VirtualMailManager/Config.py
author Pascal Volk <neverseen@users.sourceforge.net>
Sat, 27 Feb 2010 20:58:49 +0000
branchv0.6.x
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child 229 0fb2f12648a7
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# -*- coding: UTF-8 -*-
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# Copyright (c) 2007 - 2010, Pascal Volk
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# See COPYING for distribution information.
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"""
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    VirtualMailManager.Config
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    VMM's configuration module for simplified configuration access.
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"""
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from ConfigParser import \
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     Error, MissingSectionHeaderError, NoOptionError, NoSectionError, \
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     ParsingError, RawConfigParser
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from cStringIO import StringIO# TODO: move interactive stff to cli
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from VirtualMailManager import exec_ok, get_unicode, is_dir
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from VirtualMailManager.constants.ERROR import CONF_ERROR
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from VirtualMailManager.errors import ConfigError
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_ = lambda msg: msg
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class BadOptionError(Error):
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    """Raised when a option isn't in the format 'section.option'."""
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    pass
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class ConfigValueError(Error):
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    """Raised when creating or validating of new values fails."""
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    pass
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class NoDefaultError(Error):
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    """Raised when the requested option has no default value."""
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    def __init__(self, section, option):
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        Error.__init__(self, 'Option %r in section %r has no default value' %
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                             (option, section))
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class LazyConfig(RawConfigParser):
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    """The **lazy** derivate of the `RawConfigParser`.
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    There are two additional getters:
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    `pget()`
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      The polymorphic getter, which returns a option's value with the
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      appropriate type.
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    `dget()`
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      Like `LazyConfig.pget()`, but returns the option's default, from
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      `LazyConfig._cfg['sectionname']['optionname'].default`, if the
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      option is not configured in a ini-like configuration file.
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    `set()` differs from `RawConfigParser`'s `set()` method. `set()`
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    takes the `section` and `option` arguments combined to a single
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    string in the form "section.option".
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    """
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    def __init__(self):
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        RawConfigParser.__init__(self)
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        self._modified = False
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        # sample _cfg dict.  Create your own in your derived class.
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        self._cfg = {
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            'sectionname': {
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                'optionname': LazyConfigOption(int, 1, self.getint),
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            }
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        }
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    def bool_new(self, value):
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        """Converts the string `value` into a `bool` and returns it.
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        | '1', 'on', 'yes' and 'true' will become `True`
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        | '0', 'off', 'no' and 'false' will become `False`
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        Throws a `ConfigValueError` for all other values, except bools.
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        """
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        if isinstance(value, bool):
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            return value
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        if value.lower() in self._boolean_states:
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            return self._boolean_states[value.lower()]
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        else:
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            raise ConfigValueError(_(u"Not a boolean: '%s'") %
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                                   get_unicode(value))
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    def getboolean(self, section, option):
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        """Returns the boolean value of the option, in the given
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        section.
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        For a boolean True, the value must be set to '1', 'on', 'yes',
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        'true' or True. For a boolean False, the value must set to '0',
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        'off', 'no', 'false' or False.
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        If the option has another value assigned this method will raise
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        a ValueError.
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        """
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        # if the setting was modified it may be still a boolean value lets see
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        tmp = self.get(section, option)
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        if isinstance(tmp, bool):
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            return tmp
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        if not tmp.lower() in self._boolean_states:
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            raise ValueError('Not a boolean: %s' % tmp)
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        return self._boolean_states[tmp.lower()]
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    def _get_section_option(self, section_option):
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        """splits ``section_option`` (section.option) in two parts and
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        returns them as list ``[section, option]``, if:
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          * it likes the format of ``section_option``
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          * the ``section`` is known
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          * the ``option`` is known
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        Else one of the following exceptions will be thrown:
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          * `BadOptionError`
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          * `NoSectionError`
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          * `NoOptionError`
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        """
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        sect_opt = section_option.lower().split('.')
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        # TODO: cache it
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        if len(sect_opt) != 2:# do we need a regexp to check the format?
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            raise BadOptionError(
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                        _(u"Bad format: '%s' - expected: section.option") %
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                                 get_unicode(section_option))
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        if not sect_opt[0] in self._cfg:
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            raise NoSectionError(sect_opt[0])
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        if not sect_opt[1] in self._cfg[sect_opt[0]]:
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            raise NoOptionError(sect_opt[1], sect_opt[0])
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        return sect_opt
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    def items(self, section):
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        """returns an iterable that returns key, value ``tuples`` from
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        the given ``section``.
