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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Copyright 2014-2015 Canonical Limited.
#
# 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.
__author__ = "Jorge Niedbalski <jorge.niedbalski@canonical.com>"
from charmhelpers.core.hookenv import (
log,
INFO
)
from subprocess import check_call, check_output
import re
def modprobe(module, persist=True):
"""Load a kernel module and configure for auto-load on reboot."""
cmd = ['modprobe', module]
log('Loading kernel module %s' % module, level=INFO)
check_call(cmd)
if persist:
with open('/etc/modules', 'r+') as modules:
if module not in modules.read():
modules.write(module)
def rmmod(module, force=False):
"""Remove a module from the linux kernel"""
cmd = ['rmmod']
if force:
cmd.append('-f')
cmd.append(module)
log('Removing kernel module %s' % module, level=INFO)
return check_call(cmd)
def lsmod():
"""Shows what kernel modules are currently loaded"""
return check_output(['lsmod'],
universal_newlines=True)
def is_module_loaded(module):
"""Checks if a kernel module is already loaded"""
matches = re.findall('^%s[ ]+' % module, lsmod(), re.M)
return len(matches) > 0
def update_initramfs(version='all'):
"""Updates an initramfs image"""
return check_call(["update-initramfs", "-k", version, "-u"])
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