {
xprintf("\n")
}
xprintf("Building Go toolchain3 using go_bootstrap and Go toolchain2.\n")
goInstall(goBootstrap, append([]string{"-a", "-i"}, toolchain...)...)
if debug {
run("", ShowOutput|CheckExit, pathf("%s/compile", tooldir), "-V=full")
run("", ShowOutput|CheckExit, pathf("%s/buildid", tooldir), pathf("%s/pkg/%s_%s/runtime/internal/sys.a", goroot, goos, goarch))
copyfile(pathf("%s/compile3", tooldir), pathf("%s/compile", tooldir), writeExec)
}
checkNotStale(goBootstrap, append(toolchain, "runtime/internal/sys")...)
if goos == oldgoos && goarch == oldgoarch {
// Common case - not setting up for cross-compilation.
timelog("build", "toolchain")
if vflag > 0 {
xprintf("\n")
}
xprintf("Building packages and commands for %s/%s.\n", goos, goarch)
} else {
// GOOS/GOARCH does not match GOHOSTOS/GOHOSTARCH.
// Finish GOHOSTOS/GOHOSTARCH installation and then
// run GOOS/GOARCH installation.
timelog("build", "host toolchain")
if vflag > 0 {
xprintf("\n")
}
xprintf("Building packages and commands for host, %s/%s.\n", goos, goarch)
goInstall(goBootstrap, "std", "cmd")
checkNotStale(goBootstrap, "std", "cmd")
checkNotStale(cmdGo, "std", "cmd")
timelog("build", "target toolchain")
if vflag > 0 {
xprintf("\n")
}
goos = oldgoos
goarch = oldgoarch
os.Setenv("GOOS", goos)
os.Setenv("GOARCH", goarch)
os.Setenv("CC", compilerEnvLookup(defaultcc, goos, goarch))
xprintf("Building packages and commands for target, %s/%s.\n", goos, goarch)
}
targets := []string{"std", "cmd"}
if goos == "js" && goarch == "wasm" {
// Skip the cmd tools for js/wasm. They're not usable.
targets = targets[:1]
}
goInstall(goBootstrap, targets...)
checkNotStale(goBootstrap, targets...)
checkNotStale(cmdGo, targets...)
if debug {
run("", ShowOutput|CheckExit, pathf("%s/compile", tooldir), "-V=full")
run("", ShowOutput|CheckExit, pathf("%s/buildid", tooldir), pathf("%s/pkg/%s_%s/runtime/internal/sys.a", goroot, goos, goarch))
checkNotStale(goBootstrap, append(toolchain, "runtime/internal/sys")...)
copyfile(pathf("%s/compile4", tooldir), pathf("%s/compile", tooldir), writeExec)
}
// Check that there are no new files in $GOROOT/bin other than
// go and gofmt and $GOOS_$GOARCH (target bin when cross-compiling).
binFiles, _ := filepath.Glob(pathf("%s/bin/*", goroot))
ok := map[string]bool{}
for _, f := range oldBinFiles {
ok[f] = true
}
for _, f := range binFiles {
elem := strings.TrimSuffix(filepath.Base(f), ".exe")
if !ok[f] && elem != "go" && elem != "gofmt" && elem != goos+"_"+goarch {
fatalf("unexpected new file in $GOROOT/bin: %s", elem)
}
}
// Remove go_bootstrap now that we're done.
xremove(pathf("%s/go_bootstrap", tooldir))
if goos == "android" {
// Make sure the exec wrapper will sync a fresh $GOROOT to the device.
xremove(pathf("%s/go_android_exec-adb-sync-status", os.TempDir()))
}
if wrapperPath := wrapperPathFor(goos, goarch); wrapperPath != "" {
oldcc := os.Getenv("CC")
os.Setenv("GOOS", gohostos)
os.Setenv("GOARCH", gohostarch)
os.Setenv("CC", compilerEnvLookup(defaultcc, gohostos, gohostarch))
goCmd(cmdGo, "build", "-o", pathf("%s/go_%s_%s_exec%s", gobin, goos, goarch, exe), wrapperPath)
// Restore environment.
