C#: Propagate explicit feeds to RestoreProjects

Author: mbg

Diff for: csharp/extractor/Semmle.Extraction.CSharp.DependencyFetching/NugetPackageRestorer.cs

@@ -156,7 +156,7 @@ public HashSet<AssemblyLookupLocation> Restore()
 
             var restoredProjects = RestoreSolutions(out var container);
             var projects = fileProvider.Projects.Except(restoredProjects);
-            RestoreProjects(projects, out var containers);
+            RestoreProjects(projects, explicitFeeds, out var containers);
 
             var dependencies = containers.Flatten(container);
 
@@ -260,8 +260,12 @@ private IEnumerable<string> RestoreSolutions(out DependencyContainer dependencie
         /// Populates dependencies with the relative paths to the assets files generated by the restore.
         /// </summary>
         /// <param name="projects">A list of paths to project files.</param>
-        private void RestoreProjects(IEnumerable<string> projects, out ConcurrentBag<DependencyContainer> dependencies)
+        private void RestoreProjects(IEnumerable<string> projects, HashSet<string>? configuredSources, out ConcurrentBag<DependencyContainer> dependencies)
         {
+            var sources = configuredSources ?? new();
+            sources.Add(PublicNugetOrgFeed);
+            this.dependabotProxy?.RegistryURLs.ForEach(url => sources.Add(url));
+
             var successCount = 0;
             var nugetSourceFailures = 0;
             ConcurrentBag<DependencyContainer> collectedDependencies = [];
@@ -276,7 +280,7 @@ private void RestoreProjects(IEnumerable<string> projects, out ConcurrentBag<Dep
                 foreach (var project in projectGroup)
                 {
                     logger.LogInfo($"Restoring project {project}...");
-                    var res = dotnet.Restore(new(project, PackageDirectory.DirInfo.FullName, ForceDotnetRefAssemblyFetching: true, TargetWindows: isWindows));
+                    var res = dotnet.Restore(new(project, PackageDirectory.DirInfo.FullName, ForceDotnetRefAssemblyFetching: true, sources.ToList(), TargetWindows: isWindows));
                     assets.AddDependenciesRange(res.AssetsFilePaths);
                     lock (sync)
                     {