Stop properly sympa container on program failure

docker/sympa/Dockerfile

@@ -49,4 +49,8 @@ ENV LANGUAGE en_US:en
 
 ENV LC_ALL en_US.UTF-8   
 
+COPY exit-event-listener.py /usr/local/bin
+
+RUN chmod +x /usr/local/bin/exit-event-listener.py
+
 ENTRYPOINT /entrypoint

docker/sympa/exit-event-listener.py

+#!/usr/bin/env python3
+# From https://stackoverflow.com/a/37527488
+import os
+import signal
+
+from supervisor import childutils
+
+
+def main():
+    while True:
+        headers, payload = childutils.listener.wait()
+        childutils.listener.ok()
+        if headers['eventname'] != 'PROCESS_STATE_FATAL':
+            continue
+        os.kill(os.getppid(), signal.SIGTERM)
+
+
+if __name__ == "__main__":
+    main()

docker/sympa/supervisord.conf

@@ -126,3 +126,7 @@ stdout_logfile_maxbytes=0
 stderr_logfile_maxbytes=0
 stdout_logfile=/dev/stdout
 stderr_logfile=/dev/stderr
+
+[eventlistener:exit_on_any_fatal]
+events=PROCESS_STATE_FATAL
+command=exit-event-listener.py