Your IP : 172.28.240.42
// Copyright 2011 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.
//go:generate go test cmd/go -v -run=TestDocsUpToDate -fixdocs
package main
import (
"cmd/go/internal/toolchain"
"cmd/go/internal/workcmd"
"context"
"flag"
"fmt"
"internal/buildcfg"
"log"
"os"
"path/filepath"
"runtime"
rtrace "runtime/trace"
"slices"
"strings"
"cmd/go/internal/base"
"cmd/go/internal/bug"
"cmd/go/internal/cfg"
"cmd/go/internal/clean"
"cmd/go/internal/doc"
"cmd/go/internal/envcmd"
"cmd/go/internal/fix"
"cmd/go/internal/fmtcmd"
"cmd/go/internal/generate"
"cmd/go/internal/get"
"cmd/go/internal/help"
"cmd/go/internal/list"
"cmd/go/internal/modcmd"
"cmd/go/internal/modfetch"
"cmd/go/internal/modget"
"cmd/go/internal/modload"
"cmd/go/internal/run"
"cmd/go/internal/test"
"cmd/go/internal/tool"
"cmd/go/internal/trace"
"cmd/go/internal/version"
"cmd/go/internal/vet"
"cmd/go/internal/work"
)
func init() {
base.Go.Commands = []*base.Command{
bug.CmdBug,
work.CmdBuild,
clean.CmdClean,
doc.CmdDoc,
envcmd.CmdEnv,
fix.CmdFix,
fmtcmd.CmdFmt,
generate.CmdGenerate,
modget.CmdGet,
work.CmdInstall,
list.CmdList,
modcmd.CmdMod,
workcmd.CmdWork,
run.CmdRun,
test.CmdTest,
tool.CmdTool,
version.CmdVersion,
vet.CmdVet,
help.HelpBuildConstraint,
help.HelpBuildmode,
help.HelpC,
help.HelpCache,
help.HelpEnvironment,
help.HelpFileType,
modload.HelpGoMod,
help.HelpGopath,
get.HelpGopathGet,
modfetch.HelpGoproxy,
help.HelpImportPath,
modload.HelpModules,
modget.HelpModuleGet,
modfetch.HelpModuleAuth,
help.HelpPackages,
modfetch.HelpPrivate,
test.HelpTestflag,
test.HelpTestfunc,
modget.HelpVCS,
}
}
var _ = go11tag
func main() {
log.SetFlags(0)
handleChdirFlag()
toolchain.Select()
flag.Usage = base.Usage
flag.Parse()
args := flag.Args()
if len(args) < 1 {
base.Usage()
}
if args[0] == "get" || args[0] == "help" {
if !modload.WillBeEnabled() {
// Replace module-aware get with GOPATH get if appropriate.
*modget.CmdGet = *get.CmdGet
}
}
cfg.CmdName = args[0] // for error messages
if args[0] == "help" {
help.Help(os.Stdout, args[1:])
return
}
// Diagnose common mistake: GOPATH==GOROOT.
// This setting is equivalent to not setting GOPATH at all,
// which is not what most people want when they do it.
if gopath := cfg.BuildContext.GOPATH; filepath.Clean(gopath) == filepath.Clean(runtime.GOROOT()) {
fmt.Fprintf(os.Stderr, "warning: GOPATH set to GOROOT (%s) has no effect\n", gopath)
} else {
for _, p := range filepath.SplitList(gopath) {
// Some GOPATHs have empty directory elements - ignore them.
// See issue 21928 for details.
if p == "" {
continue
}
// Note: using HasPrefix instead of Contains because a ~ can appear
// in the middle of directory elements, such as /tmp/git-1.8.2~rc3
// or C:\PROGRA~1. Only ~ as a path prefix has meaning to the shell.
if strings.HasPrefix(p, "~") {
fmt.Fprintf(os.Stderr, "go: GOPATH entry cannot start with shell metacharacter '~': %q\n", p)
os.Exit(2)
}
if !filepath.IsAbs(p) {
if cfg.Getenv("GOPATH") == "" {
// We inferred $GOPATH from $HOME and did a bad job at it.
// Instead of dying, uninfer it.
cfg.BuildContext.GOPATH = ""
} else {
fmt.Fprintf(os.Stderr, "go: GOPATH entry is relative; must be absolute path: %q.\nFor more details see: 'go help gopath'\n", p)
os.Exit(2)
}
}
}
}
if cfg.GOROOT == "" {
fmt.Fprintf(os.Stderr, "go: cannot find GOROOT directory: 'go' binary is trimmed and GOROOT is not set\n")
os.Exit(2)
}
if fi, err := os.Stat(cfg.GOROOT); err != nil || !fi.IsDir() {
fmt.Fprintf(os.Stderr, "go: cannot find GOROOT directory: %v\n", cfg.GOROOT)
os.Exit(2)
}
cmd, used := lookupCmd(args)
cfg.CmdName = strings.Join(args[:used], " ")
if len(cmd.Commands) > 0 {
if used >= len(args) {
help.PrintUsage(os.Stderr, cmd)
base.SetExitStatus(2)
base.Exit()
}
if args[used] == "help" {
// Accept 'go mod help' and 'go mod help foo' for 'go help mod' and 'go help mod foo'.
