packages/flutter_tools/lib/src/ios/ios_deploy.dart - mirrors/flutter - Git at Google

 // Copyright 2014 The Flutter Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 import 'dart:async';

 import 'package:meta/meta.dart';
 import 'package:process/process.dart';

 import '../artifacts.dart';
 import '../base/common.dart';
 import '../base/io.dart';
 import '../base/logger.dart';
 import '../base/platform.dart';
 import '../base/process.dart';
 import '../build_info.dart';
 import '../cache.dart';
 import '../convert.dart';
 import 'code_signing.dart';
 import 'devices.dart';

 // Error message patterns from ios-deploy output
 const String noProvisioningProfileErrorOne = 'Error 0xe8008015';
 const String noProvisioningProfileErrorTwo = 'Error 0xe8000067';
 const String deviceLockedError = 'e80000e2';
 const String unknownAppLaunchError = 'Error 0xe8000022';

 class IOSDeploy {
   IOSDeploy({
     @required Artifacts artifacts,
     @required Cache cache,
     @required Logger logger,
     @required Platform platform,
     @required ProcessManager processManager,
   }) : _platform = platform,
        _cache = cache,
        _processUtils = ProcessUtils(processManager: processManager, logger: logger),
        _logger = logger,
        _binaryPath = artifacts.getArtifactPath(Artifact.iosDeploy, platform: TargetPlatform.ios);

   final Cache _cache;
   final String _binaryPath;
   final Logger _logger;
   final Platform _platform;
   final ProcessUtils _processUtils;

   Map<String, String> get iosDeployEnv {
     // Push /usr/bin to the front of PATH to pick up default system python, package 'six'.
     //
     // ios-deploy transitively depends on LLDB.framework, which invokes a
     // Python script that uses package 'six'. LLDB.framework relies on the
     // python at the front of the path, which may not include package 'six'.
     // Ensure that we pick up the system install of python, which includes it.
     final Map<String, String> environment = Map<String, String>.of(_platform.environment);
     environment['PATH'] = '/usr/bin:${environment['PATH']}';
     environment.addEntries(<MapEntry<String, String>>[_cache.dyLdLibEntry]);
     return environment;
   }

   /// Uninstalls the specified app bundle.
   ///
   /// Uses ios-deploy and returns the exit code.
   Future<int> uninstallApp({
     @required String deviceId,
     @required String bundleId,
   }) async {
     final List<String> launchCommand = <String>[
       _binaryPath,
       '--id',
       deviceId,
       '--uninstall_only',
       '--bundle_id',
       bundleId,
     ];

     return _processUtils.stream(
       launchCommand,
       mapFunction: _monitorFailure,
       trace: true,
       environment: iosDeployEnv,
     );
   }

   /// Installs the specified app bundle.
   ///
   /// Uses ios-deploy and returns the exit code.
   Future<int> installApp({
     @required String deviceId,
     @required String bundlePath,
     @required List<String>launchArguments,
     @required IOSDeviceInterface interfaceType,
   }) async {
     final List<String> launchCommand = <String>[
       _binaryPath,
       '--id',
       deviceId,
       '--bundle',
       bundlePath,
       if (interfaceType != IOSDeviceInterface.network)
         '--no-wifi',
       if (launchArguments.isNotEmpty) ...<String>[
         '--args',
         launchArguments.join(' '),
       ],
     ];

     return _processUtils.stream(
       launchCommand,
       mapFunction: _monitorFailure,
       trace: true,
       environment: iosDeployEnv,
     );
   }

   /// Returns [IOSDeployDebugger] wrapping attached debugger logic.
   ///
   /// This method does not install the app. Call [IOSDeployDebugger.launchAndAttach()]
   /// to install and attach the debugger to the specified app bundle.
   IOSDeployDebugger prepareDebuggerForLaunch({
     @required String deviceId,
     @required String bundlePath,
     @required List<String> launchArguments,
     @required IOSDeviceInterface interfaceType,
   }) {
     // Interactive debug session to support sending the lldb detach command.
     final List<String> launchCommand = <String>[
       'script',
       '-t',
       '0',
       '/dev/null',
       _binaryPath,
       '--id',
       deviceId,
       '--bundle',
       bundlePath,
       '--debug',
       if (interfaceType != IOSDeviceInterface.network)
         '--no-wifi',
       if (launchArguments.isNotEmpty) ...<String>[
         '--args',
         launchArguments.join(' '),
       ],
     ];
     return IOSDeployDebugger(
       launchCommand: launchCommand,
       logger: _logger,
       processUtils: _processUtils,
       iosDeployEnv: iosDeployEnv,
     );
   }

