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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 KernelModuleInsertMode(object):
"""Module manager type of insert definition.
"""
MODPROBE = 1
INSMOD = 2 #NOT IMPLEMENTED
class ModuleManager(object):
"""Simple module manager which acts as system wrapper for Kernel Modules.
"""
_logger = logging.getLogger(__name__)
def __init__(self, insert_mode=KernelModuleInsertMode.MODPROBE):
"""Initializes data and sets insert mode.
:param insert_mode: insert mode defines how modules are going to
be inserted in system.
"""
self._modules = None
self._insert_mode = insert_mode
def insert_modules(self, modules):
"""Method inserts list of modules using defined insert mode.
:param modules: list of modules to be inserted. Each element on
list should represent format which is expected
by KernelModuleInsertMode (e.g. for MODPROBE it
would be module name).
:returns: None
"""
self._modules = modules
for module in modules:
if ModuleManager.is_module_inserted(module):
continue
try:
if self._insert_mode == KernelModuleInsertMode.MODPROBE:
tasks.run_task(['sudo', 'modprobe', module], self._logger,
'Inserting module \'%s\'...' % module, True)
else:
self._logger.error(
"Kernel module insert mode NOT IMPLEMENTED.")
raise
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:
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.
"""
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):
return True
return False
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