317 lines
12 KiB
Python
317 lines
12 KiB
Python
import logging
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import json
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from cachetools import lru_cache
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from jsonschema import validate as validate_schema, ValidationError
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from digest import digest_tools
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from image.docker import ManifestException
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from image.docker.interfaces import ManifestInterface
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from image.docker.schema1 import DOCKER_SCHEMA1_MANIFEST_CONTENT_TYPE
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from image.docker.schema1 import DockerSchema1Manifest
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from image.docker.schema2 import (DOCKER_SCHEMA2_MANIFESTLIST_CONTENT_TYPE,
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DOCKER_SCHEMA2_MANIFEST_CONTENT_TYPE)
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from image.docker.schema2.manifest import DockerSchema2Manifest
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logger = logging.getLogger(__name__)
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# Keys.
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DOCKER_SCHEMA2_MANIFESTLIST_VERSION_KEY = 'schemaVersion'
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DOCKER_SCHEMA2_MANIFESTLIST_MEDIATYPE_KEY = 'mediaType'
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DOCKER_SCHEMA2_MANIFESTLIST_SIZE_KEY = 'size'
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DOCKER_SCHEMA2_MANIFESTLIST_DIGEST_KEY = 'digest'
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DOCKER_SCHEMA2_MANIFESTLIST_MANIFESTS_KEY = 'manifests'
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DOCKER_SCHEMA2_MANIFESTLIST_PLATFORM_KEY = 'platform'
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DOCKER_SCHEMA2_MANIFESTLIST_ARCHITECTURE_KEY = 'architecture'
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DOCKER_SCHEMA2_MANIFESTLIST_OS_KEY = 'os'
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DOCKER_SCHEMA2_MANIFESTLIST_OS_VERSION_KEY = 'os.version'
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DOCKER_SCHEMA2_MANIFESTLIST_OS_FEATURES_KEY = 'os.features'
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DOCKER_SCHEMA2_MANIFESTLIST_FEATURES_KEY = 'features'
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DOCKER_SCHEMA2_MANIFESTLIST_VARIANT_KEY = 'variant'
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class MalformedSchema2ManifestList(Exception):
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"""
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Raised when a manifest list fails an assertion that should be true according to the
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Docker Manifest v2.2 Specification.
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"""
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pass
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class LazyManifestLoader(object):
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def __init__(self, manifest_data, content_retriever):
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self._manifest_data = manifest_data
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self._content_retriever = content_retriever
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self._loaded_manifest = None
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@property
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def manifest_obj(self):
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if self._loaded_manifest is not None:
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return self._loaded_manifest
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self._loaded_manifest = self._load_manifest()
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return self._loaded_manifest
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def _load_manifest(self):
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digest = self._manifest_data[DOCKER_SCHEMA2_MANIFESTLIST_DIGEST_KEY]
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size = self._manifest_data[DOCKER_SCHEMA2_MANIFESTLIST_SIZE_KEY]
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manifest_bytes = self._content_retriever.get_manifest_bytes_with_digest(digest)
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if manifest_bytes is None:
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raise MalformedSchema2ManifestList('Could not find child manifest with digest `%s`' % digest)
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if len(manifest_bytes) != size:
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raise MalformedSchema2ManifestList('Size of manifest does not match that retrieved: %s vs %s',
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len(manifest_bytes), size)
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content_type = self._manifest_data[DOCKER_SCHEMA2_MANIFESTLIST_MEDIATYPE_KEY]
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if content_type == DOCKER_SCHEMA2_MANIFEST_CONTENT_TYPE:
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return DockerSchema2Manifest(manifest_bytes)
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if content_type == DOCKER_SCHEMA1_MANIFEST_CONTENT_TYPE:
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return DockerSchema1Manifest(manifest_bytes, validate=False)
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raise MalformedSchema2ManifestList('Unknown manifest content type')
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class DockerSchema2ManifestList(ManifestInterface):
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METASCHEMA = {
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'type': 'object',
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'properties': {
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DOCKER_SCHEMA2_MANIFESTLIST_VERSION_KEY: {
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'type': 'number',
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'description': 'The version of the manifest list. Must always be `2`.',
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'minimum': 2,
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'maximum': 2,
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},
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DOCKER_SCHEMA2_MANIFESTLIST_MEDIATYPE_KEY: {
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'type': 'string',
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'description': 'The media type of the manifest list.',
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'enum': [DOCKER_SCHEMA2_MANIFESTLIST_CONTENT_TYPE],
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},
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DOCKER_SCHEMA2_MANIFESTLIST_MANIFESTS_KEY: {
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'type': 'array',
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'description': 'The manifests field contains a list of manifests for specific platforms',
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'items': {
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'type': 'object',
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'properties': {
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DOCKER_SCHEMA2_MANIFESTLIST_MEDIATYPE_KEY: {
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'type': 'string',
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'description': 'The MIME type of the referenced object. This will generally be ' +
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'application/vnd.docker.distribution.manifest.v2+json, but it ' +
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'could also be application/vnd.docker.distribution.manifest.v1+json ' +
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'if the manifest list references a legacy schema-1 manifest.',
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'enum': [DOCKER_SCHEMA2_MANIFEST_CONTENT_TYPE, DOCKER_SCHEMA1_MANIFEST_CONTENT_TYPE],
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},
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DOCKER_SCHEMA2_MANIFESTLIST_SIZE_KEY: {
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'type': 'number',
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'description': 'The size in bytes of the object. This field exists so that a ' +
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'client will have an expected size for the content before ' +
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'validating. If the length of the retrieved content does not ' +
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'match the specified length, the content should not be trusted.',
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},
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DOCKER_SCHEMA2_MANIFESTLIST_DIGEST_KEY: {
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'type': 'string',
