On Windows installs where the gateway runs as an SCM service (WinSW,
NSSM, sc.exe create), the existing pause machinery kills the gateway
process directly — and the service wrapper's failure ladder resurrects
it within seconds, re-taking the venv file locks mid-update. The update
then dies partway through dependency sync with access-denied errors.
This extends _pause_windows_gateways_for_update() to detect when a
gateway's process tree is owned by a running SCM service, and to stop
the SERVICE through sc.exe instead of killing the child:
- gateway/status.py: expose service-ownership discovery for gateway
runtimes (find_windows_gateway_services maps validated gateway PIDs
through process ancestry to running SCM service PIDs, with
create-time identity checks against PID reuse).
- hermes_cli/update_cmd.py: stop verified services via sc.exe before
venv mutation and restart them afterward. Stops wait for a stable
SCM 'stopped' state AND for the original descendant processes to
exit (service 'Stopped' is not proof the child released its
handles). Failure to prove ownership, stop a service, or restart it
fails closed; rollback restores attempted services, and rollback
failures are surfaced rather than swallowed.
- Fail-closed throughout: unreadable identities, ambiguous ancestry,
or a service that will not reach a stable state abort the update
before any file mutation.
Complements #37039 (gateway-only concurrent instances no longer abort):
that fix lets the update proceed past the gate; this one makes the
pause actually stick when the gateway is service-supervised.
Note: tests/gateway/test_status.py::TestReadProcessCmdlinePsFallback::
test_ps_fallback_when_proc_unavailable fails on Windows on current main
before this change as well (POSIX ps fallback asserted on a platform
without it); all other touched suites pass (155 passed, 5 skipped).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