// TODO(elias.naur): support environment variables in goCmd?
os.Setenv("GOOS", goos)
os.Setenv("GOARCH", goarch)
os.Setenv("CC", oldcc)
}
// Print trailing banner unless instructed otherwise.
if !noBanner {
banner()
}
}
func wrapperPathFor(goos, goarch string) string {
switch {
case goos == "android":
if gohostos != "android" {
return pathf("%s/misc/android/go_android_exec.go", goroot)
}
case goos == "darwin" && (goarch == "arm" || goarch == "arm64"):
if gohostos != "darwin" || (gohostarch != "arm" && gohostarch != "arm64") {
return pathf("%s/misc/ios/go_darwin_arm_exec.go", goroot)
}
}
return ""
}
func goInstall(goBinary string, args ...string) {
goCmd(goBinary, "install", args...)
}
func goCmd(goBinary string, cmd string, args ...string) {
goCmd := []string{goBinary, cmd, "-gcflags=all=" + gogcflags, "-ldflags=all=" + goldflags}
if vflag > 0 {
goCmd = append(goCmd, "-v")
}
// Force only one process at a time on vx32 emulation.
if gohostos == "plan9" && os.Getenv("sysname") == "vx32" {
goCmd = append(goCmd, "-p=1")
}
run(goroot, ShowOutput|CheckExit, append(goCmd, args...)...)
}
func checkNotStale(goBinary string, targets ...string) {
out := run(goroot, CheckExit,
append([]string{
goBinary,
"list", "-gcflags=all=" + gogcflags, "-ldflags=all=" + goldflags,
"-f={{if .Stale}}\tSTALE {{.ImportPath}}: {{.StaleReason}}{{end}}",
}, targets...)...)
if strings.Contains(out, "\tSTALE ") {
os.Setenv("GODEBUG", "gocachehash=1")
for _, target := range []string{"runtime/internal/sys", "cmd/dist", "cmd/link"} {
if strings.Contains(out, "STALE "+target) {
run(goroot, ShowOutput|CheckExit, goBinary, "list", "-f={{.ImportPath}} {{.Stale}}", target)
break
}
}
fatalf("unexpected stale targets reported by %s list -gcflags=\"%s\" -ldflags=\"%s\" for %v:\n%s", goBinary, gogcflags, goldflags, targets, out)
}
}
// Cannot use go/build directly because cmd/dist for a new release
// builds against an old release's go/build, which may be out of sync.
// To reduce duplication, we generate the list for go/build from this.
//
// We list all supported platforms in this list, so that this is the
// single point of truth for supported platforms. This list is used
// by 'go tool dist list'.
var cgoEnabled = map[string]bool{
"aix/ppc64": true,
"darwin/386": false, // Issue 31751
"darwin/amd64": true,
"darwin/arm": true,
"darwin/arm64": true,
"dragonfly/amd64": true,
"freebsd/386": true,
"freebsd/amd64": true,
"freebsd/arm": true,
"illumos/amd64": true,
"linux/386": true,
"linux/amd64": true,
"linux/arm": true,
"linux/arm64": true,
"linux/ppc64": false,
"linux/ppc64le": true,
"linux/mips": true,
"linux/mipsle": true,
"linux/mips64": true,
"linux/mips64le": true,
"linux/riscv64": true,
"linux/s390x": true,
"linux/sparc64": true,
"android/386": true,
"android/amd64": true,
"android/arm": true,
"android/arm64": true,
"js/wasm": false,
"nacl/386": false,
"nacl/amd64p32": false,
"nacl/arm": false,
"netbsd/386": true,
"netbsd/amd64": true,
"netbsd/arm": true,
"netbsd/arm64": true,
"openbsd/386": true,
"openbsd/amd64": true,
"openbsd/arm": true,
"openbsd/arm64": true,
"plan9/386": false,
"plan9/amd64": false,
"plan9/arm": false,
"solaris/amd64": true,
"windows/386": true,
"windows/amd64": true,
"windows/arm": false,
}
// List of platforms which are supported but not complete yet. These get
// filtered out of cgoEnabled for 'dist list'. See golang.org/issue/28944
var incomplete = map[string]bool{
"linux/riscv64": true,
"linux/sparc64": true,
}
func needCC() bool {
switch os.Getenv("CGO_ENABLED") {
case "1":
return true
case "0":
return false
}
return cgoEnabled[gohostos+"/"+gohostarch]
}
func checkCC() {
if !needCC() {
return
}
if output, err := exec.Command(defaultcc[""], "--help").CombinedOutput(); err != nil {
outputHdr := ""
if len(output) > 0 {
outputHdr = "\nCommand output:\n\n"
}
fatalf("cannot invoke C compiler %q: %v\n\n"+
"Go needs a system C compiler for use with cgo.\n"+
"To set a C compiler, set CC=the-compiler.\n"+
"To disable cgo, set CGO_ENABLED=0.\n%s%s", defaultcc[""], err, outputHdr, output)
}
}
func defaulttarg() string {
// xgetwd might return a path with symlinks fully resolved, and if
// there happens to be symlinks in goroot, then the hasprefix test
// will never succeed. Instead, we use xrealwd to get a canonical
// goroot/src before the comparison to avoid this problem.
