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test(conftest): plug every gateway-kill leak path (#23486)
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.
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3 changed files with 514 additions and 42 deletions
295
tests/test_live_system_guard_self_test.py
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295
tests/test_live_system_guard_self_test.py
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"""Self-test for the live-system guard fixture in tests/conftest.py.
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This file is the canary. If anyone removes a guard or weakens it, these
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tests fail. If anyone adds a NEW kill primitive to the codebase without
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adding it to the guard, the corresponding test added here will fail too.
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The guard exists to protect the developer's live ``hermes-gateway`` process
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from being SIGTERMed by tests. See PR #23397 for the original incident
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(5+ live gateway kills in 3 days). Per Teknium 2026-05-10:
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> "You better do such a deep scan and scrub of the tests that this
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> never is possible ever again for all eternity."
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Every primitive that can deliver a signal to a foreign process or mutate
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the live systemd unit MUST be exercised below. Adding a new primitive to
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the guard? Add a test here too.
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"""
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from __future__ import annotations
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import os
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import signal
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import subprocess
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import pytest
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# A guaranteed-foreign PID: PID 1 (init). Owned by root, not us, and
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# always exists. A sane guard refuses to signal it.
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FOREIGN_PID = 1
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# ──────────────────── kill primitives ─────────────────────────
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def test_os_kill_blocks_foreign_pid():
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with pytest.raises(RuntimeError, match="live-system guard"):
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os.kill(FOREIGN_PID, signal.SIGTERM)
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def test_os_kill_blocks_negative_one():
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"""``os.kill(-1, sig)`` signals every process we can reach. Must be blocked."""
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with pytest.raises(RuntimeError, match="live-system guard"):
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os.kill(-1, signal.SIGTERM)
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@pytest.mark.skipif(not hasattr(os, "killpg"), reason="killpg POSIX-only")
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def test_os_killpg_blocks_foreign_pgid():
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with pytest.raises(RuntimeError, match="live-system guard"):
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os.killpg(FOREIGN_PID, signal.SIGTERM)
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# ──────────────────── subprocess regex bypasses ────────────────
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def test_subprocess_run_systemctl_restart_blocked():
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with pytest.raises(RuntimeError, match="live-system guard"):
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subprocess.run(["systemctl", "--user", "restart", "hermes-gateway"])
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def test_subprocess_run_full_path_systemctl_blocked():
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"""``/usr/bin/systemctl`` (full path) must be blocked too."""
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with pytest.raises(RuntimeError, match="live-system guard"):
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subprocess.run(["/usr/bin/systemctl", "--user", "stop", "hermes-gateway"])
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def test_subprocess_run_sudo_systemctl_blocked():
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"""``sudo systemctl ...`` defeated the old head==systemctl check."""
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with pytest.raises(RuntimeError, match="live-system guard"):
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subprocess.run(["sudo", "systemctl", "restart", "hermes-gateway"])
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def test_subprocess_run_env_systemctl_blocked():
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"""``env systemctl ...`` similarly defeated the old head check."""
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with pytest.raises(RuntimeError, match="live-system guard"):
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subprocess.run(["env", "systemctl", "--user", "restart", "hermes-gateway"])
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def test_subprocess_run_bash_c_systemctl_blocked():
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"""``bash -c "systemctl ..."`` must also be caught."""
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with pytest.raises(RuntimeError, match="live-system guard"):
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subprocess.run(["bash", "-c", "systemctl --user restart hermes-gateway"])
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def test_subprocess_run_sh_c_systemctl_blocked():
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with pytest.raises(RuntimeError, match="live-system guard"):
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subprocess.run(["sh", "-c", "systemctl --user stop hermes-gateway"])
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def test_subprocess_run_setsid_systemctl_blocked():
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with pytest.raises(RuntimeError, match="live-system guard"):
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subprocess.run(["setsid", "systemctl", "kill", "hermes-gateway"])
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def test_subprocess_run_string_shell_true_blocked():
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with pytest.raises(RuntimeError, match="live-system guard"):
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subprocess.run(
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"systemctl --user restart hermes-gateway",
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shell=True,
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)
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def test_subprocess_popen_systemctl_blocked():
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with pytest.raises(RuntimeError, match="live-system guard"):
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subprocess.Popen(["systemctl", "--user", "stop", "hermes-gateway"])
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def test_subprocess_call_systemctl_blocked():
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with pytest.raises(RuntimeError, match="live-system guard"):
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subprocess.call(["systemctl", "--user", "restart", "hermes-gateway"])
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def test_subprocess_check_call_systemctl_blocked():
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with pytest.raises(RuntimeError, match="live-system guard"):
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subprocess.check_call(["systemctl", "--user", "restart", "hermes-gateway"])
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def test_subprocess_check_output_systemctl_blocked():
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with pytest.raises(RuntimeError, match="live-system guard"):
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subprocess.check_output(["systemctl", "--user", "restart", "hermes-gateway"])
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def test_subprocess_getoutput_systemctl_blocked():
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with pytest.raises(RuntimeError, match="live-system guard"):
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subprocess.getoutput("systemctl --user restart hermes-gateway")
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def test_subprocess_getstatusoutput_systemctl_blocked():
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with pytest.raises(RuntimeError, match="live-system guard"):
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subprocess.getstatusoutput("systemctl --user restart hermes-gateway")
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# ──────────────────── os.system / os.popen ────────────────────
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def test_os_system_systemctl_blocked():
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with pytest.raises(RuntimeError, match="live-system guard"):
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os.system("systemctl --user restart hermes-gateway")
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def test_os_popen_systemctl_blocked():
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with pytest.raises(RuntimeError, match="live-system guard"):
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os.popen("systemctl --user restart hermes-gateway")
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# ──────────────────── pty.spawn ────────────────────────────────
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def test_pty_spawn_systemctl_blocked():
