1 files changed, 235 insertions, 0 deletions
diff --git a/src/cmd/go/main.go b/src/cmd/go/main.go
new file mode 100644
index 0000000..9cc44da
--- /dev/null
+++ b/src/cmd/go/main.go
@@ -0,0 +1,235 @@
+// 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 ./mkalldocs.sh
+
+package main
+
+import (
+	"context"
+	"flag"
+	"fmt"
+	"log"
+	"os"
+	"path/filepath"
+	"runtime"
+	"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,
+		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,
+	}
+}
+
+func main() {
+	_ = go11tag
+	flag.Usage = base.Usage
+	flag.Parse()
+	log.SetFlags(0)
+
+	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 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)
+	}
+
+	// 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 = os.Environ()
+	cfg.CmdEnv = envcmd.MkEnv()
+	for _, env := range cfg.CmdEnv {
+		if os.Getenv(env.Name) != env.Value {
+			os.Setenv(env.Name, env.Value)
+		}
+	}
+
+BigCmdLoop:
+	for bigCmd := base.Go; ; {
+		for _, cmd := range bigCmd.Commands {
+			if cmd.Name() != args[0] {
+				continue
+			}
+			if len(cmd.Commands) > 0 {
+				bigCmd = cmd
+				args = args[1:]
+				if len(args) == 0 {
+					help.PrintUsage(os.Stderr, bigCmd)
+					base.SetExitStatus(2)
+					base.Exit()
+				}
+				if args[0] == "help" {
+					// Accept 'go mod help' and 'go mod help foo' for 'go help mod' and 'go help mod foo'.
+					help.Help(os.Stdout, append(strings.Split(cfg.CmdName, " "), args[1:]...))
+					return
+				}
+				cfg.CmdName += " " + args[0]
+				continue BigCmdLoop
+			}
+			if !cmd.Runnable() {
+				continue
+			}
+			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()
+			}
+			ctx := maybeStartTrace(context.Background())
+			ctx, span := trace.StartSpan(ctx, fmt.Sprint("Running ", cmd.Name(), " command"))
+			cmd.Run(ctx, cmd, args)
+			span.Done()
+			base.Exit()
+			return
+		}
+		helpArg := ""
+		if i := strings.LastIndex(cfg.CmdName, " "); i >= 0 {
+			helpArg = " " + cfg.CmdName[:i]
+		}
+		fmt.Fprintf(os.Stderr, "go %s: unknown command\nRun 'go help%s' for usage.\n", cfg.CmdName, helpArg)
+		base.SetExitStatus(2)
+		base.Exit()
+	}
+}
+
+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
+}