exim-restart.sh

#!/bin/bash

echo "Reloading Exim4 configuration files ..."
echo

SYSD_UNITNAME_EXIM4="exim4.service"

EXIM4_CONF_FILENAME="exim4.conf"
ETC_EXIM4_CONF_DIRSPEC="/etc/exim4"
ETC_EXIM4_CONF_FILESPEC="${ETC_EXIM4_CONF_DIRSPEC}/$EXIM4_CONF_FILENAME"

EXIM4_CONF_AUTOGEN_FILENAME="config.autogenerated"
VARLIB_EXIM4_CONF_DIRSPEC="/var/lib/exim4"
VARLIB_EXIM4_CONF_FILESPEC="${VARLIB_EXIM4_CONF_DIRSPEC}/$EXIM4_CONF_AUTOGEN_FILENAME"

# Decide which Exim4 config file mode is used:
#   Plain ol' exim4.conf
#   Debian standalone
#   Debian split-file
if [ -f "$ETC_EXIM4_CONF_FILESPEC" ]; then
  # Original Exim4 setup
  EXIM4_CONF_FILESPEC="$ETC_EXIM4_CONF_FILESPEC"
else
  # Both Debian standalone and Debian split-file
  EXIM4_CONF_FILESPEC="$VARLIB_EXIM4_CONF_FILESPEC"
fi

EXIM4_LOG_PANIC="/var/log/exim4/paniclog"

if [ "$USER" != 'root' ]; then
  echo "User $USER cannot run this script; go to 'root' account."
  exit 1
fi

# Pre-emptive check
if [ -s "$EXIM4_LOG_PANIC" ]; then
  tail "$EXIM4_LOG_PANIC"
  echo "Panic Log: $EXIM4_LOG_PANIC"
  echo "Review then empty panic file before starting Exim4; aborted."
  exit 1
fi

echo "Merging config settings into $EXIM4_CONF_FILESPEC ..."
update-exim4.conf -v
retsts=$?
if [ $retsts -ne 0 ]; then
  echo "Error code $retsts in update-exim4.conf"
  exit $retsts
fi
echo

# Syntax checking Exim4
echo "Checking for valid syntax in $EXIM4_CONF_FILESPEC ..."
exim4 -bV -C "$EXIM4_CONF_FILESPEC"
retsts=$?
if [ $retsts -ne 0 ]; then
  echo "Error code $retsts in Exim4 syntax check."
  exit $retsts
fi
echo

echo "Stopping $SYSD_UNITNAME_EXIM4 systemd unit ..."
systemctl stop "$SYSD_UNITNAME_EXIM4"
retsts=$?
if [ $retsts -ne 0 ]; then
  echo "Error code $retsts in 'systemctl stop $SYSD_UNITNAME_EXIM4'"
  exit $retsts
fi

echo "Starting $SYSD_UNITNAME_EXIM4 systemd unit ..."
systemctl start "$SYSD_UNITNAME_EXIM4"
retsts=$?
if [ $retsts -ne 0 ]; then
  echo "Error code $retsts in 'systemctl start $SYSD_UNITNAME_EXIM4'"
  exit $retsts
fi

systemctl status "$SYSD_UNITNAME_EXIM4" | fold
echo
echo "Successfully restarted:"
echo "    Systemd Unit: $SYSD_UNITNAME_EXIM4"
echo "    Config file : $EXIM4_CONF_FILESPEC"

echo "Done."