   /// Installs and then runs the specified app bundle.
   ///
   /// Uses ios-deploy and returns the exit code.
   Future<int> launchApp({
     @required String deviceId,
     @required String bundlePath,
     @required List<String> launchArguments,
     @required IOSDeviceInterface interfaceType,
   }) async {
     final List<String> launchCommand = <String>[
       _binaryPath,
       '--id',
       deviceId,
       '--bundle',
       bundlePath,
       if (interfaceType != IOSDeviceInterface.network)
         '--no-wifi',
       '--justlaunch',
       if (launchArguments.isNotEmpty) ...<String>[
         '--args',
         launchArguments.join(' '),
       ],
     ];

     return _processUtils.stream(
       launchCommand,
       mapFunction: _monitorFailure,
       trace: true,
       environment: iosDeployEnv,
     );
   }

   Future<bool> isAppInstalled({
     @required String bundleId,
     @required String deviceId,
   }) async {
     final List<String> launchCommand = <String>[
       _binaryPath,
       '--id',
       deviceId,
       '--exists',
       '--timeout', // If the device is not connected, ios-deploy will wait forever.
       '10',
       '--bundle_id',
       bundleId,
     ];
     final RunResult result = await _processUtils.run(
       launchCommand,
       environment: iosDeployEnv,
     );
     // Device successfully connected, but app not installed.
     if (result.exitCode == 255) {
       _logger.printTrace('$bundleId not installed on $deviceId');
       return false;
     }
     if (result.exitCode != 0) {
       _logger.printTrace('App install check failed: ${result.stderr}');
       return false;
     }
     return true;
   }

   String _monitorFailure(String stdout) => _monitorIOSDeployFailure(stdout, _logger);
 }

 /// lldb attach state flow.
 enum _IOSDeployDebuggerState {
   detached,
   launching,
   attached,
 }

 /// Wrapper to launch app and attach the debugger with ios-deploy.
 class IOSDeployDebugger {
   IOSDeployDebugger({
     @required Logger logger,
     @required ProcessUtils processUtils,
     @required List<String> launchCommand,
     @required Map<String, String> iosDeployEnv,
   }) : _processUtils = processUtils,
         _logger = logger,
         _launchCommand = launchCommand,
         _iosDeployEnv = iosDeployEnv,
         _debuggerState = _IOSDeployDebuggerState.detached;

   /// Create a [IOSDeployDebugger] for testing.
   ///
   /// Sets the command to "ios-deploy" and environment to an empty map.
   @visibleForTesting
   factory IOSDeployDebugger.test({
     @required ProcessManager processManager,
     Logger logger,
   }) {
     final Logger debugLogger = logger ?? BufferLogger.test();
     return IOSDeployDebugger(
       logger: debugLogger,
       processUtils: ProcessUtils(logger: debugLogger, processManager: processManager),
       launchCommand: <String>['ios-deploy'],
       iosDeployEnv: <String, String>{},
     );
   }

   final Logger _logger;
   final ProcessUtils _processUtils;
   final List<String> _launchCommand;
   final Map<String, String> _iosDeployEnv;

   Process _iosDeployProcess;

   Stream<String> get logLines => _debuggerOutput.stream;
   final StreamController<String> _debuggerOutput = StreamController<String>.broadcast();

   bool get debuggerAttached => _debuggerState == _IOSDeployDebuggerState.attached;
   _IOSDeployDebuggerState _debuggerState;

