fix: python noarch with Conda backend by wolfv · Pull Request #8349 · jdx/mise

wolfv · 2026-02-25T17:44:05Z

A little tweak to get Python noarch pacakges to install properly - we need the python version from the transaction to know the proper site-packages directory ... some internal stuff basically.

Should make

mise use -g conda:ruff

work properly. Example currently fails with

mise ERROR Failed to install conda:ruff@latest: failed to link /Users/wolfv/.local/share/mise/conda-packages/ruff-0.15.2-h279115b_0.conda: cannot install noarch python package because there is no python version specified

gemini-code-assist · 2026-02-25T17:44:19Z

Summary of Changes

Hello @wolfv, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the Conda backend to correctly handle the installation of Python noarch packages. Previously, attempts to install such packages would fail due to missing Python environment information. The changes introduce mechanisms to identify the Python version and site-packages directory from the transaction's solved records or package basenames, ensuring that noarch Python packages can be linked properly within the Conda environment.

Highlights

Python Noarch Support: Implemented support for installing Python noarch packages using the Conda backend, resolving previous installation failures.
PythonInfo Integration: Integrated the PythonInfo struct from the rattler library into the package installation process to provide necessary Python environment details.
Python Info Extraction: Added utility functions (python_info_from_records and python_info_from_basenames) to extract Python version and site-packages path from solved records and package basenames, respectively.

Changelog

src/backend/conda.rs
- Imported PythonInfo struct for handling Python environment details.
- Modified the install_package function signature to accept an optional PythonInfo parameter.
- Introduced python_info_from_records to parse Python version and site-packages path from RepoDataRecords.
- Added python_info_from_basenames to extract Python version from package basenames for locked installs.
- Updated calls to link_package to pass the newly extracted PythonInfo when available.

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greptile-apps · 2026-02-25T17:45:55Z

Greptile Summary

Fixes installation of noarch Python packages (like ruff) by extracting Python version information from the conda transaction. The fix adds two helper functions: python_info_from_records() for fresh installs and python_info_from_basenames() for locked installs. This information is passed to rattler's link_package() to determine the correct site-packages directory path.

Added PythonInfo import from rattler::install
Added python_info parameter to install_package() method
Implemented Python version extraction for both fresh and locked install code paths
Uses ArchiveIdentifier parser to extract version from conda package basenames in locked installs

Confidence Score: 5/5

Safe to merge - well-structured fix with proper error handling
The changes are focused and address a specific bug with noarch Python packages. The implementation follows Rust best practices with proper error handling using Option types and ok() conversions. The logic is symmetrical across both install paths (fresh and locked), and the helper functions are well-documented with clear docstrings.
No files require special attention

Important Files Changed

Filename	Overview
src/backend/conda.rs	Adds `PythonInfo` extraction logic to correctly install noarch Python packages by determining Python version from transaction records or lockfile basenames

_{Last reviewed commit: 4992fa4}

gemini-code-assist

Code Review

This pull request correctly addresses an issue with installing noarch Python packages with the Conda backend by providing PythonInfo to rattler. The implementation introduces helper functions to extract this information from both solved records and package basenames, covering fresh and locked installs. The changes are well-structured and logical. I have one minor suggestion to make the code slightly more idiomatic.

gemini-code-assist · 2026-02-25T17:46:04Z

src/backend/conda.rs

+            let id = ArchiveIdentifier::from_str(b).ok()?;
+            if id.name != "python" {
+                return None;
+            }
+            let version = Version::from_str(&id.version).ok()?;
+            PythonInfo::from_version(&version, None, platform).ok()


The body of this closure can be made slightly more concise and idiomatic by chaining the last two fallible operations with and_then.

let id = ArchiveIdentifier::from_str(b).ok()?; if id.name != "python" { return None; } Version::from_str(&id.version) .ok() .and_then(|version| PythonInfo::from_version(&version, None, platform).ok())

@jdx

### 🐛 Bug Fixes - **(exec)** respect PATH order for virtualenv resolution in mise x by @jdx in [#8342](#8342) - **(task)** revert process group changes that cause hangs with nested mise tasks by @jdx in [#8347](#8347) - **(task)** resolve vars from subdirectory configs for monorepo tasks by @jdx in [#8343](#8343) - **(task)** resolve dependencies before prepare to fix monorepo glob deps by @jdx in [#8353](#8353) - python noarch with Conda backend by @wolfv in [#8349](#8349) ### New Contributors - @wolfv made their first contribution in [#8349](#8349) ## 📦 Aqua Registry Updates #### New Packages (3) - [`alexhallam/tv`](https://github.com/alexhallam/tv) - [`arcanist-sh/hx`](https://github.com/arcanist-sh/hx) - [`dathere/qsv`](https://github.com/dathere/qsv) #### Updated Packages (3) - [`astral-sh/ruff`](https://github.com/astral-sh/ruff) - [`caarlos0/fork-cleaner`](https://github.com/caarlos0/fork-cleaner) - [`rhysd/actionlint`](https://github.com/rhysd/actionlint)

A little tweak to get Python noarch pacakges to install properly - we need the `python` version from the transaction to know the proper site-packages directory ... some internal stuff basically. Should make ``` mise use -g conda:ruff ``` work properly. Example currently fails with ``` mise ERROR Failed to install conda:ruff@latest: failed to link /Users/wolfv/.local/share/mise/conda-packages/ruff-0.15.2-h279115b_0.conda: cannot install noarch python package because there is no python version specified ```

@jdx

### 🐛 Bug Fixes - **(exec)** respect PATH order for virtualenv resolution in mise x by @jdx in [jdx#8342](jdx#8342) - **(task)** revert process group changes that cause hangs with nested mise tasks by @jdx in [jdx#8347](jdx#8347) - **(task)** resolve vars from subdirectory configs for monorepo tasks by @jdx in [jdx#8343](jdx#8343) - **(task)** resolve dependencies before prepare to fix monorepo glob deps by @jdx in [jdx#8353](jdx#8353) - python noarch with Conda backend by @wolfv in [jdx#8349](jdx#8349) ### New Contributors - @wolfv made their first contribution in [jdx#8349](jdx#8349) ## 📦 Aqua Registry Updates #### New Packages (3) - [`alexhallam/tv`](https://github.com/alexhallam/tv) - [`arcanist-sh/hx`](https://github.com/arcanist-sh/hx) - [`dathere/qsv`](https://github.com/dathere/qsv) #### Updated Packages (3) - [`astral-sh/ruff`](https://github.com/astral-sh/ruff) - [`caarlos0/fork-cleaner`](https://github.com/caarlos0/fork-cleaner) - [`rhysd/actionlint`](https://github.com/rhysd/actionlint)

fix python noarch

4992fa4

gemini-code-assist bot reviewed Feb 25, 2026

View reviewed changes

jdx merged commit bfb5786 into jdx:main Feb 25, 2026
35 checks passed

mise-en-dev mentioned this pull request Feb 25, 2026

chore: release 2026.2.21 #8344

Merged

wolfv deleted the fix-python-noarch branch February 26, 2026 06:20

BrewTestBot mentioned this pull request Feb 26, 2026

mise 2026.2.21 Homebrew/homebrew-core#269534

Merged

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fix: python noarch with Conda backend#8349

fix: python noarch with Conda backend#8349
jdx merged 1 commit intojdx:mainfrom
wolfv:fix-python-noarch

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wolfv commented Feb 25, 2026

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gemini-code-assist bot commented Feb 25, 2026

Summary of Changes

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greptile-apps bot commented Feb 25, 2026

Greptile Summary

Confidence Score: 5/5

Important Files Changed

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