Mohamed Hegazy 66a63f2c43
security-guidance: probe for a non-PATH 3.10+ interpreter on HOOK_PY_INCOMPATIBLE (2.0.6 → 2.0.7)
Instrument-first for the macOS Python-3.9 cohort.

v2.0.6 telemetry: ~13.6% of macOS sessions (~6,337 users) run on Apple's
Python 3.9 → HOOK_PY_INCOMPATIBLE → the agentic reviewer can't load (needs
3.10+ syntax). That's ~12x macOS's build-failure rate and the single
biggest macOS degradation. sg-python.sh only probes `python3.1x` on PATH,
so these users have nothing newer ON PATH — but they may still have a
3.10+ installed at a standard location that isn't on the hook's PATH
(Homebrew /opt/homebrew, python.org framework, etc.).

Before building an explicit-path interpreter search, size the RECOVERABLE
fraction: `_probe_alt_python()` checks Homebrew / python.org / distro
locations for a 3.10+ binary and emits the highest found as `sdk_alt_py`
(major*100+minor, or 0 = genuinely 3.9-only). Telemetry-only; probed ONLY
on the HOOK_PY_INCOMPATIBLE path, so healthy sessions never run it.

After a data cycle: non-zero sdk_alt_py = recoverable by an explicit-path
search in sg-python.sh; 0 = needs a user-side Python install (the one-time
notice is the only lever). That decides whether the search is worth building.

Verified locally on macOS Python 3.13:
  - py_compile clean; probe returns 314 on this Mac (homebrew 3.14 present).
  - 7 new tests (test_altpython_probe.py): highest-version selection,
    0-when-none (mocked os.access), framework/distro path parsing, only
    counts 3.10+, and emit gated on outcome==HOOK_PY_INCOMPATIBLE.
  - Full suite 575/575 + 2 skipped.

No behavior change — purely additive telemetry on the incompatible path.
Version 2.0.6 -> 2.0.7 per the per-PR-bump policy (#2114).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-06-15 12:57:33 -07:00
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