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'description': 'The content addressable digest of the manifest in the blob store',
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},
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DOCKER_SCHEMA2_MANIFESTLIST_PLATFORM_KEY: {
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'type': 'object',
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'description': 'The platform object describes the platform which the image in ' +
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'the manifest runs on',
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'properties': {
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DOCKER_SCHEMA2_MANIFESTLIST_ARCHITECTURE_KEY: {
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'type': 'string',
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'description': 'Specifies the CPU architecture, for example amd64 or ppc64le.',
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},
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DOCKER_SCHEMA2_MANIFESTLIST_OS_KEY: {
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'type': 'string',
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'description': 'Specifies the operating system, for example linux or windows',
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},
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DOCKER_SCHEMA2_MANIFESTLIST_OS_VERSION_KEY: {
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'type': 'string',
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'description': 'Specifies the operating system version, for example 10.0.10586',
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},
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DOCKER_SCHEMA2_MANIFESTLIST_OS_FEATURES_KEY: {
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'type': 'array',
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'description': 'specifies an array of strings, each listing a required OS ' +
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'feature (for example on Windows win32k)',
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'items': {
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'type': 'string',
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},
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},
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DOCKER_SCHEMA2_MANIFESTLIST_VARIANT_KEY: {
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'type': 'string',
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'description': 'Specifies a variant of the CPU, for example armv6l to specify ' +
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'a particular CPU variant of the ARM CPU',
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},
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DOCKER_SCHEMA2_MANIFESTLIST_FEATURES_KEY: {
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'type': 'array',
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'description': 'specifies an array of strings, each listing a required CPU ' +
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'feature (for example sse4 or aes).',
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'items': {
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'type': 'string',
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},
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},
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},
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'required': [DOCKER_SCHEMA2_MANIFESTLIST_ARCHITECTURE_KEY,
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DOCKER_SCHEMA2_MANIFESTLIST_OS_KEY],
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},
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},
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'required': [DOCKER_SCHEMA2_MANIFESTLIST_MEDIATYPE_KEY,
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DOCKER_SCHEMA2_MANIFESTLIST_SIZE_KEY,
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DOCKER_SCHEMA2_MANIFESTLIST_DIGEST_KEY,
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DOCKER_SCHEMA2_MANIFESTLIST_PLATFORM_KEY],
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},
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},
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},
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'required': [DOCKER_SCHEMA2_MANIFESTLIST_VERSION_KEY,
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DOCKER_SCHEMA2_MANIFESTLIST_MEDIATYPE_KEY,
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DOCKER_SCHEMA2_MANIFESTLIST_MANIFESTS_KEY],
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}
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def __init__(self, manifest_bytes):
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self._layers = None
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self._manifest_bytes = manifest_bytes
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try:
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self._parsed = json.loads(manifest_bytes)
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except ValueError as ve:
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raise MalformedSchema2ManifestList('malformed manifest data: %s' % ve)
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try:
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validate_schema(self._parsed, DockerSchema2ManifestList.METASCHEMA)
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except ValidationError as ve:
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raise MalformedSchema2ManifestList('manifest data does not match schema: %s' % ve)
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@property
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def is_manifest_list(self):
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""" Returns whether this manifest is a list. """
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return True
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@property
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def schema_version(self):
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return 2
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@property
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def digest(self):
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""" The digest of the manifest, including type prefix. """
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return digest_tools.sha256_digest(self._manifest_bytes)
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@property
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def media_type(self):
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""" The media type of the schema. """
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return self._parsed[DOCKER_SCHEMA2_MANIFESTLIST_MEDIATYPE_KEY]
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@property
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def manifest_dict(self):
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""" Returns the manifest as a dictionary ready to be serialized to JSON. """
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return self._parsed
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@property
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def bytes(self):
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return self._manifest_bytes
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@property
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def layers(self):
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return None
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@property
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def leaf_layer_v1_image_id(self):
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return None
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@property
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def legacy_image_ids(self):
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return None
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@property
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def blob_digests(self):
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manifests = self._parsed[DOCKER_SCHEMA2_MANIFESTLIST_MANIFESTS_KEY]
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return [m[DOCKER_SCHEMA2_MANIFESTLIST_DIGEST_KEY] for m in manifests]
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@property
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def local_blob_digests(self):
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return self.blob_digests
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@property
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def layers_compressed_size(self):
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return None
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@lru_cache(maxsize=1)
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def manifests(self, content_retriever):
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""" Returns the manifests in the list.
