Source code for labgrid.autoinstall.main

"""The autoinstall.main module runs an installation script automatically on multiple targets."""
import ast
import argparse
import logging
import sys
import multiprocessing
import textwrap
from time import sleep

from .. import Environment, target_factory
from ..stepreporter import StepReporter
from ..exceptions import NoResourceFoundError

[docs]class Handler(multiprocessing.Process):
[docs] def __init__(self, env, args, name): super().__init__(name=name) self.env = env self.args = args self.config = env.config = name self.context = { 'name':, 'env': self.env, 'config': self.config, } self.context.update(target_factory.resources) self.context.update(target_factory.drivers)
def _get_function(self, name, context): snippet =['autoinstall'].get(name) if not snippet: return None code = 'def {}():\n{}'.format(name, textwrap.indent(snippet, ' ')) tree = ast.parse(code, filename=self.env.config_file) ast.increment_lineno(tree, snippet.start_mark.line) co = compile(tree, filename=self.env.config_file, mode='exec') stage = {} exec(co, context, stage) # pylint: disable=exec-used return stage[name] def _get_setup_function(self): context = self.context context['log'] = self.log.getChild('setup') setup = self._get_function('setup', self.context) if setup is None: def setup(): # pylint: disable=function-redefined pass return setup def _get_handler_function(self): context = self.context.copy() context['log'] = self.log.getChild('handler') handler = self._get_function('handler', context) return handler def _get_initial_resource(self): cls =['autoinstall'].get('initial-resource') if not cls: return None return[cls], wait_avail=False)
[docs] def run(self): self.log = logging.getLogger("creating new handler (PID %s)", try: = self.env.get_target( self.context['target'] = if is None: raise KeyError except Exception: # pylint: disable=broad-except self.log.exception("target creation failed") return self.setup = self._get_setup_function() self.setup() self.initial_resource = self._get_initial_resource() self.handler = self._get_handler_function() while self.run_once(): sleep(3)
[docs] def run_once(self): try: if self.initial_resource:"waiting until %s is available", self.initial_resource.display_name) while True: if self.initial_resource.avail: break sleep(0.25)"starting handler") result = self.handler() if result is not None: self.log.warning("unexpected return value from handler: %s", repr(result))"completed handler") if self.initial_resource:"waiting until %s is unavailable", self.initial_resource.display_name) while True: if not self.initial_resource.avail: break sleep(0.25) except NoResourceFoundError as e: if e.filter and len(e.filter) > 1: self.log.warning("resources %s not found, restarting", e.filter) elif e.filter: self.log.warning("resource %s not found, restarting", next(iter(e.filter))) else: self.log.warning("resource not found, restarting") except Exception: # pylint: disable=broad-except self.log.exception("handler failed") return False if self.args.once:"stopping handler (--once)") return False return True
[docs]class Manager:
[docs] def __init__(self, env, args): self.env = env self.args = args self.config = env.config self.log = logging.getLogger("manager")
[docs] def configure(self): if not 'autoinstall' in self.log.error("no 'autoinstall' section found in '%s'", self.env.config_file) return False if not 'handler' in['autoinstall']: self.log.error("no 'handler' definition found in '%s'", self.env.config_file) return False self.handlers = {} for target_name in'targets', {}).keys(): self.handlers[target_name] = Handler(self.env, self.args, target_name) if not self.handlers: self.log.error("no targets found in '%s'", self.env.config_file) return False return True
[docs] def start(self): for i, handler in enumerate(self.handlers.values()): if i: # give previous handler some time to start sleep(3) handler.daemon = True handler.start()
[docs] def join(self): for handler in self.handlers.values(): handler.join()
[docs]def main(): logging.basicConfig( level=logging.INFO, format='%(levelname)7s %(name)-20s %(message)s', stream=sys.stderr, ) parser = argparse.ArgumentParser() parser.add_argument( '-d', '--debug', action='store_true', default=False, help="enable debug mode" ) parser.add_argument( '--once', action='store_true', default=False, help="handle each target only once" ) parser.add_argument( 'config', type=str, help="config file" ) args = parser.parse_args() if args.debug: logging.getLogger().setLevel(logging.DEBUG) env = Environment(config_file=args.config) StepReporter() manager = Manager(env, args) if not manager.configure(): exit(1) manager.start() manager.join()
if __name__ == "__main__": main()