Allow nagios to change ssmtp config

Dockerfile

@@ -18,13 +18,13 @@ RUN apk add --no-cache \
     nagios-plugins-ssl_validity \
     nagios-web \
     nrpe-plugin \
-    ssmtp
-
-USER nagios
+    ssmtp && \
+    chown nagios /etc/ssmtp/ssmtp.conf
 
 COPY FREE_send_notification.sh /usr/bin/FREE_send_notification.sh
-
 COPY entrypoint.sh /docker-entrypoint.sh
 ENTRYPOINT ["/docker-entrypoint.sh"]
 
+USER nagios
+
 CMD ["/usr/sbin/nagios", "/etc/nagios/nagios.cfg"]

entrypoint.sh

@@ -1,5 +1,5 @@
 #!/bin/sh
 
-[ -n "${MAILER_HOST}" ] && sed -r -i "/^mailhub=/s/.*/mailhub=${MAILER_HOST}/" /etc/ssmtp/ssmtp.conf
+[ -n "${MAILER_HOST}" ] && sed -r "/^mailhub=/s/.*/mailhub=${MAILER_HOST}/" /etc/ssmtp/ssmtp.conf > ~/ssmtp.conf && cat ~/ssmtp.conf > /etc/ssmtp/ssmtp.conf
 
 exec $@