1136 lines
35 KiB
Python
1136 lines
35 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
|
|
|
|
# Copyright 2010 United States Government as represented by the
|
|
# Administrator of the National Aeronautics and Space Administration.
|
|
# Copyright 2011 Justin Santa Barbara
|
|
# All Rights Reserved.
|
|
#
|
|
# Licensed under the Apache License, Version 2.0 (the "License"); you may
|
|
# not use this file except in compliance with the License. You may obtain
|
|
# a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
# License for the specific language governing permissions and limitations
|
|
# under the License.
|
|
|
|
"""Utilities and helper functions."""
|
|
|
|
import contextlib
|
|
import datetime
|
|
import functools
|
|
import inspect
|
|
import os
|
|
import pyclbr
|
|
import random
|
|
import re
|
|
import shutil
|
|
import socket
|
|
import struct
|
|
import sys
|
|
import tempfile
|
|
from xml.sax import saxutils
|
|
|
|
import eventlet
|
|
import netaddr
|
|
from oslo.config import cfg
|
|
|
|
from nova import exception
|
|
from nova.openstack.common import excutils
|
|
from nova.openstack.common import gettextutils
|
|
from nova.openstack.common.gettextutils import _
|
|
from nova.openstack.common import importutils
|
|
from nova.openstack.common import lockutils
|
|
from nova.openstack.common import log as logging
|
|
from nova.openstack.common import processutils
|
|
from nova.openstack.common.rpc import common as rpc_common
|
|
from nova.openstack.common import timeutils
|
|
|
|
notify_decorator = 'nova.notifications.notify_decorator'
|
|
|
|
monkey_patch_opts = [
|
|
cfg.BoolOpt('monkey_patch',
|
|
default=False,
|
|
help='Whether to log monkey patching'),
|
|
cfg.ListOpt('monkey_patch_modules',
|
|
default=[
|
|
'nova.api.ec2.cloud:%s' % (notify_decorator),
|
|
'nova.compute.api:%s' % (notify_decorator)
|
|
],
|
|
help='List of modules/decorators to monkey patch'),
|
|
]
|
|
utils_opts = [
|
|
cfg.IntOpt('password_length',
|
|
default=12,
|
|
help='Length of generated instance admin passwords'),
|
|
cfg.StrOpt('instance_usage_audit_period',
|
|
default='month',
|
|
help='time period to generate instance usages for. '
|
|
'Time period must be hour, day, month or year'),
|
|
cfg.StrOpt('rootwrap_config',
|
|
default="/etc/nova/rootwrap.conf",
|
|
help='Path to the rootwrap configuration file to use for '
|
|
'running commands as root'),
|
|
cfg.StrOpt('tempdir',
|
|
help='Explicitly specify the temporary working directory'),
|
|
]
|
|
CONF = cfg.CONF
|
|
CONF.register_opts(monkey_patch_opts)
|
|
CONF.register_opts(utils_opts)
|
|
CONF.import_opt('network_api_class', 'nova.network')
|
|
|
|
LOG = logging.getLogger(__name__)
|
|
|
|
# Used for looking up extensions of text
|
|
# to their 'multiplied' byte amount
|
|
BYTE_MULTIPLIERS = {
|
|
'': 1,
|
|
't': 1024 ** 4,
|
|
'g': 1024 ** 3,
|
|
'm': 1024 ** 2,
|
|
'k': 1024,
|
|
}
|
|
|
|
# used in limits
|
|
TIME_UNITS = {
|
|
'SECOND': 1,
|
|
'MINUTE': 60,
|
|
'HOUR': 3600,
|
|
'DAY': 84400
|
|
}
|
|
|
|
|
|
_IS_NEUTRON_ATTEMPTED = False
|
|
_IS_NEUTRON = False
|
|
|
|
synchronized = lockutils.synchronized_with_prefix('nova-')
|
|
|
|
SM_IMAGE_PROP_PREFIX = "image_"
|
|
SM_INHERITABLE_KEYS = (
|
|
'min_ram', 'min_disk', 'disk_format', 'container_format',
|
|
)
|
|
|
|
|
|
def vpn_ping(address, port, timeout=0.05, session_id=None):
|
|
"""Sends a vpn negotiation packet and returns the server session.
|
|
|
|
Returns False on a failure. Basic packet structure is below.
|
|
|
|
Client packet (14 bytes)::
|
|
|
|
0 1 8 9 13
|
|
+-+--------+-----+
|
|
|x| cli_id |?????|
|
|
+-+--------+-----+
|
|
x = packet identifier 0x38
|
|
cli_id = 64 bit identifier
|
|
? = unknown, probably flags/padding
|
|
|
|
Server packet (26 bytes)::
|
|
|
|
0 1 8 9 13 14 21 2225
|
|
+-+--------+-----+--------+----+
|
|
|x| srv_id |?????| cli_id |????|
|
|
+-+--------+-----+--------+----+
|
|
x = packet identifier 0x40
|
|
cli_id = 64 bit identifier
|
|
? = unknown, probably flags/padding
|
|
bit 9 was 1 and the rest were 0 in testing
|
|
|
|
"""
|
|
if session_id is None:
|
|
session_id = random.randint(0, 0xffffffffffffffff)
|
|
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
|
|
data = struct.pack('!BQxxxxx', 0x38, session_id)
|
|
sock.sendto(data, (address, port))
|
|
sock.settimeout(timeout)
|
|
try:
|
|
received = sock.recv(2048)
|
|
except socket.timeout:
|
|
return False
|
|
finally:
|
|
sock.close()
|
|
fmt = '!BQxxxxxQxxxx'
|
|
if len(received) != struct.calcsize(fmt):
|
|
LOG.warn(_('Expected to receive %(exp)s bytes, but actually %(act)s') %
|
|
dict(exp=struct.calcsize(fmt), act=len(received)))
|
|
return False
|
|
(identifier, server_sess, client_sess) = struct.unpack(fmt, received)
|
|
if identifier == 0x40 and client_sess == session_id:
|
|
return server_sess
|
|
|
|
|
|
def _get_root_helper():
|
|
return 'sudo nova-rootwrap %s' % CONF.rootwrap_config
|
|
|
|
|
|
def execute(*cmd, **kwargs):
|
|
"""Convenience wrapper around oslo's execute() method."""
