| #! /usr/bin/env python3 |
| # -*- coding: utf-8 -*- |
| |
| # COPYRIGHT NOTICE STARTS HERE |
| |
| # Copyright 2019 © Samsung Electronics Co., Ltd. |
| # |
| # 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. |
| |
| # COPYRIGHT NOTICE ENDS HERE |
| |
| import argparse |
| import datetime |
| import itertools |
| import logging |
| import os |
| import sys |
| import timeit |
| |
| import docker |
| from retrying import retry |
| |
| from concurrent_downloader import ConcurrentDownloader |
| |
| log = logging.getLogger(__name__) |
| |
| |
| class DockerDownloader(ConcurrentDownloader): |
| def __init__(self, save, *list_args, workers=3): |
| self._save = save |
| try: |
| # big timeout in case of massive images like pnda-mirror-container:5.0.0 (11.4GB) |
| self._docker_client = docker.client.DockerClient(version='auto', timeout=300) |
| except docker.errors.DockerException as err: |
| log.exception( |
| 'Error creating docker client. Check if is docker installed and running' |
| ' or if you have right permissions.') |
| raise err |
| self._pulled_images = set(itertools.chain.from_iterable((image.tags for image |
| in self._docker_client.images.list()))) |
| list_args = ([*x, None] if len(x) < 2 else x for x in list_args) |
| super().__init__('docker images', *list_args, workers=workers) |
| |
| @staticmethod |
| def image_registry_name(image_name): |
| """ |
| Get the name as shown in local registry. Since some strings are not part of name |
| when using default registry e.g. docker.io |
| :param image_name: name of the image from the list |
| :return: name of the image as it is shown by docker |
| """ |
| name = image_name |
| |
| if name.startswith('docker.io/'): |
| name = name.replace('docker.io/', '') |
| |
| if name.startswith('library/'): |
| name = name.replace('library/', '') |
| |
| if ':' not in name.rsplit('/')[-1]: |
| name = '{}:latest'.format(name) |
| |
| return name |
| |
| @property |
| def check_table(self): |
| """ |
| Table showing information of which images are pulled/saved |
| """ |
| self.missing() |
| return self._table(self._data_list) |
| |
| @property |
| def fail_table(self): |
| """ |
| Table showing information about state of download of images |
| that encountered problems while downloading |
| """ |
| return self._table(self.missing()) |
| |
| @staticmethod |
| def _image_filename(image_name): |
| """ |
| Get a name of a file where image will be saved. |
| :param image_name: Name of the image from list |
| :return: Filename of the image |
| """ |
| return '{}.tar'.format(image_name.replace(':', '_').replace('/', '_')) |
| |
| def _table(self, images): |
| """ |
| Get table in format for images |
| :param images: images to put into table |
| :return: check table format with specified images |
| """ |
| header = ['Name', 'Pulled', 'Saved'] |
| data = [] |
| for item in images: |
| if item not in self._missing: |
| data.append((item, True, True if self._save else 'N/A')) |
| else: |
| data.append((item, self._missing[item]['pulled'], self._missing[item]['saved'])) |
| return self._check_table(header, {'Name': 'l'}, data) |
| |
| def _is_pulled(self, image): |
| return self.image_registry_name(image) in self._pulled_images |
| |
| def _is_saved(self, image): |
| dst = '{}/{}'.format(self._data_list[image], self._image_filename(image)) |
| return os.path.isfile(dst) |
| |
| def _is_missing(self, item): |
| """ |
| Missing docker images are checked slightly differently. |
| """ |
| pass |
| |
| def missing(self): |
| """ |
| Get dictionary of images not present locally. |
| """ |
| missing = dict() |
| for image, dst in self._data_list.items(): |
| pulled = self._is_pulled(image) |
| if self._save: |
| # if pulling and save is True. Save every pulled image to assure parity |
