#!/bin/sh
#
# /usr/local/sbin/localmailtransportinit
# Copyright 2006-2008 Jonas Smedegaard <dr@jones.dk>
#
# $Id: localmailtransportupdate,v 1.13 2008-02-13 01:48:51 jonas Exp $
#
# Setup postfix transport map for a redpill organisation
#

set -e

PRG=$(basename $0)

TEMP=$(getopt -s sh -o r:fid:h -l redpill:,force,init,diffopts:,help -n "$PRG" -- "$@")
if [ $? != 0 ] ; then echo "Terminating..." >&2 ; exit 1 ; fi
eval set -- "$TEMP"

usage()	{
	cat <<EOF >&2
Usage: $PRG [opts...] [redpill]

  -r, --redpill              Redpill context
                             (default: read /etc/local-ORG/redpill)
  -f, --force                Update without asking for confirmation
  -i, --init                 Setup postfix to use the transport map
  -d, --diffopts=diffopts    Extra options applied to diff when
                             comparing current and new map
    -h|--help                This help text
EOF
	exit 0
}

exit1()	{
	echo >&2 "Error: $1"
	echo >&2 "Exiting..."
	exit 1
}

redpill=""
force=""
init=""
diffopts=""
while true ; do
	case "$1" in
		-f|--force) force="1"; shift;;
		-i|--init) init="1"; shift;;
		-d|--diffopts) diffopts="$1"; shift 2;;
		-h|--help) usage;;
		--) shift; break;;
		*) exit1 "Internal error!";;
	esac
done

firstitem() {
	file="$1"

	cat "$file" | grep -v '^#' | sed 's/#.*//' | head -n 1
}

items() {
	file="$1"

	cat "$file" | grep -v '^#' | sed 's/#.*//'
}

mktransportmap() {
	redpill="$1"

	echo "# NB! This file was auto-generated by $PRG"
	echo

	redpilldir="/etc/local-$redpill/"
	realms="$(items "$redpilldir/realms")"
	thisrealm="$(cat /etc/local-ORG/realm || dnsdomainname | tr '[a-z]' '[A-Z]')"
	for realm in $realms; do
		[ "$thisrealm" = "$realm" ] && continue
		realmdir="$redpilldir/$realm"
		[ -d "$realmdir" ] || continue
		mailhost="$(firstitem "$realmdir/mailhost")"
		maildomains="$(items "$realmdir/maildomains")"
		for maildomain in $maildomains; do
			echo "$maildomain	relay:[$mailhost]:submission"
		done
	done
}

case $# in
	0) if [ -z "$redpill" ]; then redpill="$(firstitem "/etc/local-ORG/redpill")"; fi;;
	1) redpill="$1";;
	*) exit1 "Wrong number of arguments!";;
esac

[ -n "$redpill" ] || exit1 "Redpill context missing!"

mktransportmap "$redpill" > /etc/postfix/transport.new
if [ -f /etc/postfix/transport.addon ]; then
	cat /etc/postfix/transport.addon >> /etc/postfix/transport.new
fi
( cd /etc/postfix && diff $diffopts transport transport.new || true )
if [ "$force" = "1" ]; then
	do_update="y"
else
	echo -n "Above is the intended changes. OK to update (y/N)? "
	read do_update
fi
case $do_update in
    y|Y)
	mv /etc/postfix/transport.new /etc/postfix/transport
	postmap /etc/postfix/transport
	echo >&2 "Changes applied!"
	;;
    *)
	exit1 "Aborted!"
	;;
esac
if [ "$init" = "1" ]; then
	postconf -e "transport_maps = hash:/etc/postfix/transport"
	invoke-rc.d postfix reload
fi