tox-gh fails with AttributeError: '_thread._local' object has no attribute 'installing' when using uv-venv-lock-runner.

Root Cause

uv-venv-lock-runner uses uv sync directly and bypasses the tox_on_install hook, so _STATE.installing is never set. The strict assertion in tox_before_run_commands then fails:

assert _STATE.installing  # This fails

Proposed Fix

Replace the assertion with a defensive check:

installing = getattr(_STATE, "installing", False)
if installing:
    _STATE.installing = False
    print("::endgroup::")

This supports both traditional runners (that call tox_on_install) and lock-based runners (that don't).

Related

• Similar issue fixed in tox-uv: Make sure tox_on_install() hook is called in UvVenvLockRunner._setup_env() tox-uv#241