feat(py): per-launcher python_version/freethreaded on py_venv_exec over a shared venv - #1515
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📝 WalkthroughWalkthroughChangesThe change adds a launcher-to-venv transition for Versioned virtual environment execution
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🔵 Low · up to The change enables per-launcher Python version and free-threading settings over a shared virtual environment, but the free-threading detection can fail on Windows and prevent affected targets from running. The PR is mergeable with explicit owner awareness and a follow-up to use a platform-independent check. Sequence Diagram(s)sequenceDiagram
participant py_venv_exec_test
participant py_venv_exec
participant venv_python_transition
participant shared_versioned_venv
participant entry_versioned.py
py_venv_exec_test->>py_venv_exec: provide python_version and freethreaded
py_venv_exec->>venv_python_transition: transition shared venv configuration
venv_python_transition->>shared_versioned_venv: resolve configured interpreter
shared_versioned_venv-->>py_venv_exec: provide VirtualenvInfo
py_venv_exec->>entry_versioned.py: execute in configured environment
entry_versioned.py-->>py_venv_exec_test: report version and ABI assertions
Suggested reviewers: 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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py_binary startup benchmark
sys.path quality
Bazel analysis benchmark
py_image_layer benchmark
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Inline comments:
In `@py/tests/py-venv-multi-exec/entry_versioned.py`:
- Line 15: Update the free-threading assertion in entry_versioned.py to use
sysconfig.get_config_var("Py_GIL_DISABLED") == 1 instead of accessing
sys.abiflags, ensuring the check works on Windows and other platforms.
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📒 Files selected for processing (7)
py/private/py_image_layer.bzlpy/private/py_pex_binary.bzlpy/private/py_venv/py_venv_exec.bzlpy/private/transitions.bzlpy/tests/py-venv-multi-exec/BUILD.bazelpy/tests/py-venv-multi-exec/entry_versioned.pypy/tests/reset-data-edges/tests.bzl
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…er a shared venv Add `python_version` and `freethreaded` attributes to py_venv_exec and configure its `venv` edge with a new venv_python_transition: when the launcher sets either, the edge forwards them so Bazel resolves the shared venv label independently per consumer configuration; unset, the inherited settings pass through untouched and the venv's own rule transition remains the sole authority for resolving and validating its attributes. Several launchers can now share one py_venv label across interpreter versions and GIL modes instead of declaring a venv per configuration. A transitioned label attribute presents as a single-element list, so the consumers that read the `venv` edge unwrap it: the py_venv_exec impl, the py_image_layer and py_pex_binary aspects, and the reset-data-edges test probe. Tested with three launchers resolving one venv under 3.12, 3.13, and 3.13 free-threaded, each asserting its interpreter version and ABI at runtime.
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2 participants
Prefactor for #1506
Changes are visible to end-users: no
Test plan