mirror of
https://github.com/google/glazier.git
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98 lines
3.0 KiB
Python
98 lines
3.0 KiB
Python
# Copyright 2016 Google Inc. All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Manages the execution of the local host task list."""
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import sys
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from glazier.lib import policies
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from glazier.lib import power
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from glazier.lib.config import base
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from glazier.lib.config import files
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class ConfigRunnerError(base.ConfigError):
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pass
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class ConfigRunner(base.ConfigBase):
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"""Executes all steps from the installation task list."""
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def Start(self, task_list):
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self._task_list_path = task_list
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try:
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data = files.Read(self._task_list_path)
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except files.Error as e:
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raise ConfigRunnerError(e)
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self._ProcessTasks(data)
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def _PopTask(self, tasks):
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"""Remove the first event from the task list and save new list to disk."""
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tasks.pop(0)
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try:
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files.Dump(self._task_list_path, tasks, mode='w')
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except files.Error as e:
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raise ConfigRunnerError(e)
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def _ProcessTasks(self, tasks):
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"""Process the pending tasks list.
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Args:
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tasks: The list of pending tasks.
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"""
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while tasks:
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entry = tasks[0]['data']
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self._build_info.ActiveConfigPath(set_to=tasks[0]['path'])
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for element in entry:
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if element == 'policy':
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for line in entry['policy']:
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self._Policy(line)
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else:
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try:
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self._ProcessAction(element, entry[element])
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except base.ConfigError as e:
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raise ConfigRunnerError(e)
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except base.actions.RestartEvent as e:
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if e.task_list_path:
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self._task_list_path = e.task_list_path
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if not e.retry_on_restart:
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self._PopTask(tasks)
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power.Restart(e.timeout, e.message)
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sys.exit(0)
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except base.actions.ShutdownEvent as e:
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if e.task_list_path:
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self._task_list_path = e.task_list_path
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if not e.retry_on_restart:
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self._PopTask(tasks)
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power.Shutdown(e.timeout, e.message)
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sys.exit(0)
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self._PopTask(tasks)
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def _Policy(self, line):
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"""Execute an imaging policy check.
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Args:
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line: The name of a supported imaging policy.
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Raises:
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ConfigRunnerError: An imaging policy has raised an exception.
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"""
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try:
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check = getattr(policies, str(line))
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policy = check(build_info=self._build_info)
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policy.Verify()
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except AttributeError:
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raise ConfigRunnerError('Unknown imaging policy: %s' % str(line))
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except policies.ImagingPolicyException as e:
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raise ConfigRunnerError(str(e))
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