Install-DscPullServerPSRepository.ps1

[CmdletBinding()]
param ()
    function Install-DscPullServerPrerequisites {
    [CmdletBinding()]
    param ()
    # If NuGet isn’t installed, install it.
    $localProvider = Get-PackageProvider -Name NuGet -ListAvailable -ErrorAction SilentlyContinue
    $provider = Find-PackageProvider -Name NuGet
    
    if ($localProvider -eq $null) {
        Write-Host "Installing NuGet Provider."
        $provider | Install-PackageProvider -Force 
    } else {
        Write-Host "NuGet Provider already installed."
    }
    
    $modules = @('PowerShellGet', 'PsDscResources', 'xPSDesiredStateConfiguration')

    $modules |% {
        $moduleName = $_
        $module = Find-Module -Name $moduleName
        $installed = Get-InstalledModule -Name $moduleName -ErrorAction SilentlyContinue

        if ($installed -eq $null) {
            Write-Host "Installing $moduleName"
            $module | Install-Module -Force
        } elseif ($installed[0].Version -lt $module.Version) { 
            Write-Host "Updating $moduleName"
            $module | Update-Module -Force 
        }

        Write-Host "Importing Module '$moduleName'"
        Import-Module -Name $moduleName -RequiredVersion $module.Version
    }
}

Install-DscPullServerPrerequisites