VirtualMailManager/ext/postconf.py
author Pascal Volk <user@localhost.localdomain.org>
Mon, 03 Sep 2012 22:40:01 +0000
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parent 608 0ed93eb8b364
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child 675 d24f094d1cb5
permissions -rw-r--r--
po: Regenerated vmm.pot
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# -*- coding: UTF-8 -*-
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# Copyright (c) 2008 - 2012, Pascal Volk
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# See COPYING for distribution information.
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"""
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    VirtualMailManager.ext.postconf
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    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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    Wrapper class for Postfix's postconf.
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    Postconf instances can be used to read actual values of configuration
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    parameters or edit the value of a configuration parameter.
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    postconf.read(parameter) -> value
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    postconf.edit(parameter, value)
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"""
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import re
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from subprocess import Popen, PIPE
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from VirtualMailManager.errors import VMMError
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from VirtualMailManager.constants import VMM_ERROR
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_ = lambda msg: msg
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class Postconf(object):
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    """Wrapper class for Postfix's postconf."""
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    __slots__ = ('_bin', '_val')
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    _parameter_re = re.compile(r'^\w+$')
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    _variables_re = re.compile(r'\$\b\w+\b')
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    def __init__(self, postconf_bin):
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        """Creates a new Postconf instance.
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        Argument:
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        `postconf_bin` : str
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          absolute path to the Postfix postconf binary.
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        """
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        self._bin = postconf_bin
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        self._val = ''
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    def edit(self, parameter, value):
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        """Set the `parameter`'s value to `value`.
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        Arguments:
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        `parameter` : str
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          the name of a Postfix configuration parameter
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        `value` : str
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          the parameter's new value.
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        """
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        self._check_parameter(parameter)
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        stderr = Popen((self._bin, '-e', parameter + '=' + str(value)),
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                       stderr=PIPE).communicate()[1]
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        if stderr:
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            raise VMMError(stderr.strip(), VMM_ERROR)
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    def read(self, parameter, expand_vars=True):
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        """Returns the parameters value.
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        If expand_vars is True (default), all variables in the value will be
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        expanded:
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        e.g. mydestination: mail.example.com, localhost.example.com, localhost
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        Otherwise the value may contain one or more variables.
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        e.g. mydestination: $myhostname, localhost.$mydomain, localhost
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        Arguments:
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        `parameter` : str
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          the name of a Postfix configuration parameter.
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        `expand_vars` : bool
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          indicates if variables should be expanded or not, default True
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        """
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        self._check_parameter(parameter)
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        self._val = self._read(parameter)
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        if expand_vars:
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            self._expand_vars()
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        return self._val
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    def _check_parameter(self, parameter):
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        """Check that the `parameter` looks like a configuration parameter.
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        If not, a VMMError will be raised."""
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        if not self.__class__._parameter_re.match(parameter):
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            raise VMMError(_(u"The value '%s' does not look like a valid "
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                             u"Postfix configuration parameter name.") %
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                           parameter, VMM_ERROR)
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    def _expand_vars(self):
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        """Expand the $variables in self._val to their values."""
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        while True:
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            pvars = set(self.__class__._variables_re.findall(self._val))
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            if not pvars:
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                break
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            if len(pvars) > 1:
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                self._expand_multi_vars(self._read_multi(pvars))
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                continue
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            pvars = pvars.pop()
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            self._val = self._val.replace(pvars, self._read(pvars[1:]))
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    def _expand_multi_vars(self, old_new):
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        """Replace all $vars in self._val with their values."""
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        for old, new in old_new.iteritems():
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            self._val = self._val.replace('$' + old, new)
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    def _read(self, parameter):
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        """Ask postconf for the value of a single configuration parameter."""
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        stdout, stderr = Popen([self._bin, '-h', parameter], stdout=PIPE,
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                               stderr=PIPE).communicate()
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        if stderr:
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            raise VMMError(stderr.strip(), VMM_ERROR)
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        return stdout.strip()
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    def _read_multi(self, parameters):
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        """Ask postconf for multiple configuration parameters. Returns a dict
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        parameter: value items."""
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        cmd = [self._bin]
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        cmd.extend(parameter[1:] for parameter in parameters)
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        stdout, stderr = Popen(cmd, stdout=PIPE, stderr=PIPE).communicate()
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        if stderr:
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            raise VMMError(stderr.strip(), VMM_ERROR)
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        par_val = {}
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        for line in stdout.splitlines():
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            par, val = line.split(' = ')
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            par_val[par] = val
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        return par_val
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del _