From 4faa7f927149a5c4ef7a03523f7bc14523cb9baa Mon Sep 17 00:00:00 2001 From: Stuart Mackie Date: Fri, 7 Oct 2016 12:24:58 -0700 Subject: Charms for Contrail 3.1 with Mitaka Change-Id: Id37f3b9743d1974e31fcd7cd9c54be41bb0c47fb Signed-off-by: Stuart Mackie --- .../cassandra/hooks/charmhelpers/core/kernel.py | 68 ++++++++++++++++++++++ 1 file changed, 68 insertions(+) create mode 100644 charms/trusty/cassandra/hooks/charmhelpers/core/kernel.py (limited to 'charms/trusty/cassandra/hooks/charmhelpers/core/kernel.py') diff --git a/charms/trusty/cassandra/hooks/charmhelpers/core/kernel.py b/charms/trusty/cassandra/hooks/charmhelpers/core/kernel.py new file mode 100644 index 0000000..5dc6495 --- /dev/null +++ b/charms/trusty/cassandra/hooks/charmhelpers/core/kernel.py @@ -0,0 +1,68 @@ +#!/usr/bin/env python +# -*- coding: utf-8 -*- + +# Copyright 2014-2015 Canonical Limited. +# +# This file is part of charm-helpers. +# +# charm-helpers is free software: you can redistribute it and/or modify +# it under the terms of the GNU Lesser General Public License version 3 as +# published by the Free Software Foundation. +# +# charm-helpers is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU Lesser General Public License for more details. +# +# You should have received a copy of the GNU Lesser General Public License +# along with charm-helpers. If not, see . + +__author__ = "Jorge Niedbalski " + +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"]) -- cgit 1.2.3-korg