Current File : //lib/python3/dist-packages/aptdaemon/utils.py
"""Module with little helper functions and classes:
deprecated - decorator to emit a warning if a depreacted function is used
"""
# Copyright (C) 2008-2009 Sebastian Heinlein <sevel@glatzor.de>
#
# Licensed under the GNU General Public License Version 2
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
__author__ = "Sebastian Heinlein <devel@glatzor.de>"
__all__ = ("deprecated", "IsoCodes")
import os
import sys
import contextlib
import gettext
import functools
import warnings
from xml.etree import ElementTree
if sys.version >= '3':
_gettext_method = "gettext"
else:
_gettext_method = "ugettext"
def deprecated(func):
"""This is a decorator which can be used to mark functions
as deprecated. It will result in a warning being emitted
when the function is used.
Taken from http://wiki.python.org/moin/PythonDecoratorLibrary
#GeneratingDeprecationWarnings
"""
@functools.wraps(func)
def new_func(*args, **kwargs):
warnings.warn_explicit(
"Call to deprecated function %(funcname)s." % {
'funcname': func.__name__,
},
category=DeprecationWarning,
filename=func.__code__.co_filename,
lineno=func.__code__.co_firstlineno + 1
)
return func(*args, **kwargs)
return new_func
@contextlib.contextmanager
def set_euid_egid(uid, gid):
# no need to drop privs
if os.getuid() != 0 and os.getgid() != 0:
yield
return
# temporary drop privs
os.setegid(gid)
old_groups = os.getgroups()
os.setgroups([gid])
os.seteuid(uid)
try:
yield
finally:
os.seteuid(os.getuid())
os.setegid(os.getgid())
os.setgroups(old_groups)
class IsoCodes(object):
"""Provides access to the iso-codes language, script and country
database.
"""
def __init__(self, norm, tag, fallback_tag=None):
filename = "/usr/share/xml/iso-codes/%s.xml" % norm
et = ElementTree.ElementTree(file=filename)
self._dict = {}
self.norm = norm
for element in list(et.iter()):
iso_code = element.get(tag)
if not iso_code and fallback_tag:
iso_code = element.get(fallback_tag)
if iso_code:
self._dict[iso_code] = element.get("name")
def get_localised_name(self, value, locale):
try:
name = self._dict[value]
except KeyError:
return None
trans = gettext.translation(domain=self.norm, fallback=True,
languages=[locale])
return getattr(trans, _gettext_method)(name)
def get_name(self, value):
try:
return self._dict[value]
except KeyError:
return None
def split_package_id(package):
"""Return the name, the version number and the release of the
specified package."""
if "=" in package:
name, version = package.split("=", 1)
release = None
elif "/" in package:
name, release = package.split("/", 1)
version = None
else:
name = package
version = release = None
return name, version, release
# vim:ts=4:sw=4:et
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