PortValhalla/scripts/Windows/OS/Setup.ps1

#!/bin/pwsh
$null = $env:WIN_COMPUTER_NAME;
$null = $env:SETUP_SCRIPT_NAME;

# Find `winiso` installation medium
$drives = & wmic volume get "DriveLetter,Label";
$drive = $($($drives | Select-String -Pattern "winiso") -split "\s+")[0];
[xml]$unattendedConfig = [xml]::new();
$unattendedConfig.PreserveWhitespace = $true;

$readerSettings = [System.Xml.XmlReaderSettings]::new();
$readerSettings.IgnoreComments = $true;
$reader = [System.Xml.XmlReader]::Create("$PSScriptRoot/../Resources/Autounattend.template.xml", $readerSettings);

$unattendedConfig.Load($reader);
$namespace = New-Object -TypeName "Xml.XmlNamespaceManager" -ArgumentList $unattendedConfig.NameTable;
$namespace.AddNamespace("ua", $unattendedConfig.DocumentElement.NamespaceURI);

function Get-PassSettings {
    [OutputType([xml])]
    param(
        [string] $passName
    )

    return $unattendedConfig.SelectSingleNode("/ua:unattend/ua:settings[@pass='$passName']", $namespace);
}

# Adjust unattended settings
$specializeSettings = Get-PassSettings "specialize";
$specializeSettings.SelectSingleNode("./ua:component[@name='Microsoft-Windows-Shell-Setup']/ua:ComputerName", $namespace).InnerText = "$env:WIN_COMPUTER_NAME";

# Execute corresponding installer script after startup
$oobeSystemSettings = Get-PassSettings "oobeSystem";
$installationCommand = $oobeSystemSettings.SelectSingleNode("./ua:component/ua:FirstLogonCommands/ua:SynchronousCommand[last()]", $namespace);
$newCommand = $installationCommand.ParentNode.AppendChild($installationCommand.CloneNode($true));

$newCommand.SelectSingleNode("./ua:CommandLine", $namespace).InnerText = `
    "powershell -Command " + `
    $(Get-Content "$PSScriptRoot/InitialBoot.ps1") + `
    "; pwsh '$([System.IO.Path]::GetRelativePath("$PSScriptRoot/../../..", $env:SETUP_SCRIPT_NAME))';";

$orderElement = $newCommand.SelectSingleNode("./ua:Order", $namespace);
$orderElement.InnerText = ([int]($orderElement.InnerText) + 1);
$newCommand.SelectSingleNode("./ua:Description", $namespace).InnerText = "Install PowerShell Core and git and run setup script";

if (Get-Command Initialize-SetupConfig) {
    Initialize-SetupConfig $unattendedConfig $namespace;
}

$unattendedConfig.PreserveWhitespace = $true;
$unattendedConfig.Save("$drive/Autounattend.xml");

Write-Warning "Attention: This program will completely wipe your current disk #1 and install Windows on it. Are you sure you want to do this?"
Read-Host -Prompt "Hit enter to continue or CTRL+C to abort"
& "$drive\setup.exe";