Fix dnx not authenticating for private feeds

src/Cli/dotnet/Commands/Tool/Execute/ToolExecuteCommand.cs

@@ -1,4 +1,4 @@
-// Licensed to the .NET Foundation under one or more agreements.
+// Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
 using System.CommandLine;
@@ -128,13 +128,14 @@ public override int Execute()
             }
 
             //  We've already determined which source we will use and displayed that in a confirmation message to the user.
-            //  So set the package location here to override the source feeds to just the source we already resolved to.
+            //  So set the package location here to override the source feeds to the explicit source we already resolved to.
             //  This does mean that we won't work with feeds that have a primary package but where the RID-specific packages are on
             //  other feeds, but this is probably OK.
             var downloadPackageLocation = new PackageLocation(
                 nugetConfig: _configFile != null ? new(_configFile) : null,
-                sourceFeedOverrides: [packageSource.Source],
-                additionalFeeds: _addSource);
+                sourceFeedOverrides: _sources,
+                additionalFeeds: _addSource,
+                explicitSource: packageSource);
 
             toolPackage = _toolPackageDownloader.InstallPackage(
                 downloadPackageLocation,

src/Cli/dotnet/NugetPackageDownloader/NuGetPackageDownloader.cs

@@ -443,6 +443,11 @@ private List<PackageSource> LoadDefaultSources(PackageId packageId, PackageSourc
 
     public IEnumerable<PackageSource> LoadNuGetSources(PackageId packageId, PackageSourceLocation packageSourceLocation = null, PackageSourceMapping packageSourceMapping = null)
     {
+        if (packageSourceLocation?.ExplicitSource != null)
+        {
+            return [packageSourceLocation.ExplicitSource];
+        }
+
         var sources = (packageSourceLocation?.SourceFeedOverrides.Any() ?? false) ?
             LoadOverrideSources(packageSourceLocation) :
             LoadDefaultSources(packageId, packageSourceLocation, packageSourceMapping);

src/Cli/dotnet/NugetPackageDownloader/PackageSourceLocation.cs

@@ -1,9 +1,10 @@
-// Licensed to the .NET Foundation under one or more agreements.
+// Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
 #nullable disable
 
 using Microsoft.Extensions.EnvironmentAbstractions;
+using NuGet.Configuration;
 
 namespace Microsoft.DotNet.Cli.NuGetPackageDownloader;
 
@@ -14,7 +15,8 @@ public PackageSourceLocation(
         DirectoryPath? rootConfigDirectory = null,
         string[] sourceFeedOverrides = null,
         string[] additionalSourceFeeds = null,
-        string basePath = null)
+        string basePath = null,
+        PackageSource explicitSource = null)
     {
         basePath = basePath ?? Directory.GetCurrentDirectory();
 
@@ -24,12 +26,14 @@ public PackageSourceLocation(
         SourceFeedOverrides = ExpandLocalFeed(sourceFeedOverrides, basePath);
         // Feeds to be using in addition to config
         AdditionalSourceFeed = ExpandLocalFeed(additionalSourceFeeds, basePath);
+        ExplicitSource = explicitSource;
     }
 
     public FilePath? NugetConfig { get; }
     public DirectoryPath? RootConfigDirectory { get; }
     public string[] SourceFeedOverrides { get; private set; }
     public string[] AdditionalSourceFeed { get; private set; }
+    public PackageSource ExplicitSource { get; private set; }
 
     private static string[] ExpandLocalFeed(string[] sourceFeedOverrides, string basePath)
     {

src/Cli/dotnet/ToolPackage/PackageLocation.cs

@@ -1,20 +1,23 @@
-// Licensed to the .NET Foundation under one or more agreements.
+// Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
 #nullable disable
 
 using Microsoft.Extensions.EnvironmentAbstractions;
+using NuGet.Configuration;
 
 namespace Microsoft.DotNet.Cli.ToolPackage;
 
 internal class PackageLocation(
     FilePath? nugetConfig = null,
     DirectoryPath? rootConfigDirectory = null,
     string[] additionalFeeds = null,
-    string[] sourceFeedOverrides = null)
+    string[] sourceFeedOverrides = null,
+    PackageSource explicitSource = null)
 {
     public FilePath? NugetConfig { get; } = nugetConfig;
     public DirectoryPath? RootConfigDirectory { get; } = rootConfigDirectory;
     public string[] AdditionalFeeds { get; } = additionalFeeds ?? [];
     public string[] SourceFeedOverrides { get; } = sourceFeedOverrides ?? [];
+    public PackageSource ExplicitSource { get; } = explicitSource;
 }

src/Cli/dotnet/ToolPackage/ToolPackageDownloaderBase.cs

@@ -110,7 +110,7 @@ public IToolPackage InstallPackage(PackageLocation packageLocation, PackageId pa
             verbosity,
             restoreActionConfig);
 
-        var packageSourceLocation = new PackageSourceLocation(packageLocation.NugetConfig, packageLocation.RootConfigDirectory, packageLocation.SourceFeedOverrides, packageLocation.AdditionalFeeds, _currentWorkingDirectory);
+        var packageSourceLocation = new PackageSourceLocation(packageLocation.NugetConfig, packageLocation.RootConfigDirectory, packageLocation.SourceFeedOverrides, packageLocation.AdditionalFeeds, _currentWorkingDirectory, packageLocation.ExplicitSource);
 
         NuGetVersion packageVersion = nugetPackageDownloader.GetBestPackageVersionAsync(packageId, versionRange, packageSourceLocation).GetAwaiter().GetResult();