Not clear why, but child processes are not killed

e2etestrunner.js

@@ -9,6 +9,7 @@ var debug = require('debug')('e2e:runner'),
     semver = require('semver'),
     mailer = require('./mailer.js'),
     superagent = require('superagent'),
+    terminate = require('terminate'),
     util = require('util');
 
 // override debug.log to print only as console.log
@@ -16,11 +17,21 @@ debug.log = console.log.bind(console);
 
 var gLastModified = null; // do not use etag since it only hashes body. touching file to rerun tests is nice
 var gLatestBoxVersion  = null; // for sending mail
+var gNpmTest = null;
+
+function cleanExit() {
+    if (gNpmTest) {
+        debug('Terminating child test process %s', gNpmTest.pid);
+        terminate(gNpmTest.pid, process.exit);
+        gNpmTest = null;
+    } else {
+        debug('No child test process to terminate');
+        process.exit();
+    }
+}
 
 function start() {
-    runTestsIfNeeded(function () {
-        setTimeout(start, 60 * 1000);
-    });
+    setTimeout(runTestsIfNeeded.bind(null, start), 60 * 1000);
 }
 
 function runTestsIfNeeded(callback) {
@@ -73,7 +84,8 @@ function runTests(latestETag, latestBoxVersion, callback) {
 
     debug('Running tests for %s', topic);
 
-    shell.system('e2etestrunner', 'npm test', function (error, stdout, stderr) {
+    gNpmTest = shell.system('e2etestrunner', 'npm test', function (error, stdout, stderr) {
+        gNpmTest = null;
         debug('Final test result', error);
 
         mailer.sendEndToEndTestResult(topic, stdout ? stdout.toString('utf8') : '', stderr ? stderr.toString('utf8') : '', function () { });
@@ -82,4 +94,10 @@ function runTests(latestETag, latestBoxVersion, callback) {
 }
 
 debug('e2etest started.');
+
+process.on('exit', cleanExit);
+process.on('SIGINT', cleanExit); // catch ctrl-c
+process.on('SIGTERM', cleanExit); // catch kill
+process.on('uncaughtException', cleanExit);
+
 start();

package.json

@@ -28,6 +28,7 @@
     "stripe": "^3.5.0",
     "superagent": "^1.2.0",
     "superagent-sync": "^0.1.0",
-    "supererror": "^0.7.0"
+    "supererror": "^0.7.0",
+    "terminate": "^1.0.5"
   }
 }