|
|
if 'run_as_root' in kwargs and not 'root_helper' in kwargs:
|
|
kwargs['root_helper'] = _get_root_helper()
|
|
return processutils.execute(*cmd, **kwargs)
|
|
|
|
|
|
def trycmd(*args, **kwargs):
|
|
"""Convenience wrapper around oslo's trycmd() method."""
|
|
if 'run_as_root' in kwargs and not 'root_helper' in kwargs:
|
|
kwargs['root_helper'] = _get_root_helper()
|
|
return processutils.trycmd(*args, **kwargs)
|
|
|
|
|
|
def novadir():
|
|
import nova
|
|
return os.path.abspath(nova.__file__).split('nova/__init__.py')[0]
|
|
|
|
|
|
def generate_uid(topic, size=8):
|
|
characters = '01234567890abcdefghijklmnopqrstuvwxyz'
|
|
choices = [random.choice(characters) for _x in xrange(size)]
|
|
return '%s-%s' % (topic, ''.join(choices))
|
|
|
|
|
|
# Default symbols to use for passwords. Avoids visually confusing characters.
|
|
# ~6 bits per symbol
|
|
DEFAULT_PASSWORD_SYMBOLS = ('23456789', # Removed: 0,1
|
|
'ABCDEFGHJKLMNPQRSTUVWXYZ', # Removed: I, O
|
|
'abcdefghijkmnopqrstuvwxyz') # Removed: l
|
|
|
|
|
|
# ~5 bits per symbol
|
|
EASIER_PASSWORD_SYMBOLS = ('23456789', # Removed: 0, 1
|
|
'ABCDEFGHJKLMNPQRSTUVWXYZ') # Removed: I, O
|
|
|
|
|
|
def last_completed_audit_period(unit=None, before=None):
|
|
"""This method gives you the most recently *completed* audit period.
|
|
|
|
arguments:
|
|
units: string, one of 'hour', 'day', 'month', 'year'
|
|
Periods normally begin at the beginning (UTC) of the
|
|
period unit (So a 'day' period begins at midnight UTC,
|
|
a 'month' unit on the 1st, a 'year' on Jan, 1)
|
|
unit string may be appended with an optional offset
|
|
like so: 'day@18' This will begin the period at 18:00
|
|
UTC. 'month@15' starts a monthly period on the 15th,
|
|
and year@3 begins a yearly one on March 1st.
|
|
before: Give the audit period most recently completed before
|
|
<timestamp>. Defaults to now.
|
|
|
|
|
|
returns: 2 tuple of datetimes (begin, end)
|
|
The begin timestamp of this audit period is the same as the
|
|
end of the previous.
|
|
"""
|
|
if not unit:
|
|
unit = CONF.instance_usage_audit_period
|
|
|
|
offset = 0
|
|
if '@' in unit:
|
|
unit, offset = unit.split("@", 1)
|
|
offset = int(offset)
|
|
|
|
if before is not None:
|
|
rightnow = before
|
|
else:
|
|
rightnow = timeutils.utcnow()
|
|
if unit not in ('month', 'day', 'year', 'hour'):
|
|
raise ValueError('Time period must be hour, day, month or year')
|
|
if unit == 'month':
|
|
if offset == 0:
|
|
offset = 1
|
|
end = datetime.datetime(day=offset,
|
|
month=rightnow.month,
|
|
year=rightnow.year)
|
|
if end >= rightnow:
|
|
year = rightnow.year
|
|
if 1 >= rightnow.month:
|
|
year -= 1
|
|
month = 12 + (rightnow.month - 1)
|
|
else:
|
|
month = rightnow.month - 1
|
|
end = datetime.datetime(day=offset,
|
|
month=month,
|
|
year=year)
|
|
year = end.year
|
|
if 1 >= end.month:
|
|
year -= 1
|
|
month = 12 + (end.month - 1)
|
|
else:
|
|
month = end.month - 1
|
|
begin = datetime.datetime(day=offset, month=month, year=year)
|
|
|
|
elif unit == 'year':
|
|
if offset == 0:
|
|
offset = 1
|
|
end = datetime.datetime(day=1, month=offset, year=rightnow.year)
|
|
if end >= rightnow:
|
|
end = datetime.datetime(day=1,
|
|
month=offset,
|
|
year=rightnow.year - 1)
|
|
begin = datetime.datetime(day=1,
|
|
month=offset,
|
|
year=rightnow.year - 2)
|
|
else:
|
|
begin = datetime.datetime(day=1,
|
|
month=offset,
|
|
year=rightnow.year - 1)
|
|
|
|
elif unit == 'day':
|
|
end = datetime.datetime(hour=offset,
|
|
day=rightnow.day,
|
|
month=rightnow.month,
|
|
year=rightnow.year)
|
|
if end >= rightnow:
|
|
end = end - datetime.timedelta(days=1)
|
|
begin = end - datetime.timedelta(days=1)
|
|
|
|
elif unit == 'hour':
|
|
end = rightnow.replace(minute=offset, second=0, microsecond=0)
|
|
if end >= rightnow:
|
|
end = end - datetime.timedelta(hours=1)
|
|
begin = end - datetime.timedelta(hours=1)
|
|
|
|
return (begin, end)
|
|
|
|
|
|
def generate_password(length=None, symbolgroups=DEFAULT_PASSWORD_SYMBOLS):
|
|
"""Generate a random password from the supplied symbol groups.
