#!/bin/sh
# 2001-07-19 Rafael Skodlar
# Install exim server. Sendmail, if exists is disabled, it's binaries are moved
# on the side and replaced with links to exim binary.

EXIM_DIR=/usr/local/exim
EXIM_CONFIG=/etc/exim
EXIM_RC=/etc/init.d/exim
EXIM_BIN="exim eximon eximon.bin exim_dumpdb exim_fixdb exim_tidydb exinext exiwhat exim_dbmbuild exicyclog exigrep eximstats exiqsumm exim_lock"

TIME=`date '+%Y%m%d_%H%M'`
TAR_DIR=/tmp/exim
EXIM_LOG_DIR=/var/log/exim
SENDMAIL_RC=/etc/init.d/sendmail

if [ -d "${EXIM_DIR}/backup" ]; then
    cd ${EXIM_DIR}
    tar cvfp backup/exim_${TIME}.tar --exclude backup .
else
    [ ! -d "${EXIM_DIR}/bin" ] && mkdir -p ${EXIM_DIR}/bin
    [ ! -d "${EXIM_DIR}/backup" ] && mkdir ${EXIM_DIR}/backup
    [ ! -d "${EXIM_CONFIG}" ] && mkdir $EXIM_CONFIG
    [ ! -d "$EXIM_LOG_DIR" ] && mkdir $EXIM_LOG_DIR
fi

function install()
{

cd $TAR_DIR
echo -e "installing:\n-----------------------------------------------\n"
cp $EXIM_BIN ${EXIM_DIR}/bin
chown root ${EXIM_DIR}/bin/exim
chmod a+x ${EXIM_DIR}/bin/exim
chmod u+s ${EXIM_DIR}/bin/exim
}

if [ -e "$EXIM_RC" ]; then
    $EXIM_RC stop
    install
elif [ ! -e "$EXIM_RC" ]; then
    cd $TAR_DIR
    cp rc.exim /etc/rc.d/init.d/exim
    chkconfig --level 235 exim on

#    [ ! -e "/etc/rc3.d/S80exim" ] && (cd /etc/rc3.d; ln -s ../init.d/exim S80exim)

    USER=`grep exim /etc/passwd | awk -F: '{print $1};' | head -1`
    if [ -z "$USER" ]; then
    	echo -e "Make sure there is exim user and group on your system.\n Suggested UID: 47, GID: 47\nRun the following command to create exim account in Linux:\n"
	echo -e "useradd -c MTA Exim -d /var/spool/exim -u 47 -g 47 -s /bin/false exim"
    	echo -e "After that execute\nchown exim.exim /var/log/exim"
   fi

   if [ ! -e "${EXIM_CONFIG}/exim.conf" ]; then
    cat << EOM

Installing default configuration in /etc/exim/exim.conf
because there is no existing configuration file.
EOM

  cp exim.conf ${EXIM_CONFIG}/exim.conf
  else
    cp ${EXIM_CONFIG}/exim.conf ${EXIM_CONFIG}/exim.conf.$TIME
    echo "Saved previous configuration to: ${EXIM_CONFIG}/exim.conf.$TIME"
    cp exim.conf ${EXIM_CONFIG}/exim.conf
   fi
fi

# Remove Sendmail and create links to Exim in it's place
# It's assumed that binaries exist when sendmail startup script exists
if [ -e "$SENDMAIL_RC" ];then
    chkconfig --level 235 sendmail off
    mv /etc/init.d/sendmail /etc/init.d/sendmail.disabled
    echo "Disabled Sendmail in run levels 2, 3, and 5."
    echo "Moving Sendmail binaries and creating links to exim in it's place."
    cd /usr/sbin
    mv sendmail sendmail.pre-exim
    ln -s ../local/exim/bin/exim sendmail
    cd /usr/lib
    mv sendmail sendmail.pre-exim
    ln -s ../local/exim/bin/exim sendmail
    cd /usr/bin
    mv /usr/bin/newaliases /usr/bin/newaliases.pre-exim
    ln -s ../local/exim/bin/exim newaliases
    mv /usr/bin/mailq /usr/bin/mailq.pre-exim
    ln -s ../local/exim/bin/exim mailq
fi
# EOS