anti 43f140a87a feat(cli): auto-spawn forwarder as detached sibling from decnet agent ...

New _spawn_detached(argv, pid_file) helper uses Popen with
start_new_session=True + close_fds=True + DEVNULL stdio to launch a
DECNET subcommand as a fully independent process. The parent does NOT
wait(); if it dies the child survives under init. This is deliberately
not a supervisor — if the child dies the operator restarts it manually.

_pid_dir() picks /opt/decnet when writable else ~/.decnet, so both
root-run production and non-root dev work without ceremony.

`decnet agent` now auto-spawns `decnet forwarder --daemon ...` as
that detached sibling, pulling master host + syslog port from
DECNET_SWARM_MASTER_HOST / DECNET_SWARM_SYSLOG_PORT. --no-forwarder
opts out. If DECNET_SWARM_MASTER_HOST is unset the auto-spawn is
silently skipped (single-host dev or operator wants to start the
forwarder separately).

tests/test_auto_spawn.py monkeypatches subprocess.Popen and verifies:
the detach kwargs are passed, the PID file exists and contains a
valid positive integer (PID-file corruption is a real operational
headache — catching bad writes at the test level is free), the
--no-forwarder flag suppresses the spawn, and the unset-master-host
path silently skips.

2026-04-19 03:23:42 -04:00

5.5 KiB

Raw Blame History

View Raw