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Editing: plugin_service.py
from . import base import collections import tuned.consts as consts from .decorators import * import os import re import tuned.logs from tuned.utils.commands import commands log = tuned.logs.get() cmd = commands() class Service(): def __init__(self, start = None, enable = None, cfg_file = None, runlevel = None): self.enable = enable self.start = start self.cfg_file = cfg_file self.runlevel = runlevel class InitHandler(): def runlevel_get(self): (retcode, out) = cmd.execute(["runlevel"]) return out.split()[-1] if retcode == 0 else None def daemon_reload(self): cmd.execute(["telinit", "q"]) def cfg_install(self, name, cfg_file): pass def cfg_uninstall(self, name, cfg_file): pass def cfg_verify(self, name, cfg_file): return None # no enable/disable class SysVBasicHandler(InitHandler): def start(self, name): cmd.execute(["service", name, "start"]) def stop(self, name): cmd.execute(["service", name, "stop"]) def enable(self, name, runlevel): raise NotImplementedError() def disable(self, name, runlevel): raise NotImplementedError() def is_running(self, name): (retcode, out) = cmd.execute(["service", name, "status"], no_errors = [0]) return retcode == 0 def is_enabled(self, name, runlevel): raise NotImplementedError() class SysVHandler(SysVBasicHandler): def enable(self, name, runlevel): cmd.execute(["chkconfig", "--level", runlevel, name, "on"]) def disable(self, name, runlevel): cmd.execute(["chkconfig", "--level", runlevel, name, "off"]) def is_enabled(self, name, runlevel): (retcode, out) = cmd.execute(["chkconfig", "--list", name]) return out.split("%s:" % str(runlevel))[1][:2] == "on" if retcode == 0 else None class SysVRCHandler(SysVBasicHandler): def enable(self, name, runlevel): cmd.execute(["sysv-rc-conf", "--level", runlevel, name, "on"]) def disable(self, name, runlevel): cmd.execute(["sysv-rc-conf", "--level", runlevel, name, "off"]) def is_enabled(self, name, runlevel): (retcode, out) = cmd.execute(["sysv-rc-conf", "--list", name]) return out.split("%s:" % str(runlevel))[1][:2] == "on" if retcode == 0 else None class OpenRCHandler(InitHandler): def runlevel_get(self): (retcode, out) = cmd.execute(["rc-status", "-r"]) return out.strip() if retcode == 0 else None def start(self, name): cmd.execute(["rc-service", name, "start"]) def stop(self, name): cmd.execute(["rc-service", name, "stop"]) def enable(self, name, runlevel): cmd.execute(["rc-update", "add", name, runlevel]) def disable(self, name, runlevel): cmd.execute(["rc-update", "del", name, runlevel]) def is_running(self, name): (retcode, out) = cmd.execute(["rc-service", name, "status"], no_errors = [0]) return retcode == 0 def is_enabled(self, name, runlevel): (retcode, out) = cmd.execute(["rc-update", "show", runlevel]) return bool(re.search(r"\b" + re.escape(name) + r"\b", out)) class SystemdHandler(InitHandler): # runlevel not used def runlevel_get(self): return "" def start(self, name): cmd.execute(["systemctl", "restart", name]) def stop(self, name): cmd.execute(["systemctl", "stop", name]) def enable(self, name, runlevel): cmd.execute(["systemctl", "enable", name]) def disable(self, name, runlevel): cmd.execute(["systemctl", "disable", name]) def is_running(self, name): (retcode, out) = cmd.execute(["systemctl", "is-active", name], no_errors = [0]) return retcode == 0 def is_enabled(self, name, runlevel): (retcode, out) = cmd.execute(["systemctl", "is-enabled", name], no_errors = [0]) status = out.strip() return True if status == "enabled" else False if status =="disabled" else None def cfg_install(self, name, cfg_file): log.info("installing service configuration overlay file '%s' for service '%s'" % (cfg_file, name)) if not os.path.exists(cfg_file): log.error("Unable to find service configuration '%s'" % cfg_file) return dirpath = consts.SERVICE_SYSTEMD_CFG_PATH % name try: os.makedirs(dirpath, consts.DEF_SERVICE_CFG_DIR_MODE) except OSError as e: log.error("Unable to create directory '%s': %s" % (dirpath, e)) return cmd.copy(cfg_file, dirpath) self.daemon_reload() def cfg_uninstall(self, name, cfg_file): log.info("uninstalling service configuration overlay file '%s' for service '%s'" % (cfg_file, name)) dirpath = consts.SERVICE_SYSTEMD_CFG_PATH % name path = "%s/%s" % (dirpath, os.path.basename(cfg_file)) cmd.unlink(path) self.daemon_reload() # remove the service dir if empty, do not check for errors try: os.rmdir(dirpath) except (FileNotFoundError, OSError): pass def cfg_verify(self, name, cfg_file): if cfg_file is None: return None path = "%s/%s" % (consts.SERVICE_SYSTEMD_CFG_PATH % name, os.path.basename(cfg_file)) if not os.path.exists(cfg_file): log.error("Unable to find service '%s' configuration '%s'" % (name, cfg_file)) return False if not os.path.exists(path): log.error("Service '%s' configuration not installed in '%s'" % (name, path)) return False sha256sum1 = cmd.sha256sum(cfg_file) sha256sum2 = cmd.sha256sum(path) return sha256sum1 == sha256sum2 class ServicePlugin(base.Plugin): """ `service`:: Plug-in for handling sysvinit, sysv-rc, openrc and systemd services. + The syntax is as follows: + [subs="+quotes,+macros"] ---- [service] service.