run check and setup functions only on first container start

target/scripts/start-mailserver.sh

@@ -170,21 +170,34 @@ function _register_functions() {
 # ? >> Executing all stacks / actual start of DMS
 # ------------------------------------------------------------
 
-_early_supervisor_setup
-_early_variables_setup
+# fresh container?
+if [[ ! -f /CONTAINER_START ]]; then
+  # first container start
+  _early_supervisor_setup
+  _early_variables_setup
 
-_log 'info' "Welcome to docker-mailserver ${DMS_RELEASE}"
+  _log 'info' "Welcome to docker-mailserver ${DMS_RELEASE}"
 
-_register_functions
-_check
-_setup
-[[ ${LOG_LEVEL} =~ (debug|trace) ]] && print-environment
-_run_user_patches
-_start_daemons
+  _register_functions
+  _check
+  _setup
+  _run_user_patches
+else
+  # container was restarted
+  _early_variables_setup
+
+  _log 'info' 'Container was restarted. Skipping setup routines..'
+  _log 'info' "Welcome to docker-mailserver ${DMS_RELEASE}"
+
+  _register_functions
+fi
 
 # marker to check if container was restarted
 date >/CONTAINER_START
 
+[[ ${LOG_LEVEL} =~ (debug|trace) ]] && print-environment
+_start_daemons
+
 _log 'info' "${HOSTNAME} is up and running"
 
 touch /var/log/mail/mail.log