[Dovecot] Use events to kill supervisord when main proc dies

[Postfix] Use events to kill supervisord when main proc dies
[SOGo] Use events to kill supervisord when main proc dies

data/Dockerfiles/dovecot/Dockerfile

@@ -107,6 +107,7 @@ COPY sa-rules.sh /usr/local/bin/sa-rules.sh
 COPY maildir_gc.sh /usr/local/bin/maildir_gc.sh
 COPY docker-entrypoint.sh /
 COPY supervisord.conf /etc/supervisor/supervisord.conf
+COPY stop-supervisor.sh /usr/local/sbin/stop-supervisor.sh
 
 RUN chmod +x /usr/local/lib/dovecot/sieve/rspamd-pipe-ham \
   /usr/local/lib/dovecot/sieve/rspamd-pipe-spam \
@@ -115,7 +116,8 @@ RUN chmod +x /usr/local/lib/dovecot/sieve/rspamd-pipe-ham \
   /usr/local/bin/imapsync \
   /usr/local/bin/trim_logs.sh \
   /usr/local/bin/sa-rules.sh \
-  /usr/local/bin/maildir_gc.sh
+  /usr/local/bin/maildir_gc.sh \
+  /usr/local/sbin/stop-supervisor.sh
 
 RUN groupadd -g 5000 vmail \
   && groupadd -g 401 dovecot \

data/Dockerfiles/dovecot/stop-supervisor.sh

@@ -0,0 +1,8 @@
+#!/bin/bash
+
+printf "READY\n";
+
+while read line; do
+  echo "Processing Event: $line" >&2;
+  kill -3 $(cat "/var/run/supervisord.pid")
+done < /dev/stdin

data/Dockerfiles/dovecot/supervisord.conf

@@ -1,6 +1,7 @@
 [supervisord]
 nodaemon=true
 user=root
+pidfile=/var/run/supervisord.pid
 
 [program:syslog-ng]
 command=/usr/sbin/syslog-ng --foreground --no-caps
@@ -17,3 +18,7 @@ autorestart=true
 [program:cron]
 command=/usr/sbin/cron -f
 autorestart=true
+
+[eventlistener:processes]
+command=/usr/local/sbin/stop-supervisor.sh
+events=PROCESS_STATE_STOPPED, PROCESS_STATE_EXITED, PROCESS_STATE_FATAL