Install dsc v3 package if not found when processing dsc v3 configuration file

.github/actions/spelling/patterns.txt

@@ -35,6 +35,7 @@ GetRestAPIBaseUri\(".*"\) == L".*"
 # Sample store product id for App Installer
 9nblggh4nns1
 9NVTPZWRC6KQ
+9PCX3HX4HZ0Z
 
 # Automatically suggested patterns
 

azure-pipelines.yml

@@ -371,17 +371,8 @@ jobs:
     displayName: Clean up Sysinternals PsTools
     condition: succeededOrFailed()
 
-    # Install DSC v3 until the DSC v3 processor handles that on its own
-  - powershell: |
-      $installResult = Install-WinGetPackage -Id Microsoft.DSC.Preview -Source winget -InstallerType Msix -Version 3.1.1
-      $installResult | Format-List
-      if ($installResult.ExtendedErrorCode) { throw $installResult.ExtendedErrorCode }
-    displayName: Install DSC v3
-    condition: succeededOrFailed()
-
     # Install required DSC modules until export all command can handle auto acquisition
   - pwsh: |
-      Install-Module -Name Microsoft.WinGet.DSC -Force
       Install-Module -Name Microsoft.Windows.Developer -AllowPrerelease -Force
     displayName: Install Required DSC Modules for Tests
     condition: succeededOrFailed()

src/AppInstallerCLICore/Resources.h

@@ -98,6 +98,8 @@ namespace AppInstaller::CLI::Resource
         WINGET_DEFINE_RESOURCE_STRINGID(ConfigurationInDesiredState);
         WINGET_DEFINE_RESOURCE_STRINGID(ConfigurationInform);
         WINGET_DEFINE_RESOURCE_STRINGID(ConfigurationInitializing);
+        WINGET_DEFINE_RESOURCE_STRINGID(ConfigurationInstallDscPackage);
+        WINGET_DEFINE_RESOURCE_STRINGID(ConfigurationInstallDscPackageFailed);
         WINGET_DEFINE_RESOURCE_STRINGID(ConfigurationLocal);
         WINGET_DEFINE_RESOURCE_STRINGID(ConfigurationModuleNameOnly);
         WINGET_DEFINE_RESOURCE_STRINGID(ConfigurationModulePath);

src/AppInstallerCLICore/Workflows/ConfigurationFlow.cpp

@@ -5,6 +5,7 @@
 #include "ImportExportFlow.h"
 #include "PromptFlow.h"
 #include "TableOutput.h"
+#include "MSStoreInstallerHandler.h"
 #include "Public/ConfigurationSetProcessorFactoryRemoting.h"
 #include "ConfigurationCommon.h"
 #include "ConfigurationWingetDscModuleUnitValidation.h"
@@ -187,6 +188,41 @@ namespace AppInstaller::CLI::Workflow
                 {
                     factoryMap.Insert(ConfigurationRemoting::ToHString(ConfigurationRemoting::PropertyName::DscExecutablePath), Utility::ConvertToUTF16(context.Args.GetArg(Args::Type::ConfigurationProcessorPath)));
                 }
+                else
+                {
+                    // Make sure DSC executable path can be found. Otherwise, we'll install the DSC v3 package.
+                    winrt::hstring foundExecutablePath = factoryMap.Lookup(ConfigurationRemoting::ToHString(ConfigurationRemoting::PropertyName::FoundDscExecutablePath));
+                    if (foundExecutablePath.empty())
+                    {
+                        AICLI_LOG(Config, Info, << "dsc.exe not found and not provided. Installing dsc package from store.");
+                        context.Reporter.Info() << Resource::String::ConfigurationInstallDscPackage;
+
+                        auto installDscContextPtr = context.CreateSubContext();
+                        Execution::Context& installDscContext = *installDscContextPtr;
+                        auto previousThreadGlobals = installDscContext.SetForCurrentThread();
+
+                        Manifest::ManifestInstaller dscInstaller;
+// TEMP: Until DSCv3 support is not experimental, allow the preview build to be installed automatically.
+// #ifndef AICLI_DISABLE_TEST_HOOKS
+                        dscInstaller.ProductId = "9PCX3HX4HZ0Z";
+// #else
+//                      dscInstaller.ProductId = "9NVTPZWRC6KQ";
+// #endif
+                        installDscContext.Add<Execution::Data::Installer>(std::move(dscInstaller));
+                        installDscContext.Args.AddArg(Execution::Args::Type::InstallScope, Manifest::ScopeToString(Manifest::ScopeEnum::User));
+                        installDscContext.Args.AddArg(Execution::Args::Type::Silent);
+                        installDscContext.Args.AddArg(Execution::Args::Type::Force);
+
+                        installDscContext << MSStoreInstall;
+
+                        if (installDscContext.IsTerminated())
+                        {
+                            AICLI_LOG(Config, Error, << "Failed to install dsc v3 package and could not find dsc.exe, it must be provided by the user.");
+                            context.Reporter.Error() << Resource::String::ConfigurationInstallDscPackageFailed;
+                            THROW_WIN32(ERROR_FILE_NOT_FOUND);
+                        }
+                    }
+                }
 
                 if (Logging::Log().IsEnabled(Logging::Channel::Config, Logging::Level::Verbose))
                 {

src/AppInstallerCLIPackage/Shared/Strings/en-us/winget.resw

@@ -3348,4 +3348,11 @@ Please specify one of them using the --source option to proceed.</value>
   <data name="OutputDirectoryArgumentDescription" xml:space="preserve">
     <value>Directory where the results are to be written</value>
   </data>
-</root>
+  <data name="ConfigurationInstallDscPackage" xml:space="preserve">
+    <value>Desired State Configuration package not found on the system. Installing the package...</value>
+  </data>
+  <data name="ConfigurationInstallDscPackageFailed" xml:space="preserve">
+    <value>Failed to install Desired State Configuration package. Install the package manually or provide the path to dsc.exe through --processor-path argument.</value>
+    <comment>{Locked="dsc.exe","--processor-path"}</comment>
+  </data>
+</root>