from builtins import next import argparse import collections import datetime import errno import json import os import re import subprocess import sys import tarfile import tempfile import shutil import _strptime from operator import itemgetter from stat import * import arvados import arvados.util import arvados.commands._util as arv_cmd import arvados.commands.put as arv_put from arvados.collection import CollectionReader import ciso8601 import logging import arvados.config from arvados._version import __version__ logger = logging.getLogger('arvados.keepdocker') logger.setLevel(logging.DEBUG if arvados.config.get('ARVADOS_DEBUG') else logging.INFO) EARLIEST_DATETIME = datetime.datetime(datetime.MINYEAR, 1, 1, 0, 0, 0) STAT_CACHE_ERRORS = (IOError, OSError, ValueError) DockerImage = collections.namedtuple( 'DockerImage', ['repo', 'tag', 'hash', 'created', 'vsize']) keepdocker_parser = argparse.ArgumentParser(add_help=False) keepdocker_parser.add_argument( '--version', action='version', version="%s %s" % (sys.argv[0], __version__), help='Print version and exit.') keepdocker_parser.add_argument( '-f', '--force', action='store_true', default=False, help="Re-upload the image even if it already exists on the server") keepdocker_parser.add_argument( '--force-image-format', action='store_true', default=False, help="Proceed even if the image format is not supported by the server") _group = keepdocker_parser.add_mutually_exclusive_group() _group.add_argument( '--pull', action='store_true', default=False, help="Try to pull the latest image from Docker registry") _group.add_argument( '--no-pull', action='store_false', dest='pull', help="Use locally installed image only, don't pull image from Docker registry (default)") keepdocker_parser.add_argument( 'image', nargs='?', help="Docker image to upload, as a repository name or hash") keepdocker_parser.add_argument( 'tag', nargs='?', default='latest', help="Tag of the Docker image to upload (default 'latest')") # Combine keepdocker options listed above with run_opts options of arv-put. # The options inherited from arv-put include --name, --project-uuid, # --progress/--no-progress/--batch-progress and --resume/--no-resume. arg_parser = argparse.ArgumentParser( description="Upload or list Docker images in Arvados", parents=[keepdocker_parser, arv_put.run_opts, arv_cmd.retry_opt]) class DockerError(Exception): pass def popen_docker(cmd, *args, **kwargs): manage_stdin = ('stdin' not in kwargs) kwargs.setdefault('stdin', subprocess.PIPE) kwargs.setdefault('stdout', sys.stderr) try: docker_proc = subprocess.Popen(['docker.io'] + cmd, *args, **kwargs) except OSError: # No docker.io in $PATH docker_proc = subprocess.Popen(['docker'] + cmd, *args, **kwargs) if manage_stdin: docker_proc.stdin.close() return docker_proc def check_docker(proc, description): proc.wait() if proc.returncode != 0: raise DockerError("docker {} returned status code {}". format(description, proc.returncode)) def docker_image_format(image_hash): """Return the registry format ('v1' or 'v2') of the given image.""" cmd = popen_docker(['inspect', '--format={{.Id}}', image_hash], stdout=subprocess.PIPE) try: image_id = next(cmd.stdout).decode().strip() if image_id.startswith('sha256:'): return 'v2' elif ':' not in image_id: return 'v1' else: return 'unknown' finally: check_docker(cmd, "inspect") def docker_image_compatible(api, image_hash): supported = api._rootDesc.get('dockerImageFormats', []) if not supported: logger.warning("server does not specify supported image formats (see docker_image_formats in server config).") return False fmt = docker_image_format(image_hash) if fmt in supported: return True else: logger.error("image format is {!r} " \ "but server supports only {!r}".format(fmt, supported)) return False def docker_images(): # Yield a DockerImage tuple for each installed image. list_proc = popen_docker(['images', '--no-trunc'], stdout=subprocess.PIPE) list_output = iter(list_proc.stdout) next(list_output) # Ignore the header line for line in list_output: words = line.split() size_index = len(words) - 2 repo, tag, imageid = words[:3] ctime = ' '.join(words[3:size_index]) vsize = ' '.join(words[size_index:]) yield