Enabled /sbin/init, check for mounted config path and populate with a default if it is blank

Dockerfile

@@ -27,7 +27,11 @@ RUN sed -i -e 's/dc=my-domain,dc=com/c=AU/' /etc/openldap/slapd.ldif \
 	&& mkdir /var/lib/openldap/run \
 	&& chown -R ldap:ldap /etc/openldap/slapd.d /var/lib/openldap/data /var/lib/openldap/run
 
+ENV SLAPD_CONFIG /etc/openldap/slapd.d/cn=config
+RUN cp -pr ${SLAPD_CONFIG} ${SLAPD_CONFIG}.orig
+
+COPY init /sbin/
+
 # Starting
-ENTRYPOINT [ "/usr/sbin/slapd" ]
-CMD [ "-u","ldap","-h","ldapi:/// ldap:/// ldaps:///","-d","256" ]
+ENTRYPOINT [ "/sbin/init" ]
 EXPOSE 389 636

init

@@ -2,18 +2,39 @@
 set -e
 
 NAME="OPENLDAP"
+SLAPD_CONFIG=${SLAPD_CONFIG:-"/etc/openldap/slapd.d/cn=config"}
 
 function stop {
 	echo "Stopping ${NAME}"
 	kill $(cat /var/run/openldap/slapd.pid)
 }
 
+function mp() {
+        set +e
+        mountpoint -q $1
+        local mp=$?
+        set -e
+	return ${mp}
+}
+
 trap 'stop' SIGTERM
 
-if [ "$1" == "start" ]; then
+if [ -z "$@" ]; then
 	SLAPD_URLS="ldapi:/// ldap:/// ldaps:///"
 	SLAPD_OPTIONS="-d 256"
 
+	# If /etc/openldap is an external mount point
+	if mp ${SLAPD_CONFIG}; then
+		echo "* ${SLAPD_CONFIG} is mounted, checking for existing config"
+
+		if [ -f ${SLAPD_CONFIG}/olcDatabase=\{0\}config.ldif ]; then
+			echo "= ${SLAPD_CONFIG} existing configuration detected, aborting..."
+		else
+			echo "- ${SLAPD_CONFIG} populating default configuration"
+			cp -pr ${SLAPD_CONFIG}.orig/* ${SLAPD_CONFIG}
+		fi
+	fi
+
 	[ -x /usr/sbin/slapd ] && /usr/sbin/slapd -u ldap -h "${SLAPD_URLS}" $SLAPD_OPTIONS &
 	wait
 else