mirror of https://go.googlesource.com/go
274 lines
6.4 KiB
Go
274 lines
6.4 KiB
Go
// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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//go:generate go test cmd/go -v -run=TestDocsUpToDate -fixdocs
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package main
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import (
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"cmd/go/internal/toolchain"
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"cmd/go/internal/workcmd"
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"context"
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"flag"
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"fmt"
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"internal/buildcfg"
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"log"
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"os"
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"path/filepath"
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"runtime"
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rtrace "runtime/trace"
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"strings"
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"cmd/go/internal/base"
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"cmd/go/internal/bug"
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"cmd/go/internal/cfg"
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"cmd/go/internal/clean"
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"cmd/go/internal/doc"
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"cmd/go/internal/envcmd"
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"cmd/go/internal/fix"
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"cmd/go/internal/fmtcmd"
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"cmd/go/internal/generate"
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"cmd/go/internal/get"
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"cmd/go/internal/help"
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"cmd/go/internal/list"
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"cmd/go/internal/modcmd"
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"cmd/go/internal/modfetch"
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"cmd/go/internal/modget"
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"cmd/go/internal/modload"
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"cmd/go/internal/run"
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"cmd/go/internal/test"
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"cmd/go/internal/tool"
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"cmd/go/internal/trace"
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"cmd/go/internal/version"
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"cmd/go/internal/vet"
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"cmd/go/internal/work"
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)
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func init() {
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base.Go.Commands = []*base.Command{
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bug.CmdBug,
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work.CmdBuild,
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clean.CmdClean,
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doc.CmdDoc,
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envcmd.CmdEnv,
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fix.CmdFix,
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fmtcmd.CmdFmt,
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generate.CmdGenerate,
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modget.CmdGet,
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work.CmdInstall,
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list.CmdList,
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modcmd.CmdMod,
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workcmd.CmdWork,
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run.CmdRun,
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test.CmdTest,
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tool.CmdTool,
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version.CmdVersion,
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vet.CmdVet,
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help.HelpBuildConstraint,
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help.HelpBuildmode,
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help.HelpC,
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help.HelpCache,
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help.HelpEnvironment,
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help.HelpFileType,
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modload.HelpGoMod,
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help.HelpGopath,
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get.HelpGopathGet,
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modfetch.HelpGoproxy,
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help.HelpImportPath,
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modload.HelpModules,
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modget.HelpModuleGet,
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modfetch.HelpModuleAuth,
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help.HelpPackages,
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modfetch.HelpPrivate,
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test.HelpTestflag,
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test.HelpTestfunc,
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modget.HelpVCS,
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}
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}
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var _ = go11tag
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func main() {
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log.SetFlags(0)
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toolchain.Select()
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flag.Usage = base.Usage
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flag.Parse()
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args := flag.Args()
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if len(args) < 1 {
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base.Usage()
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}
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if args[0] == "get" || args[0] == "help" {
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if !modload.WillBeEnabled() {
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// Replace module-aware get with GOPATH get if appropriate.
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*modget.CmdGet = *get.CmdGet
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}
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}
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cfg.CmdName = args[0] // for error messages
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if args[0] == "help" {
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help.Help(os.Stdout, args[1:])
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return
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}
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// Diagnose common mistake: GOPATH==GOROOT.
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// This setting is equivalent to not setting GOPATH at all,
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// which is not what most people want when they do it.
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if gopath := cfg.BuildContext.GOPATH; filepath.Clean(gopath) == filepath.Clean(runtime.GOROOT()) {
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fmt.Fprintf(os.Stderr, "warning: GOPATH set to GOROOT (%s) has no effect\n", gopath)
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} else {
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for _, p := range filepath.SplitList(gopath) {
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// Some GOPATHs have empty directory elements - ignore them.
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// See issue 21928 for details.
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if p == "" {
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continue
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}
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// Note: using HasPrefix instead of Contains because a ~ can appear
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// in the middle of directory elements, such as /tmp/git-1.8.2~rc3
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// or C:\PROGRA~1. Only ~ as a path prefix has meaning to the shell.
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if strings.HasPrefix(p, "~") {
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fmt.Fprintf(os.Stderr, "go: GOPATH entry cannot start with shell metacharacter '~': %q\n", p)
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os.Exit(2)
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}
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if !filepath.IsAbs(p) {
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if cfg.Getenv("GOPATH") == "" {
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// We inferred $GOPATH from $HOME and did a bad job at it.
