Python: absolute basics

probably still need to route some values around

src/feature-flags.ts

@@ -47,6 +47,7 @@ export interface FeatureEnablement {
 export enum Feature {
   ArtifactV4Upgrade = "artifact_v4_upgrade",
   CleanupTrapCaches = "cleanup_trap_caches",
+  CodeqlActionPythonDefaultIsToNotExtractStdlib = "codeql_action_python_default_is_to_not_extract_stdlib",
   CppDependencyInstallation = "cpp_dependency_installation_enabled",
   DisableCsharpBuildless = "disable_csharp_buildless",
   DisableJavaBuildlessEnabled = "disable_java_buildless_enabled",
@@ -97,6 +98,12 @@ export const featureConfig: Record<
     envVar: "CODEQL_ACTION_CLEANUP_TRAP_CACHES",
     minimumVersion: undefined,
   },
+  [Feature.CodeqlActionPythonDefaultIsToNotExtractStdlib]: {
+    defaultValue: false,
+    envVar: "CODEQL_ACTION_DISABLE_PYTHON_STANDARD_LIBRARY_EXTRACTION",
+    minimumVersion: undefined,
+    toolsFeature: ToolsFeature.PythonDefaultIsToNotExtractStdlib,
+  },
   [Feature.CppDependencyInstallation]: {
     defaultValue: false,
     envVar: "CODEQL_EXTRACTOR_CPP_AUTOINSTALL_DEPENDENCIES",

src/init-action.ts

@@ -65,6 +65,7 @@ import {
   getErrorMessage,
 } from "./util";
 import { validateWorkflow } from "./workflow";
+import { isFeatureAvailable } from "@actions/cache";
 
 /** Fields of the init status report that can be sent before `config` is populated. */
 interface InitStatusReport extends StatusReportBase {
@@ -611,6 +612,15 @@ async function run() {
       );
     }
 
+    if (await codeql.supportsFeature(ToolsFeature.PythonDefaultIsToNotExtractStdlib)) {
+      // We are in the case where the default has switched to not extracting the stdlib.
+      if (!(await features.getValue(Feature.CodeqlActionPythonDefaultIsToNotExtractStdlib, codeql))) {
+        // We are in a situation where the feature flag is not rolled out,
+        // so we need to suppress the new default behavior.
+        core.exportVariable("CODEQL_EXTRACTOR_PYTHON_EXTRACT_STDLIB", "true");
+      }
+    }
+
     const sourceRoot = path.resolve(
       getRequiredEnvParam("GITHUB_WORKSPACE"),
       getOptionalInput("source-root") || "",

src/tools-features.ts

@@ -10,6 +10,7 @@ export enum ToolsFeature {
   TraceCommandUseBuildMode = "traceCommandUseBuildMode",
   SarifMergeRunsFromEqualCategory = "sarifMergeRunsFromEqualCategory",
   ForceOverwrite = "forceOverwrite",
+  PythonDefaultIsToNotExtractStdlib = "pythonDefaultIsToNotExtractStdlib",
 }
 
 /**