| saved = False if not pulled else self._is_saved(image) |
| else: |
| saved = 'N/A' |
| if not pulled or not saved: |
| missing[image] = {'dst': dst, 'pulled': pulled, 'saved': saved} |
| self._missing = missing |
| return self._missing |
| |
| @retry(stop_max_attempt_number=5, wait_fixed=5000) |
| def _pull_image(self, image_name): |
| """ |
| Pull docker image. |
| :param image_name: name of the image to be pulled |
| :return: pulled image (image object) |
| :raises docker.errors.APIError: after unsuccessful retries |
| """ |
| if ':' not in image_name.rsplit('/')[-1]: |
| image_name = '{}:latest'.format(image_name) |
| try: |
| image = self._docker_client.images.pull(image_name) |
| log.info('Image {} pulled'.format(image_name)) |
| return image |
| except docker.errors.APIError as err: |
| log.warning('Failed: {}: {}. Retrying...'.format(image_name, err)) |
| raise err |
| |
| def _save_image(self, image_name, image, output_dir): |
| """ |
| Save image to tar. |
| :param output_dir: path to destination directory |
| :param image: image object from pull_image function |
| :param image_name: name of the image from list |
| """ |
| dst = '{}/{}'.format(output_dir, self._image_filename(image_name)) |
| if not os.path.exists(output_dir): |
| os.makedirs(output_dir) |
| try: |
| with open(dst, 'wb') as f: |
| for chunk in image.save(named=self.image_registry_name(image_name)): |
| f.write(chunk) |
| log.info('Image {} saved as {}'.format(image_name, dst)) |
| except Exception as err: |
| if os.path.isfile(dst): |
| os.remove(dst) |
| raise err |
| |
| def _download_item(self, image): |
| """ Pull and save docker image from specified docker registry |
| :param image: image to be downloaded |
| """ |
| image_name, image_dict = image |
| log.info('Downloading image: {}'.format(image_name)) |
| try: |
| if image_dict['pulled']: |
| image_to_save = self._docker_client.images.get(image_name) |
| else: |
| image_to_save = self._pull_image(image_name) |
| if self._save: |
| self._save_image(image_name, image_to_save, image_dict['dst']) |
| except Exception as err: |
| log.exception('Error downloading {}: {}'.format(image_name, err)) |
| raise err |
| |
| |
| def run_cli(): |
| parser = argparse.ArgumentParser(description='Download docker images from list') |
| parser.add_argument('image_list', metavar='image-list', |
| help='File with list of images to download.') |
| parser.add_argument('--save', '-s', action='store_true', default=False, |
| help='Save images (without it only pull is executed)') |
| parser.add_argument('--output-dir', '-o', default=os.getcwd(), |
| help='Download destination') |
| parser.add_argument('--check', '-c', action='store_true', default=False, |
| help='Check what is missing. No download.' |
| 'Use with combination with -s to check saved images as well.') |
| parser.add_argument('--debug', action='store_true', default=False, |
| help='Turn on debug output') |
| parser.add_argument('--workers', type=int, default=3, |
| help='Set maximum workers for parallel download (default: 3)') |
| |
| args = parser.parse_args() |
| |
| if args.debug: |
| logging.basicConfig(stream=sys.stdout, level=logging.DEBUG) |
| else: |
| logging.basicConfig(stream=sys.stdout, level=logging.INFO, format='%(message)s') |
| |
| downloader = DockerDownloader(args.save, [args.file_list, args.output_dir], workers=args.workers) |
| |
| if args.check: |
| log.info('Check mode. No download will be executed.') |
| log.info(downloader.check_table) |
| sys.exit(0) |
| |
| timer_start = timeit.default_timer() |
| try: |
| downloader.download() |
| except RuntimeError: |
| sys.exit(1) |
| finally: |
| log.info('Downloading finished in {}'.format( |
| datetime.timedelta(seconds=timeit.default_timer() - timer_start))) |
| |
| |
| if __name__ == '__main__': |
| run_cli() |