   // (lldb)     run
   // https://github.com/ios-control/ios-deploy/blob/1.11.2-beta.1/src/ios-deploy/ios-deploy.m#L51
   static final RegExp _lldbRun = RegExp(r'\(lldb\)\s*run');

   // (lldb)     run
   // https://github.com/ios-control/ios-deploy/blob/1.11.2-beta.1/src/ios-deploy/ios-deploy.m#L51
   static final RegExp _lldbProcessExit = RegExp(r'Process \d* exited with status =');

   /// Launch the app on the device, and attach the debugger.
   ///
   /// Returns whether or not the debugger successfully attached.
   Future<bool> launchAndAttach() async {
     // Return when the debugger attaches, or the ios-deploy process exits.
     final Completer<bool> debuggerCompleter = Completer<bool>();
     try {
       _iosDeployProcess = await _processUtils.start(
         _launchCommand,
         environment: _iosDeployEnv,
       );
       String lastLineFromDebugger;
       final StreamSubscription<String> stdoutSubscription = _iosDeployProcess.stdout
           .transform<String>(utf8.decoder)
           .transform<String>(const LineSplitter())
           .listen((String line) {
         _monitorIOSDeployFailure(line, _logger);

         // (lldb)     run
         // success
         // 2020-09-15 13:42:25.185474-0700 Runner[477:181141] flutter: Observatory listening on http://127.0.0.1:57782/
         if (_lldbRun.hasMatch(line)) {
           _logger.printTrace(line);
           _debuggerState = _IOSDeployDebuggerState.launching;
           return;
         }
         // Next line after "run" must be "success", or the attach failed.
         // Example: "error: process launch failed"
         if (_debuggerState == _IOSDeployDebuggerState.launching) {
           _logger.printTrace(line);
           final bool attachSuccess = line == 'success';
           _debuggerState = attachSuccess ? _IOSDeployDebuggerState.attached : _IOSDeployDebuggerState.detached;
           if (!debuggerCompleter.isCompleted) {
             debuggerCompleter.complete(attachSuccess);
           }
           return;
         }
         if (line.contains('PROCESS_STOPPED') ||
             line.contains('PROCESS_EXITED') ||
             _lldbProcessExit.hasMatch(line)) {
           // The app exited or crashed, so stop echoing the output.
           // Don't pass any further ios-deploy debugging messages to the log reader after it exits.
           _debuggerState = _IOSDeployDebuggerState.detached;
           _logger.printTrace(line);
           if (!debuggerCompleter.isCompleted) {
             debuggerCompleter.complete(false);
           }
           return;
         }
         if (_debuggerState != _IOSDeployDebuggerState.attached) {
           _logger.printTrace(line);
           return;
         }
         if (lastLineFromDebugger != null && lastLineFromDebugger.isNotEmpty && line.isEmpty) {
           // The lldb console stream from ios-deploy is separated lines by an extra \r\n.
           // To avoid all lines being double spaced, if the last line from the
           // debugger was not an empty line, skip this empty line.
           // This will still cause "legit" logged newlines to be doubled...
         } else {
           _debuggerOutput.add(line);
         }
         lastLineFromDebugger = line;
       });
       final StreamSubscription<String> stderrSubscription = _iosDeployProcess.stderr
           .transform<String>(utf8.decoder)
           .transform<String>(const LineSplitter())
           .listen((String line) {
         _monitorIOSDeployFailure(line, _logger);
         _logger.printTrace(line);
       });
       unawaited(_iosDeployProcess.exitCode.then((int status) {
         _logger.printTrace('ios-deploy exited with code $exitCode');
         _debuggerState = _IOSDeployDebuggerState.detached;
         unawaited(stdoutSubscription.cancel());
         unawaited(stderrSubscription.cancel());
       }).whenComplete(() async {
         if (_debuggerOutput.hasListener) {
           // Tell listeners the process died.
           await _debuggerOutput.close();
         }
         if (!debuggerCompleter.isCompleted) {
           debuggerCompleter.complete(false);
         }
         _iosDeployProcess = null;
       }));
     } on ProcessException catch (exception, stackTrace) {
       _logger.printTrace('ios-deploy failed: $exception');
       _debuggerState = _IOSDeployDebuggerState.detached;
       _debuggerOutput.addError(exception, stackTrace);
     } on ArgumentError catch (exception, stackTrace) {
       _logger.printTrace('ios-deploy failed: $exception');
       _debuggerState = _IOSDeployDebuggerState.detached;
       _debuggerOutput.addError(exception, stackTrace);
     }
     // Wait until the debugger attaches, or the attempt fails.
     return debuggerCompleter.future;
   }

