kornia/kornia

[Bug]: Pixi dependency resolution fails globally due to invalid CUDA targets for macOS

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#3521 opened on Jan 23, 2026

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Description

🐛 Describe the bug

The pixi.toml configuration attempts to solve the cuda environment for all workspace platforms, including osx-arm64. Because CUDA builds of PyTorch do not exist for macOS ARM, the global dependency solver fails. Crucially, this affects users on Linux as well, as pixi add attempts to resolve the lockfile for all platforms simultaneously and fails when it hits the invalid osx-arm64 + cuda combination.

🔄 Steps to Reproduce

1.Clone the repository.
2.Run `pixi add torch` (or any dependency).
3.Error:   × failed to solve requirements of environment 'cuda' for platform 'osx-arm64'
  ├─▶   × failed to solve the environment
  │   
  ╰─▶ Cannot solve the request because of: No candidates were found for torch *.

💻 Minimal Code Example

✅ Expected behavior

The solver should successfully resolve dependencies for the current platform (Linux). The cuda feature should be explicitly restricted to supported platforms (linux, win) in pixi.toml so the solver doesn't attempt to find non-existent packages for macOS.

❌ Actual behavior

The Pixi solver crashes during dependency resolution, blocking developers on Linux from adding or updating packages.

🔧 Environment

OS: Linux (Ubuntu/Debian)
Pixi version: Latest
Context: Trying to set up the dev environment or add packages.

📝 Additional context

🤝 Contribution Intent

  • I plan to submit a PR to fix this bug
  • I'm reporting this bug but not planning to fix it

Contributor guide

Tech stack
python
Domain
build systemdevops
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Basic knowledge of pixiUnderstanding of platform specific dependenciesfamiliarity with pixi.toml syntax
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60
Research direction
The fix requires modifying the `pixi.toml` file to restrict the `cuda` environment to supported platforms (e.g., `linux 64` and `win 64`). Add a `platforms` key to the `[feature.cuda]` section, or use the `target` syntax to specify platform specific dependencies. Ensure the solver only attempts to resolve CUDA packages on platforms that actually have them. No linked PRs or comments indicate ongoing work.