Debugging one isolate in multi-engine scenario

[WunGCQ]

I'm using multiple flutter and try to connect to one of them, and i try to follow the link
debugging-specific-instances-of-flutter
but the command line tool can not work as the website.
anyone can help?

platform

OS: windows 10
Flutter 2.0.4 • channel stable • https://github.com/flutter/flutter.git
Framework • revision b139559 (13 days ago) • 2021-04-01 14:25:01 -0700
Engine • revision 2dce470
Tools • Dart 2.12.2

Steps to Reproduce

1. Run flutter attach --isolate-filter='debug'

PS D:\work\foo> flutter --version
Flutter 2.0.4 • channel stable • https://github.com/flutter/flutter.git
Framework • revision b1395592de (13 days ago) • 2021-04-01 14:25:01 -0700
Engine • revision 2dce47073a
Tools • Dart 2.12.2

PS D:\work\foo> flutter attach --isolate-filter='debug'
Could not find an option named "isolate-filter".


Run 'flutter -h' (or 'flutter <command> -h') for available flutter commands and options.

$flutter doctor -v
[√] Flutter (Channel stable, 2.0.4, on Microsoft Windows [Version 10.0.19042.867], locale zh-CN)
    • Flutter version 2.0.4 at D:\tools\flutter_windows_2.0.1-stable\flutter
    • Framework revision b1395592de (13 days ago), 2021-04-01 14:25:01 -0700
    • Engine revision 2dce47073a
    • Dart version 2.12.2
    • Pub download mirror https://pub.flutter-io.cn
    • Flutter download mirror https://storage.flutter-io.cn

[√] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
    • Android SDK at C:\Users\wungcq\AppData\Local\Android\sdk
    • Platform android-30, build-tools 30.0.3
    • Java binary at: D:\tools\AndroidStudio\jre\bin\java
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b01)
    • All Android licenses accepted.

[√] Chrome - develop for the web
    • Chrome at C:\Program Files\Google\Chrome\Application\chrome.exe

[√] Android Studio (version 4.1.0)
    • Android Studio at D:\tools\AndroidStudio
    • Flutter plugin can be installed from:
       https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
       https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b01)

[√] Connected device (3 available)
    • MIX 2 (mobile) • 6f7c29fd • android-arm64  • Android 9 (API 28)
    • Chrome (web)   • chrome   • web-javascript • Google Chrome 89.0.4389.114
    • Edge (web)     • edge     • web-javascript • Microsoft Edge 89.0.774.75

• No issues found!

[WunGCQ]

i figured out that the PR (#63336)[https://github.com//pull/63336] REMOVE the l and isolate-filter command support.

I think this is not a good choice... when flutter 2 claimed that it support multiple engines, the debugging work will be a REALLY BIG PROBLEM.

and any one know how can I debug exactly to an selected isloate?

[TahaTesser]

Hi @WunGCQ
Since it was removed, documentation needs an update and probably an alternative solution https://flutter.dev/docs/development/add-to-app/debugging#debugging-specific-instances-of-flutter

The documentation updated is needed in flutter/website, labeling the issue here so the tool team can track this and provide an updated solution for debugging Add to app

[xster]

Repurposing the bug to make sure we have a proper debugging solution for targeting an isolate.