|
|
|
|
At least one symbol from each group will be included. Unpredictable
|
|
results if length is less than the number of symbol groups.
|
|
|
|
Believed to be reasonably secure (with a reasonable password length!)
|
|
|
|
"""
|
|
if length is None:
|
|
length = CONF.password_length
|
|
|
|
r = random.SystemRandom()
|
|
|
|
# NOTE(jerdfelt): Some password policies require at least one character
|
|
# from each group of symbols, so start off with one random character
|
|
# from each symbol group
|
|
password = [r.choice(s) for s in symbolgroups]
|
|
# If length < len(symbolgroups), the leading characters will only
|
|
# be from the first length groups. Try our best to not be predictable
|
|
# by shuffling and then truncating.
|
|
r.shuffle(password)
|
|
password = password[:length]
|
|
length -= len(password)
|
|
|
|
# then fill with random characters from all symbol groups
|
|
symbols = ''.join(symbolgroups)
|
|
password.extend([r.choice(symbols) for _i in xrange(length)])
|
|
|
|
# finally shuffle to ensure first x characters aren't from a
|
|
# predictable group
|
|
r.shuffle(password)
|
|
|
|
return ''.join(password)
|
|
|
|
|
|
def get_my_ipv4_address():
|
|
"""Run ip route/addr commands to figure out the best ipv4
|
|
"""
|
|
LOCALHOST = '127.0.0.1'
|
|
try:
|
|
out = execute('ip', '-f', 'inet', '-o', 'route', 'show')
|
|
|
|
# Find the default route
|
|
regex_default = ('default\s*via\s*'
|
|
'(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})'
|
|
'\s*dev\s*(\w*)\s*')
|
|
default_routes = re.findall(regex_default, out[0])
|
|
if not default_routes:
|
|
return LOCALHOST
|
|
gateway, iface = default_routes[0]
|
|
|
|
# Find the right subnet for the gateway/interface for
|
|
# the default route
|
|
route = ('(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})\/(\d{1,2})'
|
|
'\s*dev\s*(\w*)\s*')
|
|
for match in re.finditer(route, out[0]):
|
|
subnet = netaddr.IPNetwork(match.group(1) + "/" + match.group(2))
|
|
if (match.group(3) == iface and
|
|
netaddr.IPAddress(gateway) in subnet):
|
|
try:
|
|
return _get_ipv4_address_for_interface(iface)
|
|
except exception.NovaException:
|
|
pass
|
|
except Exception as ex:
|
|
LOG.error(_("Couldn't get IPv4 : %(ex)s") % {'ex': ex})
|
|
return LOCALHOST
|
|
|
|
|
|
def _get_ipv4_address_for_interface(iface):
|
|
"""Run ip addr show for an interface and grab its ipv4 addresses
|
|
"""
|
|
try:
|
|
out = execute('ip', '-f', 'inet', '-o', 'addr', 'show', iface)
|
|
regexp_address = re.compile('inet\s*'
|
|
'(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})')
|
|
address = [m.group(1) for m in regexp_address.finditer(out[0])
|
|
if m.group(1) != '127.0.0.1']
|
|
if address:
|
|
return address[0]
|
|
else:
|
|
msg = _('IPv4 address is not found.: %s') % out[0]
|
|
raise exception.NovaException(msg)
|
|
except Exception as ex:
|
|
msg = _("Couldn't get IPv4 of %(interface)s"
|
|
" : %(ex)s") % {'interface': iface, 'ex': ex}
|
|
LOG.error(msg)
|
|
raise exception.NovaException(msg)
|
|
|
|
|
|
def get_my_linklocal(interface):
|
|
try:
|
|
if_str = execute('ip', '-f', 'inet6', '-o', 'addr', 'show', interface)
|
|
condition = '\s+inet6\s+([0-9a-f:]+)/\d+\s+scope\s+link'
|
|
links = [re.search(condition, x) for x in if_str[0].split('\n')]
|
|
address = [w.group(1) for w in links if w is not None]
|
|
if address[0] is not None:
|
|
return address[0]
|
|
else:
|
|
msg = _('Link Local address is not found.:%s') % if_str
|
|
raise exception.NovaException(msg)
|
|
except Exception as ex:
|
|
msg = _("Couldn't get Link Local IP of %(interface)s"
|
|
" :%(ex)s") % {'interface': interface, 'ex': ex}
|
|
raise exception.NovaException(msg)
|
|
|
|
|
|
class LazyPluggable(object):
|
|
"""A pluggable backend loaded lazily based on some value."""
