Allow running live scripts in debug mode

scripts/Common/Scripts/Config.ps1

@@ -280,6 +280,14 @@ $null = New-Module {
         Get-Config "valhalla.software.$Name";
     }
 
+    <#
+        .SYNOPSIS
+        Checks whether the running system is a QEMU virtual machine.
+    #>
+    function Test-Qemu {
+        ((Get-WmiObject win32_computersystem).Manufacturer) -eq "QEMU";
+    }
+
     <#
         .SYNOPSIS
         Checks whether the current user is the setup user.

scripts/Windows/OS/Install.ps1

@@ -1,4 +1,5 @@
 #!/bin/pwsh
+using namespace System.Management.Automation.Host;
 using namespace System.Security.Principal;
 
 . "$PSScriptRoot/../Scripts/Prerequisites.ps1";
@@ -77,6 +78,36 @@ $null = New-Module {
                             choco install -y powershell-core --install-arguments='"ADD_FILE_CONTEXT_MENU_RUNPOWERSHELL=1 ADD_EXPLORER_CONTEXT_MENU_OPENPOWERSHELL=1 REGISTER_MANIFEST=1 USER_MU=1 ENABLE_MU=1"';
                         };
 
+                        if ($env:DEBUG) {
+                            if (
+                                (Test-Qemu) -and
+                                ($Host.UI.PromptForChoice(
+                                    "Confirm",
+                                    "Do you wish to swap to live scripts?",
+                                    [ChoiceDescription[]]@(
+                                        [ChoiceDescription]::new("&No", "Use scripts stored in the virtual machine"),
+                                        [ChoiceDescription]::new("&Yes", "Use live scripts stored on the host")),
+                                    0) -eq 1)) {
+                                Install-ChocoPackage winfsp qemu-guest-agent;
+                                Get-Service VirtioFsSvc | Start-Service -PassThru | Set-Service -StartupType Automatic;
+
+                                while (-not (Test-Path Z:\)) {
+                                    Start-Sleep 0.1;
+                                }
+
+                                foreach ($name in @("CONFIG_MODULE", "INSTALLER_SCRIPT")) {
+                                    $variable = Get-Item "Env:\$name";
+
+                                    $path = Join-Path `
+                                        "Z:\Repositories\PortValhalla" `
+                                        ([System.IO.Path]::GetRelativePath("$PSScriptRoot/../../..", $variable.Value));
+
+                                    Set-Item "Env:\$name" $path;
+                                    Write-Host "The new value of ``$name`` is ``$path``";
+                                }
+                            }
+                        }
+
                         Restart-Intermediate;
                         return;
                     }