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// Instead of dying, uninfer it.
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cfg.BuildContext.GOPATH = ""
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} else {
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fmt.Fprintf(os.Stderr, "go: GOPATH entry is relative; must be absolute path: %q.\nFor more details see: 'go help gopath'\n", p)
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os.Exit(2)
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}
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}
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}
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}
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if cfg.GOROOT == "" {
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fmt.Fprintf(os.Stderr, "go: cannot find GOROOT directory: 'go' binary is trimmed and GOROOT is not set\n")
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os.Exit(2)
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}
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if fi, err := os.Stat(cfg.GOROOT); err != nil || !fi.IsDir() {
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fmt.Fprintf(os.Stderr, "go: cannot find GOROOT directory: %v\n", cfg.GOROOT)
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os.Exit(2)
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}
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BigCmdLoop:
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for bigCmd := base.Go; ; {
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for _, cmd := range bigCmd.Commands {
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if cmd.Name() != args[0] {
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continue
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}
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if len(cmd.Commands) > 0 {
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bigCmd = cmd
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args = args[1:]
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if len(args) == 0 {
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help.PrintUsage(os.Stderr, bigCmd)
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base.SetExitStatus(2)
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base.Exit()
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}
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if args[0] == "help" {
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// Accept 'go mod help' and 'go mod help foo' for 'go help mod' and 'go help mod foo'.
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help.Help(os.Stdout, append(strings.Split(cfg.CmdName, " "), args[1:]...))
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return
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}
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cfg.CmdName += " " + args[0]
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continue BigCmdLoop
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}
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if !cmd.Runnable() {
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continue
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}
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invoke(cmd, args)
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base.Exit()
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return
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}
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helpArg := ""
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if i := strings.LastIndex(cfg.CmdName, " "); i >= 0 {
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helpArg = " " + cfg.CmdName[:i]
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}
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fmt.Fprintf(os.Stderr, "go %s: unknown command\nRun 'go help%s' for usage.\n", cfg.CmdName, helpArg)
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base.SetExitStatus(2)
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base.Exit()
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}
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}
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func invoke(cmd *base.Command, args []string) {
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// 'go env' handles checking the build config
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if cmd != envcmd.CmdEnv {
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buildcfg.Check()
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if cfg.ExperimentErr != nil {
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base.Fatal(cfg.ExperimentErr)
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}
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}
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// Set environment (GOOS, GOARCH, etc) explicitly.
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// In theory all the commands we invoke should have
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// the same default computation of these as we do,
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// but in practice there might be skew
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// This makes sure we all agree.
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cfg.OrigEnv = toolchain.FilterEnv(os.Environ())
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cfg.CmdEnv = envcmd.MkEnv()
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for _, env := range cfg.CmdEnv {
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if os.Getenv(env.Name) != env.Value {
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os.Setenv(env.Name, env.Value)
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}
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}
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cmd.Flag.Usage = func() { cmd.Usage() }
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if cmd.CustomFlags {
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args = args[1:]
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} else {
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base.SetFromGOFLAGS(&cmd.Flag)
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cmd.Flag.Parse(args[1:])
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args = cmd.Flag.Args()
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}
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if cfg.DebugRuntimeTrace != "" {
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f, err := os.Create(cfg.DebugRuntimeTrace)
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if err != nil {
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base.Fatalf("creating trace file: %v", err)
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}
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if err := rtrace.Start(f); err != nil {
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base.Fatalf("starting event trace: %v", err)
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}
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defer func() {
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rtrace.Stop()
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}()
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}
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ctx := maybeStartTrace(context.Background())
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ctx, span := trace.StartSpan(ctx, fmt.Sprint("Running ", cmd.Name(), " command"))
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cmd.Run(ctx, cmd, args)
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span.Done()
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}
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func init() {
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base.Usage = mainUsage
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}
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func mainUsage() {
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help.PrintUsage(os.Stderr, base.Go)
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os.Exit(2)
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}
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func maybeStartTrace(pctx context.Context) context.Context {
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if cfg.DebugTrace == "" {
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return pctx
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}
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ctx, close, err := trace.Start(pctx, cfg.DebugTrace)
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if err != nil {
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base.Fatalf("failed to start trace: %v", err)
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}
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base.AtExit(func() {
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if err := close(); err != nil {
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base.Fatalf("failed to stop trace: %v", err)
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}
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})
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return ctx
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}
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