Getting, install, or update DSC Resources I want to have. It could be used to install every Module from the Gallery. However, this is something I do with DSC afterwards!

invoke-GetDSCResources.ps1

#requires -Modules PowerShellGet
#requires -Version 2.0
#Requires -RunAsAdministrator

<#
		.SYNOPSIS
		Install some DSC Resources
	
		.DESCRIPTION
		Getting, install, or update DSC Resources I want to have. 
		It could be used to install every Module from the Gallery. 
		However, this is something I do with DSC afterwards!
	
		.EXAMPLE
		PS C:\> .\invoke-GetDSCResources.ps1

		.EXAMPLE
		PS C:\> .\invoke-GetDSCResources.ps1 -verbose
		VERBOSE: Populating RepositorySourceLocation property for module PSDscResources.
		VERBOSE: Try to update PSDscResources
		VERBOSE: Updated PSDscResources
	
		.NOTES
		Small script I created for myself.
		I have to prepare DSC systems from time to time, and I want to have the same set of DSC resources on all of them.
		Mainly because I'm lazy, but I'm an old-school Unix guy: Never type something more than two times: AUTOMATE.

		I install the resources system wide!
		That is why we have the Elevated Shell requirement (#Requires -RunAsAdministrator).
		If you want to use it just for the current user, change the Scope in $paramInstallModule from 'AllUsers' to 'CurrentUser'.

		TODO: Pester Test is missing
		DONE: Make it more robust

		Disclaimer: The code is provided 'as is,' with all possible faults, defects or errors, and without warranty of any kind.

		Author: Joerg Hochwald

		License: http://unlicense.org

		.LINK
		Author http://jhochwald.com

		.Link
		License http://unlicense.org
#>
[CmdletBinding()]
param ()

BEGIN
{
	# Define some defaults
	$STP = 'Stop'
	$SC = 'SilentlyContinue'

	# Suppressing the PowerShell Progress Bar
	$script:ProgressPreference = $SC

	# Create a list of the DSC Resources I want
	$NewDSCModules = @(
		'PSDscResources', 
		'xNetworking', 
		'xPSDesiredStateConfiguration', 
		'xWebAdministration', 
		'xCertificate', 
		'xComputerManagement', 
		'xActiveDirectory', 
		'SystemLocaleDsc', 
		'xRemoteDesktopAdmin', 
		'xPendingReboot', 
		'xSmbShare', 
		'xWindowsUpdate', 
		'xDscDiagnostics', 
		'xCredSSP', 
		'xDnsServer', 
		'xWinEventLog', 
		'xDhcpServer', 
		'xHyper-V', 
		'xStorage', 
		'xWebDeploy'
		'xRemoteDesktopSessionHost', 
		'xDismFeature', 
		'xSystemSecurity', 
		'WebAdministrationDsc', 
		'OfficeOnlineServerDsc', 
		'AuditPolicyDsc', 
		'xDFS', 
		'SecurityPolicyDsc', 
		'xReleaseManagement', 
		'xExchange', 
		'xDefender', 
		'xWindowsEventForwarding', 
		'cHyper-V'
	)
}

PROCESS
{
	foreach ($NewDSCModule in $NewDSCModules)
	{
		# Cleanup
		$ModuleIsAvailable = $null

		# Check: Do I have the resource?
		$paramGetModule = @{
			ListAvailable = $true
			Name          = $NewDSCModule
			ErrorAction   = $SC
			WarningAction = $SC
		}
		$ModuleIsAvailable = (Get-Module @paramGetModule)
		
		if (-not ($ModuleIsAvailable))
		{
			# Nope: Install the resource
			try
			{
				Write-Verbose -Message "Try to install $NewDSCModule"

				$paramInstallModule = @{
					Name          = $NewDSCModule
					Scope         = AllUsers
					Force         = $true
					ErrorAction   = $STP
					WarningAction = $SC
				}
				$null = (Install-Module @paramInstallModule)

				Write-Verbose -Message "Installed $NewDSCModule"
			}
			catch
			{
				# Whoopsie
				$paramWriteWarning = @{
					Message     = "Sorry, unable to install $NewDSCModule"
					ErrorAction = $SC
				}
				Write-Warning @paramWriteWarning
			}
		}
		else
		{
			try
			{
				Write-Verbose -Message "Try to update $NewDSCModule"

				# TODO: Implement the check from invoke-ModuleUpdates.ps1 to prevent the unneeded update tries.
				$paramUpdateModule = @{
					Name          = $NewDSCModule
					Confirm       = $false
					ErrorAction   = $STP
					WarningAction = $SC
				}
				$null = (Update-Module @paramUpdateModule)

				Write-Verbose -Message "Updated $NewDSCModule"
			}
			catch
			{
				# Whoopsie
				$paramWriteWarning = @{
					Message     = "Sorry, unable to update $NewDSCModule"
					ErrorAction = $SC
				}
				Write-Warning @paramWriteWarning
			}
		}
	}
}

END {
	# No longer suppressing the PowerShell Progress Bar
	$script:ProgressPreference = 'Continue'
}