PortValhalla/profiles/DerGeret/Windows/Setup.ps1

$env:WIN_COMPUTER_NAME = "DerGeret";
$env:SETUP_SCRIPT_NAME = [System.IO.Path]::GetRelativePath("$PSScriptRoot/../../..", "$PSScriptRoot/Restore.ps1");

$Global:SetupConfigPostprocessor = {
    param([xml] $config, [System.Xml.XmlNamespaceManager] $namespace)

    $setupComponent = $config.SelectSingleNode(
        "/ua:unattend/ua:settings[@pass='windowsPE']/ua:component[@name='Microsoft-Windows-Setup']",
        $namespace);

    $diskConfig = $setupComponent.SelectSingleNode("./ua:DiskConfiguration/ua:Disk", $namespace);
    $installationPartition = $setupComponent.SelectSingleNode("./ua:ImageInstall/ua:OSImage/ua:InstallTo/ua:PartitionID", $namespace);

    $newIndex = 2;
    $installationPartition.InnerText = "$($newIndex + 1)";
    $partitionCreationContainer = $diskConfig.SelectSingleNode("./ua:CreatePartitions", $namespace);
    $partitionCreations = $partitionCreationContainer.SelectNodes("./ua:CreatePartition", $namespace);
    $winPartition = ($partitionCreations | Select-Object -Last 1);
    $newPartition = $winPartition.CloneNode($true);

    $garbage = 0;

    foreach ($partition in $partitionCreations) {
        $order = [int]$partition.SelectSingleNode("./ua:Order", $namespace).InnerText;
        $garbage += [int]$partition.SelectSingleNode("./ua:Size", $namespace).InnerText;
        $newOrder = $order;

        if ($order -eq 2) {
            $newOrder--;
        } else {
            if ($order -ge $newIndex) {
                $newOrder++;
            }

            if ($order -lt 2) {
                $newOrder++;
            }
        }

        if ($order -ne $newOrder) {
            $partition.SelectSingleNode("./ua:Order", $namespace).InnerText = "$newOrder";
        }
    }

    # Add space before Windows installation... wha-!? For Linux, ofc! I use Arch Linux, btw.
    $size = $winPartition.OwnerDocument.CreateElement("Size");
    $size.InnerText = "$((1 * 1024 * 1024) - $garbage)";
    $winPartition.RemoveChild($winPartition.SelectSingleNode("./ua:Extend", $namespace));
    $winPartition.AppendChild($size);

    $newPartition.SelectSingleNode("./ua:Order", $namespace).InnerText = "$newIndex";
    $null = $partitionCreationContainer.AppendChild($newPartition);

    $partitionModificationContainer = $diskConfig.SelectSingleNode("./ua:ModifyPartitions", $namespace);
    $partitionModifications = $partitionModificationContainer.SelectNodes("./ua:ModifyPartition", $namespace);
    $newModification = $partitionModifications[1].CloneNode($true);
    $newModification.SelectSingleNode("./ua:Order", $namespace).InnerText = "$newIndex";
    $newModification.SelectSingleNode("./ua:PartitionID", $namespace).InnerText = "$newIndex";

    foreach ($partition in $partitionModifications) {
        $partitionID = [int]$partition.SelectSingleNode("./ua:PartitionID", $namespace).InnerText;
        $newID = $partitionID;

        if ($partitionID -eq 2) {
            $newID--;
        } else {
            if ($partitionID -ge $newIndex) {
                $newID++;
            }

            if ($partitionID -lt 2) {
                $newID++;
            }
        }

        if ($partitionID -ne $newID) {
            $partition.SelectSingleNode("./ua:PartitionID", $namespace).InnerText = "$newID";
            $partition.SelectSingleNode("./ua:Order", $namespace).InnerText = "$newID";
        }
    }

    $null = $partitionModificationContainer.AppendChild($newModification);
}

. "$PSScriptRoot/../../../scripts/Windows/OS/Setup.ps1";