#!/bin/sh
# $OpenBSD: INSTALL,v 1.4 2002/01/08 20:22:12 jakob Exp $
#
# Pre/post-installation setup of postfix

PATH=/bin:/usr/bin:/sbin:/usr/sbin
PREFIX=${PKG_PREFIX:-/usr/local}
CONFIG_DIR=/etc/postfix
SAMPLE_CONFIG_DIR=$PREFIX/share/examples/postfix
SPOOL_DIR=/var/spool/postfix

# Function: set up postfix user/group accounts.
#
do_accts()
{
    groupinfo -e postdrop
    if [ $? -eq 0 ]; then
	echo "-> Using group 'postdrop' for postdrop"
    else
        groupinfo -e maildrop
        if [ $? -eq 0 ]; then
	    echo "-> Renaming group 'maildrop' to 'postdrop'"
	    groupmod -n postdrop maildrop
        else
	    echo "-> Creating postdrop group"
	    groupadd postdrop
        fi
    fi

    userinfo -e postfix
    if [ $? -eq 0 ]; then
	echo "-> Using account/group 'postfix' for postfix"
    else
	echo "-> Creating postfix user & group"
	useradd \
	    -g =uid \
	    -c "Postfix Daemon" \
	    -d /nonexistent \
	    -s /sbin/nologin \
	    -p \* \
	    postfix
    fi
}

# Function: set up the postfix spool dir / chroot area
#
do_spooldir()
{
    echo "-> Creating Postfix spool directory and chroot area under $SPOOL_DIR"
    [ -d $SPOOL_DIR ] || install -d -o root -g wheel -m 755 $SPOOL_DIR
    [ -d $SPOOL_DIR/etc ] || install -d -o root -g wheel -m 755 $SPOOL_DIR/etc
    for file in localtime services resolv.conf ; do
	install -o root -g wheel -m 755 /etc/$file $SPOOL_DIR/etc
    done
}

# Function: replace sendmail binaries with postfix
#
do_mailwrapper()
{
    echo "-> Creating /etc/mailer.conf.postfix"
    cat <<MAILER >/tmp/mailer.conf.$$
sendmail	y0y0y0/sbin/sendmail
send-mail	y0y0y0/sbin/sendmail
mailq		y0y0y0/sbin/sendmail
newaliases	y0y0y0/sbin/sendmail
MAILER
    sed "s@y0y0y0@$PREFIX@g" /tmp/mailer.conf.$$ >/etc/mailer.conf.postfix
    rm -f /tmp/mailer.conf.$$
    chown root:wheel /etc/mailer.conf.postfix
    chmod 644 /etc/mailer.conf.postfix
}

# Function: install the postfix configuration files from the samples
#
do_configs()
{
    if [ -d $CONFIG_DIR ]; then
	echo ""
	echo "+---------------"
	echo "| The existing $1 configuration files in $CONFIG_DIR,"
	echo "| have NOT been changed.  You may want to compare them to the"
	echo "| current sample files, $SAMPLE_CONFIG_DIR,"
	echo "| and update your configuration as needed."
	echo "|"
	echo "| Existing $CONFIG_DIR/postfix-script, however, will be"
	echo "| updated to the latest version."
    	echo "+---------------"
	echo ""
    else
	# Install config files.
	install -d -o root -g wheel -m 755 $CONFIG_DIR
	install -o root -g wheel -m 644 $SAMPLE_CONFIG_DIR/* $CONFIG_DIR
	sed "s@y0y0y0@$PREFIX@g" $CONFIG_DIR/main.cf > $CONFIG_DIR/main.cf.$$
	install -o root -g wheel -m 644 $CONFIG_DIR/main.cf.$$ $CONFIG_DIR/main.cf
	rm -f $CONFIG_DIR/main.cf.$$

	# The correct postfix-script will be installed later.
	rm -f $CONFIG_DIR/postfix-script*

	echo ""
	echo "+---------------"
	echo "| The $1 configuration files in $CONFIG_DIR,"
	echo "| have been installed.  Please view these files and change"
	echo "| the configuration to meet your needs."
	echo "+---------------"
	echo ""
    fi

    # Configure setgid postdrop
    install -o root -g wheel -m 555 $SAMPLE_CONFIG_DIR/postfix-script $CONFIG_DIR/postfix-script
    chgrp postdrop $PREFIX/sbin/postdrop $PREFIX/sbin/postqueue
    chmod 2755 $PREFIX/sbin/postdrop $PREFIX/sbin/postqueue
}

# Function: tell the user what s/he needs to do to use the port just installed
#
do_notice()
{
    echo ""
    echo "+---------------"
    echo "| Postfix can be set up to replace sendmail entirely. Please read the"
    echo "| documentation at file:$PREFIX/share/doc/postfix/index.html or"
    echo "| http://www.postfix.org/ carefully before you decide to do this!"
    echo "|"
    echo "| To replace sendmail with postfix you have to install a new mailer.conf"
    echo "| using the following command:"
    echo "|"
    echo "|     $PREFIX/sbin/postfix-enable"
    echo "|"
    echo "| If you want to restore sendmail, this is done using the following command:"
    echo "|"
    echo "|     $PREFIX/sbin/postfix-disable"
    echo "+---------------"
    echo ""
}

# verify proper execution
#
if [ $# -ne 2 ]; then
    echo "usage: $0 distname { PRE-INSTALL | POST-INSTALL }" >&2
    exit 1
fi

# Verify/process the command
#
case $2 in
    PRE-INSTALL)
	do_accts
	;;
    POST-INSTALL)
	do_spooldir
        do_configs $1
	do_mailwrapper
	do_notice
	;;
    *)
	echo "Usage: `basename $0` distname <PRE-INSTALL|POST-INSTALL>" >&2
	exit 1
	;;
esac

exit 0