|
|
|
|
def __init__(self, pivot, config_group=None, **backends):
|
|
self.__backends = backends
|
|
self.__pivot = pivot
|
|
self.__backend = None
|
|
self.__config_group = config_group
|
|
|
|
def __get_backend(self):
|
|
if not self.__backend:
|
|
if self.__config_group is None:
|
|
backend_name = CONF[self.__pivot]
|
|
else:
|
|
backend_name = CONF[self.__config_group][self.__pivot]
|
|
if backend_name not in self.__backends:
|
|
msg = _('Invalid backend: %s') % backend_name
|
|
raise exception.NovaException(msg)
|
|
|
|
backend = self.__backends[backend_name]
|
|
if isinstance(backend, tuple):
|
|
name = backend[0]
|
|
fromlist = backend[1]
|
|
else:
|
|
name = backend
|
|
fromlist = backend
|
|
|
|
self.__backend = __import__(name, None, None, fromlist)
|
|
return self.__backend
|
|
|
|
def __getattr__(self, key):
|
|
backend = self.__get_backend()
|
|
return getattr(backend, key)
|
|
|
|
|
|
def xhtml_escape(value):
|
|
"""Escapes a string so it is valid within XML or XHTML.
|
|
|
|
"""
|
|
return saxutils.escape(value, {'"': '"', "'": '''})
|
|
|
|
|
|
def utf8(value):
|
|
"""Try to turn a string into utf-8 if possible.
|
|
|
|
Code is directly from the utf8 function in
|
|
http://github.com/facebook/tornado/blob/master/tornado/escape.py
|
|
|
|
"""
|
|
if isinstance(value, unicode):
|
|
return value.encode('utf-8')
|
|
elif isinstance(value, gettextutils.Message):
|
|
return unicode(value).encode('utf-8')
|
|
assert isinstance(value, str)
|
|
return value
|
|
|
|
|
|
def diff_dict(orig, new):
|
|
"""
|
|
Return a dict describing how to change orig to new. The keys
|
|
correspond to values that have changed; the value will be a list
|
|
of one or two elements. The first element of the list will be
|
|
either '+' or '-', indicating whether the key was updated or
|
|
deleted; if the key was updated, the list will contain a second
|
|
element, giving the updated value.
|
|
"""
|
|
# Figure out what keys went away
|
|
result = dict((k, ['-']) for k in set(orig.keys()) - set(new.keys()))
|
|
# Compute the updates
|
|
for key, value in new.items():
|
|
if key not in orig or value != orig[key]:
|
|
result[key] = ['+', value]
|
|
return result
|
|
|
|
|
|
def check_isinstance(obj, cls):
|
|
"""Checks that obj is of type cls, and lets PyLint infer types."""
|
|
if isinstance(obj, cls):
|
|
return obj
|
|
raise Exception(_('Expected object of type: %s') % (str(cls)))
|
|
|
|
|
|
def parse_server_string(server_str):
|
|
"""
|
|
Parses the given server_string and returns a list of host and port.
|
|
If it's not a combination of host part and port, the port element
|
|
is a null string. If the input is invalid expression, return a null
|
|
list.
|
|
"""
|
|
try:
|
|
# First of all, exclude pure IPv6 address (w/o port).
|
|
if netaddr.valid_ipv6(server_str):
|
|
return (server_str, '')
|
|
|
|
# Next, check if this is IPv6 address with a port number combination.
|
|
if server_str.find("]:") != -1:
|
|
(address, port) = server_str.replace('[', '', 1).split(']:')
|
|
return (address, port)
|
|
|
|
# Third, check if this is a combination of an address and a port
|
|
if server_str.find(':') == -1:
|
|
return (server_str, '')
|
|
|
|
# This must be a combination of an address and a port
|
|
(address, port) = server_str.split(':')
|
|
return (address, port)
|
|
|
|
except Exception:
|
|
LOG.error(_('Invalid server_string: %s'), server_str)
|
|
return ('', '')
|
|
|
|
|
|
def is_int_like(val):
|
|
"""Check if a value looks like an int."""
|
|
try:
|
|
return str(int(val)) == str(val)
|
|
except Exception:
|
|
return False
|
|
|
|
|
|
def is_valid_ipv4(address):
|
|
"""Verify that address represents a valid IPv4 address."""
|
|
try:
|
|
return netaddr.valid_ipv4(address)
|
|
except Exception:
|
|
return False
|
|
|
|
|
|
def is_valid_ipv6(address):
|
|
try:
|
|
return netaddr.valid_ipv6(address)
|
|
except Exception:
|
|
return False
|
|
|
|
|
|
def is_valid_ipv6_cidr(address):
|
|
try:
|
|
str(netaddr.IPNetwork(address, version=6).cidr)
|
|
return True
|
|
except Exception:
|
|
return False
|
|
|
|
|
|
def get_shortened_ipv6(address):
|
|
addr = netaddr.IPAddress(address, version=6)
|
|
return str(addr.ipv6())
|
|
|
|
|
|
def get_shortened_ipv6_cidr(address):
|
|
net = netaddr.IPNetwork(address, version=6)
|
|
return str(net.cidr)
|
|
|
|
|
|
def is_valid_cidr(address):
|
|
"""Check if address is valid
|
|
|
|
The provided address can be a IPv6 or a IPv4
|
|
CIDR address.