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"""
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manifests = self._parsed[DOCKER_SCHEMA2_MANIFESTLIST_MANIFESTS_KEY]
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return [LazyManifestLoader(m, content_retriever) for m in manifests]
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def child_manifests(self, content_retriever):
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return self.manifests(content_retriever)
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def get_manifest_labels(self, content_retriever):
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return None
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def get_v1_compatible_manifest(self, namespace_name, repo_name, tag_name, content_retriever):
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""" Returns the manifest that is compatible with V1, by virtue of being `amd64` and `linux`.
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If none, returns None.
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"""
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for manifest_ref in self.manifests(content_retriever):
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platform = manifest_ref._manifest_data[DOCKER_SCHEMA2_MANIFESTLIST_PLATFORM_KEY]
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architecture = platform[DOCKER_SCHEMA2_MANIFESTLIST_ARCHITECTURE_KEY]
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os = platform[DOCKER_SCHEMA2_MANIFESTLIST_OS_KEY]
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if architecture != 'amd64' or os != 'linux':
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continue
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try:
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manifest = manifest_ref.manifest_obj
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except (ManifestException, IOError):
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logger.exception('Could not load child manifest')
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return None
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return manifest.get_v1_compatible_manifest(namespace_name, repo_name, tag_name,
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content_retriever)
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return None
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def unsigned(self):
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return self
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def generate_legacy_layers(self, images_map, content_retriever):
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return None
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class DockerSchema2ManifestListBuilder(object):
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"""
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A convenient abstraction around creating new DockerSchema2ManifestList's.
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"""
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def __init__(self):
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self.manifests = []
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def add_manifest(self, manifest, architecture, os):
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""" Adds a manifest to the list. """
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manifest = manifest.unsigned() # Make sure we add the unsigned version to the list.
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self.add_manifest_digest(manifest.digest, len(manifest.bytes), manifest.media_type,
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architecture, os)
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def add_manifest_digest(self, manifest_digest, manifest_size, media_type, architecture, os):
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""" Adds a manifest to the list. """
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self.manifests.append((manifest_digest, manifest_size, media_type, {
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DOCKER_SCHEMA2_MANIFESTLIST_ARCHITECTURE_KEY: architecture,
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DOCKER_SCHEMA2_MANIFESTLIST_OS_KEY: os,
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}))
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def build(self):
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""" Builds and returns the DockerSchema2ManifestList. """
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assert self.manifests
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manifest_list_dict = {
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DOCKER_SCHEMA2_MANIFESTLIST_VERSION_KEY: 2,
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DOCKER_SCHEMA2_MANIFESTLIST_MEDIATYPE_KEY: DOCKER_SCHEMA2_MANIFESTLIST_CONTENT_TYPE,
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DOCKER_SCHEMA2_MANIFESTLIST_MANIFESTS_KEY: [
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{
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DOCKER_SCHEMA2_MANIFESTLIST_MEDIATYPE_KEY: manifest[2],
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DOCKER_SCHEMA2_MANIFESTLIST_DIGEST_KEY: manifest[0],
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DOCKER_SCHEMA2_MANIFESTLIST_SIZE_KEY: manifest[1],
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DOCKER_SCHEMA2_MANIFESTLIST_PLATFORM_KEY: manifest[3],
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} for manifest in self.manifests
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],
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}
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return DockerSchema2ManifestList(json.dumps(manifest_list_dict, indent=3))
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