Get Pending Reboot – remote machine

Use following scripts to find status of remote machine pending reboot

Function Get-PendingRebootStatus {
 
    [CmdletBinding()]
    Param (
        [Parameter(
            Mandatory = $false,
            ValueFromPipeline=$true,
            ValueFromPipelineByPropertyName=$true,
            Position=0
        )]
 
    [string[]]  $ComputerName = $env:COMPUTERNAME
    )
 
 
    BEGIN {}
 
    PROCESS {
        Foreach ($Computer in $ComputerName) {
            Try {
                $PendingReboot = $false
 
                $HKLM = [UInt32] "0x80000002"
                $WMI_Reg = [WMIClass] "\\$Computer\root\default:StdRegProv"
 
                if ($WMI_Reg) {
                    if (($WMI_Reg.EnumKey($HKLM,"SOFTWARE\Microsoft\Windows\CurrentVersion\Component Based Servicing\")).sNames -contains 'RebootPending') {$PendingReboot = $true}
                    if (($WMI_Reg.EnumKey($HKLM,"SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\Auto Update\")).sNames -contains 'RebootRequired') {$PendingReboot = $true}
 
                    #Checking for SCCM namespace
                    $SCCM_Namespace = Get-WmiObject -Namespace ROOT\CCM\ClientSDK -List -ComputerName $Computer -ErrorAction Ignore
                    if ($SCCM_Namespace) {
                        if (([WmiClass]"\\$Computer\ROOT\CCM\ClientSDK:CCM_ClientUtilities").DetermineIfRebootPending().RebootPending -eq 'True') {$PendingReboot = $true}
                    }
 
                    if ($PendingReboot -eq $true) {
                        [PSCustomObject]@{
                            ComputerName   = $Computer.ToUpper()
                            PendingReboot  = 'True'
                        }
                      } else {
                        [PSCustomObject]@{
                            ComputerName   = $Computer.ToUpper()
                            PendingReboot  = 'False'
                        }
                    }
                }
            } catch {
                $_.Exception.Message
 
            } finally {
                #Clearing Variables
                $WMI_Reg        = $null
                $SCCM_Namespace = $null
            }
        }
    }
 
    END {}
}

CmdletBinding()]
param(
    [Parameter(Mandatory)]
    [ValidateNotNullOrEmpty()]
    [string[]]$ComputerName,
    
    [Parameter()]
    [ValidateNotNullOrEmpty()]
    [pscredential]$Credential
)

$ErrorActionPreference = 'Stop'

$scriptBlock = {

    $VerbosePreference = $using:VerbosePreference
    function Test-RegistryKey {
        [OutputType('bool')]
        [CmdletBinding()]
        param
        (
            [Parameter(Mandatory)]
            [ValidateNotNullOrEmpty()]
            [string]$Key
        )
    
        $ErrorActionPreference = 'Stop'

        if (Get-Item -Path $Key -ErrorAction Ignore) {
            $true
        }
    }

    function Test-RegistryValue {
        [OutputType('bool')]
        [CmdletBinding()]
        param
        (
            [Parameter(Mandatory)]
            [ValidateNotNullOrEmpty()]
            [string]$Key,

            [Parameter(Mandatory)]
            [ValidateNotNullOrEmpty()]
            [string]$Value
        )
    
        $ErrorActionPreference = 'Stop'

        if (Get-ItemProperty -Path $Key -Name $Value -ErrorAction Ignore) {
            $true
        }
    }

    function Test-RegistryValueNotNull {
        [OutputType('bool')]
        [CmdletBinding()]
        param
        (
            [Parameter(Mandatory)]
            [ValidateNotNullOrEmpty()]
            [string]$Key,

            [Parameter(Mandatory)]
            [ValidateNotNullOrEmpty()]
            [string]$Value
        )
    
        $ErrorActionPreference = 'Stop'

        if (($regVal = Get-ItemProperty -Path $Key -Name $Value -ErrorAction Ignore) -and $regVal.($Value)) {
            $true
        }
    }