DockerImage(repo, tag, imageid, ctime, vsize) list_proc.stdout.close() check_docker(list_proc, "images") def find_image_hashes(image_search, image_tag=None): # Given one argument, search for Docker images with matching hashes, # and return their full hashes in a set. # Given two arguments, also search for a Docker image with the # same repository and tag. If one is found, return its hash in a # set; otherwise, fall back to the one-argument hash search. # Returns None if no match is found, or a hash search is ambiguous. hash_search = image_search.lower() hash_matches = set() for image in docker_images(): if (image.repo == image_search) and (image.tag == image_tag): return set([image.hash]) elif image.hash.startswith(hash_search): hash_matches.add(image.hash) return hash_matches def find_one_image_hash(image_search, image_tag=None): hashes = find_image_hashes(image_search, image_tag) hash_count = len(hashes) if hash_count == 1: return hashes.pop() elif hash_count == 0: raise DockerError("no matching image found") else: raise DockerError("{} images match {}".format(hash_count, image_search)) def stat_cache_name(image_file): return getattr(image_file, 'name', image_file) + '.stat' def pull_image(image_name, image_tag): check_docker(popen_docker(['pull', '{}:{}'.format(image_name, image_tag)]), "pull") def save_image(image_hash, image_file): # Save the specified Docker image to image_file, then try to save its # stats so we can try to resume after interruption. check_docker(popen_docker(['save', image_hash], stdout=image_file), "save") image_file.flush() try: with open(stat_cache_name(image_file), 'w') as statfile: json.dump(tuple(os.fstat(image_file.fileno())), statfile) except STAT_CACHE_ERRORS: pass # We won't resume from this cache. No big deal. def prep_image_file(filename): # Return a file object ready to save a Docker image, # and a boolean indicating whether or not we need to actually save the # image (False if a cached save is available). cache_dir = arv_cmd.make_home_conf_dir( os.path.join('.cache', 'arvados', 'docker'), 0o700) if cache_dir is None: image_file = tempfile.NamedTemporaryFile(suffix='.tar') need_save = True else: file_path = os.path.join(cache_dir, filename) try: with open(stat_cache_name(file_path)) as statfile: prev_stat = json.load(statfile) now_stat = os.stat(file_path) need_save = any(prev_stat[field] != now_stat[field] for field in [ST_MTIME, ST_SIZE]) except STAT_CACHE_ERRORS + (AttributeError, IndexError): need_save = True # We couldn't compare against old stats image_file = open(file_path, 'w+b' if need_save else 'rb') return image_file, need_save def make_link(api_client, num_retries, link_class, link_name, **link_attrs): link_attrs.update({'link_class': link_class, 'name': link_name}) return api_client.links().create(body=link_attrs).execute( num_retries=num_retries) def docker_link_sort_key(link): """Build a sort key to find the latest available Docker image. To find one source collection for a Docker image referenced by name or image id, the API server looks for a link with the most recent `image_timestamp` property; then the most recent `created_at` timestamp. This method generates a sort key for Docker metadata links to sort them from least to most preferred. """ try: image_timestamp = ciso8601.parse_datetime_unaware( link['properties']['image_timestamp']) except (KeyError, ValueError): image_timestamp = EARLIEST_DATETIME return (image_timestamp, ciso8601.parse_datetime_unaware(link['created_at'])) def _get_docker_links(api_client, num_retries, **kwargs): links = arvados.util.list_all(api_client.links().list, num_retries, **kwargs) for link in links: link['_sort_key'] = docker_link_sort_key(link) links.sort(key=itemgetter('_sort_key'), reverse=True) return links def _new_image_listing(link, dockerhash, repo='', tag=''): timestamp_index = 1 if (link['_sort_key'][0] is EARLIEST_DATETIME) else 0 return { '_sort_key': link['_sort_key'], 'timestamp': link['_sort_key'][timestamp_index], 'collection': link['head_uuid'], 'dockerhash': dockerhash, 'repo': repo, 'tag': tag, } def list_images_in_arv(api_client, num_retries, image_name=None, image_tag=None): """List all