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Powershell script to detect the Windows Azure SDK in Azure Cloud Service VM and fix the Powershell execution issue

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When you try to run Powershell commands on Windows Azure Cloud Service (PaaS) VM you may have seen exception as below:

 PS D:\Users\avkash> Add-PSSnapin Microsoft.WindowsAzure.ServiceRuntime

  Add-PSSnapin : Cannot add Windows PowerShell snap-in Microsoft.WindowsAzure.ServiceRuntime because it is already added.
 Verify the name of the snap-in and try again.
 At line:1 char:13
 + Add-PSSnapin <<<< Microsoft.WindowsAzure.ServiceRuntime
 + CategoryInfo : InvalidArgument: (Microsoft.WindowsAzure.ServiceRuntime:String) [Add-PSSnapin], PSArgume ntException
 + FullyQualifiedErrorId : AddPSSnapInRead,Microsoft.PowerShell.Commands.AddPSSnapinCommand

I have create a Powershell script which auto detect the Windows Azure SDK version runtime in the Azure VM and then fix this problem in registry and set the Role Busy as below:

 [xml] $RoleModelXml = Get-Content "E:\RoleModel.xml"
 $sdkVersion = $RoleModelXml.RoleModel.Version
 Write-Output ("---------------------------------------")
 Write-Output("Your SDK Version is: " + $sdkVersion)
 Write-Output("---------------------------------------")
 
 Write-Output("")
 Write-Output("Now Setting SDK Version in Registry: " + $sdkVersion.substring(0,3))
 Write-Output("---------------------------------------")
 
 $finalSDKVersion = $sdkVersion.substring(0,3)
 $fixedAssemblyName = "Microsoft.WindowsAzure.ServiceRuntime.Commands, Version=" + $finalSDKVersion + ".0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
 
 $Registry_Key = “HKLM:\Software\Microsoft\PowerShell\1\PowerShellSnapIns\Microsoft.WindowsAzure.ServiceRuntime\"
 Set-ItemProperty -path $Registry_Key -name Version -value $finalSDKVersion
 Set-ItemProperty -path $Registry_Key -name PowerShellVersion -value 2.0
 Set-ItemProperty -path $Registry_Key -name AssemblyName -value $fixedAssemblyName
 
 
 #Validate the registry
 Write-Output("*** --- Validating the registry change *** ----")
 Get-ItemProperty -path $Registry_Key -name Version
 Get-ItemProperty -path $Registry_Key -name PowerShellVersion
 Get-ItemProperty -path $Registry_Key -name AssemblyName
 
 
 $AzureSnapIn = "Microsoft.WindowsAzure.ServiceRuntime"
 
 if ( (Get-PSSnapin -Name $AzureSnapIn -ErrorAction SilentlyContinue) -eq $null )
 {
 
 Add-PsSnapin $AzureSnapIn
 }
 else
 {
 $message = "PsSnapin " + $AzureSnapIn + " already loaded!!"
 Write-Output($message); 
 }
 
 
 #Settings the Role busy
 Write-Output("*** --- Setting Role Busy *** ----")
 Set-RoleInstanceStatus -busy