`hermes gateway restart` on Windows could take the gateway offline with no
replacement. restart() was stop() -> sleep(1.0) -> start(), but the graceful
drain can run up to ~180s while the detached pythonw process stays alive. The
1s sleep let start() run against the still-draining old process; its
"already running" guard then no-opped, and when the old process finally exited
nothing relaunched it.
Two root causes, both fixed:
1. Loose PID detection. `_scan_gateway_pids` and the gateway.status helpers
used substring matches ("... gateway" in cmdline) for lifecycle decisions,
so they false-matched `gateway status`/`dashboard` siblings and unrelated
processes like `python -m tui_gateway`, plus stale gateway.pid records.
Add a shared strict matcher `looks_like_gateway_command_line()` in
gateway/status.py that requires the real `gateway run` subcommand (or the
dedicated entrypoints), and route `_looks_like_gateway_process`,
`_record_looks_like_gateway`, and `_scan_gateway_pids` through it.
2. restart() race. Wait until the gateway is authoritatively gone
(`get_running_pid()` + strict `_gateway_pids()`) before relaunch; force-kill
once if it lingers and raise rather than start a duplicate; verify the
relaunch produced a running gateway and raise loudly if not (no more
exit-0 silent outage).
Scoped to Windows; systemd/launchd restart paths are already drain-aware.
Adds tests/gateway/test_gateway_command_line_matcher.py.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
fd92a3a5c9