scripts: refactored daemon-stack.sh (#2496)

* refactored `daemon-stack.sh`

A new method was introduced to uniformaly start daemons and log output
accordingly. The methods for daemon start were renamed (plural ->
singular), therefore the adjustments in `start-mailserver.sh`.

* cleaned Fetchmail setup from `daemon-stack.sh`

Not sure why, but the Fetchmail setup was somehow happening in
`daemon-stack.sh` - this is not supposed to be the case. I relocated the
setup into `setup-stack.sh`, where it belong.

* delete old, unnecessary script in `target/bin/`

These are unused leftovers from the last commit, that relocated the
setup of Fetchmail into `setup.stack.sh`.

* corrected changedetector function name

* Apply suggestions from code review

* adjusted `debug-fetchmail` script

It is absolutely fine to source `setup-stack.sh` because sourcing the
script does not execute a single function (by desing of the script).
This way, we retain functionality.

* praise be ShellCheck

* added `log.sh` to `debug-fetchmail` as a dependency

* final cleanup

Co-authored-by: Brennan Kinney <5098581+polarathene@users.noreply.github.com>
Co-authored-by: Casper <casperklein@users.noreply.github.com>

target/bin/debug-fetchmail

@@ -1,6 +1,11 @@
 #! /bin/bash
 
-/usr/local/bin/setup-fetchmail
+# shellcheck source=../scripts/helpers/log.sh
+source /usr/local/bin/helpers/log.sh
+# shellcheck source=../scripts/startup/setup-stack.sh
+source /usr/local/bin/setup-stack.sh
+
+_setup_fetchmail
 
 su -s /bin/sh -c "/usr/bin/fetchmail \
   --verbose \

target/bin/fetchmailrc_split

@@ -1,55 +0,0 @@
-#! /bin/bash
-
-# Description: This script will split the content of /etc/fetchmailrc into
-#              smaller fetchmailrc files per server [poll] entries. Each
-#              separate fetchmailrc file is stored in /etc/fetchmailrc.d
-#
-#              The mail purpose for this is to work around what is known
-#              as the Fetchmail IMAP idle issue.
-#
-
-FETCHMAILRC="/etc/fetchmailrc"
-FETCHMAILRCD="/etc/fetchmailrc.d"
-DEFAULT_FILE="${FETCHMAILRCD}/defaults"
-
-if [[ ! -r "${FETCHMAILRC}" ]]
-then
-  _log 'error' "File '${FETCHMAILRC}' not found"
-  exit 1
-fi
-
-if [[ ! -d ${FETCHMAILRCD} ]]
-then
-  if ! mkdir "${FETCHMAILRCD}"
-  then
-    _log 'error' "Unable to create folder '${FETCHMAILRCD}'"
-    exit 1
-  fi
-fi
-
-COUNTER=0
-SERVER=0
-while read -r LINE
-do
-  if [[ ${LINE} =~ poll ]]
-  then
-    # If we read "poll" then we reached a new server definition
-    # We need to create a new file with fetchmail defaults from
-    # /etc/fetcmailrc
-    COUNTER=$((COUNTER+1))
-    SERVER=1
-    cat "${DEFAULT_FILE}" > "${FETCHMAILRCD}/fetchmail-${COUNTER}.rc"
-    echo "${LINE}" >> "${FETCHMAILRCD}/fetchmail-${COUNTER}.rc"
-  elif [[ ${SERVER} -eq 0 ]]
-  then
-    # We have not yet found "poll". Let's assume we are still reading
-    # the default settings from /etc/fetchmailrc file
-    echo "${LINE}" >> "${DEFAULT_FILE}"
-  else
-    # Just the server settings that need to be added to the specific rc.d file
-    echo "${LINE}" >> "${FETCHMAILRCD}/fetchmail-${COUNTER}.rc"
-  fi
-# delete commented lines before parsing
-done < <(sed '/^[[:space:]]*#/d' "${FETCHMAILRC}")
-
-rm "${DEFAULT_FILE}"

target/bin/setup-fetchmail

@@ -1,14 +0,0 @@
-#! /bin/bash
-
-CONF=/tmp/docker-mailserver/fetchmail.cf
-RC=/etc/fetchmailrc
-
-if [[ -f ${CONF} ]]
-then
-  cat /etc/fetchmailrc_general "${CONF}" >"${RC}"
-else
-  cat /etc/fetchmailrc_general >"${RC}"
-fi
-
-chmod 700 "${RC}"
-chown fetchmail:root "${RC}"