"File still doesn't exist" error during conda-pypi mapping fetch

[ssslakter]

Problem

Pixi fails to fetch the conda-pypi mapping with a cryptic error.

Copilot suggested the problem is that the cache directory isn't created via create_dir_all before use, but I don't think that's right. I tried manually creating the directory (see Workaround section), and it didn't fix anything.

The error:

>pixi update
failed to map conda packages to their PyPI equivalents. This mapping is required when using PyPI dependencies alongside conda packages.
  ├─▶ failed to fetch conda-pypi mapping from remote source
  ├─▶ File still doesn't exist
  ╰─▶ No such file or directory (os error 2)

Steps to Reproduce

1. Attempt to run any pixi command in a project with pypi dependency or with pyproject.toml
2. Observe failure and error about missing file or directory

Workaround

Changing the cache location works:

PIXI_CACHE_DIR=/tmp/pixi-test-cache pixi update

But manually creating the directory does NOT work:

mkdir -p ~/.cache/rattler/conda-pypi-mapping

Environment

• Pixi version: 0.63.2
• OS: CentOS Linux
• How was Pixi installed: curl

[nichmor]

hey! Thanks for raising the issue.

Could you please give a small pixi.toml example? Are you running it under some corporate network?

[ssslakter]

I tried it on a test project, it doesn't have any dependencies. I use pyproject.toml. Yes, I'm running on hpc inside a university network

[project]
name = "test"
requires-python = ">= 3.11"
version = "0.1.0"

[build-system]
build-backend = "hatchling.build"
requires = ["hatchling"]

[tool.pixi.workspace]
channels = ["conda-forge"]
platforms = ["linux-64"]

[tool.pixi.pypi-dependencies]
test = { path = ".", editable = true }