Set 'Setup Halted' event instead of 'Setup Failed' for exit code 3

Signed-off-by: Nathan LeClaire <nathan.leclaire@gmail.com>

src/utils/SetupUtil.js

@@ -11,6 +11,11 @@ import machine from './DockerMachineUtil';
 import docker from './DockerUtil';
 import router from '../router';
 
+// Docker Machine exits with 3 to differentiate pre-create check failures (e.g.
+// virtualization isn't enabled) from normal errors during create (exit code
+// 1).
+const precreateCheckExitCode = 3;
+
 let _retryPromise = null;
 let _timers = [];
 
@@ -154,11 +159,17 @@ export default {
       } catch (error) {
         router.get().transitionTo('setup');
 
-        let novtx = error.message.indexOf('This computer doesn\'t have VT-X/AMD-v enabled') !== -1;
+        if (error.code === precreateCheckExitCode) {
-        metrics.track(novtx ? 'Setup Halted' : 'Setup Failed', {
+          metrics.track('Setup Halted', {
             virtualBoxVersion,
             machineVersion
           });
+        } else {
+          metrics.track('Setup Failed', {
+            virtualBoxVersion,
+            machineVersion
+          });
+        }
 
         let message = error.message.split('\n');
         let lastLine = message.length > 1 ? message[message.length - 2] : 'Docker Machine encountered an error.';

src/utils/Util.js

@@ -13,7 +13,7 @@ module.exports = {
     return new Promise((resolve, reject) => {
       child_process.execFile(args[0], args.slice(1), options, (error, stdout) => {
         if (error) {
-          reject(new Error('Encountered an error: ' + error));
+          reject(error);
         } else {
           resolve(stdout);
         }