506 lines
14 KiB
Python
506 lines
14 KiB
Python
# Copyright 2010 United States Government as represented by the
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# Administrator of the National Aeronautics and Space Administration.
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# Copyright 2011 Justin Santa Barbara
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# Copyright (c) 2012 NTT DOCOMO, INC.
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""Utilities and helper functions."""
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import contextlib
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import errno
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import hashlib
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import os
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import random
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import re
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import shutil
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import tempfile
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import uuid
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import netaddr
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from oslo.config import cfg
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import paramiko
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import six
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from ironic.common import exception
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from ironic.openstack.common import log as logging
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from ironic.openstack.common import processutils
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utils_opts = [
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cfg.StrOpt('rootwrap_config',
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default="/etc/ironic/rootwrap.conf",
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help='Path to the rootwrap configuration file to use for '
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'running commands as root.'),
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cfg.StrOpt('tempdir',
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help='Explicitly specify the temporary working directory.'),
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]
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CONF = cfg.CONF
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CONF.register_opts(utils_opts)
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LOG = logging.getLogger(__name__)
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def _get_root_helper():
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return 'sudo ironic-rootwrap %s' % CONF.rootwrap_config
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def execute(*cmd, **kwargs):
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"""Convenience wrapper around oslo's execute() method."""
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if kwargs.get('run_as_root') and not 'root_helper' in kwargs:
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kwargs['root_helper'] = _get_root_helper()
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result = processutils.execute(*cmd, **kwargs)
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LOG.debug('Execution completed, command line is "%s"', ' '.join(cmd))
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LOG.debug('Command stdout is: "%s"' % result[0])
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LOG.debug('Command stderr is: "%s"' % result[1])
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return result
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def trycmd(*args, **kwargs):
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"""Convenience wrapper around oslo's trycmd() method."""
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if kwargs.get('run_as_root') and not 'root_helper' in kwargs:
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kwargs['root_helper'] = _get_root_helper()
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return processutils.trycmd(*args, **kwargs)
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def ssh_connect(connection):
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"""Method to connect to a remote system using ssh protocol.
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:param connection: a dict of connection parameters.
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:returns: paramiko.SSHClient -- an active ssh connection.
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:raises: SSHConnectFailed
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"""
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try:
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ssh = paramiko.SSHClient()
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ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
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key_contents = connection.get('key_contents')
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if key_contents:
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data = six.moves.StringIO(key_contents)
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if "BEGIN RSA PRIVATE" in key_contents:
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pkey = paramiko.RSAKey.from_private_key(data)
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elif "BEGIN DSA PRIVATE" in key_contents:
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pkey = paramiko.DSSKey.from_private_key(data)
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else:
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# Can't include the key contents - secure material.
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raise ValueError(_("Invalid private key"))
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else:
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pkey = None
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ssh.connect(connection.get('host'),
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username=connection.get('username'),
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password=connection.get('password'),
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port=connection.get('port', 22),
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pkey=pkey,
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key_filename=connection.get('key_filename'),
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timeout=connection.get('timeout', 10))
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# send TCP keepalive packets every 20 seconds
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ssh.get_transport().set_keepalive(20)
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except Exception as e:
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LOG.debug("SSH connect failed: %s" % e)
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raise exception.SSHConnectFailed(host=connection.get('host'))
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return ssh
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def generate_uid(topic, size=8):
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characters = '01234567890abcdefghijklmnopqrstuvwxyz'
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choices = [random.choice(characters) for _x in range(size)]
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return '%s-%s' % (topic, ''.join(choices))
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def random_alnum(size=32):
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characters = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ'
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return ''.join(random.choice(characters) for _ in range(size))
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class LazyPluggable(object):
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"""A pluggable backend loaded lazily based on some value."""
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def __init__(self, pivot, config_group=None, **backends):
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self.__backends = backends
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self.__pivot = pivot
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self.__backend = None
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self.__config_group = config_group
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def __get_backend(self):
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if not self.__backend:
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if self.__config_group is None:
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backend_name = CONF[self.__pivot]
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else:
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backend_name = CONF[self.__config_group][self.__pivot]
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if backend_name not in self.__backends:
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msg = _('Invalid backend: %s') % backend_name
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raise exception.IronicException(msg)
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backend = self.__backends[backend_name]
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if isinstance(backend, tuple):
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name = backend[0]
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fromlist = backend[1]
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else:
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name = backend
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fromlist = backend
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self.__backend = __import__(name, None, None, fromlist)
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return self.__backend
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def __getattr__(self, key):
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backend = self.__get_backend()
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return getattr(backend, key)
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def delete_if_exists(pathname):
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"""delete a file, but ignore file not found error."""
