Check for pending reboot with PowerShell

Andres Bohren

2020-07-03

Hallo zusammen,

Nachdem ich mich beim Exchange Update wieder mal durch den Wizard geklickt hatte und dann darauf hingewiesen wurde, dass noch ein Pending Reboot offen ist. Habe ich gedacht, das könnte man auch rasch vorher checken. Die folgende Tabelle habe ich im Internet gefunden. Daraus habe ich dann rasch ein PowerShell Script gebastelt.

How to Check for a Pending Reboot in the Registry (Windows)

https://adamtheautomator.com/pending-reboot-registry-windows/

KEY	VALUE	CONDITION
HKLM:\SOFTWARE\Microsoft\Updates	UpdateExeVolatile	Value is anything other than 0
HKLM:\SYSTEM\CurrentControlSet\Control\Session Manager	PendingFileRenameOperations	value exists
HKLM:\SYSTEM\CurrentControlSet\Control\Session Manager	PendingFileRenameOperations2	value exists
HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\Auto Update\RebootRequired	NA	key exists
HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\Services\Pending	NA	Any GUID subkeys exist
HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\Auto Update\PostRebootReporting	NA	key exists
HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce	DVDRebootSignal	value exists
HKLM:\Software\Microsoft\Windows\CurrentVersion\Component Based Servicing\RebootPending	NA	key exists
HKLM:\Software\Microsoft\Windows\CurrentVersion\Component Based Servicing\RebootInProgress	NA	key exists
HKLM:\Software\Microsoft\Windows\CurrentVersion\Component Based Servicing\PackagesPending	NA	key exists
HKLM:\SOFTWARE\Microsoft\ServerManager\CurrentRebootAttempts	NA	key exists
HKLM:\SYSTEM\CurrentControlSet\Services\Netlogon	JoinDomain	value exists
HKLM:\SYSTEM\CurrentControlSet\Services\Netlogon	AvoidSpnSet	value exists
HKLM:\SYSTEM\CurrentControlSet\Control\ComputerName\ActiveComputerName	ComputerName	Value ComputerName in HKLM:\SYSTEM\CurrentControlSet\Control\ComputerName\ComputerName is different

Daraus habe ich dann folgende PowerShell Script gemacht:

Das Script ist auch auf meinem GitHub Repo veröffentlicht: https://github.com/BohrenAn/GitHub_PowerShellScripts/blob/main/Exchange/CheckPendingReboot.ps1

###############################################################################
# Check-PendingReboot.ps1
# Andres Bohren / www.icewolf.ch / blog.icewolf.ch / a.bohren@icewolf.ch
# Version 1.0 / 03.06.2020 - Initial Version - Andres Bohren
# Version 1.1 / 27.04.2022 - Updated Script - Andres Bohren
###############################################################################
<#
.SYNOPSIS
    This Script checks diffrent Registry Keys and Values do determine if a Reboot is pending.

.DESCRIPTION
I found this Table on the Internet and decided to Write a Powershell Script to check if a Reboot is pending.
Not all Keys are checked. But feel free to extend the Script.

https://adamtheautomator.com/pending-reboot-registry-windows/
KEY VALUE CONDITION
HKLM:\SOFTWARE\Microsoft\Updates UpdateExeVolatile Value is anything other than 0
HKLM:\SYSTEM\CurrentControlSet\Control\Session Manager PendingFileRenameOperations value exists
HKLM:\SYSTEM\CurrentControlSet\Control\Session Manager PendingFileRenameOperations2 value exists
HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\Auto Update\RebootRequired NA key exists
HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\Services\Pending NA Any GUID subkeys exist
HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\Auto Update\PostRebootReporting NA key exists
HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce DVDRebootSignal value exists
HKLM:\Software\Microsoft\Windows\CurrentVersion\Component Based Servicing\RebootPending NA key exists
HKLM:\Software\Microsoft\Windows\CurrentVersion\Component Based Servicing\RebootInProgress NA key exists
HKLM:\Software\Microsoft\Windows\CurrentVersion\Component Based Servicing\PackagesPending NA key exists
HKLM:\SOFTWARE\Microsoft\ServerManager\CurrentRebootAttempts NA key exists
HKLM:\SYSTEM\CurrentControlSet\Services\Netlogon JoinDomain value exists
HKLM:\SYSTEM\CurrentControlSet\Services\Netlogon AvoidSpnSet value exists
HKLM:\SYSTEM\CurrentControlSet\Control\ComputerName\ActiveComputerName ComputerName Value ComputerName in HKLM:\SYSTEM\CurrentControlSet\Control\ComputerName\ComputerName is different

