add logging to determine failure

Author: ramsessanchez

tools/GenerateModules.ps1

@@ -51,6 +51,24 @@ Set-Location (Join-Path $ScriptRoot "../autorest.powershell")
 rush install
 rush build
 
+# Diagnostic: show autorest cache state and npm registry config before generation.
+Write-Host "--- Autorest/npm diagnostics ---"
+$autorestHome = if ($env:AUTOREST_HOME) { $env:AUTOREST_HOME } else { Join-Path $env:USERPROFILE ".autorest" }
+Write-Host "AUTOREST_HOME: $autorestHome"
+$coreCacheDir = Join-Path $autorestHome "@autorest\core"
+if (Test-Path $coreCacheDir) {
+    Write-Host "Autorest core cache versions: $(Get-ChildItem $coreCacheDir -Directory | Select-Object -ExpandProperty Name)"
+    $nodeModulesDir = Join-Path $coreCacheDir "3.10.4\node_modules\@autorest\core"
+    Write-Host "Cache 3.10.4 node_modules present: $(Test-Path $nodeModulesDir)"
+} else {
+    Write-Host "WARNING: Autorest core cache directory not found at $coreCacheDir"
+}
+Write-Host "npm registry: $(npm config get registry 2>&1)"
+Write-Host "NPM_CONFIG_USERCONFIG: $env:NPM_CONFIG_USERCONFIG"
+$userNpmrc = Join-Path $env:USERPROFILE ".npmrc"
+Write-Host "~/.npmrc exists: $(Test-Path $userNpmrc)"
+Write-Host "--- End diagnostics ---"
+
 $RequiredGraphModules = @()
 $AuthModuleManifest = Join-Path $ModulesSrc "Authentication" "Authentication" "artifacts" "Microsoft.Graph.Authentication.psd1"
 $LoadedAuthModule = Import-Module $AuthModuleManifest -PassThru -ErrorAction SilentlyContinue

tools/GenerateServiceModule.ps1

@@ -69,10 +69,15 @@ $ApiVersion | ForEach-Object {
             else {
                 $FullModuleVersion = $ModuleMetadata.versions[$CurrentApiVersion].version
             }
-            npx autorest --max-memory-size=$MaxMemorySize --module-version:$FullModuleVersion --module-name:$ModuleFullName --service-name:$Module --input-file:$OpenApiFile $AutoRestModuleConfig --max-cpu=2 --network-calls=2
-            if ($LastExitCode -ne 0) {
-                Write-Host -ForegroundColor Red "AutoREST failed to generate '$ModuleFullName' module."
-                return $LastExitCode
+            $autorestLog = [System.IO.Path]::Combine([System.IO.Path]::GetTempPath(), "autorest-$($ModuleFullName -replace '[^a-zA-Z0-9-]', '-').log")
+            npx autorest --verbose --max-memory-size=$MaxMemorySize --module-version:$FullModuleVersion --module-name:$ModuleFullName --service-name:$Module --input-file:$OpenApiFile $AutoRestModuleConfig --max-cpu=2 --network-calls=2 2>&1 | Out-File -FilePath $autorestLog -Encoding utf8
+            $autorestExitCode = $LASTEXITCODE
+            if ($autorestExitCode -ne 0) {
+                Write-Host -ForegroundColor Red "AutoREST failed (exit $autorestExitCode) generating '$ModuleFullName'."
+                Write-Host -ForegroundColor Yellow "=== AutoREST log: $autorestLog ==="
+                if (Test-Path $autorestLog) { Get-Content $autorestLog | ForEach-Object { Write-Host $_ } }
+                Write-Host -ForegroundColor Yellow "=== End AutoREST log ==="
+                return $autorestExitCode
             }
             Write-Debug "AutoRest generated '$ModuleFullName' successfully."