The existing _live_system_guard (PR #23397) blocked os.kill / os.killpg
and a narrow subset of subprocess invocations. Tests still SIGTERMed the
live gateway today (May 10) because the guard had structural holes.
Plug them all:
- subprocess: also wrap getoutput, getstatusoutput
- os.system, os.popen - completely unwrapped before
- pty.spawn - completely unwrapped before
- asyncio.create_subprocess_exec / create_subprocess_shell - bypassed
the subprocess module entirely; now wrapped
- Subprocess command inspection now looks at the WHOLE command string,
not just tokens[0]. Catches sudo systemctl, env systemctl, bash -c
'systemctl', setsid systemctl, /usr/bin/systemctl, etc.
- New process-killer block: pkill / killall / taskkill / fuser
targeting hermes/python patterns is now refused
- os.kill PID 0 (own group) allowed; PID -1 (every process we can
signal) refused
- subprocess.Popen wrapper preserves __class_getitem__ so third-party
packages that use Popen[bytes] as a type annotation still import
Coverage is locked in by tests/test_live_system_guard_self_test.py -
exercises every primitive against a guaranteed-foreign PID and asserts
the guard fires. Adding a new kill primitive without updating the guard
breaks CI.
scripts/run_tests.sh now also force-loads ~/.hermes/pytest_live_guard.py
when present (developer-machine convenience), so even worktrees that
predate this commit get the protection on subsequent test runs through
the canonical wrapper.
