feat: Fallback to ios-deploy usage if ios-device lib fails to install…

… the app bundle (appium#1098)

lib/ios-deploy.js

@@ -5,11 +5,13 @@ import { services, utilities } from 'appium-ios-device';
 import B from 'bluebird';
 import log from './logger';
 import _ from 'lodash';
+import { exec } from 'teen_process';
 
 const APPLICATION_INSTALLED_NOTIFICATION = 'com.apple.mobile.application_installed';
 const INSTALLATION_STAGING_DIR = 'PublicStaging';
 const ITEM_PUSH_TIMEOUT = 30 * 1000;
 const APPLICATION_NOTIFICATION_TIMEOUT = 30 * 1000;
+const IOS_DEPLOY = 'ios-deploy';
 
 class IOSDeploy {
 
@@ -31,15 +33,30 @@ class IOSDeploy {
   }
 
   async install (app) {
-    const start = new Date();
+    const start = process.hrtime();
     try {
       const bundlePathOnPhone = await this.pushAppBundle(app);
       await this.installApplication(bundlePathOnPhone);
-      log.info(`Installation is successful after ${new Date() - start}ms`);
     } catch (e) {
-      log.error('Error was thrown during the installation process', e);
-      throw new Error(`Could not install app: '${e.message}'`);
+      log.warn('An error was thrown during the installation process. ' +
+        `Falling back to ${IOS_DEPLOY}`, e);
+      try {
+        await fs.which(IOS_DEPLOY);
+      } catch (e1) {
+        throw new Error(`Could not install '${app}': ` +
+          `${IOS_DEPLOY} utility has not been found in PATH. Is it installed?`);
+      }
+      try {
+        await exec(IOS_DEPLOY, [
+          '--id', this.udid,
+          '--bundle', app,
+        ]);
+      } catch (e1) {
+        throw new Error(`Could not install '${app}': ${e1.stderr || e1.stdout || e1.message}`);
+      }
     }
+    const [seconds, nanos] = process.hrtime(start);
+    log.info(`Installation is successful after ${(seconds + nanos / 1e9).toFixed(3)}s`);
   }
 
   async installApplication (bundlePathOnPhone) {