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

import json
import pytest

from app import docker_v2_signing_key
from image.docker.schema1 import (DockerSchema1ManifestBuilder,
                                  DOCKER_SCHEMA1_SIGNED_MANIFEST_CONTENT_TYPE)
from image.docker.schema2.manifest import (MalformedSchema2Manifest, DockerSchema2Manifest,
                                           DockerSchema2ManifestBuilder)
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": 1885,
    "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 == 1885
  assert str(manifest.config.digest) == 'sha256:b5b2b2c507a0944348e0303114d8d93aaaa081732b86451d9bce1f432a537bc7'
  assert manifest.media_type == "application/vnd.docker.distribution.manifest.v2+json"

  assert len(manifest.layers) == 4
  assert manifest.layers[0].is_remote
  assert manifest.layers[0].compressed_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.compressed_size == 73109

  blob_digests = list(manifest.blob_digests)
  assert len(blob_digests) == len(manifest.layers) + 1

  expected = [str(layer.digest) for layer in manifest.layers] + [manifest.config.digest]
  assert blob_digests == expected


def test_schema2_builder():
  manifest = DockerSchema2Manifest(MANIFEST_BYTES)

  builder = DockerSchema2ManifestBuilder()
  builder.set_config_digest(manifest.config.digest, manifest.config.size)

  for layer in manifest.layers:
    builder.add_layer(layer.digest, layer.compressed_size, urls=layer.urls)

  built = builder.build()
  assert built.layers == manifest.layers
  assert built.config == manifest.config


def test_get_manifest_labels():
  labels = dict(foo='bar', baz='meh')

  def _lookup_config(digest):
    config_str = json.dumps({
      "config": {
        "Labels": labels,
      },
      "rootfs": {"type": "layers", "diff_ids": []},
      "history": [],
    })
    return config_str + ' ' * (1885 - len(config_str))

  manifest = DockerSchema2Manifest(MANIFEST_BYTES)
  assert manifest.get_manifest_labels(_lookup_config) == labels


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 schema1.media_type == DOCKER_SCHEMA1_SIGNED_MANIFEST_CONTENT_TYPE
  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

  for index, digest in enumerate(schema1.blob_digests):
    assert digest == str(list(manifest.blob_digests)[index])


def test_generate_legacy_layers():
  builder = DockerSchema2ManifestBuilder()
  builder.add_layer('sha256:abc123', 123)
  builder.add_layer('sha256:def456', 789)
  builder.set_config_digest('sha256:def456', 2000)
  manifest = builder.build()

  def _lookup_config(digest):
    config_str = json.dumps({
      "config": {
      },
      "rootfs": {"type": "layers", "diff_ids": []},
      "history": [
        {
          "created": "2018-04-03T18:37:09.284840891Z",
          "created_by": "foo"
        },
        {
          "created": "2018-04-12T18:37:09.284840891Z",
          "created_by": "bar"
        },
      ],
    })
    return config_str + ' ' * (2000 - len(config_str))

  legacy_layers = list(manifest.generate_legacy_layers({}, _lookup_config))
  assert len(legacy_layers) == 2
  assert legacy_layers[0].content_checksum == 'sha256:abc123'
  assert legacy_layers[1].content_checksum == 'sha256:def456'

  assert legacy_layers[0].created == "2018-04-03T18:37:09.284840891Z"
  assert legacy_layers[1].created == "2018-04-12T18:37:09.284840891Z"

  assert legacy_layers[0].command == '"foo"'
  assert legacy_layers[1].command == '"bar"'

  assert legacy_layers[1].parent_image_id == legacy_layers[0].image_id
  assert legacy_layers[0].parent_image_id is None

  assert legacy_layers[0].image_id != legacy_layers[1]