func OperatingSystem()

in providers/windows/os_windows.go [30:95]
57 lines of code
12 McCabe index (conditional complexity)

func OperatingSystem() (*types.OSInfo, error) {
	const key = registry.LOCAL_MACHINE
	const path = `SOFTWARE\Microsoft\Windows NT\CurrentVersion`
	const flags = registry.READ | registry.WOW64_64KEY

	k, err := registry.OpenKey(key, path, flags)
	if err != nil {
		return nil, fmt.Errorf(`failed to open HKLM\%v: %w`, path, err)
	}
	defer k.Close()

	osInfo := &types.OSInfo{
		Type:     "windows",
		Family:   "windows",
		Platform: "windows",
	}
	name := "ProductName"
	osInfo.Name, _, err = k.GetStringValue(name)
	if err != nil {
		return nil, fmt.Errorf(`failed to get value of HKLM\%v\%v: %w`, path, name, err)
	}

	// Newer versions (Win 10 and 2016) have CurrentMajor/CurrentMinor.
	major, _, majorErr := k.GetIntegerValue("CurrentMajorVersionNumber")
	minor, _, minorErr := k.GetIntegerValue("CurrentMinorVersionNumber")
	if majorErr == nil && minorErr == nil {
		osInfo.Major = int(major)
		osInfo.Minor = int(minor)
		osInfo.Version = fmt.Sprintf("%d.%d", major, minor)
	} else {
		name = "CurrentVersion"
		osInfo.Version, _, err = k.GetStringValue(name)
		if err != nil {
			return nil, fmt.Errorf(`failed to get value of HKLM\%v\%v: %w`, path, name, err)
		}
		parts := strings.SplitN(osInfo.Version, ".", 3)
		for i, p := range parts {
			switch i {
			case 0:
				osInfo.Major, _ = strconv.Atoi(p)
			case 1:
				osInfo.Minor, _ = strconv.Atoi(p)
			}
		}
	}

	name = "CurrentBuild"
	currentBuild, _, err := k.GetStringValue(name)
	if err != nil {
		return nil, fmt.Errorf(`failed to get value of HKLM\%v\%v: %w`, path, name, err)
	}
	osInfo.Build = currentBuild

	// Update Build Revision (optional)
	name = "UBR"
	updateBuildRevision, _, err := k.GetIntegerValue(name)
	if err != nil && err != registry.ErrNotExist {
		return nil, fmt.Errorf(`failed to get value of HKLM\%v\%v: %w`, path, name, err)
	} else {
		osInfo.Build = fmt.Sprintf("%v.%d", osInfo.Build, updateBuildRevision)
	}

	fixWindows11Naming(currentBuild, osInfo)

	return osInfo, nil
}