C#: Change nuget feed responsiveness checking to be opt-out

Author: tamasvajk

csharp/extractor/Semmle.Extraction.CSharp.DependencyFetching/NugetPackageRestorer.cs

@@ -94,7 +94,10 @@ public static DirectoryInfo[] GetOrderedPackageVersionSubDirectories(string pack
         public HashSet<AssemblyLookupLocation> Restore()
         {
             var assemblyLookupLocations = new HashSet<AssemblyLookupLocation>();
-            var checkNugetFeedResponsiveness = EnvironmentVariables.GetBoolean(EnvironmentVariableNames.CheckNugetFeedResponsiveness);
+            var checkNugetFeedResponsiveness = EnvironmentVariables.GetBooleanOptOut(EnvironmentVariableNames.CheckNugetFeedResponsiveness);
+            logger.LogInfo($"Checking NuGet feed responsiveness: {checkNugetFeedResponsiveness}");
+            compilationInfoContainer.CompilationInfos.Add(("NuGet feed responsiveness checked", checkNugetFeedResponsiveness ? "1" : "0"));
+
             try
             {
                 if (checkNugetFeedResponsiveness && !CheckFeeds())

csharp/extractor/Semmle.Extraction.CSharp.DependencyFetching/SourceGenerators/RazorGenerator.cs

@@ -20,17 +20,9 @@ public RazorGenerator(
 
         protected override bool IsEnabled()
         {
-            var webViewExtractionOption = Environment.GetEnvironmentVariable(EnvironmentVariableNames.WebViewGeneration);
-            if (webViewExtractionOption == null ||
-                bool.TryParse(webViewExtractionOption, out var shouldExtractWebViews) &&
-                shouldExtractWebViews)
-            {
-                compilationInfoContainer.CompilationInfos.Add(("WebView extraction enabled", "1"));
-                return true;
-            }
-
-            compilationInfoContainer.CompilationInfos.Add(("WebView extraction enabled", "0"));
-            return false;
+            var webViewExtractionOption = EnvironmentVariables.GetBooleanOptOut(EnvironmentVariableNames.WebViewGeneration);
+            compilationInfoContainer.CompilationInfos.Add(("WebView extraction enabled", webViewExtractionOption ? "1" : "0"));
+            return webViewExtractionOption;
         }
 
         protected override ICollection<string> AdditionalFiles => fileProvider.RazorViews;

csharp/extractor/Semmle.Util/EnvironmentVariables.cs

@@ -29,6 +29,19 @@ public static int GetDefaultNumberOfThreads()
             return threads;
         }
 
+        public static bool GetBooleanOptOut(string name)
+        {
+            var env = Environment.GetEnvironmentVariable(name);
+            if (env == null ||
+                bool.TryParse(env, out var value) &&
+                value)
+            {
+                return true;
+            }
+
+            return false;
+        }
+
         public static bool GetBoolean(string name)
         {
             var env = Environment.GetEnvironmentVariable(name);

csharp/ql/integration-tests/posix-only/standalone_dependencies_nuget_config_error_timeout/test.py

@@ -2,7 +2,7 @@
 from diagnostics_test_utils import *
 import os
 
-os.environ["CODEQL_EXTRACTOR_CSHARP_BUILDLESS_NUGET_FEEDS_CHECK"] = "true"          # Enable NuGet feed check
+# os.environ["CODEQL_EXTRACTOR_CSHARP_BUILDLESS_NUGET_FEEDS_CHECK"] = "true"        # Nuget feed check is enabled by default
 os.environ["CODEQL_EXTRACTOR_CSHARP_BUILDLESS_NUGET_FEEDS_CHECK_TIMEOUT"] = "1"     # 1ms, the GET request should fail with such short timeout
 os.environ["CODEQL_EXTRACTOR_CSHARP_BUILDLESS_NUGET_FEEDS_CHECK_LIMIT"] = "1"       # Limit the count of checks to 1
 os.environ["CODEQL_EXTRACTOR_CSHARP_BUILDLESS_NUGET_FEEDS_CHECK_EXCLUDED"] = "https://abc.de:8000/packages/"   # Exclude this feed from check