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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"])
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