Powershell function to determine if machine requires reboot.

RequiresReboot.ps1

<# 
Powershell function to determine if machine requires reboot.
by Michael Simmons : http://ilovepowershell.com/2015/09/10/how-to-check-if-a-server-needs-a-reboot/
Adapted from https://gist.github.com/altrive/5329377
Based on <http://gallery.technet.microsoft.com/scriptcenter/Get-PendingReboot-Query-bdb79542>
#>
function Test-PendingReboot
{
 if (Get-ChildItem "HKLM:\Software\Microsoft\Windows\CurrentVersion\Component Based Servicing\RebootPending" -EA Ignore) { return $true }
 if (Get-Item "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\Auto Update\RebootRequired" -EA Ignore) { return $true }
 if (Get-ItemProperty "HKLM:\SYSTEM\CurrentControlSet\Control\Session Manager" -Name PendingFileRenameOperations -EA Ignore) { return $true }
 try { 
 $util = [wmiclass]"\\.\root\ccm\clientsdk:CCM_ClientUtilities"
 $status = $util.DetermineIfRebootPending()
 if(($status -ne $null) -and $status.RebootPending){
 return $true
 }
 }catch{}
 
 return $false
}