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Reboot Pending Status Script

This will query a list of computers to generate a report on pending reboots status for each computer, it checks CBServicing, WindowsUpdate, CCMClientSDK, Pending File Rename


Param ( [string]$File = 'computers.txt' )

function Split-Collection {
        [Parameter(ValueFromPipeline=$true)] $Collection,
        [Parameter(Mandatory=$true)][ValidateRange(1, 247483647)][int] $ChunkSize
    begin {
        $Ctr = 0
        $Arrays = @()
        $TempArray = @()
    process {
        if (++$Ctr -eq $ChunkSize) {
            $Ctr = 0
            $Arrays += , @($TempArray + $_)
            $TempArray = @()
        $TempArray += $_
    end {
        if ($TempArray) { $Arrays += , $TempArray }

Function Get-PendingReboot
    Gets the pending reboot status on a local or remote computer.

    This function will query the registry on a local or remote computer and determine if the
    system is pending a reboot, from either Microsoft Patching or a Software Installation.
    For Windows 2008+ the function will query the CBS registry key as another factor in determining
    pending reboot state.  "PendingFileRenameOperations" and "Auto Update\RebootRequired" are observed
    as being consistant across Windows Server 2003 & 2008.
    CBServicing = Component Based Servicing (Windows 2008)
    WindowsUpdate = Windows Update / Auto Update (Windows 2003 / 2008)
    CCMClientSDK = SCCM 2012 Clients only (DetermineIfRebootPending method) otherwise $null value
    PendFileRename = PendingFileRenameOperations (Windows 2003 / 2008)

.PARAMETER ComputerName
    A single Computer or an array of computer names.  The default is localhost ($env:COMPUTERNAME).

    A single path to send error data to a log file.

    PS C:\> Get-PendingReboot -ComputerName (Get-Content C:\ServerList.txt) | Format-Table -AutoSize
    Computer CBServicing WindowsUpdate CCMClientSDK PendFileRename PendFileRenVal RebootPending
    -------- ----------- ------------- ------------ -------------- -------------- -------------
    DC01           False         False                       False                        False
    DC02           False         False                       False                        False
    FS01           False         False                       False                        False

    This example will capture the contents of C:\ServerList.txt and query the pending reboot
    information from the systems contained in the file and display the output in a table. The
    null values are by design, since these systems do not have the SCCM 2012 client installed,
    nor was the PendingFileRenameOperations value populated.

    PS C:\> Get-PendingReboot
    Computer       : WKS01
    CBServicing    : False
    WindowsUpdate  : True
    CCMClient      : False
    PendFileRename : False
    PendFileRenVal : 
    RebootPending  : True
    This example will query the local machine for pending reboot information.
    PS C:\> $Servers = Get-Content C:\Servers.txt
    PS C:\> Get-PendingReboot -Computer $Servers | Export-Csv C:\PendingRebootReport.csv -NoTypeInformation
    This example will create a report that contains pending reboot information.

    Component-Based Servicing:
    PendingFileRename/Auto Update:

    SCCM 2012/CCM_ClientSDK:

    Author:  Brian Wilhite
    Date:    08/29/2012
    PSVer:   2.0/3.0
    Updated: 05/30/2013
    UpdNote: Added CCMClient property - Used with SCCM 2012 Clients only
             Added ValueFromPipelineByPropertyName=$true to the ComputerName Parameter
             Removed $Data variable from the PSObject - it is not needed
             Bug with the way CCMClientSDK returned null value if it was false
             Removed unneeded variables
             Added PendFileRenVal - Contents of the PendingFileRenameOperations Reg Entry


    # Adjusting ErrorActionPreference to stop on all errors, since using [Microsoft.Win32.RegistryKey]
        # does not have a native ErrorAction Parameter, this may need to be changed if used within another
        # function.
    $TempErrAct = $ErrorActionPreference
    $ErrorActionPreference = "Stop"
  }#End Begin Script Block
    Foreach ($Computer in $ComputerName)
            # Setting pending values to false to cut down on the number of else statements
            $PendFileRename,$Pending,$SCCM = $false,$false,$false
                        # Setting CBSRebootPend to null since not all versions of Windows has this value
                        $CBSRebootPend = $null
            # Querying WMI for build version
            $WMI_OS = Get-WmiObject -Class Win32_OperatingSystem -Property BuildNumber, CSName -ComputerName $Computer