   bool exit() {
     final bool success = (_iosDeployProcess == null) || _iosDeployProcess.kill();
     _iosDeployProcess = null;
     return success;
   }

   void detach() {
     if (!debuggerAttached) {
       return;
     }

     try {
       // Detach lldb from the app process.
       _iosDeployProcess?.stdin?.writeln('process detach');
       _debuggerState = _IOSDeployDebuggerState.detached;
     } on SocketException catch (error) {
       // Best effort, try to detach, but maybe the app already exited or already detached.
       _logger.printTrace('Could not detach from debugger: $error');
     }
   }
 }

 // Maps stdout line stream. Must return original line.
 String _monitorIOSDeployFailure(String stdout, Logger logger) {
   // Installation issues.
   if (stdout.contains(noProvisioningProfileErrorOne) || stdout.contains(noProvisioningProfileErrorTwo)) {
     logger.printError(noProvisioningProfileInstruction, emphasis: true);

     // Launch issues.
   } else if (stdout.contains(deviceLockedError)) {
     logger.printError('''
 ═══════════════════════════════════════════════════════════════════════════════════
 Your device is locked. Unlock your device first before running.
 ═══════════════════════════════════════════════════════════════════════════════════''',
         emphasis: true);
   } else if (stdout.contains(unknownAppLaunchError)) {
     logger.printError('''
 ═══════════════════════════════════════════════════════════════════════════════════
 Error launching app. Try launching from within Xcode via:
     open ios/Runner.xcworkspace

 Your Xcode version may be too old for your iOS version.
 ═══════════════════════════════════════════════════════════════════════════════════''',
         emphasis: true);
   }

   return stdout;
 }
	// Copyright 2014 The Flutter Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	import 'dart:async';

	import 'package:meta/meta.dart';
	import 'package:process/process.dart';

	import '../artifacts.dart';
	import '../base/common.dart';
	import '../base/io.dart';
	import '../base/logger.dart';
	import '../base/platform.dart';
	import '../base/process.dart';
	import '../build_info.dart';
	import '../cache.dart';
	import '../convert.dart';
	import 'code_signing.dart';
	import 'devices.dart';

	// Error message patterns from ios-deploy output
	const String noProvisioningProfileErrorOne = 'Error 0xe8008015';
	const String noProvisioningProfileErrorTwo = 'Error 0xe8000067';
	const String deviceLockedError = 'e80000e2';
	const String unknownAppLaunchError = 'Error 0xe8000022';

	class IOSDeploy {
	IOSDeploy({
	@required Artifacts artifacts,
	@required Cache cache,
	@required Logger logger,
	@required Platform platform,
	@required ProcessManager processManager,
	}) : _platform = platform,
	_cache = cache,
	_processUtils = ProcessUtils(processManager: processManager, logger: logger),
	_logger = logger,
	_binaryPath = artifacts.getArtifactPath(Artifact.iosDeploy, platform: TargetPlatform.ios);

	final Cache _cache;
	final String _binaryPath;
	final Logger _logger;
	final Platform _platform;
	final ProcessUtils _processUtils;

	Map<String, String> get iosDeployEnv {
	// Push /usr/bin to the front of PATH to pick up default system python, package 'six'.
	//
	// ios-deploy transitively depends on LLDB.framework, which invokes a
	// Python script that uses package 'six'. LLDB.framework relies on the
	// python at the front of the path, which may not include package 'six'.
	// Ensure that we pick up the system install of python, which includes it.
	final Map<String, String> environment = Map<String, String>.of(_platform.environment);
	environment['PATH'] = '/usr/bin:${environment['PATH']}';
	environment.addEntries(<MapEntry<String, String>>[_cache.dyLdLibEntry]);
	return environment;
	}

