[FRB Codegen] Canonicalization Path Issue

[BjarneNiklas]

Hey, can someone help us with that?

Info: When the project is finished and ready to use, you will be rewarded. AI cannot help us at the moment. Tried on Windows, Linux and Docker.

Problem Description: flutter_rust_bridge_codegen Path Canonicalization Error (os error 2) in Docker and Windows

Tool: flutter_rust_bridge_codegen (tried v2.9.0 and v2.8.0)
Command: flutter_rust_bridge_codegen generate
Error: Consistently fails with Error: Fail to canonicalize path="..." followed by Caused by: No such file or directory (os error 2). This occurs when trying to resolve the Dart output path.
Environment: The issue occurs both on the Windows 11 host (using PowerShell) and, more persistently, inside a Docker container based on ubuntu:latest.

Docker Environment Details

• Base Image: ubuntu:latest
• Project Structure: Code copied via COPY . /app in Dockerfile. Project root inside container is /app.
• CMake: Initially default Ubuntu version, later updated via direct download/install to 3.29.3.
• Rust/Cargo: Installed via rustup.
• Flutter: v3.22.0 (installed via git clone).
• flutter_rust_bridge_codegen: Installed via cargo install --version <version>. Tested versions 2.9.0 and 2.8.0.

Configuration (/app/integrations/world_engine/flutter_rust_bridge.yaml)

The standard configuration uses relative paths:

# Configuration for flutter_rust_bridge_codegen

rust_input: "crate::api"

# Path to the root of the Rust crate (directory containing Cargo.toml)
rust_root: "." # Relative to this config file

dart_output: "../world_engine_bindings/lib/bridge_generated.dart" # Relative to this config file
# Provide a single path for C output
# c_output: "../world_engine_bindings/ios/Classes/bridge_generated.h" # Relative to this config file (still commented)
# Optional: Specify class name if needed
# dart_decl_output: "../world_engine_bindings/lib/src/generated/bridge_definitions.dart"
# class_name: "WorldEngine"

[frb_codegen_path_issue.md](https://github.com/user-attachments/files/19822557/frb_codegen_path_issue.md)

[fzyzcjy]

Replied in #2696