|
|
"""
|
|
try:
|
|
# Validate the correct CIDR Address
|
|
netaddr.IPNetwork(address)
|
|
except netaddr.core.AddrFormatError:
|
|
return False
|
|
except UnboundLocalError:
|
|
# NOTE(MotoKen): work around bug in netaddr 0.7.5 (see detail in
|
|
# https://github.com/drkjam/netaddr/issues/2)
|
|
return False
|
|
|
|
# Prior validation partially verify /xx part
|
|
# Verify it here
|
|
ip_segment = address.split('/')
|
|
|
|
if (len(ip_segment) <= 1 or
|
|
ip_segment[1] == ''):
|
|
return False
|
|
|
|
return True
|
|
|
|
|
|
def get_ip_version(network):
|
|
"""Returns the IP version of a network (IPv4 or IPv6).
|
|
|
|
Raises AddrFormatError if invalid network.
|
|
"""
|
|
if netaddr.IPNetwork(network).version == 6:
|
|
return "IPv6"
|
|
elif netaddr.IPNetwork(network).version == 4:
|
|
return "IPv4"
|
|
|
|
|
|
def monkey_patch():
|
|
"""If the Flags.monkey_patch set as True,
|
|
this function patches a decorator
|
|
for all functions in specified modules.
|
|
You can set decorators for each modules
|
|
using CONF.monkey_patch_modules.
|
|
The format is "Module path:Decorator function".
|
|
Example:
|
|
'nova.api.ec2.cloud:nova.notifications.notify_decorator'
|
|
|
|
Parameters of the decorator is as follows.
|
|
(See nova.notifications.notify_decorator)
|
|
|
|
name - name of the function
|
|
function - object of the function
|
|
"""
|
|
# If CONF.monkey_patch is not True, this function do nothing.
|
|
if not CONF.monkey_patch:
|
|
return
|
|
# Get list of modules and decorators
|
|
for module_and_decorator in CONF.monkey_patch_modules:
|
|
module, decorator_name = module_and_decorator.split(':')
|
|
# import decorator function
|
|
decorator = importutils.import_class(decorator_name)
|
|
__import__(module)
|
|
# Retrieve module information using pyclbr
|
|
module_data = pyclbr.readmodule_ex(module)
|
|
for key in module_data.keys():
|
|
# set the decorator for the class methods
|
|
if isinstance(module_data[key], pyclbr.Class):
|
|
clz = importutils.import_class("%s.%s" % (module, key))
|
|
for method, func in inspect.getmembers(clz, inspect.ismethod):
|
|
setattr(clz, method,
|
|
decorator("%s.%s.%s" % (module, key, method), func))
|
|
# set the decorator for the function
|
|
if isinstance(module_data[key], pyclbr.Function):
|
|
func = importutils.import_class("%s.%s" % (module, key))
|
|
setattr(sys.modules[module], key,
|
|
decorator("%s.%s" % (module, key), func))
|
|
|
|
|
|
def convert_to_list_dict(lst, label):
|
|
"""Convert a value or list into a list of dicts."""
|
|
if not lst:
|
|
return None
|
|
if not isinstance(lst, list):
|
|
lst = [lst]
|
|
return [{label: x} for x in lst]
|
|
|
|
|
|
def make_dev_path(dev, partition=None, base='/dev'):
|
|
"""Return a path to a particular device.
|
|
|
|
>>> make_dev_path('xvdc')
|
|
/dev/xvdc
|
|
|
|
>>> make_dev_path('xvdc', 1)
|
|
/dev/xvdc1
|
|
"""
|
|
path = os.path.join(base, dev)
|
|
if partition:
|
|
path += str(partition)
|
|
return path
|
|
|
|
|
|
def sanitize_hostname(hostname):
|
|
"""Return a hostname which conforms to RFC-952 and RFC-1123 specs."""
|
|
if isinstance(hostname, unicode):
|
|
hostname = hostname.encode('latin-1', 'ignore')
|
|
|
|
hostname = re.sub('[ _]', '-', hostname)
|
|
hostname = re.sub('[^\w.-]+', '', hostname)
|
|
hostname = hostname.lower()
|
|
hostname = hostname.strip('.-')
|
|
|
|
return hostname
|
|
|
|
|
|
def read_cached_file(filename, cache_info, reload_func=None):
|
|
"""Read from a file if it has been modified.
|
|
|
|
:param cache_info: dictionary to hold opaque cache.
|
|
:param reload_func: optional function to be called with data when
|
|
file is reloaded due to a modification.
|
|
|
|
:returns: data from file
|
|
|
|
"""
|
|
mtime = os.path.getmtime(filename)
|
|
if not cache_info or mtime != cache_info.get('mtime'):
|
|
LOG.debug(_("Reloading cached file %s") % filename)
|
|
with open(filename) as fap:
|
|
cache_info['data'] = fap.read()
|
|
cache_info['mtime'] = mtime
|
|
if reload_func:
|
|
reload_func(cache_info['data'])
|
|
return cache_info['data']
|
|
|
|
|
|
@contextlib.contextmanager
|
|
def temporary_mutation(obj, **kwargs):
|
|
"""Temporarily set the attr on a particular object to a given value then
|
|
revert when finished.
