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# coding=utf-8
#
# Copyright © Cloud Linux GmbH & Cloud Linux Software, Inc 2010-2021 All Rights Reserved
#
# Licensed under CLOUD LINUX LICENSE AGREEMENT
# http://cloudlinux.com/docs/LICENCE.TXT
#
import os

from clcommon.const import Feature
from clcommon.utils import ExternalProgramFailed
from clconfig.cagefs_statistics_config import check_cagefs_initialized
from cllimits.cagefs_lib import CageFs, CageFsException
from clwizard.constants import MODULES_LOGS_DIR
from clwizard.exceptions import InstallationFailedException

from .base import WizardInstaller


class CagefsInstaller(WizardInstaller):
    LOG_FILE = os.path.join(MODULES_LOGS_DIR, 'cagefs.log')
    _REQUIRED_CL_COMPONENT_SUPPORT = Feature.CAGEFS

    def __init__(self):
        super().__init__()
        self.cgfs = CageFs(logger=self.app_logger)

    def _enable_existing_users(self):
        """
        Enable all users statuses and after it toggle to initial mode
        :return:
        """
        initial_mode = self.cgfs.get_user_mode()
        out = self.cgfs.set_enabled_mode()
        self.app_logger.info("Cagefs users status was updated to enabled: %s", out)
        if initial_mode == 'Disable All':
            self.cgfs.toggle_user_mode()

    def _set_enabled_mode(self):
        mode = self.cgfs.get_user_mode()
        self.app_logger.info("Current mode is: %s", mode)
        if mode == 'Disable All':
            self.app_logger.info("Try to set mode to Enable all")
            self.cgfs.toggle_user_mode()
            self.app_logger.info("Mode was toggled to Enable all")

    def _install_cagefs_package(self):
        if not self._is_package_installed('cagefs'):
            try:
                self._install_package('cagefs')
            except ExternalProgramFailed as err:
                raise InstallationFailedException() from err
        else:
            self.app_logger.info("Skip package installation, it is already installed")

    def _initialize_cagefs(self):
        if not check_cagefs_initialized():
            try:
                out = self.cgfs.initialize_cagefs()
                self.app_logger.info("Cagefs was initialized: %s", out)
            except CageFsException as err:
                self.app_logger.error("Cagefs initialization failed with error: %s", str(err))
                raise InstallationFailedException() from err
        else:
            self.app_logger.info("Initializing was skipped, cagefs was already initialized")

    def _enable_cagefs(self):
        try:
            out = self.cgfs.enable_cagefs()
            self.app_logger.info("Cagefs was enabled, ready for configuration\n %s", out)
        except CageFsException as err:
            raise InstallationFailedException() from err

    def run_installation(self, options):
        self._install_cagefs_package()
        self._initialize_cagefs()
        self._enable_cagefs()
        try:
            if options['enable_for_existing_users']:
                self._enable_existing_users()
            if options['enable_for_new_users']:
                self._set_enabled_mode()
        except CageFsException as err:
            self.app_logger.error("Can`t configure options: %s", str(err))
            raise InstallationFailedException() from err

    @classmethod
    def supported_options(cls):
        return {'enable_for_existing_users', 'enable_for_new_users'}

    def initial_status(self):
        try:
            enabled_for_new = self.cgfs.get_user_mode() == 'Enable All'
        except CageFsException:
            self.app_logger.warning(
                'Unable to detect cagefs mode, assuming that it is "Disable All"'
            )
            enabled_for_new = False

        return {
            # we always allow user to initialize cagefs
            # bool needed to replace None with False
            # None is given when cagefs is not installed
            'already_configured': bool(check_cagefs_initialized()),
            'options': {'enable_for_new_users': enabled_for_new},
        }