Use PowerShell to change the Env:Path in a mounted windows image-CodePudding

I've written a PowerShell script to create a custom Boot.wim file that contains some useful utilities and custom .ps1 scripts along with the PowerShell executable. This all works just as it should. What I can't figure is how to add to the environment path variable the directory for the utilities "x:\Users\Utilities" to the Mounted Image.

Here's a code snippet from the program that shows how I manipulate the mounted image to add the utilities, etc.

$WinADK="C:\Program Files (x86)\Windows Kits\10\"  
        "Assessment and Deployment Kit"  
        "\Windows Preinstallation Environment\"  
        "$(Get-ArchitectureString)"
    
$WinPETemp='G:\TempPE'

New-Item -ItemType Directory -Path "$($WinPETemp)\Media" -force
$CIArgs = @{path        = $(Join-Path $WinAdk -ChildPath "en-us\winpe.wim")
            Destination = "$($WinPETemp)\Media\boot.wim"}
Copy-Item @CIArgs
New-Item -ItemType Directory -Path $(Join-Path $WinPETemp -ChildPath "\Mount") –Force

#----- Mount the WinPE WIM file for Editing -----

$MTArgs = @{ImagePath = $(Join-Path $($WinPETemp) -ChildPath "\Media\boot.wim")
            Index     = 1 
            path      = $(Join-Path $($WinPETemp) -ChildPath "\Mount")
           }

Try { Mount-WindowsImage @MTArgs -ErrorAction Stop}
Catch { 
        Get-WindowsImage -mounted | 
          Dismount-Windowsimage -discard
        Mount-WindowsImage @MTArgs
}
#--- Packages List - PowerShell, Storage, and DISM cmdlets --#
$PkgList = @(
    "WinPE-WMI.cab", 
    "en-us\WinPE-WMI_en-us.cab", 
    "WinPE-NetFx.cab", 
    "en-us\WinPE-NetFx_en-us.cab", 
    "WinPE-Scripting.cab", 
    "en-us\WinPE-Scripting_en-us.cab", 
    "WinPE-PowerShell.cab", 
    "en-us\WinPE-PowerShell_en-us.cab", 
    "WinPE-DismCmdlets.cab", 
    "en-us\WinPE-DismCmdlets_en-us.cab", 
    "WinPE-EnhancedStorage.cab", 
    "en-us\WinPE-EnhancedStorage_en-us.cab", 
    "WinPE-StorageWMI.cab", 
    "en-us\WinPE-StorageWMI_en-us.cab") 

 ForEach ($Pkg in $PkgList) {
 $AWPArgs = @{PackagePath = "$($WinAdk)\Winpe_OCS\$($Pkg)"
              Path        = "$($WinPETemp)\Mount"
              IgnoreCheck = $true }

 Add-WindowsPackage @AWPArgs 

 } #End ForEach ($Pkg...

<#
  Add your modifications now...
  Such as Directory for User Scripts, 
  Registry Modifications, specifically Powershell 
  Execution Policy
#>

#--- Add User Directories ---
$UserDirectories = @("Utilities","Scripts")

ForEach ($Dir in $UserDirectories) {
  $NIArgs = @{ItemType = 'Directory' 
              Path     = "$($WinPETemp)\Mount\Users\$($Dir)"}
  New-Item @NIArgs
}

#--- Add PowerShell Profile ---
$CIArgs = @{Path        = 
 "G:\WinPE Include Files\Microsoft.PowerShell_profile.ps1"
            Destination = 
 "$($WinPETemp)\Mount\Windows\System32\WindowsPowerShell\V1.0"}

 Copy-Item @CIArgs

#--- Add User Scripts to Directory ---

$Scripts = @("Get-DotNetVersionsInstalled.ps1")

ForEach ($FN in $Scripts) {
  $CIArgs = @{Path        = "G:\BEKDocs\Scripts\Production\$FN" 
              Destination = "$($WinPETemp)\Mount\Users\Scripts"}
  Copy-Item @CIArgs
}

#--- Add Portable Pgms to the Utilities Directory     ---
#--- Note: Must be 64 bit Programs no support for WOW ---

$Utilities = @("Speccy64\Speccy64.exe",
               "HWiNFO64\HWiNFO64.exe",
               "NirSoftx64\*.*")

ForEach ($FN in $Utilities) {
  $CIArgs = @{Path        = "G:\BEKDocs\NonInstPrograms\$FN" 
              Destination = "$($WinPETemp)\Mount\Users\Utilities"
              Recurse     = $True
             }

  If (Test-Path -Path "$(($CIArgs).Path)" ) {
    Copy-Item @CIArgs
  }
  Else {
         "Error:"   $CIArgs.Path   " Does NOT Exist!"
  }

}

#--- Mount WinPE Registry to the Local Registry for mods ---
$RegLoc = "$($WinPETemp)\Mount\Windows\System32\config\software"
reg load "HKLM\WimPE" "$RegLoc"

#--- Modify PowerShell Execution Policy in WIM Registry ---
$RegPath = "HKLM:\WimPE\Microsoft\PowerShell\1\ShellIds"  
           "\Microsoft.PowerShell\"
$NIArgs = @{Path  = $RegPath 
            Name  = 'ExecutionPolicy' 
            Value = "RemoteSigned"
            PropertyType = 'String'
            Force = $True}

New-ItemProperty @NIArgs

reg unload "HKLM\WimPE"  #--- UnMount WinPE registry ---

#----- DisMount the Modified WinPE WIM File -----

Dismount-WindowsImage -path "$($WinPETemp)\Mount" -Save

#----- Make a Backup of the Modified WIM file -----

$Destination='G:\Pewim'
New-Item -Path $Destination -ItemType Directory –Force

$CIArgs = @{Path        = "$($WinPETemp)\Media\boot.wim" 
            Destination = "$($Destination)\"}
Copy-Item @CIArgs

CodePudding user response：

You can put that into the image's registry, at HKLM:\SYSTEM\<ControlSet>\Control\Session Manager\Environment.

"ControlSet" is usually 001 and 002. Don't use CurrentControlSet though as that is not available for offline images.

CodePudding user response：

This answer is just to show the code I wrote, for other seekers information, after Ralph's fine suggestion. All is working as desired!

#--- Reset to load HKLM\System to add item to Path ---
$RegLoc = "G:\TempPE\Mount\Windows\System32\config\System"
reg load "HKLM\WimPE" "$RegLoc"
 
$RegPath = "HKLM:\WimPE\ControlSet001\Control\"  
           "Session Manager\Environment"

$GIArgs = @{Path  = "$RegPath" 
            Name  = 'Path' 
           }
$CurPath = (Get-ItemProperty @GIArgs).Path

$Curpath = "$CurPath;X:\Users\Utilities"

$SIArgs = @{Path  = "$RegPath"
            Name  = "Path"
            Value = "$CurPath"}
Set-ItemProperty @SIArgs

reg unload "HKLM\WimPE"  #--- UnMount WinPE registry ---

The above code goes right after the [ reg unload "HKLM\WimPe" ] in the code displayed in the question.