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        """
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        if section in self._sections:# check if the section was parsed
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            sect = self._sections[section]
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        elif not section in self._cfg:
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            raise NoSectionError(section)
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        else:
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            return ((k, self._cfg[section][k].default) \
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                    for k in self._cfg[section].iterkeys())
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        # still here? Get defaults and merge defaults with configured setting
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        defaults = dict((k, self._cfg[section][k].default) \
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                        for k in self._cfg[section].iterkeys())
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        defaults.update(sect)
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        if '__name__' in defaults:
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            del defaults['__name__']
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        return defaults.iteritems()
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    def dget(self, option):
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        """Returns the value of the `option`.
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        If the option could not be found in the configuration file, the
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        configured default value, from ``LazyConfig._cfg`` will be
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        returned.
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        Arguments:
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        `option` : string
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            the configuration option in the form "section.option"
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        Throws a `NoDefaultError`, if no default value was passed to
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        `LazyConfigOption.__init__()` for the `option`.
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        """
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        section, option = self._get_section_option(option)
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        try:
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            return self._cfg[section][option].getter(section, option)
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        except (NoSectionError, NoOptionError):
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            if not self._cfg[section][option].default is None:# may be False
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                return self._cfg[section][option].default
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            else:
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                raise NoDefaultError(section, option)
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    def pget(self, option):
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        """Returns the value of the `option`."""
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        section, option = self._get_section_option(option)
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        return self._cfg[section][option].getter(section, option)
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    def set(self, option, value):
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        """Set the `value` of the `option`.
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        Throws a `ValueError` if `value` couldn't be converted using
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        `LazyConfigOption.cls`.
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        """
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        # pylint: disable-msg=W0221
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        # @pylint: _L A Z Y_
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        section, option = self._get_section_option(option)
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        val = self._cfg[section][option].cls(value)
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        if self._cfg[section][option].validate:
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            val = self._cfg[section][option].validate(val)
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        if not RawConfigParser.has_section(self, section):
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            self.add_section(section)
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        RawConfigParser.set(self, section, option, val)
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        self._modified = True
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    def has_section(self, section):
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        """Checks if `section` is a known configuration section."""
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        return section.lower() in self._cfg
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    def has_option(self, option):
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        """Checks if the option (section.option) is a known
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        configuration option.
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        """
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        # pylint: disable-msg=W0221
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        # @pylint: _L A Z Y_
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        try:
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            self._get_section_option(option)
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            return True
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        except(BadOptionError, NoSectionError, NoOptionError):
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            return False
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    def sections(self):
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        """Returns an iterator object for all configuration sections."""
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        return self._cfg.iterkeys()
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class LazyConfigOption(object):
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    """A simple container class for configuration settings.
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    `LazyConfigOption` instances are required by `LazyConfig` instances,
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    and instances of classes derived from `LazyConfig`, like the
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    `Config` class.
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    """
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    __slots__ = ('__cls', '__default', '__getter', '__validate')
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    def __init__(self, cls, default, getter, validate=None):
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        """Creates a new `LazyConfigOption` instance.
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        Arguments:
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        `cls` : type
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          The class/type of the option's value
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        `default`
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          Default value of the option. Use ``None`` if the option should
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          not have a default value.
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        `getter` : callable
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          A method's name of `RawConfigParser` and derived classes, to
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          get a option's value, e.g. `self.getint`.
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        `validate` : NoneType or a callable
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          None or any method, that takes one argument, in order to
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          check the value, when `LazyConfig.set()` is called.
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        """
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        self.__cls = cls
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        if not default is None:# enforce the type of the default value
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            self.__default = self.__cls(default)
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        else:
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            self.__default = default
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        if not callable(getter):
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            raise TypeError('getter has to be a callable, got a %r' %
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                            getter.__class__.__name__)
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        self.__getter = getter
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        if validate and not callable(validate):
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            raise TypeError('validate has to be callable or None, got a %r' %
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                            validate.__class__.__name__)
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        self.__validate = validate
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    @property
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    def cls(self):
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        """The class of the option's value e.g. `str`, `unicode` or
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        `bool`.
