Made Install-Dependencies much faster by only installing missing requirements

build/Install-Dependencies.ps1

@@ -2,26 +2,76 @@
 #  Copyright (c) Microsoft Corporation.  All Rights Reserved.  Licensed under the MIT License.  See License in the project root for license information.
 # ------------------------------------------------------------------------------
 
-[cmdletbinding()]
+[CmdletBinding()]
 param(
-	[ArgumentCompleter({ (Get-ChildItem -Path "$PSScriptRoot\..\module").Name })]
-	[string]
-	$ModuleName = 'Entra',
+    # The name of the module to install dependencies for. The module name should match the folder name in the module folder. If not provided, the script will default to 'Entra'.
+    [ArgumentCompleter({ (Get-ChildItem -Path "$PSScriptRoot\..\module").Name })]
+    [string]
+    $ModuleName = 'Entra',
 
-	[ValidateScript({ Test-Path $_ })]
-	[string]
-    $ModuleSettingsPath
+    # Path to the ModuleSettings.json file. If not provided, the script will look for the file in the module folder.
+    [ValidateScript({ Test-Path $_ })]
+    [string]
+    $ModuleSettingsPath,
+
+    # Force installation of the required modules, even if they are already installed.
+    [switch]
+    $Force
 )
 
-. "$psscriptroot/common-functions.ps1"
+# Get module settings from the relevant ModuleSettings.json file or a file that is manually specified.
+if ($ModuleSettingsPath) {
+    $SettingsPath = $ModuleSettingsPath
+} else {
+    $SettingsPath = "$PSScriptRoot/../module/$ModuleName/config/ModuleSettings.json"
+}
+
+Write-Host "Getting module settings from: '$SettingsPath'" -ForegroundColor Cyan
+$ModuleSettings = Get-Content -Path $SettingsPath | ConvertFrom-Json
+$SourceModule = $ModuleSettings.sourceModule
+$DependencyRequiredVersion = $ModuleSettings.destinationModuleVersion
+
+# Get the names of the source and destination modules from the ModuleSettings.json file.
+[string[]]$ModuleNames = (($ModuleSettings.destinationModuleName) + $SourceModule).Split()
+
+Write-Host 'Checking for installed source and dependency modules...' -ForegroundColor Cyan
+$InstalledModules = foreach ( $Module in $ModuleNames ) {
+    Get-Module -Name $Module -ListAvailable -Verbose:$false | Sort-Object Name
+}
 
-$settingPath = "$PSScriptRoot/../module/$ModuleName/config/ModuleSettings.json"
-if ($ModuleSettingsPath) { $settingPath = $ModuleSettingsPath }
-$content = Get-Content -Path $settingPath | ConvertFrom-Json
-Write-Verbose("Installing Module $($content.sourceModule)")
-Install-Module $content.sourceModule -scope currentuser -Force -AllowClobber
+# Check if the source module is installed and then install it or update it.
+$IsSourceInstalled = $InstalledModules.Name -contains $SourceModule
+if (
+    (-not $IsSourceInstalled) -or
+    ($IsSourceInstalled -and $Force.IsPresent)
+) {
+    Write-Host "Installing Module: '$SourceModule'" -ForegroundColor Green
+    try {
+        Install-Module $SourceModule -Scope CurrentUser -Force -AllowClobber
+    } catch {
+        Write-Error "Failed to install the '$SourceModule' module. Error: $_"
+    }
+}
 
-foreach ($moduleName in $content.destinationModuleName){
-    Write-Verbose("Installing Module $($moduleName)")
-    Install-Module $moduleName -scope currentuser -RequiredVersion $content.destinationModuleVersion -Force -AllowClobber
-}
+# Install or update the destination modules specified in the ModuleSettings.json file.
+foreach ($DestinationModuleName in $ModuleSettings.destinationModuleName) {
+    $IsDependencyInstalled = $InstalledModules.Name -contains $DestinationModuleName
+    if (
+        # Force installation if the module is not installed or if the Force switch is present.
+        (-not $IsDependencyInstalled) -or ($IsDependencyInstalled -and $Force.IsPresent)
+    ) {
+        Write-Host "Installing Module: '$DestinationModuleName'" -ForegroundColor Green
+        try {
+            Install-Module $DestinationModuleName -RequiredVersion $DependencyRequiredVersion -Scope CurrentUser -Force -AllowClobber
+        } catch {
+            Write-Error "Failed to install the '$DestinationModuleName' module. Error: $_"
+        }
+    } else {
+        Write-Host "Updating Module: '$DestinationModuleName'" -ForegroundColor Green
+        try {
+            Update-Module -Name $DestinationModuleName -RequiredVersion $DependencyRequiredVersion -ErrorAction SilentlyContinue
+        } catch {
+            Write-Warning "Failed to update module '$DestinationModuleName' to version ${RequiredVersion}. Error: $_"
+        }
+    }
+}