|
|
|
|
One use of this is to temporarily set the read_deleted flag on a context
|
|
object:
|
|
|
|
with temporary_mutation(context, read_deleted="yes"):
|
|
do_something_that_needed_deleted_objects()
|
|
"""
|
|
def is_dict_like(thing):
|
|
return hasattr(thing, 'has_key')
|
|
|
|
def get(thing, attr, default):
|
|
if is_dict_like(thing):
|
|
return thing.get(attr, default)
|
|
else:
|
|
return getattr(thing, attr, default)
|
|
|
|
def set_value(thing, attr, val):
|
|
if is_dict_like(thing):
|
|
thing[attr] = val
|
|
else:
|
|
setattr(thing, attr, val)
|
|
|
|
def delete(thing, attr):
|
|
if is_dict_like(thing):
|
|
del thing[attr]
|
|
else:
|
|
delattr(thing, attr)
|
|
|
|
NOT_PRESENT = object()
|
|
|
|
old_values = {}
|
|
for attr, new_value in kwargs.items():
|
|
old_values[attr] = get(obj, attr, NOT_PRESENT)
|
|
set_value(obj, attr, new_value)
|
|
|
|
try:
|
|
yield
|
|
finally:
|
|
for attr, old_value in old_values.items():
|
|
if old_value is NOT_PRESENT:
|
|
delete(obj, attr)
|
|
else:
|
|
set_value(obj, attr, old_value)
|
|
|
|
|
|
def generate_mac_address():
|
|
"""Generate an Ethernet MAC address."""
|
|
# NOTE(vish): We would prefer to use 0xfe here to ensure that linux
|
|
# bridge mac addresses don't change, but it appears to
|
|
# conflict with libvirt, so we use the next highest octet
|
|
# that has the unicast and locally administered bits set
|
|
# properly: 0xfa.
|
|
# Discussion: https://bugs.launchpad.net/nova/+bug/921838
|
|
mac = [0xfa, 0x16, 0x3e,
|
|
random.randint(0x00, 0xff),
|
|
random.randint(0x00, 0xff),
|
|
random.randint(0x00, 0xff)]
|
|
return ':'.join(map(lambda x: "%02x" % x, mac))
|
|
|
|
|
|
def read_file_as_root(file_path):
|
|
"""Secure helper to read file as root."""
|
|
try:
|
|
out, _err = execute('cat', file_path, run_as_root=True)
|
|
return out
|
|
except processutils.ProcessExecutionError:
|
|
raise exception.FileNotFound(file_path=file_path)
|
|
|
|
|
|
@contextlib.contextmanager
|
|
def temporary_chown(path, owner_uid=None):
|
|
"""Temporarily chown a path.
|
|
|
|
:params owner_uid: UID of temporary owner (defaults to current user)
|
|
"""
|
|
if owner_uid is None:
|
|
owner_uid = os.getuid()
|
|
|
|
orig_uid = os.stat(path).st_uid
|
|
|
|
if orig_uid != owner_uid:
|
|
execute('chown', owner_uid, path, run_as_root=True)
|
|
try:
|
|
yield
|
|
finally:
|
|
if orig_uid != owner_uid:
|
|
execute('chown', orig_uid, path, run_as_root=True)
|
|
|
|
|
|
@contextlib.contextmanager
|
|
def tempdir(**kwargs):
|
|
argdict = kwargs.copy()
|
|
if 'dir' not in argdict:
|
|
argdict['dir'] = CONF.tempdir
|
|
tmpdir = tempfile.mkdtemp(**argdict)
|
|
try:
|
|
yield tmpdir
|
|
finally:
|
|
try:
|
|
shutil.rmtree(tmpdir)
|
|
except OSError as e:
|
|
LOG.error(_('Could not remove tmpdir: %s'), str(e))
|
|
|
|
|
|
def walk_class_hierarchy(clazz, encountered=None):
|
|
"""Walk class hierarchy, yielding most derived classes first."""
|
|
if not encountered:
|
|
encountered = []
|
|
for subclass in clazz.__subclasses__():
|
|
if subclass not in encountered:
|
|
encountered.append(subclass)
|
|
# drill down to leaves first
|
|
for subsubclass in walk_class_hierarchy(subclass, encountered):
|
|
yield subsubclass
|
|
yield subclass
|
|
|
|
|
|
class UndoManager(object):
|
|
"""Provides a mechanism to facilitate rolling back a series of actions
|
|
when an exception is raised.
|
|
"""
|
|
def __init__(self):
|
|
self.undo_stack = []
|
|
|
|
def undo_with(self, undo_func):
|
|
self.undo_stack.append(undo_func)
|
|
|
|
def _rollback(self):
|
|
for undo_func in reversed(self.undo_stack):
|
|
undo_func()
|
|
|
|
def rollback_and_reraise(self, msg=None, **kwargs):
|
|
"""Rollback a series of actions then re-raise the exception.
|
|
|
|
.. note:: (sirp) This should only be called within an
|
|
exception handler.
