version() fails on anyio >= 3: cancelled_caughtshould becancel_called`

[goldnews]

Bug Report: jupyterlab-git 0.54.1 Fails to Detect Git Due to anyio API Incompatibility

Summary

jupyterlab_git_core/git.py uses the deprecated attribute scope.cancelled_caught, which was removed in anyio 3. This causes every call to the version() method (and potentially other methods using __execute()) to raise an AttributeError, silently returning None. The frontend then displays:

"git command not found - please ensure you have Git > 2 installed"
(or localized: "git 命令未找到 - 请确保您已安装 Git 2 或更高版本")

even though Git is correctly installed and available in the system PATH.

Root Cause

In jupyterlab_git_core/git.py, line 268, the attribute scope.cancelled_caught is used:

# git.py, line 268 — current code (BROKEN)
with anyio.move_on_after(self._execute_timeout) as scope:
    await lock.acquire()
if scope.cancelled_caught:   # <-- renamed in anyio 3
    return 1, "", "Unable to get the lock on the directory"

In anyio 1.x / 2.x, the attribute was named cancelled_caught. Starting from anyio 3.x, it was renamed to cancel_called.

However, jupyterlab-git-core does not pin an anyio version constraint that prevents installing anyio >= 3. The package metadata only specifies:

anyio

without any upper bound. As a result, any environment with anyio >= 3 (released in 2021) is affected.

The error propagates as follows:

1. Git.version() calls self.__execute(["git", "--version"], cwd=os.curdir) (git.py:1999)
2. __execute() reaches line 268 and tries scope.cancelled_caught → AttributeError
3. The exception propagates up through version() unhandled
4. GitSettingsHandler.get() catches the exception and silently sets gitVersion = None (handlers.py:848-850)
5. The /git/settings API returns {"gitVersion": null, ...}
6. The frontend sees null and displays the "git command not found" error

Minimal Reproduction

import asyncio
from jupyterlab_git_core.git import Git

async def main():
    g = Git()
    version = await g.version()
    print(version)  # Expected: "2.33.0", Actual: AttributeError

asyncio.run(main())

Error:

AttributeError: 'CancelScope' object has no attribute 'cancelled_caught'

Affected Versions

Component	Version
jupyterlab-git	0.54.1
jupyterlab-git-core	0.54.1
anyio	>= 3.0

Fix

Change scope.cancelled_caught to scope.cancel_called in jupyterlab_git_core/git.py line 268:

- if scope.cancelled_caught:
+ if scope.cancel_called:

Recommended Upstream Fix

1. Apply the one-line fix above (rename cancelled_caught → cancel_called)
2. Add a version constraint for anyio in the package metadata to prevent future regressions:

   anyio >= 3.0
   

Environment Details

Item	Value
OS	macOS Darwin 25.5.0
Python	3.10.13
jupyterlab	4.6.2
jupyter-server	2.20.0
jupyterlab-git	0.54.1
jupyterlab-git-core	0.54.1
anyio	3.5.0
git	2.33.0 (via Homebrew)
Shell	zsh (launched from terminal)