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Add schema2 manifest and schema2 config, along with tests

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This commit is contained in:
Joseph Schorr 2018-04-16 15:38:13 +03:00
parent 4bd70eab3c
commit 52b12131f7
6 changed files with 642 additions and 0 deletions
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5
image/docker/schema2.py → image/docker/schema2/__init__.py
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@ -8,6 +8,11 @@ https://github.com/docker/distribution/blob/master/docs/spec/manifest-v2-2.md
DOCKER_SCHEMA2_MANIFEST_CONTENT_TYPE = 'application/vnd.docker.distribution.manifest.v2+json'
DOCKER_SCHEMA2_MANIFESTLIST_CONTENT_TYPE = 'application/vnd.docker.distribution.manifest.list.v2+json'
DOCKER_SCHEMA2_LAYER_CONTENT_TYPE = 'application/vnd.docker.image.rootfs.diff.tar.gzip'
DOCKER_SCHEMA2_REMOTE_LAYER_CONTENT_TYPE = 'application/vnd.docker.image.rootfs.foreign.diff.tar.gzip'
DOCKER_SCHEMA2_CONFIG_CONTENT_TYPE = 'application/vnd.docker.container.image.v1+json'
OCI_MANIFEST_CONTENT_TYPE = 'application/vnd.oci.image.manifest.v1+json'
OCI_MANIFESTLIST_CONTENT_TYPE = 'application/vnd.oci.image.index.v1+json'

216
image/docker/schema2/config.py Normal file
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@ -0,0 +1,216 @@
"""
Implements validation and conversion for the Schema2 config JSON.
Example:
{
"architecture": "amd64",
"config": {
"Hostname": "",
"Domainname": "",
"User": "",
"AttachStdin": false,
"AttachStdout": false,
"AttachStderr": false,
"Tty": false,
"OpenStdin": false,
"StdinOnce": false,
"Env": [
"HTTP_PROXY=http:\/\/localhost:8080",
"http_proxy=http:\/\/localhost:8080",
"PATH=\/usr\/local\/sbin:\/usr\/local\/bin:\/usr\/sbin:\/usr\/bin:\/sbin:\/bin"
],
"Cmd": [
"sh"
],
"Image": "",
"Volumes": null,
"WorkingDir": "",
"Entrypoint": null,
"OnBuild": null,
"Labels": {
}
},
"container": "b7a43694b435c8e9932615643f61f975a9213e453b15cd6c2a386f144a2d2de9",
"container_config": {
"Hostname": "b7a43694b435",
"Domainname": "",
"User": "",
"AttachStdin": true,
"AttachStdout": true,
"AttachStderr": true,
"Tty": true,
"OpenStdin": true,
"StdinOnce": true,
"Env": [
"HTTP_PROXY=http:\/\/localhost:8080",
"http_proxy=http:\/\/localhost:8080",
"PATH=\/usr\/local\/sbin:\/usr\/local\/bin:\/usr\/sbin:\/usr\/bin:\/sbin:\/bin"
],
"Cmd": [
"sh"
],
"Image": "somenamespace\/somerepo",
"Volumes": null,
"WorkingDir": "",
"Entrypoint": null,
"OnBuild": null,
"Labels": {
}
},
"created": "2018-04-16T10:41:19.079522722Z",
"docker_version": "17.09.0-ce",
"history": [
{
"created": "2018-04-03T18:37:09.284840891Z",
"created_by": "\/bin\/sh -c #(nop) ADD file:9e4ca21cbd24dc05b454b6be21c7c639216ae66559b21ba24af0d665c62620dc in \/ "
},
{
"created": "2018-04-03T18:37:09.613317719Z",
"created_by": "\/bin\/sh -c #(nop) CMD [\"sh\"]",
"empty_layer": true
},
{
"created": "2018-04-16T10:37:44.418262777Z",
"created_by": "sh"
},
{
"created": "2018-04-16T10:41:19.079522722Z",
"created_by": "sh"
}
],
"os": "linux",
"rootfs": {
"type": "layers",
"diff_ids": [
"sha256:3e596351c689c8827a3c9635bc1083cff17fa4a174f84f0584bd0ae6f384195b",
"sha256:4552be273c71275a88de0b8c8853dcac18cb74d5790f5383d9b38d4ac55062d5",
"sha256:1319c76152ca37fbeb7fb71e0ffa7239bc19ffbe3b95c00417ece39d89d06e6e"
]
}
}
"""
import copy
import json
from collections import namedtuple
from jsonschema import validate as validate_schema, ValidationError
from dateutil.parser import parse as parse_date
DOCKER_SCHEMA2_CONFIG_HISTORY_KEY = "history"
DOCKER_SCHEMA2_CONFIG_ROOTFS_KEY = "rootfs"
DOCKER_SCHEMA2_CONFIG_CREATED_KEY = "created"
DOCKER_SCHEMA2_CONFIG_CREATED_BY_KEY = "created_by"
DOCKER_SCHEMA2_CONFIG_EMPTY_LAYER_KEY = "empty_layer"
DOCKER_SCHEMA2_CONFIG_TYPE_KEY = "type"
LayerHistory = namedtuple('LayerHistory', ['created', 'created_datetime', 'command', 'is_empty'])
class MalformedSchema2Config(Exception):
"""
Raised when a config fails an assertion that should be true according to the Docker Manifest
v2.2 Config Specification.
