#!/usr/bin/python
# Copyright (C) 2013,2015  Codethink Limited
#
# 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; version 2 of the License.
#
# 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, see <http://www.gnu.org/licenses/>.
#
# =*= License: GPL-2 =*=


import os
import sys


def asciibetical(strings):

    def key(s):
        return [ord(c) for c in s]

    return sorted(strings, key=key)


fstab_filename = os.path.join(sys.argv[1], 'etc', 'fstab')

fstab_vars = asciibetical(x for x in os.environ if x.startswith('FSTAB_'))
with open(fstab_filename, 'a') as f:
     for var in fstab_vars:
         f.write('%s\n' % os.environ[var])

os.chown(fstab_filename, 0, 0)
os.chmod(fstab_filename, 0644)