/usr/share/pyshared/metaconfig/__init__.py is in python-metaconfig 0.1.4a1-3.
This file is owned by root:root, with mode 0o644.
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# Copyright (c) 2010, Science & Technology Facilities Council (STFC)
# All rights reserved.
#
# See the LICENSE file in the source distribution of this software for
# the full license text.
"""
State global to the whole package.
"""
import sys, re, os
from configparser import ConfigParser
from metaconfig.mconf import MetaConfig, Error
import logging
log = logging.getLogger(__name__)
_metaconfig = None
def _default_search_path():
search_path = [
'./metaconfig.conf',
os.path.join(os.environ.get('HOME', ''), '.metaconfig.conf'),
os.path.join(sys.prefix, 'etc', 'metaconfig.conf')
]
if 'METACONFIG_CONF' in os.environ:
search_path[0:] = [(os.environ['METACONFIG_CONF'])]
return search_path
def init_from_config(config):
"""
Initialise metaconfig from a :mod:`ConfigParser.ConfigParser` instance.
An exception will be raised if metaconfig has already been initialised.
"""
global _metaconfig
if _metaconfig is not None:
raise Exception("Metaconfig is already initialised")
_metaconfig = MetaConfig.from_config(config)
def init_from_string(config_str):
"""
Initialise metaconfig from a string.
An exception will be raised if metaconfig has already been initialised.
"""
from io import StringIO
mconf = ConfigParser()
mconf.readfp(StringIO(config_str))
init_from_config(mconf)
def init(search_path=None):
"""
Initialise metaconfig.
An exception will be raised if metaconfig has already been initialised.
:param search_path: A sequence of file paths to search for a metaconfig
configuration.
If ``search_path`` is None it defaults to:
1. The value of the ``METACONFIG_CONF`` environment variable if set.
2. ``metaconfig.conf`` in the current directory.
3. ``$HOME/.metaconfig.conf``
4. ``<sys.prefix>/etc/metaconfig.conf``
"""
global _metaconfig
if _metaconfig is not None:
raise Exception("Metaconfig is already initialised")
if search_path is None:
search_path = _default_search_path()
for config in search_path:
if os.path.exists(config):
log.debug('Selected %s as metaconfig.conf' % config)
_metaconfig = MetaConfig.from_config_file(config)
return
else:
_metaconfig = MetaConfig()
def get_config(name, inherit=True):
"""
Returns the :mod:`ConfigParser.ConfigParser` for the given name.
:param name: The name of the config object to return. This is interpreted
as a '.'-separated hierarchical namespace.
:param inherit: If ``True`` and cofig ``name`` does not exist each config
above ``name`` in the hierarchy will be tried before returning an empty
config object. For instance ``get_config("x.y.z")`` would try to
return existing configs ``x.y.z``, ``x.y`` and ``x`` before returning a
new, empty config ``x.y.z``.
"""
if _metaconfig is None:
init()
return _metaconfig.get_config(name, inherit=inherit)
def add_config(name, config_parser):
"""
Add a config_parser object to metaconfig.
"""
if _metaconfig is None:
init()
return _metaconfig.add_config(name, config_parser)
def add_config_file(name, config, ConfigClass=None):
"""
Read a config file and add it to metaconfig.
"""
if _metaconfig is None:
init()
return _metaconfig.add_config_file(name, config, ConfigClass)
def reset():
global _metaconfig
log.warn("Reseting metaconfig. Existing configs will remain.")
_metaconfig = None
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