|
|
"""
|
|
with excutils.save_and_reraise_exception():
|
|
if msg:
|
|
LOG.exception(msg, **kwargs)
|
|
|
|
self._rollback()
|
|
|
|
|
|
def mkfs(fs, path, label=None, run_as_root=False):
|
|
"""Format a file or block device
|
|
|
|
:param fs: Filesystem type (examples include 'swap', 'ext3', 'ext4'
|
|
'btrfs', etc.)
|
|
:param path: Path to file or block device to format
|
|
:param label: Volume label to use
|
|
"""
|
|
if fs == 'swap':
|
|
args = ['mkswap']
|
|
else:
|
|
args = ['mkfs', '-t', fs]
|
|
#add -F to force no interactive execute on non-block device.
|
|
if fs in ('ext3', 'ext4', 'ntfs'):
|
|
args.extend(['-F'])
|
|
if label:
|
|
if fs in ('msdos', 'vfat'):
|
|
label_opt = '-n'
|
|
else:
|
|
label_opt = '-L'
|
|
args.extend([label_opt, label])
|
|
args.append(path)
|
|
execute(*args, run_as_root=run_as_root)
|
|
|
|
|
|
def last_bytes(file_like_object, num):
|
|
"""Return num bytes from the end of the file, and remaining byte count.
|
|
|
|
:param file_like_object: The file to read
|
|
:param num: The number of bytes to return
|
|
|
|
:returns (data, remaining)
|
|
"""
|
|
|
|
try:
|
|
file_like_object.seek(-num, os.SEEK_END)
|
|
except IOError as e:
|
|
if e.errno == 22:
|
|
file_like_object.seek(0, os.SEEK_SET)
|
|
else:
|
|
raise
|
|
|
|
remaining = file_like_object.tell()
|
|
return (file_like_object.read(), remaining)
|
|
|
|
|
|
def metadata_to_dict(metadata):
|
|
result = {}
|
|
for item in metadata:
|
|
if not item.get('deleted'):
|
|
result[item['key']] = item['value']
|
|
return result
|
|
|
|
|
|
def dict_to_metadata(metadata):
|
|
result = []
|
|
for key, value in metadata.iteritems():
|
|
result.append(dict(key=key, value=value))
|
|
return result
|
|
|
|
|
|
def instance_meta(instance):
|
|
if isinstance(instance['metadata'], dict):
|
|
return instance['metadata']
|
|
else:
|
|
return metadata_to_dict(instance['metadata'])
|
|
|
|
|
|
def instance_sys_meta(instance):
|
|
if not instance.get('system_metadata'):
|
|
return {}
|
|
if isinstance(instance['system_metadata'], dict):
|
|
return instance['system_metadata']
|
|
else:
|
|
return metadata_to_dict(instance['system_metadata'])
|
|
|
|
|
|
def get_wrapped_function(function):
|
|
"""Get the method at the bottom of a stack of decorators."""
|
|
if not hasattr(function, 'func_closure') or not function.func_closure:
|
|
return function
|
|
|
|
def _get_wrapped_function(function):
|
|
if not hasattr(function, 'func_closure') or not function.func_closure:
|
|
return None
|
|
|
|
for closure in function.func_closure:
|
|
func = closure.cell_contents
|
|
|
|
deeper_func = _get_wrapped_function(func)
|
|
if deeper_func:
|
|
return deeper_func
|
|
elif hasattr(closure.cell_contents, '__call__'):
|
|
return closure.cell_contents
|
|
|
|
return _get_wrapped_function(function)
|
|
|
|
|
|
class ExceptionHelper(object):
|
|
"""Class to wrap another and translate the ClientExceptions raised by its
|
|
function calls to the actual ones.
|
|
"""
|
|
|
|
def __init__(self, target):
|
|
self._target = target
|
|
|
|
def __getattr__(self, name):
|
|
func = getattr(self._target, name)
|
|
|
|
@functools.wraps(func)
|
|
def wrapper(*args, **kwargs):
|
|
try:
|
|
return func(*args, **kwargs)
|
|
except rpc_common.ClientException as e:
|
|
raise (e._exc_info[1], None, e._exc_info[2])
|
|
return wrapper
|
|
|
|
|
|
def check_string_length(value, name, min_length=0, max_length=None):
|
|
"""Check the length of specified string
|
|
:param value: the value of the string
|
|
:param name: the name of the string
|
|
:param min_length: the min_length of the string
|
|
:param max_length: the max_length of the string
|
|
"""
|
|
if not isinstance(value, basestring):
|
|
msg = _("%s is not a string or unicode") % name
|
|
raise exception.InvalidInput(message=msg)
|
|
|
|
if len(value) < min_length:
|
|
msg = _("%(name)s has a minimum character requirement of "
|
|
"%(min_length)s.") % {'name': name, 'min_length': min_length}
|
|
raise exception.InvalidInput(message=msg)
|
|
|
|
if max_length and len(value) > max_length:
|
|
msg = _("%(name)s has more than %(max_length)s "
|
|
"characters.") % {'name': name, 'max_length': max_length}
|
|
raise exception.InvalidInput(message=msg)
|
|
|
|
|
|
def validate_integer(value, name, min_value=None, max_value=None):
|
|
"""Make sure that value is a valid integer, potentially within range."""