"""
pass
class DockerSchema2Config(object):
METASCHEMA = {
'type': 'object',
'description': 'The container configuration found in a schema 2 manifest',
'required': [DOCKER_SCHEMA2_CONFIG_HISTORY_KEY, DOCKER_SCHEMA2_CONFIG_ROOTFS_KEY],
'properties': {
DOCKER_SCHEMA2_CONFIG_HISTORY_KEY: {
'type': 'array',
'description': 'The history used to create the container image',
'items': {
'type': 'object',
'properties': {
DOCKER_SCHEMA2_CONFIG_EMPTY_LAYER_KEY: {
'type': 'boolean',
'description': 'If present, this layer is empty',
},
DOCKER_SCHEMA2_CONFIG_CREATED_KEY: {
'type': 'string',
'description': 'The date/time that the layer was created',
'format': 'date-time',
'x-example': '2018-04-03T18:37:09.284840891Z',
},
DOCKER_SCHEMA2_CONFIG_CREATED_BY_KEY: {
'type': 'string',
'description': 'The command used to create the layer',
'x-example': '\/bin\/sh -c #(nop) ADD file:somesha in /',
},
},
'required': [DOCKER_SCHEMA2_CONFIG_CREATED_KEY, DOCKER_SCHEMA2_CONFIG_CREATED_BY_KEY],
'additionalProperties': True,
},
},
DOCKER_SCHEMA2_CONFIG_ROOTFS_KEY: {
'type': 'object',
'description': 'Describes the root filesystem for this image',
'properties': {
DOCKER_SCHEMA2_CONFIG_TYPE_KEY: {
'type': 'string',
'description': 'The type of the root file system entries',
},
},
'required': [DOCKER_SCHEMA2_CONFIG_TYPE_KEY],
'additionalProperties': True,
},
},
'additionalProperties': True,
}
def __init__(self, config_bytes):
try:
self._parsed = json.loads(config_bytes)
except ValueError as ve:
raise MalformedSchema2Config('malformed config data: %s' % ve)
try:
validate_schema(self._parsed, DockerSchema2Config.METASCHEMA)
except ValidationError as ve:
raise MalformedSchema2Config('config data does not match schema: %s' % ve)
@property
def history(self):
""" Returns the history of the image, started at the base layer. """
for history_entry in self._parsed[DOCKER_SCHEMA2_CONFIG_HISTORY_KEY]:
created_datetime = parse_date(history_entry[DOCKER_SCHEMA2_CONFIG_CREATED_KEY])
yield LayerHistory(created_datetime=created_datetime,
created=history_entry[DOCKER_SCHEMA2_CONFIG_CREATED_KEY],
command=history_entry[DOCKER_SCHEMA2_CONFIG_CREATED_BY_KEY],
is_empty=history_entry.get(DOCKER_SCHEMA2_CONFIG_EMPTY_LAYER_KEY, False))
def build_v1_compatibility(self, layer_index, v1_id, v1_parent_id):
""" Builds the V1 compatibility block for the given layer.
Note that the layer_index is 0-indexed, with the *base* layer being 0, and the leaf
layer being last.