	/// Uninstalls the specified app bundle.
	///
	/// Uses ios-deploy and returns the exit code.
	Future<int> uninstallApp({
	@required String deviceId,
	@required String bundleId,
	}) async {
	final List<String> launchCommand = <String>[
	_binaryPath,
	'--id',
	deviceId,
	'--uninstall_only',
	'--bundle_id',
	bundleId,
	];

	return _processUtils.stream(
	launchCommand,
	mapFunction: _monitorFailure,
	trace: true,
	environment: iosDeployEnv,
	);
	}

	/// Installs the specified app bundle.
	///
	/// Uses ios-deploy and returns the exit code.
	Future<int> installApp({
	@required String deviceId,
	@required String bundlePath,
	@required List<String>launchArguments,
	@required IOSDeviceInterface interfaceType,
	}) async {
	final List<String> launchCommand = <String>[
	_binaryPath,
	'--id',
	deviceId,
	'--bundle',
	bundlePath,
	if (interfaceType != IOSDeviceInterface.network)
	'--no-wifi',
	if (launchArguments.isNotEmpty) ...<String>[
	'--args',
	launchArguments.join(' '),
	],
	];

	return _processUtils.stream(
	launchCommand,
	mapFunction: _monitorFailure,
	trace: true,
	environment: iosDeployEnv,
	);
	}

	/// Returns [IOSDeployDebugger] wrapping attached debugger logic.
	///
	/// This method does not install the app. Call [IOSDeployDebugger.launchAndAttach()]
	/// to install and attach the debugger to the specified app bundle.
	IOSDeployDebugger prepareDebuggerForLaunch({
	@required String deviceId,
	@required String bundlePath,
	@required List<String> launchArguments,
	@required IOSDeviceInterface interfaceType,
	}) {
	// Interactive debug session to support sending the lldb detach command.
	final List<String> launchCommand = <String>[
	'script',
	'-t',
	'0',
	'/dev/null',
	_binaryPath,
	'--id',
	deviceId,
	'--bundle',
	bundlePath,
	'--debug',
	if (interfaceType != IOSDeviceInterface.network)
	'--no-wifi',
	if (launchArguments.isNotEmpty) ...<String>[
	'--args',
	launchArguments.join(' '),
	],
	];
	return IOSDeployDebugger(
	launchCommand: launchCommand,
	logger: _logger,
	processUtils: _processUtils,
	iosDeployEnv: iosDeployEnv,
	);
	}

	/// Installs and then runs the specified app bundle.
	///
	/// Uses ios-deploy and returns the exit code.
	Future<int> launchApp({
	@required String deviceId,
	@required String bundlePath,
	@required List<String> launchArguments,
	@required IOSDeviceInterface interfaceType,
	}) async {
	final List<String> launchCommand = <String>[
	_binaryPath,
	'--id',
	deviceId,
	'--bundle',
	bundlePath,
	if (interfaceType != IOSDeviceInterface.network)
	'--no-wifi',
	'--justlaunch',
	if (launchArguments.isNotEmpty) ...<String>[
	'--args',
	launchArguments.join(' '),
	],
	];

	return _processUtils.stream(
	launchCommand,
	mapFunction: _monitorFailure,
	trace: true,
	environment: iosDeployEnv,
	);
	}

	Future<bool> isAppInstalled({
	@required String bundleId,
	@required String deviceId,
	}) async {
	final List<String> launchCommand = <String>[
	_binaryPath,
	'--id',
	deviceId,
	'--exists',
	'--timeout', // If the device is not connected, ios-deploy will wait forever.
	'10',
	'--bundle_id',
	bundleId,
	];
	final RunResult result = await _processUtils.run(
	launchCommand,
	environment: iosDeployEnv,
	);
	// Device successfully connected, but app not installed.
	if (result.exitCode == 255) {
	_logger.printTrace('$bundleId not installed on $deviceId');
	return false;
	}
	if (result.exitCode != 0) {
	_logger.printTrace('App install check failed: ${result.stderr}');
	return false;
	}
	return true;
	}

