fix(core): infer codex environment and use default tasks runner (#31359)

e2e/release/src/version-plans.test.ts

@@ -1,4 +1,4 @@
-import { NxJsonConfiguration } from '@nx/devkit';
+import { NxJsonConfiguration, readJsonFile, workspaceRoot } from '@nx/devkit';
 import {
   cleanupProject,
   exists,
@@ -459,7 +459,11 @@ Update the independent packages with a patch, preminor, and prerelease.
     expect(exists(join(versionPlansDir, 'bump-fixed.md'))).toBe(true);
     expect(exists(join(versionPlansDir, 'bump-independent.md'))).toBe(true);
 
-    packageInstall('yargs', null, 'latest', 'dev');
+    // Reference the same version of yargs as nx uses to avoid compatibility issues
+    const nxPackageJson = readJsonFile(
+      join(workspaceRoot, 'packages/nx/package.json')
+    );
+    packageInstall('yargs', null, nxPackageJson.dependencies.yargs, 'dev');
 
     await writeFile(
       tmpProjPath('release.js'),

packages/nx/src/tasks-runner/run-command.ts

@@ -1154,6 +1154,18 @@ function getTasksRunnerPath(
   runner: string,
   nxJson: NxJsonConfiguration<string[] | '*'>
 ) {
+  // If running inside of Codex, there will be no internet access, so we cannot use the cloud runner, regardless of other config.
+  // We can infer this scenario by checking for certain environment variables defined in their base image: https://github.com/openai/codex-universal
+  if (process.env.CODEX_ENV_NODE_VERSION) {
+    output.warn({
+      title: 'Codex environment detected, using default tasks runner',
+      bodyLines: [
+        'Codex does not have internet access when it runs tasks, so Nx will use the default tasks runner and only leverage local caching.',
+      ],
+    });
+    return defaultTasksRunnerPath;
+  }
+
   const isCloudRunner =
     // No tasksRunnerOptions for given --runner
     nxJson.nxCloudAccessToken ||