}
}

// Getenv gets the value for the configuration key.
// It consults the operating system environment
// and then the go/env file.
// If Getenv is called for a key that cannot be set
// in the go/env file (for example GODEBUG), it panics.
// This ensures that CanGetenv is accurate, so that
// 'go env -w' stays in sync with what Getenv can retrieve.
func Getenv(key string) string {
	if !CanGetenv(key) {

		homeEnvName() + "=/no-home",
		"CCACHE_DISABLE=1", // ccache breaks with non-existent HOME
		"GOARCH=" + runtime.GOARCH,
		"TESTGO_GOHOSTARCH=" + goHostArch,
		"GOCACHE=" + testGOCACHE,
		"GOCOVERDIR=" + os.Getenv("GOCOVERDIR"),
		"GODEBUG=" + os.Getenv("GODEBUG"),
		"GOEXE=" + cfg.ExeSuffix,
		"GOEXPERIMENT=" + os.Getenv("GOEXPERIMENT"),
		"GOOS=" + runtime.GOOS,

	defer os.Setenv("GOROOT", os.Getenv("GOROOT"))
	os.Setenv("GOROOT", goroot_bootstrap)

	defer os.Setenv("GOPATH", os.Getenv("GOPATH"))
	os.Setenv("GOPATH", workspace)

	defer os.Setenv("GOBIN", os.Getenv("GOBIN"))
	os.Setenv("GOBIN", "")

	os.Setenv("GOOS", "")
	os.Setenv("GOHOSTOS", "")
	os.Setenv("GOARCH", "")
	os.Setenv("GOHOSTARCH", "")

		{Name: "GOSUMDB", Value: cfg.GOSUMDB, Changed: cfg.GOSUMDBChanged},
		{Name: "GOTMPDIR", Value: cfg.Getenv("GOTMPDIR")},
		{Name: "GOTOOLCHAIN"},
		{Name: "GOTOOLDIR", Value: build.ToolDir},
		{Name: "GOVCS", Value: cfg.GOVCS},
		{Name: "GOVERSION", Value: runtime.Version()},
		{Name: "GODEBUG", Value: os.Getenv("GODEBUG")},
		{Name: "GOTELEMETRY", Value: telemetry.Mode()},
		{Name: "GOTELEMETRYDIR", Value: telemetry.Dir()},

	devID = getenv("GOIOS_DEV_ID")

	// e.g. Z8B3JBXXXX.org.golang.sample, Z8B3JBXXXX prefix is available at
	// https://developer.apple.com/membercenter/index.action#accountSummary as Team ID.
	appID = getenv("GOIOS_APP_ID")

	// e.g. Z8B3JBXXXX, available at
	// https://developer.apple.com/membercenter/index.action#accountSummary as Team ID.
	teamID = getenv("GOIOS_TEAM_ID")

// $HOME is not set, falls back to os.TempDir().
func setTmpDir(ui plugin.UI) (string, error) {
	var dirs []string
	if profileDir := os.Getenv("PPROF_TMPDIR"); profileDir != "" {
		dirs = append(dirs, profileDir)
	}
	if homeDir := os.Getenv(homeEnv()); homeDir != "" {
		dirs = append(dirs, filepath.Join(homeDir, "pprof"))
	}
	dirs = append(dirs, os.TempDir())
	for _, tmpDir := range dirs {

	cgoCflags := os.Getenv("CGO_CFLAGS")
	if cgoCflags != "" {
		cgoCflags += " "
	}
	cgoCflags += "-I" + tmpdir

	cgoLdflags := os.Getenv("CGO_LDFLAGS")
	if cgoLdflags != "" {
		cgoLdflags += " "
	}
	cgoLdflags += "-L" + tmpdir + " -ltestgo2c2go"

	goenv := []string{"CGO_CFLAGS=" + cgoCflags, "CGO_LDFLAGS=" + cgoLdflags}

	ldLibPath := os.Getenv("LD_LIBRARY_PATH")
	if ldLibPath != "" {

	}

	// 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" {

	}

	if cfg.BuildP <= 0 {
		base.Fatalf("go: -p must be a positive integer: %v\n", cfg.BuildP)
	}

	// Make sure CC, CXX, and FC are absolute paths.
	for _, key := range []string{"CC", "CXX", "FC"} {
		value := cfg.Getenv(key)
		args, err := quoted.Split(value)
		if err != nil {
			base.Fatalf("go: %s environment variable could not be parsed: %v", key, err)
		}
		if len(args) == 0 {
			continue
		}
		path := args[0]

	// 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:])