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# Copyright 2015 Intel Corporation.
#
# 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.
"""Simple kernel module manager implementation.
"""
import subprocess
import logging
from tools import tasks
class ModuleManager(object):
"""Simple module manager which acts as system wrapper for Kernel Modules.
"""
_logger = logging.getLogger(__name__)
def __init__(self):
"""Initializes data
"""
self._modules = None
def insert_modules(self, modules):
"""Method inserts list of modules. In case that module name ends
with .ko suffix then insmod will be used for its insertion. Otherwise
modprobe will be called.
:returns: None
"""
self._modules = modules
for module in modules:
if ModuleManager.is_module_inserted(module):
continue
try:
if module.endswith('.ko'):
tasks.run_task(['sudo', 'insmod', module], self._logger,
'Insmod module \'%s\'...' % module, True)
else:
tasks.run_task(['sudo', 'modprobe', module], self._logger,
'Modprobe module \'%s\'...' % module, True)
except subprocess.CalledProcessError:
self._logger.error('Unable to insert module \'%s\'.', module)
raise # fail catastrophically
def remove_modules(self):
"""Removes all modules that have been previously instereted.
"""
for module in self._modules:
# first check if module is loaded
if not ModuleManager.is_module_inserted(module):
continue
try:
# rmmod supports both simple module name and full module path
# with .ko suffix
tasks.run_task(['sudo', 'rmmod', module], self._logger,
'Removing module \'%s\'...' % module, True)
except subprocess.CalledProcessError:
self._logger.error('Unable to remove module \'%s\'.', module)
continue
@staticmethod
def is_module_inserted(module):
"""Check if a module is inserted on system.
"""
# get module base name, i.e strip path and .ko suffix if possible
module_base_name = module.split('.')[0].split('/').pop()
# get list of modules from kernel
with open('/proc/modules') as mod_file:
loaded_mods = mod_file.readlines()
# first check if module is loaded
for line in loaded_mods:
if line.startswith(module_base_name):
return True
return False
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