Docker images known to the api_client with image_name and image_tag. If no image_name is given, defaults to listing all Docker images. Returns a list of tuples representing matching Docker images, sorted in preference order (i.e. the first collection in the list is the one that the API server would use). Each tuple is a (collection_uuid, collection_info) pair, where collection_info is a dict with fields "dockerhash", "repo", "tag", and "timestamp". """ search_filters = [] repo_links = None hash_links = None if image_name: # Find images with the name the user specified. search_links = _get_docker_links( api_client, num_retries, filters=[['link_class', '=', 'docker_image_repo+tag'], ['name', '=', '{}:{}'.format(image_name, image_tag or 'latest')]]) if search_links: repo_links = search_links else: # Fall back to finding images with the specified image hash. search_links = _get_docker_links( api_client, num_retries, filters=[['link_class', '=', 'docker_image_hash'], ['name', 'ilike', image_name + '%']]) hash_links = search_links # Only list information about images that were found in the search. search_filters.append(['head_uuid', 'in', [link['head_uuid'] for link in search_links]]) # It should be reasonable to expect that each collection only has one # image hash (though there may be many links specifying this). Find # the API server's most preferred image hash link for each collection. if hash_links is None: hash_links = _get_docker_links( api_client, num_retries, filters=search_filters + [['link_class', '=', 'docker_image_hash']]) hash_link_map = {link['head_uuid']: link for link in reversed(hash_links)} # Each collection may have more than one name (though again, one name # may be specified more than once). Build an image listing from name # tags, sorted by API server preference. if repo_links is None: repo_links = _get_docker_links( api_client, num_retries, filters=search_filters + [['link_class', '=', 'docker_image_repo+tag']]) seen_image_names = collections.defaultdict(set) images = [] for link in repo_links: collection_uuid = link['head_uuid'] if link['name'] in seen_image_names[collection_uuid]: continue seen_image_names[collection_uuid].add(link['name']) try: dockerhash = hash_link_map[collection_uuid]['name'] except KeyError: dockerhash = '' name_parts = link['name'].split(':', 1) images.append(_new_image_listing(link, dockerhash, *name_parts)) # Find any image hash links that did not have a corresponding name link, # and add image listings for them, retaining the API server preference # sorting. images_start_size = len(images) for collection_uuid, link in hash_link_map.items(): if not seen_image_names[collection_uuid]: images.append(_new_image_listing(link, link['name'])) if len(images) > images_start_size: images.sort(key=itemgetter('_sort_key'), reverse=True) # Remove any image listings that refer to unknown collections. existing_coll_uuids = {coll['uuid'] for coll in arvados.util.list_all( api_client.collections().list, num_retries, filters=[['uuid', 'in', [im['collection'] for im in images]]], select=['uuid'])} return [(image['collection'], image) for image in images if image['collection'] in existing_coll_uuids] def items_owned_by(owner_uuid, arv_items): return (item for item in arv_items if item['owner_uuid'] == owner_uuid) def _uuid2pdh(api, uuid): return api.collections().list( filters=[['uuid', '=', uuid]], select=['portable_data_hash'], ).execute()['items'][0]['portable_data_hash'] def main(arguments=None, stdout=sys.stdout): args = arg_parser.parse_args(arguments) api = arvados.api('v1') if args.image is None or args.image == 'images': fmt = "{:30} {:10} {:12} {:29} {:20}\n" stdout.write(fmt.format("REPOSITORY", "TAG", "IMAGE ID", "COLLECTION", "CREATED")) try: for i, j in list_images_in_arv(api, args.retries): stdout.write(fmt.format(j["repo"], j["tag"], j["dockerhash"][0:12], i, j["timestamp"].strftime("%c"))) except IOError as e: if e.errno == errno.EPIPE: pass else: raise sys.exit(0) # Pull the image if requested, unless the image is specified as a hash # that we already have. if args.pull and not find_image_hashes(args.image): pull_image(args.image, args.tag) try: image_hash = find_one_image_hash(args.image, args.tag) except DockerError as error: logger.error(error.message) sys.exit(1) if not docker_image_compatible(api, image_hash): if args.force_image_format: logger.warning("forcing incompatible image") else: logger.error("refusing to store " \ "incompatible format (use --force-image-format to override)") sys.exit(1) image_repo_tag = '{}:{}'.format(args.image, args.tag) if not image_hash.startswith(args.image.lower()) else None if args.name is None: if image_repo_tag: collection_name = 'Docker image {} {}'.format(image_repo_tag, image_hash[0:12]) else: collection_name = 'Docker image {}'.format(image_hash[0:12]) else: collection_name = args.name if not args.force: # Check if this image is already in Arvados. # Project where everything should be owned if args.project_uuid: parent_project_uuid = args.project_uuid else: parent_project_uuid = api.users().current().execute( num_retries=args.retries)['uuid'] # Find image hash tags existing_links = _get_docker_links( api, args.retries, filters=[['link_class', '=', 'docker_image_hash'], ['name', '=', image_hash]]) if existing_links: # get readable collections collections = api.collections().list( filters=[['uuid', 'in', [link['head_uuid'] for link in existing_links]]], select=["uuid", "owner_uuid", "name", "manifest_text"] ).execute(num_retries=args.retries)['items'] if collections: # check for repo+tag links on these collections if image_repo_tag: existing_repo_tag = _get_docker_links( api, args.retries, filters=[['link_class', '=', 'docker_image_repo+tag'], ['name', '=', image_repo_tag], ['head_uuid', 'in', [c["uuid"] for c in collections]]]) else: existing_repo_tag = [] try: coll_uuid = next(items_owned_by(parent_project_uuid, collections))['uuid'] except StopIteration: # create new collection owned by the project coll_uuid = api.collections().create( body={"manifest_text": collections[0]['manifest_text'], "name": collection_name, "owner_uuid": parent_project_uuid}, ensure_unique_name=True ).execute(num_retries=args.retries)['uuid'] link_base = {'owner_uuid': parent_project_uuid, 'head_uuid': coll_uuid, 'properties': existing_links[0]['properties']} if not any(items_owned_by(parent_project_uuid, existing_links)): # create image link owned by the project make_link(api, args.retries, 'docker_image_hash', image_hash, **link_base) if image_repo_tag and not any(items_owned_by(parent_project_uuid, existing_repo_tag)): # create repo+tag link owned by the project make_link(api, args.retries, 'docker_image_repo+tag', image_repo_tag, **link_base) stdout.write(coll_uuid + "\n") sys.exit(0) # Open a file for the saved image, and write it if needed. outfile_name = '{}.tar'.format(image_hash) image_file, need_save = prep_image_file(outfile_name) if need_save: save_image(image_hash, image_file) # Call arv-put with switches we inherited from it # (a.k.a., switches that aren't our own). put_args = keepdocker_parser.parse_known_args(arguments)[1] if args.name is None: put_args += ['--name', collection_name] coll_uuid = arv_put.main( put_args + ['--filename', outfile_name, image_file.name], stdout=stdout).strip() # Read the image metadata and make Arvados links from it. image_file.seek(0) image_tar = tarfile.open(fileobj=image_file) image_hash_type, _, raw_image_hash = image_hash.rpartition(':') if image_hash_type: json_filename = raw_image_hash + '.json' else: json_filename = raw_image_hash + '/json' json_file = image_tar.extractfile(image_tar.getmember(json_filename)) image_metadata = json.load(json_file) json_file.close() image_tar.close() link_base = {'head_uuid': coll_uuid, 'properties': {}} if 'created' in image_metadata: link_base['properties']['image_timestamp'] = image_metadata['created'] if args.project_uuid is not None: link_base['owner_uuid'] = args.project_uuid make_link(api, args.retries, 'docker_image_hash', image_hash, **link_base) if image_repo_tag: make_link(api, args.retries, 'docker_image_repo+tag', image_repo_tag, **link_base) # Clean up. image_file.close() for filename in [stat_cache_name(image_file), image_file.name]: try: os.unlink(filename) except OSError as error: if error.errno != errno.ENOENT: raise if __name__ == '__main__': main()