added PatchParentDisks script

Scripts/1_Prereq.ps1

@@ -120,8 +120,8 @@ function  Get-WindowsBuildNumber {
         }
     }
 
-# add createparentdisks and DownloadLatestCU scripts to Parent Disks folder
-    $FileNames="CreateParentDisk","DownloadLatestCUs"
+# add createparentdisks, DownloadLatestCU and PatchParentDisks scripts to Parent Disks folder
+    $FileNames="CreateParentDisk","DownloadLatestCUs","PatchParentDisks"
     foreach ($filename in $filenames){
         $Path="$PSScriptRoot\ParentDisks\$FileName.ps1"
         If (Test-Path -Path $Path){

Tools/PatchParentDisks.ps1

@@ -0,0 +1,92 @@
+# Verify Running as Admin
+$isAdmin = ([Security.Principal.WindowsPrincipal] [Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole([Security.Principal.WindowsBuiltInRole] "Administrator")
+If (-not $isAdmin) {
+    Write-Host "-- Restarting as Administrator" -ForegroundColor Cyan ; Start-Sleep -Seconds 1
+
+    if($PSVersionTable.PSEdition -eq "Core") {
+        Start-Process pwsh.exe "-NoProfile -ExecutionPolicy Bypass -File `"$PSCommandPath`"" -Verb RunAs 
+    } else {
+        Start-Process powershell.exe "-NoProfile -ExecutionPolicy Bypass -File `"$PSCommandPath`"" -Verb RunAs 
+    }
+    
+    exit
+}
+
+#region Functions
+
+    function WriteInfo($message){
+        Write-Host $message
+    }
+
+    function WriteInfoHighlighted($message){
+        Write-Host $message -ForegroundColor Cyan
+    }
+
+    function WriteSuccess($message){
+        Write-Host $message -ForegroundColor Green
+    }
+
+    function WriteError($message){
+        Write-Host $message -ForegroundColor Red
+    }
+
+    function WriteErrorAndExit($message){
+        Write-Host $message -ForegroundColor Red
+        Write-Host "Press enter to continue ..."
+        Read-Host | Out-Null
+        Exit
+    }
+
+#endregion
+
+#region Ask for VHDs
+    WriteInfoHighlighted "Please select VHDx file(s)"
+    [reflection.assembly]::loadwithpartialname("System.Windows.Forms")
+    $VHDs = New-Object System.Windows.Forms.OpenFileDialog -Property @{
+        Multiselect = $true;
+        Title="Please select VHDx file(s)"
+    }
+    $VHDs.Filter = "vhdx files (*.vhdx)|*.vhdx|All files (*.*)|*.*" 
+    If($VHDs.ShowDialog() -eq "OK"){
+        WriteInfo  "File $($VHDs.FileName) selected"
+    }
+    if (!$VHDs.FileName){
+        WriteErrorAndExit  "VHDx was not selected... Exitting"
+    }
+#endregion
+
+#region ask for MSU packages
+    WriteInfoHighlighted "Please select msu packages you want to add to VHDx."
+    [reflection.assembly]::loadwithpartialname("System.Windows.Forms")
+    $msupackages = New-Object System.Windows.Forms.OpenFileDialog -Property @{
+        Multiselect = $true;
+        Title="Please select msu packages you want to add to VHDx."
+    }
+    $msupackages.Filter = "msu files (*.msu)|*.msu|All files (*.*)|*.*" 
+    If($msupackages.ShowDialog() -eq "OK"){
+        WriteInfoHighlighted  "Following patches selected:"
+        foreach ($filename in $msupackages.FileNames){
+            WriteInfo "`t $filename"
+        }
+    }else{
+        WriteErrorAndExit "No update package selected, exitting"
+    }
+#endregion
+
+# region mount and patch VHD
+    foreach ($VHD in $VHDs) {
+        WriteInfoHighlighted "Patching VHD $($VHD.Filename)"
+        $Mount=Mount-VHD $Vhd.FileName -Passthru
+        #Grab letter
+        $DriveLetter=(Get-Disk -Number $Mount.Number |Get-Partition | Where-Object Driveletter).DriveLetter
+        #Patch
+        foreach ($msupackage in $msupackages){
+            Add-WindowsPackage -PackagePath $msupackage.filename -Path "$($DriveLetter):\"
+        }
+        #Dismount
+        $Mount | Dismount-VHD
+    }
+#endregion
+
+WriteSuccess "Job Done. Press enter to continue..."
+Read-Host | Out-Null