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        """
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        return self.__cls
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    @property
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    def default(self):
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        """The option's default value, may be `None`"""
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        return self.__default
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    @property
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    def getter(self):
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        """The getter method or function to get the option's value"""
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        return self.__getter
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    @property
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    def validate(self):
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        """A method or function to validate the value"""
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        return self.__validate
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class Config(LazyConfig):
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    """This class is for reading vmm's configuration file."""
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    def __init__(self, filename):
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        """Creates a new Config instance
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        Arguments:
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        `filename` : str
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          path to the configuration file
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0
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        """
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        LazyConfig.__init__(self)
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        self._cfg_filename = filename
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        self._cfg_file = None
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        self.__missing = {}
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   306
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        LCO = LazyConfigOption
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        bool_t = self.bool_new
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        self._cfg = {
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            'account': {
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                'delete_directory': LCO(bool_t, False, self.getboolean),
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                'directory_mode': LCO(int, 448, self.getint),
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                'disk_usage': LCO(bool_t, False, self.getboolean),
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                'password_length': LCO(int, 8, self.getint),
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                'random_password': LCO(bool_t, False, self.getboolean),
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                'imap': LCO(bool_t, True, self.getboolean),
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                'pop3': LCO(bool_t, True, self.getboolean),
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                'sieve': LCO(bool_t, True, self.getboolean),
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                'smtp': LCO(bool_t, True, self.getboolean),
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   320
            },
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   321
            'bin': {
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                'dovecotpw': LCO(str, '/usr/sbin/dovecotpw', self.get,
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                                 exec_ok),
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                'du': LCO(str, '/usr/bin/du', self.get, exec_ok),
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                'postconf': LCO(str, '/usr/sbin/postconf', self.get, exec_ok),
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   326
            },
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            'database': {
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                'host': LCO(str, 'localhost', self.get),
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                'name': LCO(str, 'mailsys', self.get),
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                'pass': LCO(str, None, self.get),
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                'user': LCO(str, None, self.get),
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   332
            },
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   333
            'domain': {
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   334
                'auto_postmaster': LCO(bool_t, True, self.getboolean),
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   335
                'delete_directory': LCO(bool_t, False, self.getboolean),
215
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                'directory_mode': LCO(int, 504, self.getint),
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   337
                'force_deletion': LCO(bool_t, False, self.getboolean),
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   338
            },
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   339
            'maildir': {
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   340
                'folders': LCO(str, 'Drafts:Sent:Templates:Trash', self.get),
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                'name': LCO(str, 'Maildir', self.get),
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   342
            },
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   343
            'misc': {
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                'base_directory': LCO(str, '/srv/mail', self.get, is_dir),
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                'dovecot_version': LCO(int, 12, self.getint),
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                'gid_mail': LCO(int, 8, self.getint),
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                'password_scheme': LCO(str, 'CRAM-MD5', self.get,
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                                       self.known_scheme),
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                'transport': LCO(str, 'dovecot:', self.get),
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   350
            },
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   351
        }
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    def load(self):
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        """Loads the configuration, read only.
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   355
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   356
        Raises a ConfigError if the configuration syntax is
215
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   357
        invalid.
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   358
120
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   359
        """
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        try:
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   361
            self._cfg_file = open(self._cfg_filename, 'r')
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            self.readfp(self._cfg_file)
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        except (MissingSectionHeaderError, ParsingError), err:
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   364
            raise ConfigError(str(err), CONF_ERROR)
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   365
        finally:
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   366
            if self._cfg_file and not self._cfg_file.closed:
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   367
                self._cfg_file.close()
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   368
2
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   369
    def check(self):
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   370
        """Performs a configuration check.
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diff changeset
   371
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        Raises a ConfigError if the check fails.
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   373
120
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   374
        """
185
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   375
        # TODO: There are only two settings w/o defaults.
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   376
        #       So there is no need for cStringIO
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   377
        if not self.__chk_cfg():
2
9b39f828aa8a * 'VirtualMailManager/Exceptions.py'
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   378
            errmsg = StringIO()
174
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   379
            errmsg.write(_(u'Missing options, which have no default value.\n'))
187
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   380
            errmsg.write(_(u'Using configuration file: %s\n') %
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diff changeset
   381
                         self._cfg_filename)
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diff changeset
   382
            for section, options in self.__missing.iteritems():
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   383
                errmsg.write(_(u'* Section: %s\n') % section)
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diff changeset
   384
                for option in options:
974bafa59330 VMM/Config: reworked configuration handling.
