""" Copyright 2013 Rackspace, Inc. Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. """ import hashlib import os import requests import subprocess import time from ironic_python_agent import base from ironic_python_agent import configdrive from ironic_python_agent import decorators from ironic_python_agent import errors from ironic_python_agent import hardware from ironic_python_agent.openstack.common import log LOG = log.getLogger(__name__) def _configdrive_location(): return '/tmp/configdrive' def _image_location(image_info): return '/tmp/{0}'.format(image_info['id']) def _path_to_script(script): cwd = os.path.dirname(os.path.realpath(__file__)) return os.path.join(cwd, script) def _write_image(image_info, device): starttime = time.time() image = _image_location(image_info) script = _path_to_script('shell/write_image.sh') command = ['/bin/bash', script, image, device] LOG.info('Writing image with command: {0}'.format(' '.join(command))) exit_code = subprocess.call(command) if exit_code != 0: raise errors.ImageWriteError(exit_code, device) totaltime = time.time() - starttime LOG.info('Image {0} written to device {1} in {2} seconds'.format( image, device, totaltime)) def _copy_configdrive_to_disk(configdrive_dir, device): starttime = time.time() script = _path_to_script('shell/copy_configdrive_to_disk.sh') command = ['/bin/bash', script, configdrive_dir, device] LOG.info('copying configdrive to disk with command {0}'.format( ' '.join(command))) exit_code = subprocess.call(command) if exit_code != 0: raise errors.ConfigDriveWriteError(exit_code, device) totaltime = time.time() - starttime LOG.info('configdrive copied from {0} to {1} in {2} seconds'.format( configdrive_dir, device, totaltime)) def _request_url(image_info, url): resp = requests.get(url, stream=True) if resp.status_code != 200: raise errors.ImageDownloadError(image_info['id']) return resp def _download_image(image_info): starttime = time.time() resp = None for url in image_info['urls']: try: LOG.info("Attempting to download image from {0}".format(url)) resp = _request_url(image_info, url) except errors.ImageDownloadError: failtime = time.time() - starttime log_msg = "Image download failed. URL: {0}; time: {1} seconds" LOG.warning(log_msg.format(url, failtime)) continue else: break if resp is None: raise errors.ImageDownloadError(image_info['id']) image_location = _image_location(image_info) with open(image_location, 'wb') as f: try: for chunk in resp.iter_content(1024 * 1024): f.write(chunk) except Exception: raise errors.ImageDownloadError(image_info['id']) totaltime = time.time() - starttime LOG.info("Image downloaded from {0} in {1} seconds".format(image_location, totaltime)) if not _verify_image(image_info, image_location): raise errors.ImageChecksumError(image_info['id']) def _verify_image(image_info, image_location): hashes = image_info['hashes'] for k, v in hashes.iteritems(): algo = getattr(hashlib, k, None) if algo is None: continue log_msg = 'Verifying image at {0} with algorithm {1} against hash {2}' LOG.debug(log_msg.format(image_location, k, v)) hash_ = algo(open(image_location).read()).hexdigest() if hash_ == v: return True else: log_msg = ('Image verification failed. Location: {0};' 'algorithm: {1}; image hash: {2};' 'verification hash: {3}') LOG.warning(log_msg.format(image_location, k, hash_, v)) return False def _validate_image_info(image_info=None, **kwargs): image_info = image_info or {} for field in ['id', 'urls', 'hashes']: if field not in image_info: msg = 'Image is missing \'{0}\' field.'.format(field) raise errors.InvalidCommandParamsError(msg) if type(image_info['urls']) != list or not image_info['urls']: raise errors.InvalidCommandParamsError( 'Image \'urls\' must be a list with at least one element.') if type(image_info['hashes']) != dict or not image_info['hashes']: raise errors.InvalidCommandParamsError( 'Image \'hashes\' must be a dictionary with at least one ' 'element.') class StandbyExtension(base.BaseAgentExtension): def __init__(self): super(StandbyExtension, self).__init__('STANDBY') self.command_map['cache_image'] = self.cache_image self.command_map['prepare_image'] = self.prepare_image self.command_map['run_image'] = self.run_image self.cached_image_id = None @decorators.async_command(_validate_image_info) def cache_image(self, command_name, image_info=None, force=False): device = hardware.get_manager().get_os_install_device() if self.cached_image_id != image_info['id'] or force: _download_image(image_info) _write_image(image_info, device) self.cached_image_id = image_info['id'] @decorators.async_command(_validate_image_info) def prepare_image(self, command_name, image_info=None, metadata=None, files=None): location = _configdrive_location() device = hardware.get_manager().get_os_install_device() # don't write image again if already cached if self.cached_image_id != image_info['id']: _download_image(image_info) _write_image(image_info, device) self.cached_image_id = image_info['id'] LOG.debug('Writing configdrive to {0}'.format(location)) configdrive.write_configdrive(location, metadata, files) _copy_configdrive_to_disk(location, device) @decorators.async_command() def run_image(self, command_name): script = _path_to_script('shell/reboot.sh') LOG.info('Rebooting system') command = ['/bin/bash', script] # this should never return if successful exit_code = subprocess.call(command) if exit_code != 0: raise errors.SystemRebootError(exit_code)