quay/image/docker/schema2/test/test_list.py

import json
import pytest

from image.docker.schema1 import DockerSchema1Manifest
from image.docker.schema2.manifest import DockerSchema2Manifest
from image.docker.schema2.list import (MalformedSchema2ManifestList, DockerSchema2ManifestList,
                                       DockerSchema2ManifestListBuilder)
from image.docker.schema2.test.test_manifest import MANIFEST_BYTES as v22_bytes
from image.docker.test.test_schema1 import MANIFEST_BYTES as v21_bytes

@pytest.mark.parametrize('json_data', [
  '',
  '{}',
  """
  {
    "unknown": "key"
  }
  """,
])
def test_malformed_manifest_lists(json_data):
  with pytest.raises(MalformedSchema2ManifestList):
    DockerSchema2ManifestList(json_data)


MANIFESTLIST_BYTES = json.dumps({
  "schemaVersion": 2,
  "mediaType": "application/vnd.docker.distribution.manifest.list.v2+json",
  "manifests": [
    {
      "mediaType": "application/vnd.docker.distribution.manifest.v2+json",
      "size": 946,
      "digest": "sha256:e6",
      "platform": {
        "architecture": "ppc64le",
        "os": "linux",
      }
    },
    {
      "mediaType": "application/vnd.docker.distribution.manifest.v1+json",
      "size": 878,
      "digest": "sha256:5b",
      "platform": {
        "architecture": "amd64",
        "os": "linux",
        "features": [
          "sse4"
        ]
      }
    }
  ]
})

NO_AMD_MANIFESTLIST_BYTES = json.dumps({
  "schemaVersion": 2,
  "mediaType": "application/vnd.docker.distribution.manifest.list.v2+json",
  "manifests": [
    {
      "mediaType": "application/vnd.docker.distribution.manifest.v2+json",
      "size": 946,
      "digest": "sha256:e6",
      "platform": {
        "architecture": "ppc64le",
        "os": "linux",
      }
    },
  ]
})

def test_valid_manifestlist():
  def _get_manifest(digest):
    if digest == 'sha256:e6':
      return v22_bytes
    else:
      return v21_bytes

  manifestlist = DockerSchema2ManifestList(MANIFESTLIST_BYTES)
  assert len(manifestlist.manifests(_get_manifest)) == 2

  assert manifestlist.media_type == 'application/vnd.docker.distribution.manifest.list.v2+json'
  assert manifestlist.bytes == MANIFESTLIST_BYTES
  assert manifestlist.manifest_dict == json.loads(MANIFESTLIST_BYTES)
  assert set(manifestlist.blob_digests) == {'sha256:e6', 'sha256:5b'}

  for index, manifest in enumerate(manifestlist.manifests(_get_manifest)):
    if index == 0:
      assert isinstance(manifest.manifest_obj, DockerSchema2Manifest)
      assert manifest.manifest_obj.schema_version == 2
    else:
      assert isinstance(manifest.manifest_obj, DockerSchema1Manifest)
      assert manifest.manifest_obj.schema_version == 1

  compatible_manifest = manifestlist.get_v1_compatible_manifest('foo', 'bar', 'baz', _get_manifest)
  assert compatible_manifest.schema_version == 1

  assert manifestlist.layers is None
  assert manifestlist.leaf_layer_v1_image_id is None
  assert manifestlist.legacy_image_ids is None


def test_get_v1_compatible_manifest_no_matching_list():
  def _get_manifest(digest):
    if digest == 'sha256:e6':
      return v22_bytes
    else:
      return v21_bytes

  manifestlist = DockerSchema2ManifestList(NO_AMD_MANIFESTLIST_BYTES)
  assert len(manifestlist.manifests(_get_manifest)) == 1

  assert manifestlist.media_type == 'application/vnd.docker.distribution.manifest.list.v2+json'
  assert manifestlist.bytes == NO_AMD_MANIFESTLIST_BYTES

  compatible_manifest = manifestlist.get_v1_compatible_manifest('foo', 'bar', 'baz', _get_manifest)
  assert compatible_manifest is None


def test_builder():
  def _get_manifest(digest):
    if digest == 'sha256:e6':
      return v22_bytes
    else:
      return v21_bytes

  existing = DockerSchema2ManifestList(MANIFESTLIST_BYTES)

  builder = DockerSchema2ManifestListBuilder()
  for index, manifest in enumerate(existing.manifests(_get_manifest)):
    builder.add_manifest(manifest.manifest_obj, "amd64", "os")

  built = builder.build()
  assert len(built.manifests(_get_manifest)) == 2