"""
history = list(self.history)
# If the layer is the leaf, it gets the full config (minus 2 fields). Otherwise, it gets only
# IDs.
v1_compatibility = copy.deepcopy(self._parsed) if layer_index == len(history) - 1 else {}
v1_compatibility['id'] = v1_id
if v1_parent_id is not None:
v1_compatibility['parent'] = v1_parent_id
if 'created' not in v1_compatibility:
v1_compatibility['created'] = history[layer_index].created
if 'container_config' not in v1_compatibility:
v1_compatibility['container_config'] = {
'Cmd': history[layer_index].command,
}
# The history and rootfs keys are schema2-config specific.
v1_compatibility.pop(DOCKER_SCHEMA2_CONFIG_HISTORY_KEY, None)
v1_compatibility.pop(DOCKER_SCHEMA2_CONFIG_ROOTFS_KEY, None)
return v1_compatibility

205
image/docker/schema2/manifest.py Normal file
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@ -0,0 +1,205 @@
import json
import logging
import hashlib
from collections import namedtuple
from jsonschema import validate as validate_schema, ValidationError
from digest import digest_tools
from image.docker import ManifestException
from image.docker.schema2 import (DOCKER_SCHEMA2_MANIFEST_CONTENT_TYPE,
DOCKER_SCHEMA2_CONFIG_CONTENT_TYPE,
DOCKER_SCHEMA2_LAYER_CONTENT_TYPE,
DOCKER_SCHEMA2_REMOTE_LAYER_CONTENT_TYPE)
from image.docker.schema2.config import DockerSchema2Config
# Keys.
DOCKER_SCHEMA2_MANIFEST_VERSION_KEY = 'schemaVersion'
DOCKER_SCHEMA2_MANIFEST_MEDIATYPE_KEY = 'mediaType'
DOCKER_SCHEMA2_MANIFEST_CONFIG_KEY = 'config'
DOCKER_SCHEMA2_MANIFEST_SIZE_KEY = 'size'
DOCKER_SCHEMA2_MANIFEST_DIGEST_KEY = 'digest'
DOCKER_SCHEMA2_MANIFEST_LAYERS_KEY = 'layers'
DOCKER_SCHEMA2_MANIFEST_URLS_KEY = 'urls'
# Named tuples.
DockerV2ManifestConfig = namedtuple('DockerV2ManifestConfig', ['size', 'digest'])
DockerV2ManifestLayer = namedtuple('DockerV2ManifestLayer', ['index', 'size', 'digest',
'is_remote', 'urls'])
LayerWithV1ID = namedtuple('LayerWithV1ID', ['layer', 'v1_id', 'v1_parent_id'])
logger = logging.getLogger(__name__)
class MalformedSchema2Manifest(ManifestException):
"""
Raised when a manifest fails an assertion that should be true according to the Docker Manifest
v2.2 Specification.
"""
pass
class DockerSchema2Manifest(object):
METASCHEMA = {
'type': 'object',
'properties': {
DOCKER_SCHEMA2_MANIFEST_VERSION_KEY: {
'type': 'number',
'description': 'The version of the schema. Must always be `2`.',
'minimum': 2,
'maximum': 2,
},
DOCKER_SCHEMA2_MANIFEST_MEDIATYPE_KEY: {
'type': 'string',
'description': 'The media type of the schema.',
'enum': [DOCKER_SCHEMA2_MANIFEST_CONTENT_TYPE],
},
DOCKER_SCHEMA2_MANIFEST_CONFIG_KEY: {
'type': 'object',
'description': 'The config field references a configuration object for a container, ' +
'by digest. This configuration item is a JSON blob that the runtime ' +
'uses to set up the container.',
'properties': {
DOCKER_SCHEMA2_MANIFEST_MEDIATYPE_KEY: {
'type': 'string',
'description': 'The MIME type of the referenced object. This should generally be ' +
'application/vnd.docker.container.image.v1+json',
'enum': [DOCKER_SCHEMA2_CONFIG_CONTENT_TYPE],
},
DOCKER_SCHEMA2_MANIFEST_SIZE_KEY: {
'type': 'number',
'description': 'The size in bytes of the object. This field exists so that a ' +
'client will have an expected size for the content before ' +
'validating. If the length of the retrieved content does not ' +
'match the specified length, the content should not be trusted.',
},
DOCKER_SCHEMA2_MANIFEST_DIGEST_KEY: {
'type': 'string',
'description': 'The content addressable digest of the config in the blob store',
},
},
'required': [DOCKER_SCHEMA2_MANIFEST_MEDIATYPE_KEY, DOCKER_SCHEMA2_MANIFEST_SIZE_KEY,
DOCKER_SCHEMA2_MANIFEST_DIGEST_KEY],
},
DOCKER_SCHEMA2_MANIFEST_LAYERS_KEY: {
'type': 'array',
