Playing with workload provisioning

eng/build.ps1

@@ -723,7 +723,30 @@ try {
 
   if ($restore) {
     &(Ensure-DotNetSdk) tool restore
-    &(Ensure-DotNetSdk) workload install macos # TODO: Specify version
+
+    # TODO: Move this to Install-DotNetWorkload.ps1
+    # TODO: Implement the same thing in bash for build.sh
+    foreach ($workload in $GlobalJson.workloads.PSObject.Properties) {
+      $workloadName = $workload.Name
+      $shortWorkloadName = $workloadName.Substring($workloadName.LastIndexOf(".") + 1)
+
+      $rollbackJson = @{}
+      $rollbackJson[$workloadName] = $workload.Value.version
+
+      $rollbackFile = New-TemporaryFile
+      $rollbackJson | ConvertTo-Json | Set-Content -Path $rollbackFile
+
+      $sourcesArgs = @()
+      foreach ($source in $workload.Value.sources) {
+        $sourcesArgs += "--source"
+        $sourcesArgs += $source
+      }
+
+      # TODO: This requires elevated access, at least on Mac.
+      &(Ensure-DotNetSdk) workload install $shortWorkloadName --from-rollback-file $rollbackFile $sourcesArgs
+
+      Remove-Item $rollbackFile
+    }
   }
 
   try

global.json

@@ -14,5 +14,14 @@
   "msbuild-sdks": {
     "Microsoft.DotNet.Arcade.Sdk": "7.0.0-beta.22080.1",
     "Microsoft.DotNet.Helix.Sdk": "7.0.0-beta.22080.1"
+  },
+  "workloads": {
+    "microsoft.net.sdk.macos": {
+      "version": "12.1.301-preview.13.4",
+      "sources": [
+        "https://aka.ms/dotnet6/nuget/index.json",
+        "https://api.nuget.org/v3/index.json"
+      ]
+    }
   }
 }