	String _monitorFailure(String stdout) => _monitorIOSDeployFailure(stdout, _logger);
	}

	/// lldb attach state flow.
	enum _IOSDeployDebuggerState {
	detached,
	launching,
	attached,
	}

	/// Wrapper to launch app and attach the debugger with ios-deploy.
	class IOSDeployDebugger {
	IOSDeployDebugger({
	@required Logger logger,
	@required ProcessUtils processUtils,
	@required List<String> launchCommand,
	@required Map<String, String> iosDeployEnv,
	}) : _processUtils = processUtils,
	_logger = logger,
	_launchCommand = launchCommand,
	_iosDeployEnv = iosDeployEnv,
	_debuggerState = _IOSDeployDebuggerState.detached;

	/// Create a [IOSDeployDebugger] for testing.
	///
	/// Sets the command to "ios-deploy" and environment to an empty map.
	@visibleForTesting
	factory IOSDeployDebugger.test({
	@required ProcessManager processManager,
	Logger logger,
	}) {
	final Logger debugLogger = logger ?? BufferLogger.test();
	return IOSDeployDebugger(
	logger: debugLogger,
	processUtils: ProcessUtils(logger: debugLogger, processManager: processManager),
	launchCommand: <String>['ios-deploy'],
	iosDeployEnv: <String, String>{},
	);
	}

	final Logger _logger;
	final ProcessUtils _processUtils;
	final List<String> _launchCommand;
	final Map<String, String> _iosDeployEnv;

	Process _iosDeployProcess;

	Stream<String> get logLines => _debuggerOutput.stream;
	final StreamController<String> _debuggerOutput = StreamController<String>.broadcast();

	bool get debuggerAttached => _debuggerState == _IOSDeployDebuggerState.attached;
	_IOSDeployDebuggerState _debuggerState;

	// (lldb) run
	// https://github.com/ios-control/ios-deploy/blob/1.11.2-beta.1/src/ios-deploy/ios-deploy.m#L51
	static final RegExp _lldbRun = RegExp(r'\(lldb\)\s*run');

	// (lldb) run
	// https://github.com/ios-control/ios-deploy/blob/1.11.2-beta.1/src/ios-deploy/ios-deploy.m#L51
	static final RegExp _lldbProcessExit = RegExp(r'Process \d* exited with status =');

	/// Launch the app on the device, and attach the debugger.
	///
	/// Returns whether or not the debugger successfully attached.
	Future<bool> launchAndAttach() async {
	// Return when the debugger attaches, or the ios-deploy process exits.
	final Completer<bool> debuggerCompleter = Completer<bool>();
	try {
	_iosDeployProcess = await _processUtils.start(
	_launchCommand,
	environment: _iosDeployEnv,
	);
	String lastLineFromDebugger;
	final StreamSubscription<String> stdoutSubscription = _iosDeployProcess.stdout
	.transform<String>(utf8.decoder)
	.transform<String>(const LineSplitter())
	.listen((String line) {
	_monitorIOSDeployFailure(line, _logger);