__service_name__=__commands__[,file:__file__] ---- + Supported service-handling `_commands_` are `start`, `stop`, `enable` and `disable`. The optional `file:__file__` directive installs an overlay configuration file `__file__`. Multiple commands must be comma (`,`) or semicolon (`;`) separated. If the directives conflict, the last one is used. + The service plugin supports configuration overlays only for systemd. In other init systems, this directive is ignored. The configuration overlay files are copied to `/etc/systemd/system/__service_name__.service.d/` directories. Upon profile unloading, the directory is removed if it is empty. + With systemd, the `start` command is implemented by `restart` in order to allow loading of the service configuration file overlay. + NOTE: With non-systemd init systems, the plug-in operates on the current runlevel only. + .Start and enable the `sendmail` service with an overlay file ==== ---- [service] service.sendmail=start,enable,file:${i:PROFILE_DIR}/tuned-sendmail.conf ---- The internal variable `${i:PROFILE_DIR}` points to the directory from which the profile is loaded. ==== """ def __init__(self, *args, **kwargs): super(ServicePlugin, self).__init__(*args, **kwargs) self._has_dynamic_options = True self._init_handler = self._detect_init_system() def _check_cmd(self, command): (retcode, out) = cmd.execute(command, no_errors = [0]) return retcode == 0 def _detect_init_system(self): if self._check_cmd(["systemctl", "status"]): log.debug("detected systemd") return SystemdHandler() elif self._check_cmd(["chkconfig"]): log.debug("detected generic sysvinit") return SysVHandler() elif self._check_cmd(["update-rc.d", "-h"]): log.debug("detected sysv-rc") return SysVRCHandler() elif self._check_cmd(["rc-update", "-h"]): log.debug("detected openrc") return OpenRCHandler() else: raise exceptions.NotSupportedPluginException("Unable to detect your init system, disabling the plugin.") def _parse_service_options(self, name, val): l = re.split(r"\s*[,;]\s*", val) service = Service() for i in l: if i == "enable": service.enable = True elif i == "disable": service.enable = False elif i == "start": service.start = True elif i == "stop": service.start = False elif i[:5] == "file:": service.cfg_file = i[5:] else: log.error("service '%s': invalid service option: '%s'" % (name, i)) return service def _instance_init(self, instance): instance._has_dynamic_tuning = False instance._has_static_tuning = True self._services = collections.OrderedDict([(option[8:], self._parse_service_options(option[8:], self._variables.expand(value))) for option, value in instance.options.items() if option[:8] == "service." and len(option) > 8]) instance._services_original = {} def _instance_cleanup(self, instance): pass def _process_service(self, name, start, enable, runlevel): if start: self._init_handler.start(name) elif start is not None: self._init_handler.stop(name) if enable: self._init_handler.enable(name, runlevel) elif enable is not None: self._init_handler.disable(name, runlevel) def _instance_apply_static(self, instance): runlevel = self._init_handler.runlevel_get() if runlevel is None: log.error("Cannot detect runlevel") return for service in self._services.items(): is_enabled = self._init_handler.is_enabled(service[0], runlevel) is_running = self._init_handler.is_running(service[0]) instance._services_original[service[0]] = Service(is_running, is_enabled, service[1].cfg_file, runlevel) if service[1].cfg_file: self._init_handler.cfg_install(service[0], service[1].cfg_file) self._process_service(service[0], service[1].start, service[1].enable, runlevel) def _instance_verify_static(self, instance, ignore_missing, devices): runlevel = self._init_handler.runlevel_get() if runlevel is None: log.error(consts.STR_VERIFY_PROFILE_FAIL % "cannot detect runlevel") return False ret = True for service in self._services.items(): ret_cfg_verify = self._init_handler.cfg_verify(service[0], service[1].cfg_file) if ret_cfg_verify: log.info(consts.STR_VERIFY_PROFILE_OK % "service '%s' configuration '%s' matches" % (service[0], service[1].cfg_file)) elif ret_cfg_verify is not None: log.error(consts.STR_VERIFY_PROFILE_FAIL % "service '%s' configuration '%s' differs" % (service[0], service[1].cfg_file)) ret = False else: log.info(consts.STR_VERIFY_PROFILE_VALUE_MISSING % "service '%s' configuration '%s'" % (service[0], service[1].cfg_file)) is_enabled = self._init_handler.is_enabled(service[0], runlevel) is_running = self._init_handler.is_running(service[0]) if self._verify_value("%s running" % service[0], service[1].start, is_running, ignore_missing) is False: ret = False if self._verify_value("%s enabled" % service[0], service[1].enable, is_enabled, ignore_missing) is False: ret = False return ret def _instance_unapply_static(self, instance, rollback = consts.ROLLBACK_SOFT): for name, value in list(instance._services_original.items()): if value.cfg_file: self._init_handler.cfg_uninstall(name, value.cfg_file) self._process_service(name, value.start, value.enable, value.runlevel)
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