Powershell script doesnt work when fog client executes it

Greg Plamondon · Jan 3, 2020, 3:37 PM

I have the lock/logins screen set so that users know not to logon while the setup process is running.

I am using this PowerShell script in a snapin to change the image back to the default, the snapin is set to reboot.

<#
.SYNOPSIS
	Change Lock Screen and Desktop Background in Windows 10 Pro.
.DESCRIPTION
	This script allows you to change logon screen and desktop background in Windows 10 Professional using GPO startup script.
.PARAMETER LockScreenSource (Optional)
	Path to the Lock Screen image to copy locally in computer.
    Example: "\\SERVER-FS01\LockScreen.jpg"
.PARAMETER BackgroundSource (Optional)
	Path to the Desktop Background image to copy locally in computer.
    Example: "\\SERVER-FS01\BackgroundScreen.jpg"
.PARAMETER LogPath (Optional)
    Path where save log file. If it's not specified no log is recorded.
.EXAMPLE
    Set Lock Screen and Desktop Wallpaper with logs:
    Set-Screen -LockScreenSource "\\SERVER-FS01\LockScreen.jpg" -BackgroundSource "\\SERVER-FS01\BackgroundScreen.jpg" -LogPath "\\SERVER-FS01\Logs"
.EXAMPLE
    Set Lock Screen and Desktop Wallpaper without logs:
    Set-Screen -LockScreenSource "\\SERVER-FS01\LockScreen.jpg" -BackgroundSource "\\SERVER-FS01\BackgroundScreen.jpg"
.EXAMPLE
    Set Lock Screen only:
    Set-Screen -LockScreenSource "\\SERVER-FS01\LockScreen.jpg" -LogPath "\\SERVER-FS01\Logs"
.EXAMPLE
	Set Desktop Wallpaper only:
    Set-Screen -BackgroundSource "\\SERVER-FS01\BackgroundScreen.jpg" -LogPath "\\SERVER-FS01\Logs"
.NOTES 
	Author: Juan Granados 
	Date:   September 2018
#>
Param(
		[Parameter(Mandatory=$false,Position=0)] 
		[ValidateNotNullOrEmpty()]
		[string]$LockScreenSource,
        [Parameter(Mandatory=$false,Position=1)] 
		[ValidateNotNullOrEmpty()]
		[string]$BackgroundSource,
        [Parameter(Mandatory=$false,Position=2)] 
		[ValidateNotNullOrEmpty()]
		[string]$LogPath
	)

#Requires -RunAsAdministrator

if (-not [string]::IsNullOrWhiteSpace($LogPath)) {
    Start-Transcript -Path "$($LogPath)\$($env:COMPUTERNAME).log" | Out-Null
}

$ErrorActionPreference = "Stop"

$RegKeyPath = "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\PersonalizationCSP"

$DesktopPath = "DesktopImagePath"
$DesktopStatus = "DesktopImageStatus"
$DesktopUrl = "DesktopImageUrl"
$LockScreenPath = "LockScreenImagePath"
$LockScreenStatus = "LockScreenImageStatus"
$LockScreenUrl = "LockScreenImageUrl"

$StatusValue = "1"
$DesktopImageValue = "C:\Windows\System32\Desktop.jpg"
$LockScreenImageValue = "C:\Windows\System32\LockScreen.jpg"

if (!$LockScreenSource -and !$BackgroundSource) 
{
    Write-Host "Either LockScreenSource or BackgroundSource must has a value."
}
else 
{
    if(!(Test-Path $RegKeyPath)) {
        Write-Host "Creating registry path $($RegKeyPath)."
        New-Item -Path $RegKeyPath -Force | Out-Null
    }
    if ($LockScreenSource) {
        Write-Host "Copy Lock Screen image from $($LockScreenSource) to $($LockScreenImageValue)."
        Copy-Item $LockScreenSource $LockScreenImageValue -Force
        Write-Host "Creating registry entries for Lock Screen"
        New-ItemProperty -Path $RegKeyPath -Name $LockScreenStatus -Value $StatusValue -PropertyType DWORD -Force | Out-Null
        New-ItemProperty -Path $RegKeyPath -Name $LockScreenPath -Value $LockScreenImageValue -PropertyType STRING -Force | Out-Null
        New-ItemProperty -Path $RegKeyPath -Name $LockScreenUrl -Value $LockScreenImageValue -PropertyType STRING -Force | Out-Null
    }
    if ($BackgroundSource) {
        Write-Host "Copy Desktop Background image from $($BackgroundSource) to $($DesktopImageValue)."
        Copy-Item $BackgroundSource $DesktopImageValue -Force
        Write-Host "Creating registry entries for Desktop Background"
        New-ItemProperty -Path $RegKeyPath -Name $DesktopStatus -Value $StatusValue -PropertyType DWORD -Force | Out-Null
        New-ItemProperty -Path $RegKeyPath -Name $DesktopPath -Value $DesktopImageValue -PropertyType STRING -Force | Out-Null
        New-ItemProperty -Path $RegKeyPath -Name $DesktopUrl -Value $DesktopImageValue -PropertyType STRING -Force | Out-Null
    }  
}

if (-not [string]::IsNullOrWhiteSpace($LogPath)){Stop-Transcript}

The problem I am seeing is that the following script works if I run it from a PowerShell window but not as a snapin.