'description': 'The layer list is ordered starting from the base ' +
'image (opposite order of schema1).',
'items': {
'type': 'object',
'properties': {
DOCKER_SCHEMA2_MANIFEST_MEDIATYPE_KEY: {
'type': 'string',
'description': 'The MIME type of the referenced object. This should generally be ' +
'application/vnd.docker.image.rootfs.diff.tar.gzip. Layers of type ' +
'application/vnd.docker.image.rootfs.foreign.diff.tar.gzip may be ' +
'pulled from a remote location but they should never be pushed.',
'enum': [DOCKER_SCHEMA2_LAYER_CONTENT_TYPE, DOCKER_SCHEMA2_REMOTE_LAYER_CONTENT_TYPE],
},
DOCKER_SCHEMA2_MANIFEST_SIZE_KEY: {
'type': 'number',
'description': 'The size in bytes of the object. This field exists so that a ' +
'client will have an expected size for the content before ' +
'validating. If the length of the retrieved content does not ' +
'match the specified length, the content should not be trusted.',
},
DOCKER_SCHEMA2_MANIFEST_DIGEST_KEY: {
'type': 'string',
'description': 'The content addressable digest of the layer in the blob store',
},
},
'required': [
DOCKER_SCHEMA2_MANIFEST_MEDIATYPE_KEY, DOCKER_SCHEMA2_MANIFEST_SIZE_KEY,
DOCKER_SCHEMA2_MANIFEST_DIGEST_KEY,
],
},
},
},
'required': [DOCKER_SCHEMA2_MANIFEST_VERSION_KEY, DOCKER_SCHEMA2_MANIFEST_MEDIATYPE_KEY,
DOCKER_SCHEMA2_MANIFEST_CONFIG_KEY, DOCKER_SCHEMA2_MANIFEST_LAYERS_KEY],
}
def __init__(self, manifest_bytes):
self._layers = None
try:
self._parsed = json.loads(manifest_bytes)
except ValueError as ve:
raise MalformedSchema2Manifest('malformed manifest data: %s' % ve)
try:
validate_schema(self._parsed, DockerSchema2Manifest.METASCHEMA)
except ValidationError as ve:
raise MalformedSchema2Manifest('manifest data does not match schema: %s' % ve)
@property
def config(self):
config = self._parsed[DOCKER_SCHEMA2_MANIFEST_CONFIG_KEY]
return DockerV2ManifestConfig(size=config[DOCKER_SCHEMA2_MANIFEST_SIZE_KEY],
digest=config[DOCKER_SCHEMA2_MANIFEST_DIGEST_KEY])
@property
def layers(self):
""" Returns the layers of this manifest, from base to leaf. """
if self._layers is None:
self._layers = list(self._generate_layers())
return self._layers
@property
def leaf_layer(self):
return self.layers[-1]
def _generate_layers(self):
for index, layer in enumerate(self._parsed[DOCKER_SCHEMA2_MANIFEST_LAYERS_KEY]):
content_type = layer[DOCKER_SCHEMA2_MANIFEST_MEDIATYPE_KEY]
is_remote = content_type == DOCKER_SCHEMA2_REMOTE_LAYER_CONTENT_TYPE
try:
digest = digest_tools.Digest.parse_digest(layer[DOCKER_SCHEMA2_MANIFEST_DIGEST_KEY])
except digest_tools.InvalidDigestException:
raise MalformedSchema2Manifest('could not parse manifest digest: %s' %
layer[DOCKER_SCHEMA2_MANIFEST_DIGEST_KEY])
yield DockerV2ManifestLayer(index=index,
size=layer[DOCKER_SCHEMA2_MANIFEST_SIZE_KEY],
digest=digest,
is_remote=is_remote,
urls=layer.get(DOCKER_SCHEMA2_MANIFEST_URLS_KEY))
@property
def layers_with_v1_ids(self):
digest_history = hashlib.sha256()
v1_layer_parent_id = None
v1_layer_id = None
for layer in self.layers:
v1_layer_parent_id = v1_layer_id
# Create a new synthesized V1 ID for the layer by adding its digest and index to the
# existing digest history hash builder. This will ensure unique V1s across *all* schemas in
# a repository.
digest_history.update(str(layer.digest))
digest_history.update("#")
digest_history.update(str(layer.index))
digest_history.update("|")
v1_layer_id = digest_history.hexdigest()
yield LayerWithV1ID(layer=layer, v1_id=v1_layer_id, v1_parent_id=v1_layer_parent_id)
def populate_schema1_builder(self, v1_builder, lookup_config_fn):
""" Populates a DockerSchema1ManifestBuilder with the layers and config from
this schema. The `lookup_config_fn` is a function that, when given the config
digest SHA, returns the associated configuration JSON bytes for this schema.
