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hermes-agent/hermes_cli
Sam Campbell 2fb1e62b2e fix(gateway): multiplex refusal must exit EX_CONFIG (78), not 1
`_guard_named_profile_under_multiplexer` correctly refuses a named-profile
gateway while the default gateway is multiplexing — starting a second one would
double-bind that profile's platforms. The refusal is right; its exit code was
not.

The refusal is decided entirely by configuration (`multiplex_profiles` plus the
allowlist), so it is permanent: no number of retries can change the answer.
Exiting 1 made it look transient to a service manager.

That matters because this module generates the systemd unit, and the template
pairs `Restart=always` / `RestartSec=5` with `StartLimitIntervalSec=0` — it
deliberately trades systemd's generic start-rate limiter for the specific
`RestartPreventExitStatus=GATEWAY_FATAL_CONFIG_EXIT_CODE` backstop declared
three lines below it. Returning 1 left that backstop unarmed with the limiter
already disabled, so a correct, permanent refusal became an unbounded restart
loop. Observed on a host running `multiplex_profiles: true` with a leftover
per-profile unit: 136 refusals in ~13 minutes, stopped only by hand.

`GATEWAY_FATAL_CONFIG_EXIT_CODE` (78, EX_CONFIG) is this codebase's existing
answer for exactly this case — `gateway/restart.py` documents it as the fatal
configuration error that the s6 finish script translates into 125 "permanent
failure" (#51228). This adopts that contract rather than inventing one, so the
fix also works on s6 hosts, not just systemd.

After: one refusal, `status=78/CONFIG`, `NRestarts=0`, unit settles in `failed`.

Also strengthens the two guard tests. They asserted
`pytest.raises(SystemExit, match="1")`, but `match=` is a regex search over
`str(exc)`, so it passed for 1, 21, 100 and 111 alike — it read like an exit-code
assertion while pinning nothing. They now assert
`excinfo.value.code == GATEWAY_FATAL_CONFIG_EXIT_CODE`. The exit code is the
contract here: it is the only thing that tells a supervisor the failure is
permanent.
2026-08-22 03:10:32 +05:30
..
2026-08-21 05:16:27 -07:00
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