Push vendor files to devices.

lib/util/promiseutil.js

@@ -0,0 +1,24 @@
+var Promise = require('bluebird')
+
+module.exports.periodicNotify = function(promise, interval) {
+  var resolver = Promise.defer()
+    , timer = setInterval(notify, interval)
+
+  function notify() {
+    resolver.progress()
+  }
+
+  function resolve() {
+    resolver.resolve()
+  }
+
+  function reject() {
+    resolver.reject()
+  }
+
+  promise.then(resolve, reject)
+
+  return resolver.promise.finally(function() {
+    clearInterval(timer)
+  })
+}