|
|
try:
|
|
value = int(str(value))
|
|
except ValueError:
|
|
msg = _('%(value_name)s must be an integer')
|
|
raise exception.InvalidInput(reason=(
|
|
msg % {'value_name': name}))
|
|
|
|
if min_value is not None:
|
|
if value < min_value:
|
|
msg = _('%(value_name)s must be >= %(min_value)d')
|
|
raise exception.InvalidInput(
|
|
reason=(msg % {'value_name': name,
|
|
'min_value': min_value}))
|
|
if max_value is not None:
|
|
if value > max_value:
|
|
msg = _('%(value_name)s must be <= %(max_value)d')
|
|
raise exception.InvalidInput(
|
|
reason=(
|
|
msg % {'value_name': name,
|
|
'max_value': max_value})
|
|
)
|
|
return value
|
|
|
|
|
|
def spawn_n(func, *args, **kwargs):
|
|
"""Passthrough method for eventlet.spawn_n.
|
|
|
|
This utility exists so that it can be stubbed for testing without
|
|
interfering with the service spawns.
|
|
"""
|
|
eventlet.spawn_n(func, *args, **kwargs)
|
|
|
|
|
|
def is_none_string(val):
|
|
"""
|
|
Check if a string represents a None value.
|
|
"""
|
|
if not isinstance(val, basestring):
|
|
return False
|
|
|
|
return val.lower() == 'none'
|
|
|
|
|
|
def convert_version_to_int(version):
|
|
return version[0] * 1000000 + version[1] * 1000 + version[2]
|
|
|
|
|
|
def is_neutron():
|
|
global _IS_NEUTRON_ATTEMPTED
|
|
global _IS_NEUTRON
|
|
|
|
if _IS_NEUTRON_ATTEMPTED:
|
|
return _IS_NEUTRON
|
|
|
|
try:
|
|
# compatibility with Folsom/Grizzly configs
|
|
cls_name = CONF.network_api_class
|
|
if cls_name == 'nova.network.quantumv2.api.API':
|
|
cls_name = 'nova.network.neutronv2.api.API'
|
|
_IS_NEUTRON_ATTEMPTED = True
|
|
|
|
from nova.network.neutronv2 import api as neutron_api
|
|
_IS_NEUTRON = issubclass(importutils.import_class(cls_name),
|
|
neutron_api.API)
|
|
except ImportError:
|
|
_IS_NEUTRON = False
|
|
|
|
return _IS_NEUTRON
|
|
|
|
|
|
def reset_is_neutron():
|
|
global _IS_NEUTRON_ATTEMPTED
|
|
global _IS_NEUTRON
|
|
|
|
_IS_NEUTRON_ATTEMPTED = False
|
|
_IS_NEUTRON = False
|
|
|
|
|
|
def is_auto_disk_config_disabled(auto_disk_config_raw):
|
|
auto_disk_config_disabled = False
|
|
if auto_disk_config_raw is not None:
|
|
adc_lowered = auto_disk_config_raw.strip().lower()
|
|
if adc_lowered == "disabled":
|
|
auto_disk_config_disabled = True
|
|
return auto_disk_config_disabled
|
|
|
|
|
|
def get_auto_disk_config_from_instance(instance=None, sys_meta=None):
|
|
if sys_meta is None:
|
|
sys_meta = instance_sys_meta(instance)
|
|
return sys_meta.get("image_auto_disk_config")
|
|
|
|
|
|
def get_auto_disk_config_from_image_props(image_properties):
|
|
return image_properties.get("auto_disk_config")
|
|
|
|
|
|
def get_system_metadata_from_image(image_meta, instance_type=None):
|
|
system_meta = {}
|
|
prefix_format = SM_IMAGE_PROP_PREFIX + '%s'
|
|
|
|
for key, value in image_meta.get('properties', {}).iteritems():
|
|
new_value = unicode(value)[:255]
|
|
system_meta[prefix_format % key] = new_value
|
|
|
|
for key in SM_INHERITABLE_KEYS:
|
|
value = image_meta.get(key)
|
|
|
|
if key == 'min_disk' and instance_type:
|
|
if image_meta.get('disk_format') == 'vhd':
|
|
value = instance_type['root_gb']
|
|
else:
|
|
value = max(value, instance_type['root_gb'])
|
|
|
|
if value is None:
|
|
continue
|
|
|
|
system_meta[prefix_format % key] = value
|
|
|
|
return system_meta
|
|
|
|
|
|
def get_image_from_system_metadata(system_meta):
|
|
image_meta = {}
|
|
properties = {}
|
|
|
|
if not isinstance(system_meta, dict):
|
|
system_meta = metadata_to_dict(system_meta)
|
|
|
|
for key, value in system_meta.iteritems():
|
|
if value is None:
|
|
continue
|
|
|
|
# NOTE(xqueralt): Not sure this has to inherit all the properties or
|
|
# just the ones we need. Leaving it for now to keep the old behaviour.
|
|
if key.startswith(SM_IMAGE_PROP_PREFIX):
|
|
key = key[len(SM_IMAGE_PROP_PREFIX):]
|
|
|
|
if key in SM_INHERITABLE_KEYS:
|
|
image_meta[key] = value
|
|
else:
|
|
# Skip properties that are non-inheritable
|
|
if key in CONF.non_inheritable_image_properties:
|
|
continue
|
|
properties[key] = value
|
|
|
|
if properties:
|
|
image_meta['properties'] = properties
|
|
|
|
return image_meta
|