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by Neil Jerram
Pull in latest lp:charm-helpers code |
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#!/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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# This file is part of charm-helpers.
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#
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# charm-helpers is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License version 3 as
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# published by the Free Software Foundation.
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#
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# charm-helpers is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with charm-helpers. If not, see <http://www.gnu.org/licenses/>.
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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"]) |