snapin settings:

Logfile for script:

**********************
Windows PowerShell transcript start
Start time: 20200103154304
Username: MTSTRANS\SYSTEM
RunAs User: MTSTRANS\SYSTEM
Configuration Name: 
Machine: TV3270 (Microsoft Windows NT 10.0.18363.0)
Host Application: powershell.exe -ExecutionPolicy Bypass -NoProfile -File C:\Program Files (x86)\FOG\tmp\Set-Screen.ps1 -LockScreenSource C:\Windows\Web\Screen\img100.jpg -LogPath c:\TEMP
Process ID: 4196
PSVersion: 5.1.18362.145
PSEdition: Desktop
PSCompatibleVersions: 1.0, 2.0, 3.0, 4.0, 5.0, 5.1.18362.145
BuildVersion: 10.0.18362.145
CLRVersion: 4.0.30319.42000
WSManStackVersion: 3.0
PSRemotingProtocolVersion: 2.3
SerializationVersion: 1.1.0.1
**********************
Creating registry path HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\PersonalizationCSP.
Copy Lock Screen image from C:\Windows\Web\Screen\img100.jpg to C:\Windows\System32\LockScreen.jpg.
Creating registry entries for Lock Screen
**********************
Windows PowerShell transcript end
End time: 20200103154305
**********************

but the image never changes…

fog.log

------------------------------------------------------------------------------
---------------------------------SnapinClient---------------------------------
------------------------------------------------------------------------------
 1/3/2020 4:29 PM Client-Info Client Version: 0.11.16
 1/3/2020 4:29 PM Client-Info Client OS:      Windows
 1/3/2020 4:29 PM Client-Info Server Version: 1.5.7.56
 1/3/2020 4:29 PM Middleware::Response Success
 1/3/2020 4:29 PM SnapinClient Running snapin SET-LOGON-SCREEN
 1/3/2020 4:29 PM Middleware::Communication Download: http://192.168.10.238//fog/service/snapins.file.php?mac=00:23:24:B3:BB:07|44:85:00:9A:20:2D|46:85:00:9A:20:2C|44:85:00:9A:20:2C|44:85:00:9A:20:30&taskid=10518
 1/3/2020 4:29 PM SnapinClient C:\Program Files (x86)\FOG\tmp\Set-Screen.ps1
 1/3/2020 4:29 PM Bus Emmiting message on channel: Notification
 1/3/2020 4:29 PM SnapinClient Starting snapin
 1/3/2020 4:29 PM SnapinClient Snapin finished
 1/3/2020 4:29 PM SnapinClient Return Code: 0
 1/3/2020 4:29 PM Bus Emmiting message on channel: Notification
 1/3/2020 4:29 PM Middleware::Communication URL: http://10fogserver/fog/service/snapins.checkin.php?taskid=10518&exitcode=0&mac=00:23:24:B3:BB:07|44:85:00:9A:20:2D|46:85:00:9A:20:2C|44:85:00:9A:20:2C|44:85:00:9A:20:30&newService&json
 1/3/2020 4:29 PM Power Creating shutdown request
 1/3/2020 4:29 PM Power Parameters: /r /c "Snapin requested restart" /t 0
 1/3/2020 4:29 PM Bus Emmiting message on channel: Power
 1/3/2020 4:29 PM Power Attempt 1/6 to shutdown computer
 1/3/2020 4:29 PM Power --> API call returned 1, will re-attempt in 5 minutes

Sebastian Roth · Jan 3, 2020, 9:18 PM

@Greg-Plamondon said in Powershell script doesnt work when fog client executes it:

The problem I am seeing is that the following script works if I run it from a PowerShell window but not as a snapin.

Do you see it being executed in the fog-client log? Just want to make sure!

Are you aware of the fact that fog-client runs as SYSTEM account. Maybe this causes your script to behave different to what you expect?

Not sure if this is playing a role in your case as well? https://forums.fogproject.org/topic/11671/powershell-snapin-and-registry

Greg Plamondon · Jan 3, 2020, 9:32 PM

@Sebastian-Roth said in Powershell script doesnt work when fog client executes it:

@Greg-Plamondon said in Powershell script doesnt work when fog client executes it:

The problem I am seeing is that the following script works if I run it from a PowerShell window but not as a snapin.

Do you see it being executed in the fog-client log? Just want to make sure!

Are you aware of the fact that fog-client runs as SYSTEM account. Maybe this causes your script to behave different to what you expect?

Not sure if this is playing a role in your case as well? https://forums.fogproject.org/topic/11671/powershell-snapin-and-registry

Sorry just updated my original post with the log.

Sebastian Roth · Jan 4, 2020, 8:00 AM

@Greg-Plamondon Ok, fog-client log looks fine. What about the other things I mentioned?

Powershell script doesnt work when fog client executes it

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