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Mini Shell
Mini Shell
"""
This program is free software: you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License,
or (at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
Copyright © 2019 Cloud Linux Software Inc.
This software is also available under ImunifyAV commercial license,
see <https://www.imunify360.com/legal/eula>
"""
from defence360agent.contracts.plugins import MessageSink
from defence360agent.utils import (
check_run,
recurring_check,
RecurringCheckStop,
)
from defence360agent.utils.resource_limits import is_lve_active, has_lvectl
class LveUtilsAutoInstaller(MessageSink):
"""
Install lve-utils package on CL with LVE automatically
(according to DEF-11452) to provide tools to limit CPU/IO.
Used tools:
/usr/sbin/lvectl - provided by lve-utils package
/bin/lve_suwrapper - provided by lve-wrappers package
(which is a dependency of lve-utils)
lve-utils package is installed by default on CL,
but for some reason may not exist.
"""
def __init__(self, *, check_period=3600):
self._check_period = check_period
self._task = None
async def create_sink(self, loop):
self._loop = loop
self._task = self._loop.create_task(
recurring_check(self._check_period)(
self._install_lve_utils_if_needed
)()
)
async def shutdown(self):
if self._task is not None:
self._task.cancel()
await self._task
self._task = None
async def _install_lve_utils_if_needed(self):
if not is_lve_active(): # kernel doesn't support lve or it is disabled
# no point trying to install lve-utils
raise RecurringCheckStop()
# suppose that lve should be actived on CL only
if not has_lvectl(): # utilities might have been removed
await check_run(["yum", "-y", "install", "lve-utils"])
Zerion Mini Shell 1.0