Scanning Windows container images

windows-1.cs

using Registry;

var registryHive = new RegistryHive("/tmp/nanoserver/layer/Files/Windows/System32/config/SOFTWARE");
registryHive.ParseHive();
var currentVersion = registryHive.GetKey(@"Microsoft\Windows NT\CurrentVersion");
var fullVersion =
    $"{currentVersion.GetValue("CurrentMajorVersionNumber")}.{currentVersion.GetValue("CurrentMinorVersionNumber")}.{currentVersion.GetValue("CurrentBuildNumber")}.{currentVersion.GetValue("UBR")}";
Console.WriteLine(fullVersion);

windows-2.cs

var packages = registryHive.GetKey(@"Microsoft\Windows\CurrentVersion\Component Based Servicing\Packages");
var updatePackageRegex = new Regex(@"^Package_\d+_for_(KB\d+)~\w{16}~\w+~~((?:\d+\.){3}\d+)$");

var updates = new Dictionary<string, string>();
foreach (var packageKey in packages.SubKeys)
{
    if (!updatePackageRegex.IsMatch(packageKey.KeyName))
    {
        continue;
    }

    var currentState = packageKey.Values.Find(v => v.ValueName == "CurrentState")?.ValueData;

    // Installed
    if (currentState == "112")
    {
        var groups = updatePackageRegex.Match(packageKey.KeyName).Groups;
        updates[groups[1].Value] = groups[2].Value;
    }
}

foreach (var update in updates)
{
    Console.WriteLine($"{update.Key}: {update.Value}");
}