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   385
                    errmsg.write((u'    %s\n') % option)
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0c8c053b451c Moved VirtualMailManager/Exceptions to VirtualMailManager/errors.
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diff changeset
   386
            raise ConfigError(errmsg.getvalue(), CONF_ERROR)
2
9b39f828aa8a * 'VirtualMailManager/Exceptions.py'
Pascal Volk <neverseen@users.sourceforge.net>
parents: 0
diff changeset
   387
174
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diff changeset
   388
    def known_scheme(self, scheme):
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c705a9e38962 VMM{/Config}: reduced docstrings. Added doc to the repository.
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diff changeset
   389
        """Converts `scheme` to upper case and checks if is known by
174
974bafa59330 VMM/Config: reworked configuration handling.
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   390
        Dovecot (listed in VirtualMailManager.SCHEMES).
185
6e1ef32fbd82 VMM/*: Moved some methods from classes to modules __init__.
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parents: 180
diff changeset
   391
174
974bafa59330 VMM/Config: reworked configuration handling.
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diff changeset
   392
        Throws a `ConfigValueError` if the scheme is not listed in
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   393
        VirtualMailManager.SCHEMES.
215
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diff changeset
   394
174
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diff changeset
   395
        """
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diff changeset
   396
        scheme = scheme.upper()
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diff changeset
   397
        # TODO: VMM.SCHEMES
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diff changeset
   398
974bafa59330 VMM/Config: reworked configuration handling.
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diff changeset
   399
    def unicode(self, section, option):
215
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diff changeset
   400
        """Returns the value of the `option` from `section`, converted
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diff changeset
   401
        to Unicode.
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diff changeset
   402
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diff changeset
   403
        """
174
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diff changeset
   404
        return get_unicode(self.get(section, option))
69
0c124160a991 * 'VirtualMailManager/VirtualMailManager.py'
Pascal Volk <neverseen@users.sourceforge.net>
parents: 68
diff changeset
   405
215
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diff changeset
   406
    def __chk_cfg(self):
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   407
        """Checks all section's options for settings w/o a default
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diff changeset
   408
        value.
185
6e1ef32fbd82 VMM/*: Moved some methods from classes to modules __init__.
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diff changeset
   409
215
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diff changeset
   410
        Returns `True` if everything is fine, else `False`.
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diff changeset
   411
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diff changeset
   412
        """
2
9b39f828aa8a * 'VirtualMailManager/Exceptions.py'
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diff changeset
   413
        errors = False
174
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diff changeset
   414
        for section in self._cfg.iterkeys():
974bafa59330 VMM/Config: reworked configuration handling.
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diff changeset
   415
            missing = []
974bafa59330 VMM/Config: reworked configuration handling.
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diff changeset
   416
            for option, value in self._cfg[section].iteritems():
187
38b9a9859749 VMM/{,cli/Cli}Config: Moved interactive stuff to new CliConfig class.
Pascal Volk <neverseen@users.sourceforge.net>
parents: 185
diff changeset
   417
                if (value.default is None and
38b9a9859749 VMM/{,cli/Cli}Config: Moved interactive stuff to new CliConfig class.
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diff changeset
   418
                    not RawConfigParser.has_option(self, section, option)):
215
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diff changeset
   419
                    missing.append(option)
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diff changeset
   420
                    errors = True
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983cf98d5881 VMM/Config: attributes of class LazyConfigOption are read-only now.
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diff changeset
   421
            if missing:
174
974bafa59330 VMM/Config: reworked configuration handling.
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diff changeset
   422
                self.__missing[section] = missing
2
9b39f828aa8a * 'VirtualMailManager/Exceptions.py'
Pascal Volk <neverseen@users.sourceforge.net>
parents: 0
diff changeset
   423
        return not errors
215
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diff changeset
   424
33f727efa7c4 PEP-8-ified the work of the last days.
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diff changeset
   425
33f727efa7c4 PEP-8-ified the work of the last days.
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diff changeset
   426
del _