exim4-config-check-which.sh

#!/bin/bash
# File: exim4-config-which.sh
# Title: Tells you which set of Exim4 config files are being used
#
echo "Determine which configs file that Exim4 is using."
echo

EXIM_BIN_FILESPEC="$(which exim4)"
EXIM_CONF_DIRSPEC="/etc/exim4"
EXIM_CONF_FILESPEC="${EXIM_CONF_DIRSPEC}/exim4.conf"
EXIM_CONF_TEMPLATE_FILESPEC="${EXIM_CONF_DIRSPEC}/exim4.conf.template"
EXIM_CONF_LOCALMACROS_FILESPEC="${EXIM_CONF_DIRSPEC}/exim4.conf.localmacros"
EXIM_UPDATE_CONF_FILESPEC="${EXIM_CONF_DIRSPEC}/update-exim4.conf.conf"

EXIM_CONF_NONDEBIAN_FILESPEC="${EXIM_CONF_FILESPEC}"
EXIM_CONF_NONSPLIT_FILESPEC="${EXIM_CONF_TEMPLATE_FILESPEC}"
EXIM_CONF_SPLIT_FILESPEC="${EXIM_CONF_DIRSPEC}/conf.d/main/01_exim4-config_listmacrosdefs"

VARLIB_EXIM_CONF_DIRSPEC="/var/lib/exim4"
VARLIB_EXIM_CONF_FILESPEC="${VARLIB_EXIM_CONF_DIRSPEC}/config.autogenerated"

if [ ! -f /etc/os-release ]; then
  echo "Probably not a Debian/Devuan OS distro; aborted."
  exit 1
fi
source /etc/os-release
if [ "$ID" != 'debian' ] && [ "$ID" != 'devuan' ]; then
  echo "Not a Debian/Devuan OS distro; aborted."
  exit 1
fi

FOUND_BIN="$(which exim4)"
if [ -z "$FOUND_BIN" ]; then
  echo "Exim4 binary is not found; aborted."
  exit 1
fi

echo "Compiled-in config lookup sequence by ${EXIM_BIN_FILESPEC}:"
exim4 -bV | grep "Configuration file"

echo "$EXIM_BIN_FILESPEC is now using this config file:"
if [ -f "$EXIM_CONF_FILESPEC" ]; then
  echo "              $EXIM_CONF_FILESPEC"
elif [ -f "$VARLIB_EXIM_CONF_FILESPEC" ]; then
  echo "              $VARLIB_EXIM_CONF_FILESPEC"
else
  echo "WARNING: No configuration files given."
  echo "WARNING: exim4 daemon MUST use '-c' CLI runtime option"
fi
echo

if [ -f "$EXIM_CONF_FILESPEC" ]; then

  echo "Exim4 daemon will:"
  echo "  Ignores          : $EXIM_UPDATE_CONF_FILESPEC"
  echo "  Ignores          : $EXIM_CONF_TEMPLATE_FILESPEC"
  echo "  Ignores          : $EXIM_CONF_LOCALMACROS_FILESPEC"
  echo "(update-exim4.conf writes nothing)"
  echo
  echo "  Configs goes into: $EXIM_CONF_NONDEBIAN_FILESPEC"
  echo "  daemon reads from: $EXIM_CONF_FILESPEC"
  echo
  if [ -f "$VARLIB_EXIM_CONF_FILESPEC" ]; then
    echo "WARNING: there is a lingering Debian artifact file that needs removing:"
    echo "    $VARLIB_EXIM_CONF_FILESPEC"
  fi

elif [ -f "$EXIM_UPDATE_CONF_FILESPEC" ]; then
  echo "Reading $EXIM_UPDATE_CONF_FILESPEC for its settings ..."
  # read  update for dc_use_split_config setting
  # grep ????
  DC_USC=$(grep dc_use_split_config "$EXIM_UPDATE_CONF_FILESPEC" | grep -c true )
  if [ "$DC_USC" -eq 0 ]; then
    echo "'dc_use_split_config' is set to 'false' in $EXIM_UPDATE_CONF_FILESPEC"
    echo "  ignores          : $EXIM_CONF_FILESPEC"
    echo "  ignores          : $EXIM_UPDATE_CONF_FILESPEC"
    echo "  ignores          : $EXIM_CONF_LOCALMACROS_FILESPEC"
    echo
    echo "  Configs goes into: $EXIM_CONF_NONSPLIT_FILESPEC"
    echo "  reads from       : $EXIM_CONF_TEMPLATE_FILESPEC"
    echo "  writes to        : $VARLIB_EXIM_CONF_FILESPEC"
    echo "  daemon reads from: $VARLIB_EXIM_CONF_FILESPEC"
  elif [ "$DC_USC" -eq 1 ]; then
    echo "'dc_use_split_config' is set to 'true' in $EXIM_UPDATE_CONF_FILESPEC"
    echo "  ignores          : $EXIM_CONF_FILESPEC"
    echo "  ignores          : $EXIM_CONF_TEMPLATE_FILESPEC"
    echo
    echo "  Configs goes into: $EXIM_CONF_SPLIT_FILESPEC"
    echo "  reads from       : $EXIM_UPDATE_CONF_FILESPEC"
    echo "  reads from       : $EXIM_CONF_LOCALMACROS_FILESPEC"
    echo "  writes to        : $VARLIB_EXIM_CONF_FILESPEC"
    echo "  daemon reads from: $VARLIB_EXIM_CONF_FILESPEC"
  fi
  if [ ! -f "$VARLIB_EXIM_CONF_FILESPEC" ]; then
    echo "File $VARLIB_EXIM_CONF_FILESPEC is missing"
    echo "A simple command:"
    echo "    update-exim4.conf"
    echo "will create this."
  fi

else
  if [ -f "$VARLIB_EXIM_CONF_FILESPEC" ]; then
    echo "WARNING: No configuration files found in $EXIM_CONF_DIRSPEC directory."
    echo "WARNING: Exim4 daemon using the following UNKNOWN config file:"
    echo "    $VARLIB_EXIM_CONF_FILESPEC"
  else
    echo "ERROR: Exim4 daemon will complain that its config file is missing."
    echo 
    echo "Create one of these files:"
    echo "    $EXIM_CONF_FILESPEC"
    echo "    $EXIM_UPDATE_CONF_FILESPEC"
    echo "Aborted."
    exit 3
  fi
fi

# Do simple syntax check
exim4 -bV >/dev/null 2>&1
retsts=$?
if [ $retsts -ne 0 ]; then
  echo
  echo "Simple syntax-check: **** FAILED ****."
fi