Extract launchSimulator to IOSBridge

Summary:
This is related to `simctl` functionality, so can be extracted there.

This will aid in future changes whereby we can hide `getDeviceSetPath` in the IOSBridge module

Reviewed By: passy

Differential Revision: D33842987

fbshipit-source-id: de292ce5afba3e7d79d8ba27c2b8852909d7e6f3

desktop/flipper-server-core/src/devices/ios/IOSBridge.tsx

@@ -12,7 +12,7 @@ import child_process from 'child_process';
 import {DeviceType} from 'flipper-common';
 import {v1 as uuid} from 'uuid';
 import path from 'path';
-import {exec} from 'promisify-child-process';
+import {exec, execFile} from 'promisify-child-process';
 import {getFlipperServerConfig} from '../../FlipperServerConfig';
 
 export const ERR_NO_IDB_OR_XCODE_AVAILABLE =
@@ -72,7 +72,7 @@ class IDBBridge implements IOSBridge {
   }
 }
 
-class SimctlBridge implements IOSBridge {
+export class SimctlBridge implements IOSBridge {
   startLogListener(
     udid: string,
     deviceType: DeviceType,
@@ -114,6 +114,11 @@ class SimctlBridge implements IOSBridge {
       `xcrun simctl io ${serial} recordVideo --codec=h264 --force ${outputFile}`,
     );
   }
+
+  async launchSimulator(udid: string): Promise<any> {
+    await execFile('xcrun', ['simctl', ...getDeviceSetPath(), 'boot', udid]);
+    await execFile('open', ['-a', 'simulator']);
+  }
 }
 
 async function isAvailable(idbPath: string): Promise<boolean> {
@@ -155,6 +160,12 @@ async function readScreenshotIntoBuffer(imagePath: string): Promise<Buffer> {
   return buffer;
 }
 
+export function getDeviceSetPath() {
+  return process.env.DEVICE_SET_PATH
+    ? ['--set', process.env.DEVICE_SET_PATH]
+    : [];
+}
+
 export async function makeIOSBridge(
   idbPath: string,
   isXcodeDetected: boolean,