help.Help(os.Stdout, append(slices.Clip(args[:used]), args[used+1:]...))
base.Exit()
}
helpArg := ""
if used > 0 {
helpArg += " " + strings.Join(args[:used], " ")
}
cmdName := cfg.CmdName
if cmdName == "" {
cmdName = args[0]
}
fmt.Fprintf(os.Stderr, "go %s: unknown command\nRun 'go help%s' for usage.\n", cmdName, helpArg)
base.SetExitStatus(2)
base.Exit()
}
invoke(cmd, args[used-1:])
base.Exit()
}
// lookupCmd interprets the initial elements of args
// to find a command to run (cmd.Runnable() == true)
// or else a command group that ran out of arguments
// or had an unknown subcommand (len(cmd.Commands) > 0).
// It returns that command and the number of elements of args
// that it took to arrive at that command.
func lookupCmd(args []string) (cmd *base.Command, used int) {
cmd = base.Go
for used < len(args) {
c := cmd.Lookup(args[used])
if c == nil {
break
}
if c.Runnable() {
cmd = c
used++
break
}
if len(c.Commands) > 0 {
cmd = c
used++
if used >= len(args) || args[0] == "help" {
break
}
continue
}
// len(c.Commands) == 0 && !c.Runnable() => help text; stop at "help"
break
}
return cmd, used
}
func invoke(cmd *base.Command, args []string) {
// 'go env' handles checking the build config
if cmd != envcmd.CmdEnv {
buildcfg.Check()
if cfg.ExperimentErr != nil {
base.Fatal(cfg.ExperimentErr)
}
}
// Set environment (GOOS, GOARCH, etc) explicitly.
// In theory all the commands we invoke should have
// the same default computation of these as we do,
// but in practice there might be skew
// This makes sure we all agree.
cfg.OrigEnv = toolchain.FilterEnv(os.Environ())
cfg.CmdEnv = envcmd.MkEnv()
for _, env := range cfg.CmdEnv {
if os.Getenv(env.Name) != env.Value {
os.Setenv(env.Name, env.Value)
}
}
cmd.Flag.Usage = func() { cmd.Usage() }
if cmd.CustomFlags {
args = args[1:]
} else {
base.SetFromGOFLAGS(&cmd.Flag)
cmd.Flag.Parse(args[1:])
args = cmd.Flag.Args()
}
if cfg.DebugRuntimeTrace != "" {
f, err := os.Create(cfg.DebugRuntimeTrace)
if err != nil {
base.Fatalf("creating trace file: %v", err)
}
if err := rtrace.Start(f); err != nil {
base.Fatalf("starting event trace: %v", err)
}
defer func() {
rtrace.Stop()
}()
}
ctx := maybeStartTrace(context.Background())
ctx, span := trace.StartSpan(ctx, fmt.Sprint("Running ", cmd.Name(), " command"))
cmd.Run(ctx, cmd, args)
span.Done()
}
func init() {
base.Usage = mainUsage
}
func mainUsage() {
help.PrintUsage(os.Stderr, base.Go)
os.Exit(2)
}
func maybeStartTrace(pctx context.Context) context.Context {
if cfg.DebugTrace == "" {
return pctx
}
ctx, close, err := trace.Start(pctx, cfg.DebugTrace)
if err != nil {
base.Fatalf("failed to start trace: %v", err)
}
base.AtExit(func() {
if err := close(); err != nil {
base.Fatalf("failed to stop trace: %v", err)
}
})
return ctx
}
// handleChdirFlag handles the -C flag before doing anything else.
// The -C flag must be the first flag on the command line, to make it easy to find
// even with commands that have custom flag parsing.
// handleChdirFlag handles the flag by chdir'ing to the directory
// and then removing that flag from the command line entirely.
//
// We have to handle the -C flag this way for two reasons:
//
// 1. Toolchain selection needs to be in the right directory to look for go.mod and go.work.
//
// 2. A toolchain switch later on reinvokes the new go command with the same arguments.
// The parent toolchain has already done the chdir; the child must not try to do it again.
func handleChdirFlag() {
_, used := lookupCmd(os.Args[1:])
used++ // because of [1:]
if used >= len(os.Args) {
return
}
var dir string
switch a := os.Args[used]; {
default:
return
case a == "-C", a == "--C":
if used+1 >= len(os.Args) {
return
}
dir = os.Args[used+1]
os.Args = slices.Delete(os.Args, used, used+2)
case strings.HasPrefix(a, "-C="), strings.HasPrefix(a, "--C="):
_, dir, _ = strings.Cut(a, "=")
os.Args = slices.Delete(os.Args, used, used+1)
}
if err := os.Chdir(dir); err != nil {
base.Fatalf("go: %v", err)
}
}