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# -*- coding: utf-8 -*-
"""
config.py
~~~~~~~~~
This module implements a Python object to handle the configuration
of g-octave.
:copyright: (c) 2009-2010 by Rafael Goncalves Martins
:license: GPL-2, see LICENSE for more details.
"""
from __future__ import absolute_import
__all__ = ['Config']
import json
import os
from .compat import py3k, open
from .exception import ConfigException
if py3k:
import configparser
else:
import ConfigParser as configparser
class Config(object):
_defaults = {
'db': '/var/cache/g-octave',
'overlay': '/var/lib/g-octave',
'categories': 'main,extra,language',
'db_mirror': 'github://rafaelmartins/g-octave-db',
'trac_user': '',
'trac_passwd': '',
'log_level': '',
'log_file': '/var/log/g-octave.log',
'package_manager': 'portage',
'use_scm': 'false',
}
_section_name = 'main'
_env_namespace = 'GOCTAVE_'
def __init__(self, fetch_phase=False, config_file=None, create_dirs=True):
# Config Parser
self._config = configparser.ConfigParser(self._defaults)
self._fetch_phase = fetch_phase
parsed_files = self._config.read([
os.path.join(
os.path.dirname(os.path.abspath(__file__)),
'..', 'etc', 'g-octave.cfg'
),
config_file or '/etc/g-octave.cfg',
])
if len(parsed_files) == 0:
raise ConfigException('Configuration file not found.')
_db = self._getattr('db')
_overlay = self._getattr('overlay')
for dir in [_db, _overlay]:
if not os.path.exists(dir) and create_dirs:
try:
os.makedirs(dir, 0o755)
except:
# it's probably safe to ignore that
pass
self._cache = {}
self._info = {}
if not fetch_phase:
# JSON
json_file = os.path.join(_db, 'info.json')
with open(json_file) as fp:
self._info = json.load(fp)
def __getattr__(self, attr):
if attr in self._defaults:
return self._getattr(attr)
elif attr in self._info:
return self._info[attr]
else:
raise ConfigException('Invalid option: %s' % attr)
def _getattr(self, attr):
from_env = os.environ.get(self._env_namespace + attr.upper(), None)
if from_env is None:
return self._config.get(self._section_name, attr)
return from_env
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