scripts: more consistency in `start-mailserver.sh` (#2587)

* consistently name functions (starting with `_`) in `start-mailserver.sh`

Most of the functions that execute the different stacks during startup
were not prefixed with `_`, but all our other functions are. This has
now been fixed.

* cleanup in `start-mailserver.sh`

I adjusted the comments for all sections in the start script so they are
properly displayed again.

target/scripts/start-mailserver.sh

@@ -1,5 +1,6 @@
 #! /bin/bash
 
+# ------------------------------------------------------------
 # ? >> Sourcing helpers & stacks
 #      1. Helpers
 #      2. Checks
@@ -27,24 +28,28 @@ source /usr/local/bin/misc-stack.sh
 # shellcheck source=./startup/daemons-stack.sh
 source /usr/local/bin/daemons-stack.sh
 
+# ------------------------------------------------------------
+# ? << Sourcing helpers & stacks
+# --
+# ? >> Setup Supervisor & DNS names
 # ------------------------------------------------------------
 
 # Setup supervisord as early as possible
 declare -A VARS
 VARS[SUPERVISOR_LOGLEVEL]="${SUPERVISOR_LOGLEVEL:=warn}"
+
 _setup_supervisor
-
-# shellcheck disable=SC2034
-declare -a FUNCS_SETUP FUNCS_FIX FUNCS_CHECK FUNCS_MISC DAEMONS_START
-
 _obtain_hostname_and_domainname
 
 # ------------------------------------------------------------
-# ? <<
+# ? << Setup Supervisor & DNS names
 # --
 # ? >> Setup of default and global values / variables
 # ------------------------------------------------------------
 
+# shellcheck disable=SC2034
+declare -a FUNCS_SETUP FUNCS_FIX FUNCS_CHECK FUNCS_MISC DAEMONS_START
+
 # These variables must be defined first; They are used as default values for other variables.
 VARS[POSTMASTER_ADDRESS]="${POSTMASTER_ADDRESS:=postmaster@${DOMAINNAME}}"
 VARS[REPORT_RECIPIENT]="${REPORT_RECIPIENT:=${POSTMASTER_ADDRESS}}"
@@ -117,7 +122,7 @@ VARS[VIRUSMAILS_DELETE_DELAY]="${VIRUSMAILS_DELETE_DELAY:=7}"
 # ? >> Registering functions
 # ------------------------------------------------------------
 
-function register_functions
+function _register_functions
 {
   _log 'info' 'Initializing setup'
   _log 'debug' 'Registering functions'
@@ -268,24 +273,21 @@ function _register_misc_function
 
 # ------------------------------------------------------------
 # ? << Registering functions
-
-# ------------------------------------------------------------
-# ? << Sourcing all stacks
 # --
-# ? >> Executing all stacks
+# ? >> Executing all stacks / actual start of DMS
 # ------------------------------------------------------------
 
 _log 'info' "Welcome to docker-mailserver $(</VERSION)"
 
-register_functions
-check
-setup
+_register_functions
+_check
+_setup
 [[ ${LOG_LEVEL} =~ (debug|trace) ]] && print-environment
-fix
-start_misc
+_apply_fixes
+_start_misc
 _start_daemons
 
-# marker to check, if container was restarted
+# marker to check if container was restarted
 date >/CONTAINER_START
 
 _log 'info' "${HOSTNAME} is up and running"

target/scripts/startup/check-stack.sh

@@ -1,6 +1,6 @@
 #! /bin/bash
 
-function check
+function _check
 {
   _log 'info' 'Checking configuration'
   for FUNC in "${FUNCS_CHECK[@]}"

target/scripts/startup/fixes-stack.sh

@@ -1,6 +1,6 @@
 #! /bin/bash
 
-function fix
+function _apply_fixes
 {
   _log 'info' 'Post-configuration checks'
   for FUNC in "${FUNCS_FIX[@]}"

target/scripts/startup/misc-stack.sh

@@ -1,6 +1,6 @@
 #! /bin/bash
 
-function start_misc
+function _start_misc
 {
   _log 'info' 'Starting miscellaneous tasks'
   for FUNC in "${FUNCS_MISC[@]}"

target/scripts/startup/setup-stack.sh

@@ -1,6 +1,6 @@
 #! /bin/bash
 
-function setup
+function _setup
 {
   _log 'info' 'Configuring mail server'
   for FUNC in "${FUNCS_SETUP[@]}"