VirtualMailManager/Config.py
author Pascal Volk <neverseen@users.sourceforge.net>
Wed, 02 Sep 2009 06:08:53 +0000
changeset 138 617f27715b01
parent 136 fb61f64e6351
child 162 0ac9ef587769
permissions -rw-r--r--
Reorganized module import. Dropped the import of constants.VERSION, when it wasn't really needed. Centralized the import of os, re and locale in VirtualMailManager/__init__.py. Also moved w_std() and w_err() from vmm to the __init__.py.
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# -*- coding: UTF-8 -*-
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# Copyright (c) 2007 - 2009, VEB IT
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# See COPYING for distribution information.
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"""Configuration class for read, modify and write the
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configuration from Virtual Mail Manager.
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"""
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from shutil import copy2
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from ConfigParser import ConfigParser, MissingSectionHeaderError, ParsingError
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from cStringIO import StringIO
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from __main__ import ENCODING, ERR, w_std
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from Exceptions import VMMConfigException
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class Config(ConfigParser):
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    """This class is for reading and modifying 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 -- path to the configuration file
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        """
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        ConfigParser.__init__(self)
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        self.__cfgFileName = filename
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        self.__cfgFile = None
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        self.__VMMsections = ['database', 'maildir', 'services', 'domdir',
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                'bin', 'misc', 'config']
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        self.__changes = False
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        self.__missing = {}
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        self.__dbopts = [
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                ['host', 'localhot'],
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                ['user', 'vmm'],
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                ['pass', 'your secret password'],
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                ['name', 'mailsys']
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                ]
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        self.__mdopts = [
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                ['name', 'Maildir'],
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                ['folders', 'Drafts:Sent:Templates:Trash'],
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                ['mode', 448],
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                ['diskusage', 'false'],
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                ['delete', 'false']
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                ]
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        self.__serviceopts = [
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                ['smtp', 'true'],
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                ['pop3', 'true'],
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                ['imap', 'true'],
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                ['sieve', 'true']
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                ]
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        self.__domdopts = [
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                ['base', '/srv/mail'],
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                ['mode', 504],
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                ['delete', 'false']
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                ]
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        self.__binopts = [
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                ['dovecotpw', '/usr/sbin/dovecotpw'],
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                ['du', '/usr/bin/du'],
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                ['postconf', '/usr/sbin/postconf']
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                ]
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        self.__miscopts = [
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                ['passwdscheme', 'PLAIN'],
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                ['gid_mail', 8],
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                ['forcedel', 'false'],
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                ['transport', 'dovecot:'],
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                ['dovecotvers', '11']
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                ]
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    def load(self):
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        """Loads the configuration, read only.
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        Raises a VMMConfigException if the configuration syntax is invalid.
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        """
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        try:
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            self.__cfgFile = file(self.__cfgFileName, 'r')
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            self.readfp(self.__cfgFile)
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        except (MissingSectionHeaderError, ParsingError), e:
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            self.__cfgFile.close()
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            raise VMMConfigException(str(e), ERR.CONF_ERROR)
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        self.__cfgFile.close()
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    def check(self):
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        """Performs a configuration check.
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        Raises a VMMConfigException if the check fails.
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        """
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        if not self.__chkSections():
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            errmsg = StringIO()
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            errmsg.write(_("Using configuration file: %s\n") %\
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                    self.__cfgFileName)
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            for k,v in self.__missing.items():
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                if v[0] is True:
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                    errmsg.write(_(u"missing section: %s\n") % k)
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                else:
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                    errmsg.write(_(u"missing options in section %s:\n") % k)
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                    for o in v:
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                        errmsg.write(" * %s\n" % o)
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            raise VMMConfigException(errmsg.getvalue(), ERR.CONF_ERROR)
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    def getsections(self):
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        """Return a list with all configurable sections."""
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        return self.__VMMsections[:-1]
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    def get(self, section, option, raw=False, vars=None):
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        return unicode(ConfigParser.get(self, section, option, raw, vars),
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                ENCODING, 'replace')
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    def configure(self, sections):
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        """Interactive method for configuring all options in the given sections
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        Arguments:
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        sections -- list of strings with section names
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        """
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        if not isinstance(sections, list):
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            raise TypeError("Argument 'sections' is not a list.")
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        # if [config] done = false (default at 1st run),
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        # then set changes true
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        try:
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            if not self.getboolean('config', 'done'):
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                self.__changes = True
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        except ValueError:
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            self.set('config', 'done', 'False')
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            self.__changes = True
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        w_std(_(u'Using configuration file: %s\n') % self.__cfgFileName)
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        for s in sections:
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            if s != 'config':
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                w_std(_(u'* Config section: “%s”') % s )
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            for opt, val in self.items(s):
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                newval = raw_input(
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                _('Enter new value for option %(opt)s [%(val)s]: ').encode(
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                    ENCODING, 'replace') % {'opt': opt, 'val': val})
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                if newval and newval != val:
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                    self.set(s, opt, newval)
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                    self.__changes = True
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            print
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        if self.__changes:
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            self.__saveChanges()
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    def __saveChanges(self):
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        """Writes changes to the configuration file."""
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        self.set('config', 'done', 'true')
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        copy2(self.__cfgFileName, self.__cfgFileName+'.bak')
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        self.__cfgFile = file(self.__cfgFileName, 'w')
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        self.write(self.__cfgFile)
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        self.__cfgFile.close()
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    def __chkSections(self):
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        """Checks if all configuration sections are existing."""
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        errors = False
0
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        for s in self.__VMMsections:
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            if not self.has_section(s):
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                self.__missing[s] = [True]
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            elif not self.__chkOptions(s):
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                errors = True
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        return not errors
0
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    def __chkOptions(self, section):
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        """Checks if all configuration options in section are existing.
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        Arguments:
0
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        section -- the section to be checked
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        """
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        retval = True
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        missing = []
0
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        if section == 'database':
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            opts = self.__dbopts
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        elif section == 'maildir':
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            opts = self.__mdopts
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        elif section == 'services':
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            opts = self.__serviceopts
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        elif section == 'domdir':
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            opts = self.__domdopts
0
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        elif section == 'bin':
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            opts = self.__binopts
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        elif section == 'misc':
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            opts = self.__miscopts
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        elif section == 'config':
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            opts = [['done', 'false']]
0
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        for o, v in opts:
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            if not self.has_option(section, o):
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                missing.append(o)
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                retval = False
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        if len(missing):
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            self.__missing[section] = missing
0
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        return retval