uv add struggles with an auto-generated entry in uv.lock

[hoechenberger]

uv add creates a lockfile uv.lock it cannot parse again on re-run.

Steps to reproduce:

• Check out mne-python
• run uv add to add an entry to pyproject.toml. This will also create a uv.lock lockfile:

$ uv toolchain install 3.12
warning: `uv toolchain install` is experimental and may change without warning.
Looking for Python 3.12
Downloading cpython-3.12.3-linux-aarch64-gnu
Installed Python 3.12.3 to /home/mne-user/.local/share/uv/toolchains/cpython-3.12.3-linux-aarch64-gnu
$ uv venv -p /home/mne-user/.local/share/uv/toolchains/cpython-3.12.3-linux-aarch64-gnu/install/bin/python
$ . .venv/bin/activate
$ uv add ipython
warning: `uv add` is experimental and may change without warning.
Resolved 286 packages in 3.61s
error: found distribution vtk==9.3.0 @ registry+https://pypi.org/simple with neither wheels nor source distribution

All good so far: pyproject.toml got updated. The error message about vtk is irritating because vtk is only an "extra" dependency, but this can be ignored for now.

Ok, now let's try to uv add another package:

$ uv add cowsay 
warning: `uv add` is experimental and may change without warning.
Failed to parse lockfile; ignoring locked requirements: TOML parse error at line 492, column 10
    |
492 | marker = ""
    |          ^^
Expected marker value, found end of dependency specification

^
Resolved 287 packages in 1.18s
error: found distribution vtk==9.3.0 @ registry+https://pypi.org/simple with neither wheels nor source distribution

Looking at uv.lock, it turns out the problematic marker entry is for the numpy dependency:

[[distribution.dependencies]]
name = "numpy"
version = "1.26.4"
source = "registry+https://pypi.org/simple"
marker = ""

System info

$ uv --version 
uv 0.2.11
$ uname -a    
Linux 1a34753d5e98 6.6.26-linuxkit #1 SMP Sat Apr 27 04:13:19 UTC 2024 aarch64 GNU/Linux

[charliermarsh]

Thanks!

[charliermarsh]

You can reproduce this with: dependencies = ["cftime==1.6.4"].