Admin user setup in Sharepoint power psake

adminuser-setup-psake.ps1

Properties {
  $site_owner = "domain\serviceaccount"
  $ca_port = 3456
}

Task AdminUser-Setup -Depends Solution-Setup -Description "Sets the current user as a farm admin on current computer" {
   Add-PsSnapin Microsoft.SharePoint.PowerShell -ErrorAction "SilentlyContinue"
   $whoami = [Security.Principal.WindowsIdentity]::GetCurrent().Name
   Write-Host "You are logged in as $whoami"
   
   if ($whoami -ne $site_owner) 
   { 
     throw "Error: you must be logged in as $site_owner - please restart this console using this account." 
   }
   $userToAdd =  Read-Host -Prompt 'User to add to Farm Admin group <DOMAIN>\<USERNAME>'

   $ca = "http://"+$env:COMPUTERNAME+":$ca_port"
   Write-Host "Adding $userToAdd as farm admin to $ca"
   $site = new-Object Microsoft.SharePoint.SPSite($ca) 
   $web = $site.RootWeb    
   $farmadmins = $web.SiteGroups["Farm Administrators"] 
   $farmadmins.AddUser($userToAdd,"",$userToAdd,"") 
   $web.Dispose() 
   $site.Dispose() 
}