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# Copyright 2015-2016 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 os
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 = []
def insert_module(self, module, auto_remove=True):
"""Method inserts given module.
In case that module name ends with .ko suffix then insmod will
be used for its insertion. Otherwise modprobe will be called.
:param module: a name of kernel module
:param auto_remove: if True (by default), then module will be
automatically removed by remove_modules() method
"""
module_base_name = os.path.basename(os.path.splitext(module)[0])
if self.is_module_inserted(module):
self._logger.info('Module already loaded \'%s\'.', module_base_name)
# add it to internal list, so we can try to remove it at the end
if auto_remove:
self._modules.append(module)
return
try:
if module.endswith('.ko'):
# load module dependecies first, but suppress automatic
# module removal at the end; Just for case, that module
# depends on generic module
for depmod in self.get_module_dependecies(module):
self.insert_module(depmod, auto_remove=False)
tasks.run_task(['sudo', 'insmod', module], self._logger,
'Insmod module \'%s\'...' % module_base_name, True)
else:
tasks.run_task(['sudo', 'modprobe', module], self._logger,
'Modprobe module \'%s\'...' % module_base_name, True)
if auto_remove:
self._modules.append(module)
except subprocess.CalledProcessError:
# in case of error, show full module name
self._logger.error('Unable to insert module \'%s\'.', module)
raise # fail catastrophically
def insert_modules(self, modules):
"""Method inserts list of modules.
:param modules: a list of modules to be inserted
"""
for module in modules:
self.insert_module(module)
def remove_module(self, module):
"""Removes a single module.
:param module: a name of kernel module
"""
if self.is_module_inserted(module):
# get module base name, i.e strip path and .ko suffix if possible
module_base_name = os.path.basename(os.path.splitext(module)[0])
try:
self._logger.info('Removing module \'%s\'...', module_base_name)
subprocess.check_call('sudo rmmod {}'.format(module_base_name),
shell=True, stderr=subprocess.DEVNULL)
# in case that module was loaded automatically by modprobe
# to solve dependecies, then it is not in internal list of modules
if module in self._modules:
self._modules.remove(module)
except subprocess.CalledProcessError:
# in case of error, show full module name...
self._logger.info('Unable to remove module \'%s\'.', module)
# ...and list of dependend modules, if there are any
module_details = self.get_module_details(module_base_name)
if module_details:
mod_dep = module_details.split(' ')[3].rstrip(',')
if mod_dep[0] != '-':
self._logger.debug('Module \'%s\' is used by module(s) \'%s\'.',
module_base_name, mod_dep)
def remove_modules(self):
"""Removes all modules that have been previously inserted.
"""
# remove modules in reverse order to respect their dependencies
for module in reversed(self._modules):
self.remove_module(module)
def is_module_inserted(self, module):
"""Check if a module is inserted on system.
:param module: a name of kernel module
"""
module_base_name = os.path.basename(os.path.splitext(module)[0])
return self.get_module_details(module_base_name) != None
@staticmethod
def get_module_details(module):
"""Return details about given module
:param module: a name of kernel module
:returns: In case that module is loaded in OS, then corresponding
line from /proc/modules will be returned. Otherwise it returns None.
"""
# get list of modules from kernel
with open('/proc/modules') as mod_file:
loaded_mods = mod_file.readlines()
# check if module is loaded
for line in loaded_mods:
# underscores '_' and dashes '-' in module names are interchangeable, so we
# have to normalize module names before comparision
if line.split(' ')[0].replace('-', '_') == module.replace('-', '_'):
return line
return None
@staticmethod
def get_module_dependecies(module):
"""Return list of modules, which must be loaded before module itself
:param module: a name of kernel module
:returns: In case that module has any dependencies, then list of module
names will be returned. Otherwise it returns empty list, i.e. [].
"""
deps = ''
try:
# get list of module dependecies from kernel
deps = subprocess.check_output('modinfo -F depends {}'.format(module),
shell=True).decode().rstrip('\n')
except subprocess.CalledProcessError:
# in case of error, show full module name...
self._logger.info('Unable to get list of dependecies for module \'%s\'.', module)
# ...and try to continue, just for case that dependecies are already loaded
if len(deps):
return deps.split(',')
else:
return []
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