pwd := xgetwd()
src := pathf("%s/src/", goroot)
real_src := xrealwd(src)
if !strings.HasPrefix(pwd, real_src) {
fatalf("current directory %s is not under %s", pwd, real_src)
}
pwd = pwd[len(real_src):]
// guard against xrealwd returning the directory without the trailing /
pwd = strings.TrimPrefix(pwd, "/")
return pwd
}
// Install installs the list of packages named on the command line.
func cmdinstall() {
xflagparse(-1)
if flag.NArg() == 0 {
install(defaulttarg())
}
for _, arg := range flag.Args() {
install(arg)
}
}
// Clean deletes temporary objects.
func cmdclean() {
xflagparse(0)
clean()
}
// Banner prints the 'now you've installed Go' banner.
func cmdbanner() {
xflagparse(0)
banner()
}
func banner() {
if vflag > 0 {
xprintf("\n")
}
xprintf("---\n")
xprintf("Installed Go for %s/%s in %s\n", goos, goarch, goroot)
xprintf("Installed commands in %s\n", gobin)
if !xsamefile(goroot_final, goroot) {
// If the files are to be moved, don't check that gobin
// is on PATH; assume they know what they are doing.
} else if gohostos == "plan9" {
// Check that gobin is bound before /bin.
pid := strings.Replace(readfile("#c/pid"), " ", "", -1)
ns := fmt.Sprintf("/proc/%s/ns", pid)
if !strings.Contains(readfile(ns), fmt.Sprintf("bind -b %s /bin", gobin)) {
xprintf("*** You need to bind %s before /bin.\n", gobin)
}
} else {
// Check that gobin appears in $PATH.
pathsep := ":"
if gohostos == "windows" {
pathsep = ";"
}
if !strings.Contains(pathsep+os.Getenv("PATH")+pathsep, pathsep+gobin+pathsep) {
xprintf("*** You need to add %s to your PATH.\n", gobin)
}
}
if !xsamefile(goroot_final, goroot) {
xprintf("\n"+
"The binaries expect %s to be copied or moved to %s\n",
goroot, goroot_final)
}
}
// Version prints the Go version.
func cmdversion() {
xflagparse(0)
xprintf("%s\n", findgoversion())
}
// cmdlist lists all supported platforms.
func cmdlist() {
jsonFlag := flag.Bool("json", false, "produce JSON output")
xflagparse(0)
var plats []string
for p := range cgoEnabled {
if incomplete[p] {
continue
}
plats = append(plats, p)
}
sort.Strings(plats)
if !*jsonFlag {
for _, p := range plats {
xprintf("%s\n", p)
}
return
}
type jsonResult struct {
GOOS string
GOARCH string
CgoSupported bool
}
var results []jsonResult
for _, p := range plats {
fields := strings.Split(p, "/")
results = append(results, jsonResult{
GOOS: fields[0],
GOARCH: fields[1],
CgoSupported: cgoEnabled[p]})
}
out, err := json.MarshalIndent(results, "", "\t")
if err != nil {
fatalf("json marshal error: %v", err)
}
if _, err := os.Stdout.Write(out); err != nil {
fatalf("write failed: %v", err)
}
}
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