            # Making registry connection to the local/remote computer
            $RegCon = [Microsoft.Win32.RegistryKey]::OpenRemoteBaseKey([Microsoft.Win32.RegistryHive]"LocalMachine",$Computer)
            # If Vista/2008 & Above query the CBS Reg Key
            If ($WMI_OS.BuildNumber -ge 6001)
                $RegSubKeysCBS = $RegCon.OpenSubKey("SOFTWARE\Microsoft\Windows\CurrentVersion\Component Based Servicing\").GetSubKeyNames()
                $CBSRebootPend = $RegSubKeysCBS -contains "RebootPending"
              }#End If ($WMI_OS.BuildNumber -ge 6001)
            # Query WUAU from the registry
            $RegWUAU = $RegCon.OpenSubKey("SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\Auto Update\")
            $RegWUAURebootReq = $RegWUAU.GetSubKeyNames()
            $WUAURebootReq = $RegWUAURebootReq -contains "RebootRequired"
            # Query PendingFileRenameOperations from the registry
            $RegSubKeySM = $RegCon.OpenSubKey("SYSTEM\CurrentControlSet\Control\Session Manager\")
            $RegValuePFRO = $RegSubKeySM.GetValue("PendingFileRenameOperations",$null)
            # Closing registry connection
            # If PendingFileRenameOperations has a value set $RegValuePFRO variable to $true
            If ($RegValuePFRO)
                $PendFileRename = $true

              }#End If ($RegValuePFRO)

            # Determine SCCM 2012 Client Reboot Pending Status
            # To avoid nested 'if' statements and unneeded WMI calls to determine if the CCM_ClientUtilities class exist, setting EA = 0
            $CCMClientSDK = $null
                        $CCMSplat = @{
                        $CCMClientSDK = Invoke-WmiMethod @CCMSplat
            If ($CCMClientSDK)
                                If ($CCMClientSDK.ReturnValue -ne 0)
                        Write-Warning "Error: DetermineIfRebootPending returned error code $($CCMClientSDK.ReturnValue)"
                      }#End If ($CCMClientSDK -and $CCMClientSDK.ReturnValue -ne 0)

                    If ($CCMClientSDK.IsHardRebootPending -or $CCMClientSDK.RebootPending)
                        $SCCM = $true

                      }#End If ($CCMClientSDK.IsHardRebootPending -or $CCMClientSDK.RebootPending)

                            }#End If ($CCMClientSDK)
                                $SCCM = $null

                        # If any of the variables are true, set $Pending variable to $true
            If ($CBSRebootPend -or $WUAURebootReq -or $SCCM -or $PendFileRename)
                $Pending = $true

              }#End If ($CBS -or $WUAU -or $PendFileRename)
            # Creating Custom PSObject and Select-Object Splat
                        $SelectSplat = @{
            New-Object -TypeName PSObject -Property @{
                } | Select-Object @SelectSplat

          }#End Try

            Write-Warning "$Computer`: $_"
            # If $ErrorLog, log the file to a user specified location/path
            If ($ErrorLog)
                Out-File -InputObject "$Computer`,$_" -FilePath $ErrorLog -Append

              }#End If ($ErrorLog)
          }#End Catch
      }#End Foreach ($Computer in $ComputerName)
  }#End Process
    # Resetting ErrorActionPref
    $ErrorActionPreference = $TempErrAct
  }#End End
}#End Function

Workflow Reboot-Pending {
  param ($computers)
  foreach -parallel ($computer in $computers) {
    $online = Test-Connection -ComputerName $computer -Count 1 -Quiet
    if ($online -eq $true) {
      $tmp = Get-PendingReboot -ComputerName $computer -ErrorAction SilentlyContinue
      if ($tmp.RebootPending -eq $true) {
        Add-Content -Path reboot.txt -Value $computer
        $reboot = 'True'
      } else {
        $reboot = 'False'
    $obj = New-Object -TypeName PSObject -Property @{
      ComputerName 	= $computer
      Online			= $online
      Reboot			= $reboot

#get current directoy
$scriptpath = $MyInvocation.MyCommand.Path
$currentdir = Split-Path $scriptpath

$List = Get-Content $($currentdir + '\' + $file)
$List | Split-Collection -ChunkSize 15 | %{ Reboot-Pending $_ } | Select -Property ComputerName, Online, Reboot | Export-Csv -Path $("PendingReboot-$(Get-Date -Format 'yyyyMMdd-HHmm').csv") -NoTypeInformation