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# Copyright 2015 Canonical, Ltd. # # 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, version 3. # # 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 <http://www.gnu.org/licenses/>. import asyncio import json import logging import os from subiquitycore.context import ( Context, ) from subiquitycore.controllerset import ControllerSet from subiquitycore.pubsub import MessageHub log = logging.getLogger('subiquitycore.core') class Application: # A concrete subclass must set project and controllers attributes, e.g.: # # project = "subiquity" # controllers = [ # "Welcome", # "Network", # "Filesystem", # "Identity", # "InstallProgress", # ] # The 'next_screen' and 'prev_screen' methods move through the list of # controllers in order, calling the make_ui method on the controller # instance. def __init__(self, opts): self._exc = None self.debug_flags = () if opts.dry_run: # Recognized flags are: # - install-fail: makes curtin install fail by replaying curtin # events from a failed installation, see # subiquity/controllers/installprogress.py # - bpfail-full, bpfail-restricted: makes block probing fail, see # subiquitycore/prober.py # - copy-logs-fail: makes post-install copying of logs fail, see # subiquity/controllers/installprogress.py self.debug_flags = os.environ.get('SUBIQUITY_DEBUG', '').split(',') self.opts = opts opts.project = self.project self.root = '/' if opts.dry_run: self.root = opts.output_base self.state_dir = os.path.join(self.root, 'run', self.project) os.makedirs(self.state_path('states'), exist_ok=True) self.scale_factor = float( os.environ.get('SUBIQUITY_REPLAY_TIMESCALE', "1")) self.updated = os.path.exists(self.state_path('updating')) self.hub = MessageHub() self.aio_loop = asyncio.get_event_loop() self.aio_loop.set_exception_handler(self._exception_handler) self.load_controllers(self.controllers) self.context = Context.new(self) def load_controllers(self, controllers): """ Load the corresponding list of controllers Those will need to be restarted if already started """ self.controllers = ControllerSet( self.controllers_mod, controllers, init_args=(self,)) def _exception_handler(self, loop, context): exc = context.get('exception') if exc: loop.stop() self._exc = exc else: loop.default_exception_handler(context) def state_path(self, *parts): return os.path.join(self.state_dir, *parts) def save_state(self): cur = self.controllers.cur if cur is None: return with open(self.state_path('states', cur.name), 'w') as fp: json.dump(cur.serialize(), fp) def report_start_event(self, context, description): log = logging.getLogger(context.full_name()) level = getattr(logging, context.level) log.log(level, "start: %s", description) def report_finish_event(self, context, description, status): log = logging.getLogger(context.full_name()) level = getattr(logging, context.level) log.log(level, "finish: %s %s", description, status.name) # EventLoop ------------------------------------------------------------------- def exit(self): self.aio_loop.stop() def start_controllers(self): log.debug("starting controllers") for controller in self.controllers.instances: controller.start() log.debug("controllers started") async def start(self): self.controllers.load_all() self.start_controllers() def run(self): self.base_model = self.make_model() self.aio_loop.create_task(self.start()) self.aio_loop.run_forever() if self._exc: exc, self._exc = self._exc, None raise exc