#!/bin/sh

set -e

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

[ -x /usr/sbin/postalias ] || exit 0
[ -f /etc/postfix/main.cf ] || exit 0
gecos="/var/lib/postfix-cn/aliases_gecos"
grep -q "hash:$gecos" /etc/postfix/main.cf || exit 0

[ -d /var/lib/postfix-cn/ ] || exit 0

# Load CARNET Tools
. /usr/share/carnet-tools/functions.sh

awk -F: '
        $3 >= 100 && $1 != "nobody" && $5 \
        {
                split($5, g, ",");
		if (g[1]=="") {next};
                gsub(/ /, ".", g[1]);
                print tolower(g[1]) ": " $1;
        }' < /etc/passwd > $gecos.dpkg-tmp.$$


if ! cmp -s $gecos.dpkg-tmp.$$ $gecos > /dev/null; then
  cp_mv $gecos.dpkg-tmp.$$ $gecos
  postalias hash:$gecos
else
  rm -f $gecos.dpkg-tmp.$$
fi