#!/bin/sh

# 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

if [ ! -f /etc/imapd.conf ]; then

  echo "ERROR: configuration file not found."

  exit 1

fi

# fallback to su if runuser not available

if [ -x /sbin/runuser ]; then

  RUNUSER=runuser

else

  RUNUSER=su

fi

# force cyrus user for security reasons

if [ ! $(whoami) = "cyrus" ]; then

  exec $RUNUSER - cyrus -c "cd $PWD < /dev/null ; $0"

fi

# files get mode 0600

umask 166

# get_config [config default]

# extracts config option from config file

get_config() {

  if config=$(grep "^$1" /etc/imapd.conf); then

    echo $config | cut -d: -f2

  else

    echo $2

  fi

}

# where to find files and directories

imap_prefix=$(get_config configdirectory /var/lib/imap)

group_cache=${imap_prefix}/group.cache

TMPCACHE=$(mktemp ${group_cache}.XXXXXX) || exit 1

getent group >> $TMPCACHE

mv -f $TMPCACHE $group_cache