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try:
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os.unlink(pathname)
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except OSError as e:
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if e.errno == errno.ENOENT:
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return
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else:
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raise
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def is_int_like(val):
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"""Check if a value looks like an int."""
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try:
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return str(int(val)) == str(val)
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except Exception:
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return False
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def is_valid_boolstr(val):
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"""Check if the provided string is a valid bool string or not."""
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boolstrs = ('true', 'false', 'yes', 'no', 'y', 'n', '1', '0')
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return str(val).lower() in boolstrs
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def is_valid_mac(address):
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"""Verify the format of a MAC address.
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Check if a MAC address is valid and contains six octets. Accepts
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colon-separated format only.
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:param address: MAC address to be validated.
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:returns: True if valid. False if not.
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"""
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m = "[0-9a-f]{2}(:[0-9a-f]{2}){5}$"
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if isinstance(address, six.string_types) and re.match(m, address.lower()):
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return True
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return False
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def validate_and_normalize_mac(address):
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"""Validate a MAC address and return normalized form.
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Checks whether the supplied MAC address is formally correct and
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normalize it to all lower case.
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:param address: MAC address to be validated and normalized.
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:returns: Normalized and validated MAC address.
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:raises: InvalidMAC If the MAC address is not valid.
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"""
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if not is_valid_mac(address):
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raise exception.InvalidMAC(mac=address)
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return address.lower()
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def is_valid_ipv4(address):
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"""Verify that address represents a valid IPv4 address."""
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try:
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return netaddr.valid_ipv4(address)
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except Exception:
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return False
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def is_valid_ipv6(address):
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try:
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return netaddr.valid_ipv6(address)
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except Exception:
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return False
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def is_valid_ipv6_cidr(address):
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try:
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str(netaddr.IPNetwork(address, version=6).cidr)
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return True
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except Exception:
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return False
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def get_shortened_ipv6(address):
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addr = netaddr.IPAddress(address, version=6)
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return str(addr.ipv6())
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def get_shortened_ipv6_cidr(address):
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net = netaddr.IPNetwork(address, version=6)
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return str(net.cidr)
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def is_valid_cidr(address):
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"""Check if the provided ipv4 or ipv6 address is a valid CIDR address."""
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try:
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# Validate the correct CIDR Address
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netaddr.IPNetwork(address)
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except netaddr.core.AddrFormatError:
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return False
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except UnboundLocalError:
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# NOTE(MotoKen): work around bug in netaddr 0.7.5 (see detail in
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# https://github.com/drkjam/netaddr/issues/2)
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return False
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# Prior validation partially verify /xx part
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# Verify it here
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ip_segment = address.split('/')
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if (len(ip_segment) <= 1 or
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ip_segment[1] == ''):
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return False
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return True
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def get_ip_version(network):
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"""Returns the IP version of a network (IPv4 or IPv6).
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:raises: AddrFormatError if invalid network.
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"""
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if netaddr.IPNetwork(network).version == 6:
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return "IPv6"
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elif netaddr.IPNetwork(network).version == 4:
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return "IPv4"
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def convert_to_list_dict(lst, label):
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"""Convert a value or list into a list of dicts."""
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if not lst:
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return None
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if not isinstance(lst, list):
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lst = [lst]
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return [{label: x} for x in lst]
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def sanitize_hostname(hostname):
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"""Return a hostname which conforms to RFC-952 and RFC-1123 specs."""
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if isinstance(hostname, six.text_type):
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hostname = hostname.encode('latin-1', 'ignore')
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hostname = re.sub('[ _]', '-', hostname)
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hostname = re.sub('[^\w.-]+', '', hostname)
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hostname = hostname.lower()
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hostname = hostname.strip('.-')
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return hostname
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def read_cached_file(filename, cache_info, reload_func=None):
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"""Read from a file if it has been modified.
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:param cache_info: dictionary to hold opaque cache.
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:param reload_func: optional function to be called with data when
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file is reloaded due to a modification.
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:returns: data from file
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"""
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mtime = os.path.getmtime(filename)
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if not cache_info or mtime != cache_info.get('mtime'):
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LOG.debug("Reloading cached file %s" % filename)
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with open(filename) as fap:
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cache_info['data'] = fap.read()
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cache_info['mtime'] = mtime
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if reload_func:
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reload_func(cache_info['data'])
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return cache_info['data']
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def file_open(*args, **kwargs):
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"""Open file
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see built-in file() documentation for more details
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Note: The reason this is kept in a separate module is to easily
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be able to provide a stub module that doesn't alter system
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state at all (for unit tests)
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"""
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return file(*args, **kwargs)
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def hash_file(file_like_object):
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"""Generate a hash for the contents of a file."""
