Creating new lockfile fails with `Eof at character 0`

[Huite]

Checks

• [X] I have checked that this issue has not already been reported.

• [X] I have confirmed this bug exists on the latest version of pixi, using pixi --version.

Reproducible example

Running:

pixi shell

For the following pyproject.toml:

```toml [build-system] requires = ["hatchling"] build-backend = "hatchling.build" [project] name = "xugrid" description = "Xarray extension for unstructured grids" readme = { file = "README.rst", content-type = "text/x-rst" } maintainers = [{ name = "Huite Bootsma", email = "huite.bootsma@deltares.nl" }] requires-python = ">=3.9" dependencies = [ 'pandas', 'numba', 'numba_celltree', 'numpy', 'pooch', 'scipy', 'xarray', ] dynamic = ["version"] classifiers = [ 'Development Status :: 3 - Alpha', 'Intended Audience :: Science/Research', 'License :: OSI Approved :: MIT License', 'Programming Language :: Python', 'Operating System :: OS Independent', 'Programming Language :: Python :: 3', 'Programming Language :: Python :: 3.9', 'Programming Language :: Python :: 3.10', 'Programming Language :: Python :: 3.11', 'Programming Language :: Python :: 3.12', 'Programming Language :: Python :: Implementation :: CPython', 'Topic :: Scientific/Engineering', ] keywords = ['mesh', 'ugrid', 'unstructured grid', 'xarray'] license = { text = "MIT" } [project.urls] Home = "https://github.com/deltares/xugrid" Code = "https://github.com/deltares/xugrid" Issues = "https://github.com/deltares/xugrid/issues" [project.optional-dependencies] all = [ 'geopandas', 'mapbox_earcut', 'matplotlib', 'meshkernel >= 3.0.0', 'netcdf4', 'pooch', 'shapely >= 2.0', 'pyproj', 'zarr', ] [tool.hatch.version] path = "xugrid/__init__.py" [tool.hatch.build.targets.sdist] only-include = ["xugrid", "tests"] [tool.isort] profile = "black" [tool.coverage.report] exclude_lines = [ "pragma: no cover", "@abc.abstractmethod", ] [tool.pixi.project] channels = ["conda-forge"] platforms = ["win-64", "linux-64", "osx-64", "osx-arm64"] [tool.pixi.pypi-dependencies] xugrid = { path = ".", editable = true } [tool.pixi.dependencies] dask = "*" geopandas = "*" mapbox_earcut = "*" matplotlib-base = "*" netcdf4 = "*" numba_celltree = ">=0.1.8" numpy = "<2.0" pip = "*" pooch = "*" pre-commit = "*" pydata-sphinx-theme = "*" pymetis = "*" pyproj = "*" pytest = "*" pytest-cases = "*" pytest-cov = "*" python = ">=3.9" ruff = "*" shapely = ">=2.0" scipy = "*" sphinx = "*" sphinx-gallery = "*" xarray = "*" zarr = "*" ipykernel = "*" # So we can run examples twine = "*" build = "*" [tool.pixi.tasks] install-pre-commit = "pre-commit install" pre-commit = "pre-commit run --all-files" test = "NUMBA_DISABLE_JIT=1 pytest --cov=xugrid --cov-report xml --cov-report term" docs = "NUMBA_DISABLE_JIT=1 sphinx-build docs docs/_build" all = { depends_on = ["pre-commit", "test", "docs"]} pypi-publish = "rm --recursive --force dist && python -m build && twine check dist/* && twine upload dist/*" [tool.pixi.feature.py312.dependencies] python = "3.12.*" [tool.pixi.feature.py311.dependencies] python = "3.11.*" [tool.pixi.feature.py310.dependencies] python = "3.10.*" [tool.pixi.feature.py309.dependencies] python = "3.9.*" [tool.pixi.environments] default = { features = ["py312"], solve-group = "py312" } py312 = { features = ["py312"], solve-group = "py312" } py311 = ["py311"] py310 = ["py310"] py309 = ["py309"] [tool.ruff.lint] # See https://docs.astral.sh/ruff/rules/ select = ["C4", "D2", "D3", "D4", "E", "F", "I", "NPY", "PD"] ignore = [ "D202", "D205", "D206", "D400", "D404", "E402", "E501", "E703", "PD002", "PD901", "PD003", "PD004", ] fixable = ["I"] ignore-init-module-imports = true [tool.ruff.lint.pydocstyle] convention = "numpy" ```

Repo link: https://github.com/Deltares/xugrid

Issue description

This innocuous PR has failing pipelines: https://github.com/Deltares/xugrid/pull/269

So I tried updating the lockfile, but it's giving me this error:

❯ pixi install
 WARN The feature 'all' is defined but not used in any environment
  ⠁ py312:win-64         [00:00:00] loading repodata
    py312:osx-arm64      ..
  ⠁ py309:linux-64       [00:00:00] loading repodata
  ⠁ py312:linux-64       [00:00:00] loading repodata
  ⠁ py309:osx-arm64      [00:00:00] loading repodata
  ⠁ py309:win-64         [00:00:00]
  ⠁ py311:win-64         [00:00:00] loading repodata
  ⠁ py311:linux-64       [00:00:00] loading repodata
  ⠁ py311:osx-64         [00:00:00] loading repodata
  ⠁ py311:osx-arm64      [00:00:00] loading repodata
    py310:osx-64         ..
    py310:osx-arm64      ..
  ⠁ py312:osx-64         [00:00:00] loading repodata
    py309:osx-64         ..
  × failed to instantiate a prefix for 'py311'
  ╰─▶ Eof at character 0

(The warning isn't the issue, although I should address it soon...)

I then tried switching back to the main branch as a sanity check, but I'm unable to generate a new lockfile there as well -- while it was working yesterday. I can still create a lockfile just fine for some other projects of mine.

Expected behavior

My suspicion in this case is that some repodata (maybe for a specific project) is wrong. So in this case, a more meaningful error message would help.

[wolfv]

Do you have any files under .pixi or more specifically .pixi/envs? I am wondering if there are (partial) files under a conda-meta folder.

[Huite]

Thanks, I'll try that now. That makes the most sense. The example above runs if I remove the py311 = ["py311"] bit.

[Huite]

Removing the .pixi directory indeed does the trick. Thanks!

Normally, I think I would've thought of that myself -- but in this case I made a specific change to the pyproject.toml, priming me to think there's where the problem would be.

So a more specific error message would still help!