fix(gcp-metadata): ignore 42:01 MAC addresses on macOS

core/packages/gcp-metadata/src/gcp-residency.ts

@@ -85,9 +85,15 @@ export function isGoogleComputeEngineLinux(): boolean {
  * Determines if the process is running on a Google Compute Engine instance with a known
  * MAC address.
  *
+ * Always `false` on macOS: Compute Engine does not run macOS, and macOS assigns
+ * random, locally administered MAC addresses (which can begin with `42:01`) to
+ * interfaces such as `awdl0` and `llw0`.
+ *
  * @returns {boolean} `true` if the process is running on GCE (as determined by MAC address), `false` otherwise.
  */
 export function isGoogleComputeEngineMACAddress(): boolean {
+  if (platform() === 'darwin') return false;
+
   const interfaces = networkInterfaces();
 
   for (const item of Object.values(interfaces)) {

core/packages/gcp-metadata/test/gcp-residency.test.ts

@@ -101,6 +101,15 @@ describe('gcp-residency', () => {
       assert.equal(gcpResidency.isGoogleComputeEngine(), true);
     });
 
+    it('should return `false` on macOS even if a MAC address begins with `42:01`', () => {
+      residency.setGCENetworkInterface(true);
+      residency.setGCEPlatform('darwin');
+      residency.setGCELinuxBios(null);
+
+      assert.equal(gcpResidency.isGoogleComputeEngineMACAddress(), false);
+      assert.equal(gcpResidency.isGoogleComputeEngine(), false);
+    });
+
     it('should return `false` if the host MAC address does not begin with `42:01` & is not Linux', () => {
       residency.setGCENetworkInterface(false);
       residency.setGCEPlatform('win32');

core/packages/gcp-metadata/test/index.test.ts

@@ -785,6 +785,7 @@ describe('unit test', () => {
     it('should match gcp residency results by default', () => {
       // Set as GCP
       residency.setGCENetworkInterface(true);
+      residency.setGCEPlatform('linux');
       gcp.setGCPResidency();
       assert.equal(gcp.gcpResidencyCache, true);