Golang function to determine whether a MacOS machine is 32 bit or 64 bit

get_arch_darwin.go

func GetArch() (string, *errors.ErrorCode) {
	cmd := exec.Command(
		"getconf",
		"LONG_BIT",
	)

	output, err := cmd.CombinedOutput()
	if err != nil {
		log.Printf("error getting arch: %v", err)
		return "", errors.New(errors.UnsupportedArchitecture)
	}

	is64 := strings.Index(string(output), "64")
	is32 := strings.Index(string(output), "32")

	if is32 < 0 && is64 < 0 {
		return "", errors.New(errors.UnsupportedArchitecture)
	}

	if is32 >= 0 {
		return "32", nil
	} else if is64 >= 0 {
		return "64", nil
	}
	return "", errors.New(errors.UnsupportedArchitecture)
}