[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/postfix/Dockerfile

@@ -48,6 +48,13 @@ COPY postfix.sh /opt/postfix.sh
 COPY rspamd-pipe-ham /usr/local/bin/rspamd-pipe-ham
 COPY rspamd-pipe-spam /usr/local/bin/rspamd-pipe-spam
 COPY whitelist_forwardinghosts.sh /usr/local/bin/whitelist_forwardinghosts.sh
+COPY stop-supervisor.sh /usr/local/sbin/stop-supervisor.sh
+
+RUN chmod +x /opt/postfix.sh \
+  /usr/local/bin/rspamd-pipe-ham \
+  /usr/local/bin/rspamd-pipe-spam \
+  /usr/local/bin/whitelist_forwardinghosts.sh \
+  /usr/local/sbin/stop-supervisor.sh
 
 EXPOSE 588
 

data/Dockerfiles/postfix/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/postfix/supervisord.conf

@@ -13,3 +13,7 @@ autostart=true
 [program:postfix]
 command=/opt/postfix.sh
 autorestart=true
+
+[eventlistener:processes]
+command=/usr/local/sbin/stop-supervisor.sh
+events=PROCESS_STATE_STOPPED, PROCESS_STATE_EXITED, PROCESS_STATE_FATAL