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Enhancements for Docker schema implementations in preparing for supporting schema 2 in the OCI model

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This adds additional required properties and methods to the Docker schema interface to allow us to treat both schema1 and schema2 manifests and lists logically equivalent from the OCI mode perspective
This commit is contained in:
Joseph Schorr 2018-11-12 23:27:01 +02:00
parent 6b86b87a16
commit e344d4a5cf
12 changed files with 447 additions and 22 deletions
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22
image/docker/schemas.py Normal file
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from image.docker import ManifestException
from image.docker.schema1 import DockerSchema1Manifest, DOCKER_SCHEMA1_CONTENT_TYPES
from image.docker.schema2 import (DOCKER_SCHEMA2_MANIFEST_CONTENT_TYPE,
DOCKER_SCHEMA2_MANIFESTLIST_CONTENT_TYPE)
from image.docker.schema2.manifest import DockerSchema2Manifest
from image.docker.schema2.list import DockerSchema2ManifestList
def parse_manifest_from_bytes(manifest_bytes, media_type, validate=True):
""" Parses and returns a manifest from the given bytes, for the given media type.
Raises a ManifestException if the parse fails for some reason.
"""
if media_type == DOCKER_SCHEMA2_MANIFEST_CONTENT_TYPE:
return DockerSchema2Manifest(manifest_bytes)
if media_type == DOCKER_SCHEMA2_MANIFESTLIST_CONTENT_TYPE:
return DockerSchema2ManifestList(manifest_bytes)
if media_type in DOCKER_SCHEMA1_CONTENT_TYPES:
return DockerSchema1Manifest(manifest_bytes, validate=validate)
raise ManifestException('Unknown or unsupported manifest media type `%s`' % media_type)