    # Added "test-path" to each test that did not leverage a custom function from above since
    # an exception is thrown when Get-ItemProperty or Get-ChildItem are passed a nonexistant key path
    $tests = @(
        { Test-RegistryKey -Key 'HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Component Based Servicing\RebootPending' }
        { Test-RegistryKey -Key 'HKLM:\Software\Microsoft\Windows\CurrentVersion\Component Based Servicing\RebootInProgress' }
        { Test-RegistryKey -Key 'HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\Auto Update\RebootRequired' }
        { Test-RegistryKey -Key 'HKLM:\Software\Microsoft\Windows\CurrentVersion\Component Based Servicing\PackagesPending' }
        { Test-RegistryKey -Key 'HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\Auto Update\PostRebootReporting' }
        { Test-RegistryValueNotNull -Key 'HKLM:\SYSTEM\CurrentControlSet\Control\Session Manager' -Value 'PendingFileRenameOperations' }
        { Test-RegistryValueNotNull -Key 'HKLM:\SYSTEM\CurrentControlSet\Control\Session Manager' -Value 'PendingFileRenameOperations2' }
        { 
            # Added test to check first if key exists, using "ErrorAction ignore" will incorrectly return $true
            'HKLM:\SOFTWARE\Microsoft\Updates' | Where-Object { test-path $_ -PathType Container } | ForEach-Object {            
                (Get-ItemProperty -Path $_ -Name 'UpdateExeVolatile' | Select-Object -ExpandProperty UpdateExeVolatile) -ne 0 
            }
        }
        { Test-RegistryValue -Key 'HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce' -Value 'DVDRebootSignal' }
        { Test-RegistryKey -Key 'HKLM:\SOFTWARE\Microsoft\ServerManager\CurrentRebootAttemps' }
        { Test-RegistryValue -Key 'HKLM:\SYSTEM\CurrentControlSet\Services\Netlogon' -Value 'JoinDomain' }
        { Test-RegistryValue -Key 'HKLM:\SYSTEM\CurrentControlSet\Services\Netlogon' -Value 'AvoidSpnSet' }
        {
            # Added test to check first if keys exists, if not each group will return $Null
            # May need to evaluate what it means if one or both of these keys do not exist
            ( 'HKLM:\SYSTEM\CurrentControlSet\Control\ComputerName\ActiveComputerName' | Where-Object { test-path $_ } | %{ (Get-ItemProperty -Path $_ ).ComputerName } ) -ne 
            ( 'HKLM:\SYSTEM\CurrentControlSet\Control\ComputerName\ComputerName' | Where-Object { Test-Path $_ } | %{ (Get-ItemProperty -Path $_ ).ComputerName } )
        }
        {
            # Added test to check first if key exists
            'HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\Services\Pending' | Where-Object { 
                (Test-Path $_) -and (Get-ChildItem -Path $_) } | ForEach-Object { $true }
        }
    )

    foreach ($test in $tests) {
        Write-Verbose "Running scriptblock: [$($test.ToString())]"
        if (& $test) {
            $true
            break
        }
    }
}

foreach ($computer in $ComputerName) {
    try {
        $connParams = @{
            'ComputerName' = $computer
        }
        if ($PSBoundParameters.ContainsKey('Credential')) {
            $connParams.Credential = $Credential
        }

        $output = @{
            ComputerName    = $computer
            IsPendingReboot = $false
        }

        $psRemotingSession = New-PSSession @connParams
        
        if (-not ($output.IsPendingReboot = Invoke-Command -Session $psRemotingSession -ScriptBlock $scriptBlock)) {
            $output.IsPendingReboot = $false
        }
        [pscustomobject]$output
    } catch {
        Write-Error -Message $_.Exception.Message
    } finally {
        if (Get-Variable -Name 'psRemotingSession' -ErrorAction Ignore) {
            $psRemotingSession | Remove-PSSession
        }
    }
}