Automates installation of PowerShell 2 on Server 2008

Install-WMF2.ps1

<#	
	.NOTES
	===========================================================================
	 Created with: 	SAPIEN Technologies, Inc., PowerShell Studio 2015 v4.2.89
	 Created on:   	7/30/2015 12:48 PM
	 Created by:   	Colin Squier <hexalon@gmail.com
	 Filename:     	Install-WMF2.ps1
	===========================================================================
	.DESCRIPTION
		Automates installation of PowerShell 2.
#>

<#
.SYNOPSIS
	Returns the path of the executing script's directory.

.DESCRIPTION
	Sapien's implementation of the variable $HostInvocation
	causes a conflict the with the system's variable.
		
	.EXAMPLE
		PS C:\> Get-ScriptDirectory
		
	.NOTES
		Work around for handling Sapien's custom host environment.
#>
function Get-ScriptDirectory
{
	if ($HostInvocation -ne $null)
	{
		Split-Path $HostInvocation.MyCommand.path
	}
	else
	{
		#$Invocation = (Get-Variable MyInvocation -Scope 1).Value
		#Split-Path $Invocation.MyInvocation.path
		Split-Path $script:MyInvocation.MyCommand.Path
	}
}

If (-NOT ([Security.Principal.WindowsPrincipal][Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole(`
[Security.Principal.WindowsBuiltInRole] "Administrator"))
{
	Write-Warning "You do not have Administrator rights to run this script!`nPlease re-run this script as an Administrator!"
	Break
}

$RequiredOSVersion = "6.0.6002"
$OS = (Get-WmiObject -Class Win32_OperatingSystem)
$scriptDirectory = Get-ScriptDirectory
$Source = (Split-Path -Path $scriptDirectory -Parent)
$PackagePath = (Join-Path -Path $Source -ChildPath "ComputerSetup\WMF2")
$File32 = "Windows6.0-KB968930-x86.msu"
$File64 = "Windows6.0-KB968930-x64.msu"
$Product = "Windows Management Framework 2"

$FullPath32 = Join-Path -Path $PackagePath -ChildPath $File32
$FullPath64 = Join-Path -Path $PackagePath -ChildPath $File64

$Version = ([Environment]::Version).Major


If ($Version -ge 2)
{
	Write-Host "$Product or later already installed." -ForegroundColor Green
	break
}

If ([version]$OS.Version -ne $RequiredOSVersion)
{
	Write-Host "The user's computer does not meet system requirements." -ForegroundColor Red
	break
}

$HotFix = (Get-HotFix | Where-Object { $_.HotfixID -eq 'KB968930' })

if ($HotFix -ne $null)
{
	Write-Host "$Product or later already installed." -ForegroundColor Green
	break
}

switch ($OS.OSArchitecture)
{
	'32-bit' { $InstallPath = $FullPath32 }
	'64-bit' { $InstallPath = $FullPath64 }
}

Write-Host "Installing $Product"
$UpdateFile = Start-Process -FilePath "wusa.exe" -ArgumentList "`"$InstallPath`" /quiet /norestart" -Wait -Passthru
$ExitCode = $UpdateFile.ExitCode
Write-Host "$Product installer exit code: $ExitCode"
switch ($ExitCode)
{
	0 { Write-Host "Installation completed successfully." -ForegroundColor Green }
	1602 { Write-Host "The user canceled installation." -ForegroundColor White }
	1603 { Write-Host "A fatal error occurred during installation." -ForegroundColor Red }
	1641 { Write-Host "A restart is required to complete the installation. This message indicates success." -ForegroundColor Yellow }
	3010 { Write-Host "A restart is required to complete the installation. This message indicates success." -ForegroundColor Yellow }
	5100 { Write-Host "The user's computer does not meet system requirements." -ForegroundColor Red }
}