Trim down the main smoke-testNuGet.Config to generate the tarball version (#2159)

Instead of maintaining the duplicate, just generate it based on the main
one.

Fixes: #1669

Author: omajid

eng/SourceBuild.Tarball.targets

@@ -1,11 +1,15 @@
 <Project>
 
+  <UsingTask AssemblyFile="$(XPlatSourceBuildTasksAssembly)" TaskName="AddSourceToNuGetConfig" />
+  <UsingTask AssemblyFile="$(XPlatSourceBuildTasksAssembly)" TaskName="RemoveInternetSourcesFromNuGetConfig" />
+
   <Target Name="PackSourceBuildTarball"
           Condition="'$(PackSourceBuildTarball)' == 'true'"
           DependsOnTargets="
             GetTarballDirProps;
             AddTarballSource;
             AddTarballSourcelinkMetadata;
+            GenerateTarballSmokeTestNuGetConfig;
             AddTarballTools;
             AddTarballPackages;
             AddTarballExternalTarballs;
@@ -106,6 +110,23 @@
       DestinationFiles="@(ArtifactsGitDir -> '$(TarballSourceDir)%(RecursiveDir)%(Filename)%(Extension)')" />
   </Target>
 
+  <Target Name="GenerateTarballSmokeTestNuGetConfig">
+
+    <Copy
+      SourceFiles="$(ProjectDir)smoke-testNuGet.Config"
+      DestinationFiles="$(ProjectDir)artifacts\tarball-smoke-testNuGet.Config" />
+
+    <RemoveInternetSourcesFromNuGetConfig
+      NuGetConfigFile="$(ProjectDir)artifacts\tarball-smoke-testNuGet.Config"
+      OfflineBuild="false"
+      RemoveFeedPrefixes="darc-pub-dotnet-" />
+
+    <AddSourceToNuGetConfig NuGetConfigFile="$(ProjectDir)artifacts\tarball-smoke-testNuGet.Config"
+                            SourceName="smoke-test feed"
+                            SourcePath="SMOKE_TEST_PACKAGE_FEED" />
+
+  </Target>
+
   <Target Name="AddTarballTools">
     <ItemGroup>
       <TarballRootToolFile
@@ -166,13 +187,13 @@
         in it to generate a full set of smoke-test-prereqs. This isn't necessary in the tarball
         because we have those smoke-test-prereqs, but we hit authentication errors nonetheless. Copy
         a trimmed down nuget.config in this case.
-        TODO: Automatically trim down the main nuget.config.
       -->
       <TarballCopyFile
-        Condition="Exists('$(ProjectDir)support\tarball\smoke-testNuGet.Config')"
-        Include="$(ProjectDir)support\tarball\smoke-testNuGet.Config"
+        Condition="Exists('$(ProjectDir)artifacts\tarball-smoke-testNuGet.Config')"
+        Include="$(ProjectDir)artifacts\tarball-smoke-testNuGet.Config"
         RelativeDestination="smoke-testNuGet.Config" />
 
+
       <!-- Setup package version props to include both source-built and running PackageVersions.props -->
       <TarballCopyFile
         Include="$(ProjectDir)support\tarball\PackageVersions.props"

support/tarball/smoke-testNuGet.Config

@@ -34,6 +34,13 @@ public class RemoveInternetSourcesFromNuGetConfig : Task
         /// </summary>
         public string[] KeepFeedPrefixes { get; set; }
 
+        /// <summary>
+        /// A list of prefix strings that make the task remove a package source unconditionally. For
+        /// example, a source named 'darc-pub-dotnet-aspnetcore-e81033e' will be removed if the prefix
+        /// 'darc-pub-dotnet-aspnetcore-' is in this list.
+        /// </summary>
+        public string[] RemoveFeedPrefixes { get; set; }
+
         public override bool Execute()
         {
             XDocument d = XDocument.Load(NuGetConfigFile);
@@ -52,6 +59,13 @@ public override bool Execute()
                         return true;
                     }
 
+                    if (RemoveFeedPrefixes
+                        ?.Any(prefix => feedName.StartsWith(prefix, StringComparison.OrdinalIgnoreCase))
+                        == true)
+                    {
+                        return false;
+                    }
+
                     string feedUrl = e.Attribute("value").Value;
                     if (OfflineBuild)
                     {