Unable to attach to custom embedders

[Janrupf]

Issue

I have a custom embedder, which starts a Flutter development engine. I get the debug URL from the standard output, and running flutter attach --debug-uri=http://127.0.0.1:46517/6mOGj-pv_bU=/ -v successfully attaches to the process. Sadly the option to attach in IntelliJ is grayed out.

Steps to Reproduce

1. Have a custom embedder running
2. Attempt to attach to the custom embedder

Version info

[  +23 ms] Unable to locate an Android SDK.
[  +55 ms] Local engine source at /nix/store/85wqywgs5q16zl34pnfkyaf1w9hgrq14-flutter-engine-c9b9d5780da342eb3f0f5e439a7db06f7d112575
[ +127 ms] executing: [/nix/store/iqnsvd5gs7394zjbq7ll8ks7gzv8zbqz-flutter-wrapped-3.24.1-sdk-links/] git -c log.showSignature=false log -n 1 --pretty=format:%ar
[   +8 ms] Exit code 128 from: git -c log.showSignature=false log -n 1 --pretty=format:%ar
[        ] fatal: detected dubious ownership in repository at '/nix/store/iqnsvd5gs7394zjbq7ll8ks7gzv8zbqz-flutter-wrapped-3.24.1-sdk-links'
           To add an exception for this directory, call:

                git config --global --add safe.directory /nix/store/iqnsvd5gs7394zjbq7ll8ks7gzv8zbqz-flutter-wrapped-3.24.1-sdk-links
[ +177 ms] executing: ping -c 1 -w 1 127.0.0.1
[        ] executing: ping -c 1 -w 1 127.0.0.1
[  +21 ms] [✓] Flutter (Channel stable, 3.24.1, on NixOS 24.11 (Vicuna) 6.6.52, locale en_US.UTF-8)
[        ]     • Flutter version 3.24.1 on channel stable at /nix/store/iqnsvd5gs7394zjbq7ll8ks7gzv8zbqz-flutter-wrapped-3.24.1-sdk-links
[        ]     • Upstream repository https://github.com/flutter/flutter.git
[        ]     • Framework revision nixpkgs000 (), 1970-01-01 00:00:00
[        ]     • Engine revision c9b9d5780d
[        ]     • Dart version 3.5.1
[        ]     • DevTools version 2.37.0
[   +5 ms] [✗] Android toolchain - develop for Android devices
[        ]     ✗ Unable to locate Android SDK.
[        ]       Install Android Studio from: https://developer.android.com/studio/index.html
[        ]       On first launch it will assist you in installing the Android SDK components.
[        ]       (or visit https://flutter.dev/to/linux-android-setup for detailed instructions).
[        ]       If the Android SDK has been installed to a custom location, please use
[        ]       `flutter config --android-sdk` to update to that location.
[   +2 ms] [✗] Chrome - develop for the web (Cannot find Chrome executable at google-chrome)
[        ]     ! Cannot find Chrome. Try setting CHROME_EXECUTABLE to a Chrome executable.
[  +34 ms] PING 127.0.0.1 (127.0.0.1) 56(84) bytes of data.
           64 bytes from 127.0.0.1: icmp_seq=1 ttl=64 time=0.049 ms

           --- 127.0.0.1 ping statistics ---
           1 packets transmitted, 1 received, 0% packet loss, time 0ms
           rtt min/avg/max/mdev = 0.049/0.049/0.049/0.000 ms
[  +65 ms] [✗] Linux toolchain - develop for Linux desktop
[        ]     ✗ clang++ is required for Linux development.
[        ]       It is likely available from your distribution (e.g.: apt install clang), or can be downloaded from https://releases.llvm.org/
[        ]     ✗ CMake is required for Linux development.
[        ]       It is likely available from your distribution (e.g.: apt install cmake), or can be downloaded from https://cmake.org/download/
[        ]     ✗ ninja is required for Linux development.
[        ]       It is likely available from your distribution (e.g.: apt install ninja-build), or can be downloaded from https://github.com/ninja-build/ninja/releases
[        ]     • pkg-config version 0.29.2
[        ]     ✗ GTK 3.0 development libraries are required for Linux development.
[        ]       They are likely available from your distribution (e.g.: apt install libgtk-3-dev)
[   +1 ms] [!] Android Studio (not installed)
[        ]     • Android Studio not found; download from https://developer.android.com/studio/index.html
[        ]       (or visit https://flutter.dev/to/linux-android-setup for detailed instructions).
[   +2 ms] [✓] IntelliJ IDEA Ultimate Edition (version 2024.2)
[        ]     • IntelliJ at /persistent/home/janrupf/.local/share/JetBrains/Toolbox/apps/intellij-idea-ultimate
[        ]     • Flutter plugin version 81.1.3
[        ]     • Dart plugin can be installed from:
[        ]       🔨 https://plugins.jetbrains.com/plugin/6351-dart
[   +2 ms] [✓] Connected device (2 available)
[        ]     • Linux (desktop)                • linux • linux-x64   • NixOS 24.11 (Vicuna) 6.6.52
[        ]     • Rust Flutter Embedder (mobile) • rfe   • linux-arm64 • Rust
[ +314 ms] [✓] Network resources
[        ]     • All expected network resources are available.
[        ] ! Doctor found issues in 4 categories.
[  +10 ms] "flutter doctor" took 764ms.
[  +68 ms] ensureAnalyticsSent: 58ms
[        ] Running 1 shutdown hook
[   +1 ms] Shutdown hooks complete
[  +11 ms] exiting with code 0

(Please note: I'm aware of all the issues from above, however, they do not impact the ability to run the custom embedder!)