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checksum = hashlib.sha1()
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for chunk in iter(lambda: file_like_object.read(32768), b''):
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checksum.update(chunk)
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return checksum.hexdigest()
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@contextlib.contextmanager
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def temporary_mutation(obj, **kwargs):
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"""Temporarily set the attr on a particular object to a given value then
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revert when finished.
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One use of this is to temporarily set the read_deleted flag on a context
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object:
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with temporary_mutation(context, read_deleted="yes"):
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do_something_that_needed_deleted_objects()
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"""
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def is_dict_like(thing):
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return hasattr(thing, 'has_key')
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def get(thing, attr, default):
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if is_dict_like(thing):
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return thing.get(attr, default)
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else:
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return getattr(thing, attr, default)
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def set_value(thing, attr, val):
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if is_dict_like(thing):
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thing[attr] = val
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else:
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setattr(thing, attr, val)
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def delete(thing, attr):
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if is_dict_like(thing):
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del thing[attr]
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else:
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delattr(thing, attr)
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NOT_PRESENT = object()
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old_values = {}
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for attr, new_value in kwargs.items():
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old_values[attr] = get(obj, attr, NOT_PRESENT)
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set_value(obj, attr, new_value)
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try:
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yield
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finally:
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for attr, old_value in old_values.items():
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if old_value is NOT_PRESENT:
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delete(obj, attr)
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else:
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set_value(obj, attr, old_value)
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@contextlib.contextmanager
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def tempdir(**kwargs):
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tempfile.tempdir = CONF.tempdir
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tmpdir = tempfile.mkdtemp(**kwargs)
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try:
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yield tmpdir
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finally:
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try:
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shutil.rmtree(tmpdir)
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except OSError as e:
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LOG.error(_('Could not remove tmpdir: %s'), str(e))
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def mkfs(fs, path, label=None):
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"""Format a file or block device
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:param fs: Filesystem type (examples include 'swap', 'ext3', 'ext4'
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'btrfs', etc.)
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:param path: Path to file or block device to format
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:param label: Volume label to use
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"""
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if fs == 'swap':
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args = ['mkswap']
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else:
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args = ['mkfs', '-t', fs]
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#add -F to force no interactive execute on non-block device.
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if fs in ('ext3', 'ext4'):
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args.extend(['-F'])
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if label:
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if fs in ('msdos', 'vfat'):
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label_opt = '-n'
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else:
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label_opt = '-L'
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args.extend([label_opt, label])
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args.append(path)
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execute(*args, run_as_root=True)
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def unlink_without_raise(path):
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try:
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os.unlink(path)
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except OSError as e:
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if e.errno == errno.ENOENT:
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return
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else:
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LOG.warn(_("Failed to unlink %(path)s, error: %(e)s") %
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{'path': path, 'e': e})
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def rmtree_without_raise(path):
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try:
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if os.path.isdir(path):
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shutil.rmtree(path)
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except OSError as e:
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LOG.warn(_("Failed to remove dir %(path)s, error: %(e)s") %
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{'path': path, 'e': e})
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def write_to_file(path, contents):
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with open(path, 'w') as f:
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f.write(contents)
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def create_link_without_raise(source, link):
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try:
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os.symlink(source, link)
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except OSError as e:
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if e.errno == errno.EEXIST:
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return
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else:
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LOG.warn(_("Failed to create symlink from %(source)s to %(link)s"
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", error: %(e)s") %
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{'source': source, 'link': link, 'e': e})
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def safe_rstrip(value, chars=None):
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"""Removes trailing characters from a string if that does not make it empty
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:param value: A string value that will be stripped.
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:param chars: Characters to remove.
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:return: Stripped value.
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"""
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if not isinstance(value, six.string_types):
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LOG.warn(_("Failed to remove trailing character. Returning original "
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"object. Supplied object is not a string: %s,") % value)
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return value
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return value.rstrip(chars) or value
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def generate_uuid():
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return str(uuid.uuid4())
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def is_uuid_like(val):
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"""Returns validation of a value as a UUID.
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For our purposes, a UUID is a canonical form string:
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aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa
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"""
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try:
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return str(uuid.UUID(val)) == val
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except (TypeError, ValueError, AttributeError):
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return False
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