#!/bin/sh

if [ $# \< 2 -o $# \> 3 ]; then
	echo "Usage: userforward {account} {forward@address.somewhere} [force]"
	exit 1
fi

user=$1
addr=$2
force=$3

set -e

uid=`id -u $user`
if [ $uid \< 1000 -a "x$force" != "xforce" ]; then
	echo "ERROR: User is not a real user (uid too low)!"
	exit 1
fi

homedir=`getent passwd $user | awk -F: '{print $6}';`

if [ -e $homedir/.forward -a "x$force" != "xforce" ]; then
	echo "ERROR: User \"$user\" already has a .forward!"
	exit 1
fi

if [ -d $homedir ]; then
	touch $homedir/.forward
	echo "echo $addr>$homedir/.forward"
	echo $addr>$homedir/.forward
	chown $user. $homedir/.forward
else
	echo "ERROR: Homedir \"$homedir\" of user \"$user\" doesn't exist!"
	exit 1
fi

mailspool=/var/mail/$user
thismaildomain=`cat /etc/mailname 2> /dev/null || hostname -d`

if [ -f $mailspool ]; then
	if [ -s $mailspool -a -x /usr/bin/formail -a -x /usr/lib/sendmail ]; then
		mv $mailspool $mailspool.off
		/usr/bin/formail -A "X-Resent-By: postmaster@$thismaildomain" -i "To: $addr" -R Cc: Old-Cc: -R Bcc: Old-Bcc: -s /usr/lib/sendmail -t < $mailspool.off
		rm -f $mailspool.off
		echo "Old incoming mails forwarded to new account."
	else
		echo "OBS! Old incoming mails not forwarded."
	fi
fi
echo "Done!"