#!/bin/bash

# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

# This script updates a cache of the unix group database. It's purpose is to
# speedup group authorization when using large groups with slow nss backends.
# For more info consult the README.groupcache file.
#
# This script can safely be run as root, it will reexec itself as user
# cyrus if needed.
#
# author: Simon Matter, Invoca Systems <simon.matter@invoca.ch>

# changelog
# v1.0.0, Dec 15 2004 Simon Matter <simon.matter@invoca.ch>
# - initial release
#
# v1.0.1, Nov 29 2007 Simon Matter <simon.matter@invoca.ch>
# - add ability to handle "@include" options in imapd.conf, patch
#   provided by Tim Bannister
#
# v1.1.0, Sep 29 2008 Simon Matter <simon.matter@invoca.ch>
# - create group.cache in $PWD

# check that we were called as user 'cyrus'
if [ ! $(whoami) = "cyrus" ]; then
  echo "This script should be run as user 'cyrus' from cyrus-master."
  echo "Check the README to learn howto configure it in /etc/cyrus.conf."
  exit 1
fi

# files get mode 0600
umask 166

TMPCACHE=$(mktemp group.cache.XXXXXX) || exit 1
getent group >> $TMPCACHE
mv -f $TMPCACHE group.cache