#!/bin/sh

# Pre/post-installation setup of postfix.
#
# dugsong@monkey.org

PATH=/bin:/usr/bin:/sbin:/usr/sbin

PKG_PREFIX=${PKG_PREFIX:-/usr/local}

SMTPUID=6
SMTPGID=6
MAILDROPGID=12

if [ "$2" = "PRE-INSTALL" ]; then
    # Create postfix user and group.
    line=`egrep '^smtp:' /etc/group`
    if [ "$line" != "" ]; then
	SMTPGID=`echo $line | cut -f3 -d:`
    else
	echo "-> Creating smtp group, gid $SMTPGID"
	echo "smtp:*:${SMTPGID}:" >> /etc/group
	echo ""
    fi
    line=`egrep '^smtp:' /etc/passwd`
    if [ "$line" != "" ]; then
	SMTPUID=`echo $line | cut -f3 -d:`
    else
	echo "-> Creating smtp user, uid $SMTPUID"
	chpass -a "smtp:*:${SMTPUID}:${SMTPGID}::::Disgruntled Postal Worker:/nonexistent:/sbin/nologin"
	echo ""
    fi
    echo "-> Using account 'smtp' for postfix, uid $SMTPUID, gid $SMTPGID"
    echo ""
    # Create Postfix maildrop group.
    line=`egrep '^maildrop:' /etc/group`
    if [ "$line" != "" ]; then
        MAILDROPGID=`echo $line | cut -f3 -d:`
    else
        echo "-> Creating maildrop group, gid $MAILDROPGID"
        echo "maildrop:*:${MAILDROPGID}:" >> /etc/group
        echo ""
    fi
    echo "-> Using group 'maildrop' for postdrop, gid $MAILDROP"
    echo ""
    exit 0
fi

if [ "$2" != "POST-INSTALL" ]; then exit 0; fi

echo ""
chgrp maildrop ${PKG_PREFIX}/sbin/postdrop
chmod 2755 ${PKG_PREFIX}/sbin/postdrop

if [ ! -d /etc/postfix ]; then
    echo "-> Creating postfix config directory /etc/postfix"
    mkdir /etc/postfix
    install -m 644 -c ${PKG_PREFIX}/lib/postfix/* /etc/postfix
    chmod 755 /etc/postfix/postfix-script
    echo ""
fi
sed "s@y0y0y0@${PKG_PREFIX}@g" /etc/postfix/main.cf > /etc/postfix/main.cf.$$
mv /etc/postfix/main.cf.$$ /etc/postfix/main.cf

if [ ! -d /var/spool/postfix ]; then
    echo "-> Creating postfix spool directory /var/spool/postfix"
    mkdir -p -m 755 /var/spool/postfix/etc
    (cd /etc ; cp localtime services resolv.conf /var/spool/postfix/etc)
    echo ""
fi

echo "Postfix can be set up to replace sendmail entirely."
echo "Please read the documentation at http://www.postfix.org/"
echo "carefully before you decide to do this!"
echo
printf "Do you want to replace sendmail with postfix? [Y/n] "
read ans
case $ans in n*|N*) exit 0 ;; esac
echo
echo "-> Disabling sendmail"
set -x
mv /usr/sbin/sendmail /usr/sbin/sendmail-orig
mv /usr/bin/mailq /usr/bin/mailq-orig
mv /usr/bin/newaliases /usr/bin/newaliases-orig
chmod 555 /usr/sbin/sendmail-orig /usr/bin/mailq-orig /usr/bin/newaliases-orig
set +x
echo
echo "-> Enabling postfix replacements"
set -x
ln -s ${PKG_PREFIX}/sbin/sendmail /usr/sbin/sendmail
ln -s /usr/sbin/sendmail /usr/bin/mailq
ln -s /usr/sbin/sendmail /usr/bin/newaliases
set +x

exit 0