The #86687 self-lock preflight fired on every Windows `hermes update`:
bitwarden.py's module-level cryptography import (fixed in #86782 /
#86826-class change) meant cryptography._rust was ALWAYS mapped by the
time the preflight ran, so the update exited 2 before even fetching and
looped forever — including the Desktop in-app update (#86780).
Two structural fixes so the guard can never re-brick the flow it protects:
1. Version-gated detection: _detect_self_loaded_native_modules() now
consults _dependency_sync_would_rewrite(dist) — installed version vs
the on-disk pyproject pins (base deps + all extras, env markers
honored). A loaded module whose distribution the sync will not touch
is no lock risk and is not reported. Unknown → fail closed.
2. Relocated deferral: the check no longer runs pre-fetch. It runs via
_abort_dependency_sync_if_self_locked() immediately before each venv
rewrite (git-path dep sync, ZIP-path dep sync, current-checkout venv
repair) — AFTER the code swap. A deferral now leaves the user on NEW
code with only the dependency install pending (completed by the next
launch's marker recovery), instead of stranding them on the old
checkout in an exit-2 loop.
PyYAML's _yaml extension (loaded by every CLI process) joins the
registry — with version gating it is now safe to list.
Tests: version-gate unit coverage (no-change skip, stale pin, missing
dist, extras, markers, fail-closed None), deferral wiring (marker +
gateway resume + exit 2), placement guards (no detector call pre-fetch;
guard present at git/ZIP sync), and subprocess-verified import hygiene
(import hermes_cli.main and the update --check dispatch never load
cryptography._rust).
Follow-up to #86687 (Halldrix's #83590 salvage — the preflight's intent
stands as defence-in-depth; this makes it fire only when true).
Fixes#86735Fixes#86780Fixes#86781
Teknium
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