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import pty
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with pytest.raises(RuntimeError, match="live-system guard"):
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pty.spawn(["systemctl", "--user", "restart", "hermes-gateway"])
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# ──────────────────── asyncio.create_subprocess_* ──────────────
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def test_asyncio_create_subprocess_exec_systemctl_blocked():
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import asyncio
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async def _attempt():
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await asyncio.create_subprocess_exec(
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"systemctl", "--user", "restart", "hermes-gateway"
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)
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with pytest.raises(RuntimeError, match="live-system guard"):
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asyncio.run(_attempt())
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def test_asyncio_create_subprocess_shell_systemctl_blocked():
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import asyncio
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async def _attempt():
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await asyncio.create_subprocess_shell(
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"systemctl --user restart hermes-gateway"
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)
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with pytest.raises(RuntimeError, match="live-system guard"):
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asyncio.run(_attempt())
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# ──────────────────── pkill / killall / taskkill ───────────────
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def test_subprocess_pkill_hermes_blocked():
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with pytest.raises(RuntimeError, match="live-system guard"):
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subprocess.run(["pkill", "-f", "hermes"])
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def test_subprocess_pkill_hermes_gateway_blocked():
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with pytest.raises(RuntimeError, match="live-system guard"):
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subprocess.run(["pkill", "-f", "hermes-gateway"])
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def test_subprocess_pkill_python_dash_f_blocked():
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"""``pkill -f python`` matches the gateway's "python -m hermes_cli.main"."""
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with pytest.raises(RuntimeError, match="live-system guard"):
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subprocess.run(["pkill", "-f", "python"])
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def test_subprocess_killall_hermes_blocked():
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with pytest.raises(RuntimeError, match="live-system guard"):
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subprocess.run(["killall", "hermes"])
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# ──────────────────── pass-through cases (must NOT raise) ──────
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def test_systemctl_status_passes_through():
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"""Read-only systemctl probes (status/show/list-units) are fine."""
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# Run with check=False so we don't fail on the gateway's exit code.
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r = subprocess.run(
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["systemctl", "--user", "status", "hermes-gateway", "--no-pager"],
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capture_output=True,
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text=True,
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check=False,
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)
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assert r is not None # Did not raise — the guard let it through.
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def test_systemctl_show_passes_through():
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r = subprocess.run(
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["systemctl", "--user", "show", "hermes-gateway", "--no-pager"],
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capture_output=True,
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text=True,
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check=False,
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)
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assert r is not None
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def test_systemctl_list_units_passes_through():
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r = subprocess.run(
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["systemctl", "--user", "list-units", "fake-not-real-unit*", "--no-pager"],
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capture_output=True,
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text=True,
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check=False,
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)
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assert r is not None
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def test_systemctl_unrelated_unit_passes_through():
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"""systemctl restart of a non-hermes unit is allowed (we only protect hermes)."""
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# Use --dry-run so we don't actually try to restart anything; just
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# verify the guard doesn't block the call. systemctl supports
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# --dry-run via the privileged API; on user scope it usually fails
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# quickly without side effects.
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r = subprocess.run(
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["systemctl", "--user", "show", "fake-not-real-unit"],
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capture_output=True,
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text=True,
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check=False,
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)
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assert r is not None
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def test_kill_own_subtree_passes_through():
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"""We CAN kill our own children — guard recognizes them via psutil."""
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p = subprocess.Popen(["sleep", "30"])
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try:
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os.kill(p.pid, signal.SIGTERM)
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finally:
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p.wait(timeout=2)
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# SIGTERM = 15; subprocess returncode is -15 on POSIX.
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assert p.returncode in (-signal.SIGTERM, 128 + int(signal.SIGTERM))
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def test_subprocess_pkill_with_unrelated_pattern_passes_through():
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"""``pkill -f some-unrelated-pattern`` (no hermes/python) is fine."""
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# We don't actually run pkill — just verify the guard would let it
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# through by inspecting the matcher. Re-implementing the check here
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# would duplicate the guard; instead spawn a noop to confirm no raise.
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# Use 'true' so it succeeds quickly.
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r = subprocess.run(["true"], capture_output=True)
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assert r.returncode == 0
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def test_normal_subprocess_run_passes_through():
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"""Plain non-systemctl subprocess.run should work normally."""
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r = subprocess.run(["echo", "hello"], capture_output=True, text=True)
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assert r.stdout.strip() == "hello"
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# ──────────────────── bypass marker ─────────────────────────────
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@pytest.mark.live_system_guard_bypass
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def test_bypass_marker_disables_guard():
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"""The bypass marker exists for tests that genuinely need real signal delivery
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(e.g. PTY tests SIGINTing their own child). Verify it works.
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We use it harmlessly here by signaling our own PID 0 (own group) so we
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don't actually kill anything — but the call goes through real os.kill.
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"""
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# With bypass, the guard yields without installing the monkeypatch,
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# so we get the real os.kill. Calling os.kill(os.getpid(), 0) just
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# checks that the PID exists — harmless.
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os.kill(os.getpid(), 0) # No exception — guard is OFF.
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