#! @PYTHON@
#
# Copyright (C) 2001,2002 by the Free Software Foundation, Inc.
#
# 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.

"""Regenerate Postfix's data/aliases and data/aliases.db files from scratch.

Usage:

    genaliases [options]

Options:

    -h/--help
        Print this message and exit.
"""

import sys
import os
import getopt
import fcntl

import paths                                      # path hacking
from Mailman import mm_cfg
from Mailman import Utils
from Mailman import MailList
from Mailman.i18n import _



def usage(code, msg=''):
    if code:
        fd = sys.stderr
    else:
        fd = sys.stdout
    print >> fd, _(__doc__)
    if msg:
        print >> fd, msg
    sys.exit(code)



def main():
    try:
        opts, args = getopt.getopt(sys.argv[1:], 'h', ['help'])
    except getopt.error, msg:
        usage(1, msg)

    for opt, arg in opts:
        if opt in ('-h', '--help'):
            usage(0)

    if args:
        usage(1)

    # Open up the MTA specific module
    modulename = 'Mailman.MTA.' + mm_cfg.MTA
    __import__(modulename)
    MTA = sys.modules[modulename]

    # Open the text file and Berkeley DB files, truncating any data already
    # there.  We need to acquire a lock so nobody tries to update the files
    # while we're doing it.
    lock = MTA.makelock()
    lock.lock()
    # Group lists by virtual hostname
    mlists = {}
    for listname in Utils.list_names():
        mlist = MailList.MailList(listname, lock=0)
        mlists.setdefault(mlist.host_name, []).append(mlist)
    # Make sure the files are created rw-rw-xxx; it should be okay to be world
    # readable.
    omask = os.umask(002)
    try:
        MTA.clear()
        if not mlists:
            MTA.create(None, nolock=1)
        else:
            for hostname, vlists in mlists.items():
                for mlist in vlists:
                    MTA.create(mlist, nolock=1)
    finally:
        os.umask(omask)
        lock.unlock(unconditionally=1)



if __name__ == '__main__':
    main()