"""
config_bytes = lookup_config_fn(self.config.digest)
schema2_config = DockerSchema2Config(config_bytes)
# Build the V1 IDs for the layers.
layers = list(self.layers_with_v1_ids)
for layer_with_ids in reversed(layers): # Schema1 has layers in reverse order
v1_compatibility = schema2_config.build_v1_compatibility(layer_with_ids.layer.index,
layer_with_ids.v1_id,
layer_with_ids.v1_parent_id)
v1_builder.add_layer(str(layer_with_ids.layer.digest), json.dumps(v1_compatibility))
return v1_builder

0
image/docker/schema2/test/__init__.py Normal file
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129
image/docker/schema2/test/test_config.py Normal file
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@ -0,0 +1,129 @@
import json
import pytest
from image.docker.schema2.config import MalformedSchema2Config, DockerSchema2Config
@pytest.mark.parametrize('json_data', [
'',
'{}',
"""
{
"unknown": "key"
}
""",
])
def test_malformed_configs(json_data):
with pytest.raises(MalformedSchema2Config):
DockerSchema2Config(json_data)
CONFIG_BYTES = json.dumps({
"architecture": "amd64",
"config": {
"Hostname": "",
"Domainname": "",
"User": "",
"AttachStdin": False,
"AttachStdout": False,
"AttachStderr": False,
"Tty": False,
"OpenStdin": False,
"StdinOnce": False,
"Env": [
"HTTP_PROXY=http:\/\/localhost:8080",
"http_proxy=http:\/\/localhost:8080",
"PATH=\/usr\/local\/sbin:\/usr\/local\/bin:\/usr\/sbin:\/usr\/bin:\/sbin:\/bin"
],
"Cmd": [
"sh"
],
"Image": "",
"Volumes": None,
"WorkingDir": "",
"Entrypoint": None,
"OnBuild": None,
"Labels": {
}
},
"container": "b7a43694b435c8e9932615643f61f975a9213e453b15cd6c2a386f144a2d2de9",
"container_config": {
"Hostname": "b7a43694b435",
"Domainname": "",
"User": "",
"AttachStdin": True,
"AttachStdout": True,
"AttachStderr": True,
"Tty": True,
"OpenStdin": True,
"StdinOnce": True,
"Env": [
"HTTP_PROXY=http:\/\/localhost:8080",
"http_proxy=http:\/\/localhost:8080",
"PATH=\/usr\/local\/sbin:\/usr\/local\/bin:\/usr\/sbin:\/usr\/bin:\/sbin:\/bin"
],
"Cmd": [
"sh"
],
"Image": "jschorr\/somerepo",
"Volumes": None,
"WorkingDir": "",
"Entrypoint": None,
"OnBuild": None,
"Labels": {
}
},
"created": "2018-04-16T10:41:19.079522722Z",
"docker_version": "17.09.0-ce",
"history": [
{
"created": "2018-04-03T18:37:09.284840891Z",
"created_by": "\/bin\/sh -c #(nop) ADD file:9e4ca21cbd24dc05b454b6be21c7c639216ae66559b21ba24af0d665c62620dc in \/ "
},
{
"created": "2018-04-03T18:37:09.613317719Z",
"created_by": "/bin/sh -c #(nop) CMD [\"sh\"]",
"empty_layer": True
},
{
"created": "2018-04-16T10:37:44.418262777Z",
"created_by": "sh"
},
{
"created": "2018-04-16T10:41:19.079522722Z",
"created_by": "sh"
}
],
"os": "linux",
"rootfs": {
"type": "layers",
"diff_ids": [
"sha256:3e596351c689c8827a3c9635bc1083cff17fa4a174f84f0584bd0ae6f384195b",
"sha256:4552be273c71275a88de0b8c8853dcac18cb74d5790f5383d9b38d4ac55062d5",
"sha256:1319c76152ca37fbeb7fb71e0ffa7239bc19ffbe3b95c00417ece39d89d06e6e"
]
}
})
def test_valid_config():
config = DockerSchema2Config(CONFIG_BYTES)
history = list(config.history)
assert len(history) == 4
assert not history[0].is_empty
assert history[1].is_empty
assert history[0].created_datetime.year == 2018
assert history[1].command == '/bin/sh -c #(nop) CMD ["sh"]'
assert history[2].command == 'sh'
for index, history_entry in enumerate(history):
v1_compat = config.build_v1_compatibility(index, 'somev1id', 'someparentid')
