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# -*- coding: utf-8 -*-
# Copyright 2014 Red Hat, Inc.
#
# 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.
import glob
import logging
import os
import re
logger = logging.getLogger(__name__)
_SYS_CLASS_NET = '/sys/class/net'
def write_config(filename, data):
with open(filename, 'w') as f:
f.write(str(data))
def get_file_data(filename):
if not os.path.exists(filename):
return ''
try:
with open(filename, 'r') as f:
return f.read()
except IOError:
logger.error("Error reading file: %s" % filename)
return ''
def interface_mac(name):
try:
with open('/sys/class/net/%s/address' % name, 'r') as f:
return f.read().rstrip()
except IOError:
logger.error("Unable to read mac address: %s" % name)
raise
def _is_active_nic(interface_name):
try:
if interface_name == 'lo':
return False
device_dir = _SYS_CLASS_NET + '/%s/device' % interface_name
has_device_dir = os.path.isdir(device_dir)
operstate = None
with open(_SYS_CLASS_NET + '/%s/operstate' % interface_name, 'r') as f:
operstate = f.read().rstrip().lower()
address = None
with open(_SYS_CLASS_NET + '/%s/address' % interface_name, 'r') as f:
address = f.read().rstrip()
if has_device_dir and operstate == 'up' and address:
return True
else:
return False
except IOError:
return False
def _natural_sort_key(s):
nsre = re.compile('([0-9]+)')
return [int(text) if text.isdigit() else text
for text in re.split(nsre, s)]
def ordered_active_nics():
embedded_nics = []
nics = []
logger.debug("Finding active nics")
for name in glob.iglob(_SYS_CLASS_NET + '/*'):
nic = name[(len(_SYS_CLASS_NET) + 1):]
if _is_active_nic(nic):
if nic.startswith('em') or nic.startswith('eth') or \
nic.startswith('eno'):
logger.debug("%s is an embedded active nic" % nic)
embedded_nics.append(nic)
else:
logger.debug("%s is an active nic" % nic)
nics.append(nic)
else:
logger.debug("%s is not an active nic" % nic)
# NOTE: we could just natural sort all active devices,
# but this ensures em, eno, and eth are ordered first
# (more backwards compatible)
active_nics = (sorted(embedded_nics, key=_natural_sort_key) +
sorted(nics, key=_natural_sort_key))
logger.debug("Active nics are %s" % active_nics)
return active_nics
def diff(filename, data):
file_data = get_file_data(filename)
logger.debug("Diff file data:\n%s" % file_data)
logger.debug("Diff data:\n%s" % data)
# convert to string as JSON may have unicode in it
return not file_data == data
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