.EXAMPLE
./Check-PendingReboot.ps1

#>

function Test-RegistryValue {
    param (
     [parameter(Mandatory=$true)][ValidateNotNullOrEmpty()]$Path,
     [parameter(Mandatory=$true)] [ValidateNotNullOrEmpty()]$Value
    )
    try {
     Get-ItemProperty -Path $Path -Name $Value -EA Stop
     return $true
    } catch {
     return $false
    }
}

[bool]$PendingReboot = $false

#Check for Keys
If ((Test-Path -Path "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\Auto Update\RebootRequired") -eq $true)
{
    Write-Host "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\Auto Update\RebootRequired"
    $PendingReboot = $true
}

If ((Test-Path -Path "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\Auto Update\PostRebootReporting") -eq $true)
{
    Write-Host "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\Auto Update\PostRebootReporting"
    $PendingReboot = $true
}

If ((Test-Path -Path "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\Auto Update\RebootRequired") -eq $true)
{
    Write-Host "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\Auto Update\RebootRequired"
    $PendingReboot = $true
}

If ((Test-Path -Path "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Component Based Servicing\RebootPending") -eq $true)
{
    Write-Host "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Component Based Servicing\RebootPending"
    $PendingReboot = $true
}

If ((Test-Path -Path "HKLM:\SOFTWARE\Microsoft\ServerManager\CurrentRebootAttempts") -eq $true)
{
    Write-Host "HKLM:\SOFTWARE\Microsoft\ServerManager\CurrentRebootAttempts"
    $PendingReboot = $true
}

#Check for Values
If ((Test-RegistryValue -Path "HKLM:\Software\Microsoft\Windows\CurrentVersion\Component Based Servicing" -Value "RebootInProgress") -eq $true)
{
    Write-Host "HKLM:\Software\Microsoft\Windows\CurrentVersion\Component Based Servicing > RebootInProgress"
    $PendingReboot = $true
}

If ((Test-RegistryValue -Path "HKLM:\Software\Microsoft\Windows\CurrentVersion\Component Based Servicing" -Value "PackagesPending") -eq $true)
{
    Write-Host "HKLM:\Software\Microsoft\Windows\CurrentVersion\Component Based Servicing > PackagesPending"
    $PendingReboot = $true
}

If ((Test-RegistryValue -Path "HKLM:\SYSTEM\CurrentControlSet\Control\Session Manager" -Value "PendingFileRenameOperations") -eq $true)
{
    Write-Host "HKLM:\SYSTEM\CurrentControlSet\Control\Session Manager > PendingFileRenameOperations"
    $PendingReboot = $true
}

If ((Test-RegistryValue -Path "HKLM:\SYSTEM\CurrentControlSet\Control\Session Manager" -Value "PendingFileRenameOperations2") -eq $true)
{
    Write-Host "HKLM:\SYSTEM\CurrentControlSet\Control\Session Manager > PendingFileRenameOperations2"
    $PendingReboot = $true
}

If ((Test-RegistryValue -Path "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce" -Value "DVDRebootSignal") -eq $true)
{
    Write-Host "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce > DVDRebootSignal"
    $PendingReboot = $true
}

If ((Test-RegistryValue -Path "HKLM:\SYSTEM\CurrentControlSet\Services\Netlogon" -Value "JoinDomain") -eq $true)
{
    Write-Host "HKLM:\SYSTEM\CurrentControlSet\Services\Netlogon > JoinDomain"
    $PendingReboot = $true
}

If ((Test-RegistryValue -Path "HKLM:\SYSTEM\CurrentControlSet\Services\Netlogon" -Value "AvoidSpnSet") -eq $true)
{
    Write-Host "HKLM:\SYSTEM\CurrentControlSet\Services\Netlogon > AvoidSpnSet"
    $PendingReboot = $true
}

Write-Host "Reboot pending: $PendingReboot"

Und so sieht das Ergebnis dann aus.

Grüsse

Andres Bohren