assert v1_compat['id'] == 'somev1id'
assert v1_compat['parent'] == 'someparentid'
if index == 3:
assert v1_compat['container_config'] == config._parsed['container_config']
else:
assert 'Hostname' not in v1_compat['container_config']
assert v1_compat['container_config']['Cmd'] == history_entry.command

87
image/docker/schema2/test/test_manifest.py Normal file
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import json
import pytest
from app import docker_v2_signing_key
from image.docker.schema1 import DockerSchema1ManifestBuilder
from image.docker.schema2.manifest import MalformedSchema2Manifest, DockerSchema2Manifest
from image.docker.schema2.test.test_config import CONFIG_BYTES
@pytest.mark.parametrize('json_data', [
'',
'{}',
"""
{
"unknown": "key"
}
""",
])
def test_malformed_manifests(json_data):
with pytest.raises(MalformedSchema2Manifest):
DockerSchema2Manifest(json_data)
MANIFEST_BYTES = json.dumps({
"schemaVersion": 2,
"mediaType": "application/vnd.docker.distribution.manifest.v2+json",
"config": {
"mediaType": "application/vnd.docker.container.image.v1+json",
"size": 7023,
"digest": "sha256:b5b2b2c507a0944348e0303114d8d93aaaa081732b86451d9bce1f432a537bc7"
},
"layers": [
{
"mediaType": "application/vnd.docker.image.rootfs.foreign.diff.tar.gzip",
"size": 1234,
"digest": "sha256:ec4b8955958665577945c89419d1af06b5f7636b4ac3da7f12184802ad867736",
"urls": ['http://some/url'],
},
{
"mediaType": "application/vnd.docker.image.rootfs.diff.tar.gzip",
"size": 32654,
"digest": "sha256:e692418e4cbaf90ca69d05a66403747baa33ee08806650b51fab815ad7fc331f"
},
{
"mediaType": "application/vnd.docker.image.rootfs.diff.tar.gzip",
"size": 16724,
"digest": "sha256:3c3a4604a545cdc127456d94e421cd355bca5b528f4a9c1905b15da2eb4a4c6b"
},
{
"mediaType": "application/vnd.docker.image.rootfs.diff.tar.gzip",
"size": 73109,
"digest": "sha256:ec4b8955958665577945c89419d1af06b5f7636b4ac3da7f12184802ad867736"
},
],
})
def test_valid_manifest():
manifest = DockerSchema2Manifest(MANIFEST_BYTES)
assert manifest.config.size == 7023
assert str(manifest.config.digest) == 'sha256:b5b2b2c507a0944348e0303114d8d93aaaa081732b86451d9bce1f432a537bc7'
assert len(manifest.layers) == 4
assert manifest.layers[0].is_remote
assert manifest.layers[0].size == 1234
assert str(manifest.layers[0].digest) == 'sha256:ec4b8955958665577945c89419d1af06b5f7636b4ac3da7f12184802ad867736'
assert manifest.layers[0].urls
assert manifest.leaf_layer == manifest.layers[3]
assert not manifest.leaf_layer.is_remote
assert manifest.leaf_layer.size == 73109
def test_build_schema1():
manifest = DockerSchema2Manifest(MANIFEST_BYTES)
builder = DockerSchema1ManifestBuilder('somenamespace', 'somename', 'sometag')
manifest.populate_schema1_builder(builder, lambda digest: CONFIG_BYTES)
schema1 = builder.build(docker_v2_signing_key)
assert len(schema1.layers) == len(manifest.layers)
assert set(schema1.image_ids) == set([l.v1_id for l in manifest.layers_with_v1_ids])
assert set(schema1.parent_image_ids) == set([l.v1_parent_id for l in manifest.layers_with_v1_ids if l.v1_parent_id])
manifest_layers = list(manifest.layers_with_v1_ids)
for index, layer in enumerate(schema1.layers):
assert layer.digest == manifest_layers[index].layer.digest
assert layer.v1_metadata.image_id == manifest_layers[index].v1_id
assert layer.v1_metadata.parent_image_id == manifest_layers[index].v1_parent_id