Added Error Checking

Added error checking to verify if Dell Command | Update is installed and to exit with an error code one if not.

ZTIDellDriverUpdate.ps1

@@ -15,37 +15,52 @@
 #>
 [CmdletBinding()]
 param ()
-#Delete old logs if they exist
-Remove-Item -Path ($env:windir + '\temp\ActivityLog.xml') -ErrorAction SilentlyContinue -Force
-Remove-Item -Path ($env:windir + '\temp\inventory.xml') -ErrorAction SilentlyContinue -Force
-#Update the system with the latest drivers while also writing log files to the %windir%\temp directory
-$ErrCode = (Start-Process -FilePath ((Get-ChildItem -Path $env:ProgramFiles, ${env:ProgramFiles(x86)} -Filter 'dcu-cli.exe' -Recurse).FullName) -ArgumentList ('/log ' + $env:windir + '\temp') -Wait).ExitCode
-#Read the ActivityLog.xml file
-$File = (Get-Content -Path ($env:windir + '\temp\ActivityLog.xml')).Trim()
-#if no updates were found or updates were applied and no required reboot is necessary, then delete the log files
-If (('<message>CLI: No application component updates found.</message>' -in $File) -and (('<message>CLI: No available updates can be installed.</message>' -in $File) -or ('<message>CLI: No updates are available.</message>' -in $File))) {
+
+#Verify Dell Command | Update exists
+If ((Test-Path -Path (Get-ChildItem -Path $env:ProgramFiles, ${env:ProgramFiles(x86)} -filter dcu-cli.exe -Recurse -ErrorAction SilentlyContinue).FullName) -eq $true) {
+	#Delete old logs if they exist
 	Remove-Item -Path ($env:windir + '\temp\ActivityLog.xml') -ErrorAction SilentlyContinue -Force
 	Remove-Item -Path ($env:windir + '\temp\inventory.xml') -ErrorAction SilentlyContinue -Force
-	Remove-Item -Path ($env:TEMP + '\RebootCount.log') -ErrorAction SilentlyContinue -Force
-} else {
-	#Create the file containing number of times this script has rerun if it does not exist
-	If ((Test-Path ($env:TEMP + '\RebootCount.log')) -eq $false) {
-		New-Item -Path ($env:TEMP + '\RebootCount.log') -ItemType File -Value 0 -Force
-	}
-	#Reboot the machine and rerun the Dell Driver Updates
-	If (([int](Get-Content -Path ($env:TEMP + '\RebootCount.log'))) -lt 5) {
-		#Microsoft SCCM/MDT environmental variables
-		$TSEnv = New-Object -ComObject Microsoft.SMS.TSEnvironment
-		#Reboot the machine once this task is completed and restart the task sequence
-		$TSEnv.Value('SMSTSRebootRequested') = $true
-		#Rerun the same task
-		$TSEnv.Value('SMSTSRetryRequested') = $true
-		#increment the reboot counter
-		New-Item -Path ($env:TEMP + '\RebootCount.log') -ItemType File -Value ([int](Get-Content -Path ($env:TEMP + '\RebootCount.log')) + 1) -Force
-	#End the update process if run 5 or more times, delete all associated log files, and proceed to the next task
-	} else {
+	#Update the system with the latest drivers while also writing log files to the %windir%\temp directory
+	$ErrCode = (Start-Process -FilePath ((Get-ChildItem -Path $env:ProgramFiles, ${env:ProgramFiles(x86)} -Filter 'dcu-cli.exe' -Recurse).FullName) -ArgumentList ('/log ' + $env:windir + '\temp') -Wait).ExitCode
+	#Read the ActivityLog.xml file
+	$File = (Get-Content -Path ($env:windir + '\temp\ActivityLog.xml')).Trim()
+	#if no updates were found or updates were applied and no required reboot is necessary, then delete the log files
+	If (('<message>CLI: No application component updates found.</message>' -in $File) -and (('<message>CLI: No available updates can be installed.</message>' -in $File) -or ('<message>CLI: No updates are available.</message>' -in $File)))
+	{
 		Remove-Item -Path ($env:windir + '\temp\ActivityLog.xml') -ErrorAction SilentlyContinue -Force
 		Remove-Item -Path ($env:windir + '\temp\inventory.xml') -ErrorAction SilentlyContinue -Force
 		Remove-Item -Path ($env:TEMP + '\RebootCount.log') -ErrorAction SilentlyContinue -Force
 	}
+	else
+	{
+		#Create the file containing number of times this script has rerun if it does not exist
+		If ((Test-Path ($env:TEMP + '\RebootCount.log')) -eq $false)
+		{
+			New-Item -Path ($env:TEMP + '\RebootCount.log') -ItemType File -Value 0 -Force
+		}
+		#Reboot the machine and rerun the Dell Driver Updates
+		If (([int](Get-Content -Path ($env:TEMP + '\RebootCount.log'))) -lt 5)
+		{
+			#Microsoft SCCM/MDT environmental variables
+			$TSEnv = New-Object -ComObject Microsoft.SMS.TSEnvironment
+			#Reboot the machine once this task is completed and restart the task sequence
+			$TSEnv.Value('SMSTSRebootRequested') = $true
+			#Rerun the same task
+			$TSEnv.Value('SMSTSRetryRequested') = $true
+			#increment the reboot counter
+			New-Item -Path ($env:TEMP + '\RebootCount.log') -ItemType File -Value ([int](Get-Content -Path ($env:TEMP + '\RebootCount.log')) + 1) -Force
+			#End the update process if run 5 or more times, delete all associated log files, and proceed to the next task
+		}
+		else
+		{
+			Remove-Item -Path ($env:windir + '\temp\ActivityLog.xml') -ErrorAction SilentlyContinue -Force
+			Remove-Item -Path ($env:windir + '\temp\inventory.xml') -ErrorAction SilentlyContinue -Force
+			Remove-Item -Path ($env:TEMP + '\RebootCount.log') -ErrorAction SilentlyContinue -Force
+		}
+	}
 }
+else {
+	Write-Output 'Dell Command | Update is not installed'
+	Exit 1
+}