67 lines
1.9 KiB
Python
67 lines
1.9 KiB
Python
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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# Copyright 2014-2015 Canonical Limited.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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__author__ = "Jorge Niedbalski <jorge.niedbalski@canonical.com>"
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from charmhelpers.core.hookenv import (
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log,
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INFO
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)
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from subprocess import check_call, check_output
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import re
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def modprobe(module, persist=True):
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"""Load a kernel module and configure for auto-load on reboot."""
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cmd = ['modprobe', module]
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log('Loading kernel module %s' % module, level=INFO)
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check_call(cmd)
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if persist:
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with open('/etc/modules', 'r+') as modules:
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if module not in modules.read():
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modules.write(module)
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def rmmod(module, force=False):
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"""Remove a module from the linux kernel"""
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cmd = ['rmmod']
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if force:
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cmd.append('-f')
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cmd.append(module)
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log('Removing kernel module %s' % module, level=INFO)
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return check_call(cmd)
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def lsmod():
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"""Shows what kernel modules are currently loaded"""
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return check_output(['lsmod'],
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universal_newlines=True)
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def is_module_loaded(module):
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"""Checks if a kernel module is already loaded"""
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matches = re.findall('^%s[ ]+' % module, lsmod(), re.M)
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return len(matches) > 0
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def update_initramfs(version='all'):
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"""Updates an initramfs image"""
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return check_call(["update-initramfs", "-k", version, "-u"])
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