	// (lldb) run
	// success
	// 2020-09-15 13:42:25.185474-0700 Runner[477:181141] flutter: Observatory listening on http://127.0.0.1:57782/
	if (_lldbRun.hasMatch(line)) {
	_logger.printTrace(line);
	_debuggerState = _IOSDeployDebuggerState.launching;
	return;
	}
	// Next line after "run" must be "success", or the attach failed.
	// Example: "error: process launch failed"
	if (_debuggerState == _IOSDeployDebuggerState.launching) {
	_logger.printTrace(line);
	final bool attachSuccess = line == 'success';
	_debuggerState = attachSuccess ? _IOSDeployDebuggerState.attached : _IOSDeployDebuggerState.detached;
	if (!debuggerCompleter.isCompleted) {
	debuggerCompleter.complete(attachSuccess);
	}
	return;
	}
	if (line.contains('PROCESS_STOPPED') \|\|
	line.contains('PROCESS_EXITED') \|\|
	_lldbProcessExit.hasMatch(line)) {
	// The app exited or crashed, so stop echoing the output.
	// Don't pass any further ios-deploy debugging messages to the log reader after it exits.
	_debuggerState = _IOSDeployDebuggerState.detached;
	_logger.printTrace(line);
	if (!debuggerCompleter.isCompleted) {
	debuggerCompleter.complete(false);
	}
	return;
	}
	if (_debuggerState != _IOSDeployDebuggerState.attached) {
	_logger.printTrace(line);
	return;
	}
	if (lastLineFromDebugger != null && lastLineFromDebugger.isNotEmpty && line.isEmpty) {
	// The lldb console stream from ios-deploy is separated lines by an extra \r\n.
	// To avoid all lines being double spaced, if the last line from the
	// debugger was not an empty line, skip this empty line.
	// This will still cause "legit" logged newlines to be doubled...
	} else {
	_debuggerOutput.add(line);
	}
	lastLineFromDebugger = line;
	});
	final StreamSubscription<String> stderrSubscription = _iosDeployProcess.stderr
	.transform<String>(utf8.decoder)
	.transform<String>(const LineSplitter())
	.listen((String line) {
	_monitorIOSDeployFailure(line, _logger);
	_logger.printTrace(line);
	});
	unawaited(_iosDeployProcess.exitCode.then((int status) {
	_logger.printTrace('ios-deploy exited with code $exitCode');
	_debuggerState = _IOSDeployDebuggerState.detached;
	unawaited(stdoutSubscription.cancel());
	unawaited(stderrSubscription.cancel());
	}).whenComplete(() async {
	if (_debuggerOutput.hasListener) {
	// Tell listeners the process died.
	await _debuggerOutput.close();
	}
	if (!debuggerCompleter.isCompleted) {
	debuggerCompleter.complete(false);
	}
	_iosDeployProcess = null;
	}));
	} on ProcessException catch (exception, stackTrace) {
	_logger.printTrace('ios-deploy failed: $exception');
	_debuggerState = _IOSDeployDebuggerState.detached;
	_debuggerOutput.addError(exception, stackTrace);
	} on ArgumentError catch (exception, stackTrace) {
	_logger.printTrace('ios-deploy failed: $exception');
	_debuggerState = _IOSDeployDebuggerState.detached;
	_debuggerOutput.addError(exception, stackTrace);
	}
	// Wait until the debugger attaches, or the attempt fails.
	return debuggerCompleter.future;
	}

	bool exit() {
	final bool success = (_iosDeployProcess == null) \|\| _iosDeployProcess.kill();
	_iosDeployProcess = null;
	return success;
	}

	void detach() {
	if (!debuggerAttached) {
	return;
	}

	try {
	// Detach lldb from the app process.
	_iosDeployProcess?.stdin?.writeln('process detach');
	_debuggerState = _IOSDeployDebuggerState.detached;
	} on SocketException catch (error) {
	// Best effort, try to detach, but maybe the app already exited or already detached.
	_logger.printTrace('Could not detach from debugger: $error');
	}
	}
	}

	// Maps stdout line stream. Must return original line.
	String _monitorIOSDeployFailure(String stdout, Logger logger) {
	// Installation issues.
	if (stdout.contains(noProvisioningProfileErrorOne) \|\| stdout.contains(noProvisioningProfileErrorTwo)) {
	logger.printError(noProvisioningProfileInstruction, emphasis: true);

	// Launch issues.
	} else if (stdout.contains(deviceLockedError)) {
	logger.printError('''
	═══════════════════════════════════════════════════════════════════════════════════
	Your device is locked. Unlock your device first before running.
	═══════════════════════════════════════════════════════════════════════════════════''',
	emphasis: true);
	} else if (stdout.contains(unknownAppLaunchError)) {
	logger.printError('''
	═══════════════════════════════════════════════════════════════════════════════════
	Error launching app. Try launching from within Xcode via:
	open ios/Runner.xcworkspace

	Your Xcode version may be too old for your iOS version.
	═══════════════════════════════════════════════════════════════════════════════════''',
	emphasis: true);
	}

	return stdout;
	}