; SelfPost process supervision.
;
; Start ORDER is enforced by priority=: OpenDKIM, then the panel (which opens
; the sender check's and the journal-milter's sockets), then the Postfix
; wrapper — which additionally blocks until the milter sockets are ready
; before starting Postfix. (supervisor 4.2.5, docs/configuration.rst,
; [program:x] "priority": "the start and shutdown ordering"; supervisor/
; supervisord.py, runforever(), transitions every group in that order in one
; pass, with no wait for a program to be ready.)
;
; If a managed process of the mail path exhausts its restart retries (FATAL),
; the crashexit event listener brings the whole container down so Docker's
; restart policy starts it again (the same container: docs.docker.com, "Start
; containers automatically", restart policies), rather than lingering with a
; dead component. A program reaches FATAL only through BACKOFF, by exits that
; come before its startsecs (supervisor 4.2.5, supervisor/process.py,
; Subprocess.finish() and transition()): an exit after it is EXITED and simply
; restarted, for ever. logrotate's FATAL is left on Server > Health
; (build/crashexit.py).

[supervisord]
nodaemon=true
user=root
logfile=/dev/null
logfile_maxbytes=0
pidfile=/run/supervisord.pid
loglevel=info

; The control socket is reachable by the shared `selfpost` group so the panel
; (running as the unprivileged `panel` user) can ask supervisord to send
; OpenDKIM a reload signal after it rewrites the DKIM tables. It is still
; unreachable by world; only root and the two SelfPost services are in the
; group. No HTTP auth is configured because access is gated by socket
; permissions, not the network. (supervisor 4.2.5, docs/configuration.rst,
; [unix_http_server]: chmod and chown set the socket's mode and owner; without
; username and password no authentication is asked.)
[unix_http_server]
file=/run/supervisor.sock
chown=root:selfpost
chmod=0770

[rpcinterface:supervisor]
supervisor.rpcinterface_factory = supervisor.rpcinterface:make_main_rpcinterface

[supervisorctl]
serverurl=unix:///run/supervisor.sock

[program:opendkim]
command=/usr/sbin/opendkim -f -x /etc/opendkim.conf
priority=100
autostart=true
autorestart=true
startretries=3
stdout_logfile=/dev/stdout
stdout_logfile_maxbytes=0
stderr_logfile=/dev/stderr
stderr_logfile_maxbytes=0

; user=panel also gives the panel its supplementary groups, selfpost and
; postdrop (build/Dockerfile): supervisor 4.2.5, supervisor/options.py,
; drop_privileges(), os.setgroups() from the user's memberships in
; grp.getgrall().
[program:panel]
command=/usr/local/bin/panel
user=panel
priority=200
autostart=true
autorestart=true
startretries=3
stdout_logfile=/dev/stdout
stdout_logfile_maxbytes=0
stderr_logfile=/dev/stderr
stderr_logfile_maxbytes=0

; startsecs is MILTER_WAIT_TIMEOUT plus ten seconds (build/entrypoint.sh): the
; wrapper's exit when the milter sockets never come counts as too quick, and
; so does a Postfix that will not start. The price: for that long after each
; start the program is STARTING, not RUNNING (supervisor 4.2.5,
; supervisor/options.py, processes_from_section(): startsecs is expanded like
; any value, %(ENV_x)s from supervisord's environment; assumptions C-V6).
; stopwaitsecs covers "postfix stop", which waits five seconds for master
; before it kills (build/postfix-wrapper.sh).
[program:postfix]
command=/usr/local/bin/postfix-wrapper.sh
priority=300
autostart=true
autorestart=true
startsecs=%(ENV_POSTFIX_STARTSECS)s
startretries=3
stopwaitsecs=15
stdout_logfile=/dev/stdout
stdout_logfile_maxbytes=0
stderr_logfile=/dev/stderr
stderr_logfile_maxbytes=0

; One-shot reload helper. The panel runs unprivileged and cannot run `postfix
; reload` itself, and it cannot signal the Postfix master directly: `postfix
; start-fg` forks a separate master process, so a signal to the supervised
; foreground process never reaches it (unlike OpenDKIM, which runs in the
; foreground as the supervised process itself). Instead the panel asks
; supervisord — over the group-accessible control socket — to run this program,
; which runs the canonical `postfix reload` as root - or exits 75 when no
; master runs (build/postfix-reload.sh). autostart is off (it only runs on
; demand). A program that cannot even be spawned twice in a row ends FATAL
; (startretries=1); crashexit leaves that to the page that asked for the
; reload, which reports it (build/crashexit.py; review of stage 2c, F6). (start-fg: see build/postfix-wrapper.sh. supervisor
; 4.2.5, supervisor/process.py, Subprocess.finish(): with startsecs=0 no exit
; counts as "too quickly", so even a failed run ends EXITED - never BACKOFF,
; never FATAL - with its exit status kept, which the panel reads
; (internal/supervisor, RunOnce). Its resting state is STOPPED until the first
; run, EXITED after it; assumptions C-V10.)
[program:postfix-reload]
command=/usr/local/bin/postfix-reload.sh
autostart=false
autorestart=false
startsecs=0
startretries=1
exitcodes=0
stdout_logfile=/dev/stdout
stdout_logfile_maxbytes=0
stderr_logfile=/dev/stderr
stderr_logfile_maxbytes=0

; TLS-certificate refresh. Once a day it compares the certificate the
; reverse-proxy renews in the read-only mount with the copy Postfix reads, and
; when they differ copies it again and runs `postfix reload`.
; Long-running (it loops), runs as root so it can reload Postfix, and never exits
; non-zero, so it neither trips the crashexit listener nor needs restarting.
[program:cert-reload]
command=/usr/local/bin/postfix-cert-reload.sh
priority=400
autostart=true
autorestart=true
startsecs=0
stdout_logfile=/dev/stdout
stdout_logfile_maxbytes=0
stderr_logfile=/dev/stderr
stderr_logfile_maxbytes=0

; Periodic logrotate for /data/log/mail.log (daily, 14 files kept). Runs as
; root so logrotate can read/rotate the log. Exits non-zero at once when the
; config is group/other-writable (logrotate would ignore it silently): with
; startsecs=1 that exit is too quick; once startretries are spent the program
; is FATAL, and Server > Health shows it. With startsecs=0 it was restarted
; every second for ever, RUNNING and EXITED in turn (supervisor 4.2.5,
; supervisor/process.py, Subprocess.finish(); assumptions C-V5). crashexit
; leaves this FATAL alone: logrotate is not on the mail path.
[program:logrotate]
command=/usr/local/bin/logrotate-loop.sh
priority=400
autostart=true
autorestart=true
startsecs=1
startretries=3
stdout_logfile=/dev/stdout
stdout_logfile_maxbytes=0
stderr_logfile=/dev/stderr
stderr_logfile_maxbytes=0

; supervisor 4.2.5, supervisor/process.py: a program enters FATAL only from
; BACKOFF, once startretries are spent; a stop asked of supervisord ends in
; STOPPED (Subprocess.finish(), self.killing), which this listener never sees.
[eventlistener:crashexit]
command=/usr/local/bin/crashexit.py
events=PROCESS_STATE_FATAL
stderr_logfile=/dev/stderr
stderr_logfile_maxbytes=0