135 lines
6.2 KiB
Python
135 lines
6.2 KiB
Python
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import hashlib
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from contextlib import contextmanager
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from app import storage, docker_v2_signing_key
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from data import model, database
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from endpoints.v2.manifest import _write_manifest
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from image.docker.schema1 import DockerSchema1ManifestBuilder
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from test.fixtures import *
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ADMIN_ACCESS_USER = 'devtable'
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REPO = 'simple'
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FIRST_TAG = 'first'
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SECOND_TAG = 'second'
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THIRD_TAG = 'third'
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@contextmanager
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def set_tag_expiration_policy(namespace, expiration_s=0):
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namespace_user = model.user.get_user(namespace)
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model.user.change_user_tag_expiration(namespace_user, expiration_s)
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yield
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def _perform_cleanup():
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database.RepositoryTag.delete().where(database.RepositoryTag.hidden == True).execute()
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repo_object = model.repository.get_repository(ADMIN_ACCESS_USER, REPO)
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model.repository.garbage_collect_repo(repo_object)
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def test_missing_link(initialized_db):
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""" Tests for a corner case that could result in missing a link to a blob referenced by a
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manifest. The test exercises the case as follows:
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1) Push a manifest of a single layer with a Docker ID `FIRST_ID`, pointing
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to blob `FIRST_BLOB`. The database should contain the tag referencing the layer, with
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no changed ID and the blob not being GCed.
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2) Push a manifest of two layers:
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Layer 1: `FIRST_ID` with blob `SECOND_BLOB`: Will result in a new synthesized ID
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Layer 2: `SECOND_ID` with blob `THIRD_BLOB`: Will result in `SECOND_ID` pointing to the
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`THIRD_BLOB`, with a parent pointing to the new synthesized ID's layer.
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3) Push a manifest of two layers:
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Layer 1: `THIRD_ID` with blob `FOURTH_BLOB`: Will result in a new `THIRD_ID` layer
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Layer 2: `FIRST_ID` with blob `THIRD_BLOB`: Since `FIRST_ID` already points to `SECOND_BLOB`,
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this will synthesize a new ID. With the current bug, the synthesized ID will match
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that of `SECOND_ID`, leaving `THIRD_ID` unlinked and therefore, after a GC, missing
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`FOURTH_BLOB`.
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"""
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with set_tag_expiration_policy('devtable', 0):
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location_name = storage.preferred_locations[0]
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location = database.ImageStorageLocation.get(name=location_name)
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# Create first blob.
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first_blob_sha = 'sha256:' + hashlib.sha256("FIRST").hexdigest()
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model.blob.store_blob_record_and_temp_link(ADMIN_ACCESS_USER, REPO, first_blob_sha, location, 0, 0, 0)
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# Push the first manifest.
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first_manifest = (DockerSchema1ManifestBuilder(ADMIN_ACCESS_USER, REPO, FIRST_TAG)
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.add_layer(first_blob_sha, '{"id": "first"}')
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.build(docker_v2_signing_key))
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_write_manifest(ADMIN_ACCESS_USER, REPO, first_manifest)
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# Delete all temp tags and perform GC.
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_perform_cleanup()
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# Ensure that the first blob still exists, along with the first tag.
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assert model.blob.get_repo_blob_by_digest(ADMIN_ACCESS_USER, REPO, first_blob_sha) is not None
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assert model.tag.load_tag_manifest(ADMIN_ACCESS_USER, REPO, FIRST_TAG) is not None
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assert model.tag.get_tag_image(ADMIN_ACCESS_USER, REPO, FIRST_TAG).docker_image_id == 'first'
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# Create the second and third blobs.
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second_blob_sha = 'sha256:' + hashlib.sha256("SECOND").hexdigest()
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third_blob_sha = 'sha256:' + hashlib.sha256("THIRD").hexdigest()
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model.blob.store_blob_record_and_temp_link(ADMIN_ACCESS_USER, REPO, second_blob_sha, location, 0, 0, 0)
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model.blob.store_blob_record_and_temp_link(ADMIN_ACCESS_USER, REPO, third_blob_sha, location, 0, 0, 0)
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# Push the second manifest.
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second_manifest = (DockerSchema1ManifestBuilder(ADMIN_ACCESS_USER, REPO, SECOND_TAG)
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.add_layer(third_blob_sha, '{"id": "second", "parent": "first"}')
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.add_layer(second_blob_sha, '{"id": "first"}')
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.build(docker_v2_signing_key))
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_write_manifest(ADMIN_ACCESS_USER, REPO, second_manifest)
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# Delete all temp tags and perform GC.
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_perform_cleanup()
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# Ensure that the first and second blobs still exists, along with the second tag.
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assert model.blob.get_repo_blob_by_digest(ADMIN_ACCESS_USER, REPO, first_blob_sha) is not None
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assert model.blob.get_repo_blob_by_digest(ADMIN_ACCESS_USER, REPO, second_blob_sha) is not None
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assert model.blob.get_repo_blob_by_digest(ADMIN_ACCESS_USER, REPO, third_blob_sha) is not None
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assert model.tag.load_tag_manifest(ADMIN_ACCESS_USER, REPO, FIRST_TAG) is not None
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assert model.tag.load_tag_manifest(ADMIN_ACCESS_USER, REPO, SECOND_TAG) is not None
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assert model.tag.get_tag_image(ADMIN_ACCESS_USER, REPO, FIRST_TAG).docker_image_id == 'first'
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# Ensure the IDs have changed.
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assert model.tag.get_tag_image(ADMIN_ACCESS_USER, REPO, SECOND_TAG).parent.docker_image_id != 'first'
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assert model.tag.get_tag_image(ADMIN_ACCESS_USER, REPO, SECOND_TAG).docker_image_id != 'second'
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# Create the fourth blob.
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fourth_blob_sha = 'sha256:' + hashlib.sha256("FOURTH").hexdigest()
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model.blob.store_blob_record_and_temp_link(ADMIN_ACCESS_USER, REPO, fourth_blob_sha, location, 0, 0, 0)
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# Push the third manifest.
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third_manifest = (DockerSchema1ManifestBuilder(ADMIN_ACCESS_USER, REPO, THIRD_TAG)
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.add_layer(third_blob_sha, '{"id": "second", "parent": "first"}')
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.add_layer(fourth_blob_sha, '{"id": "first"}') # Note the change in BLOB from the second manifest.
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.build(docker_v2_signing_key))
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_write_manifest(ADMIN_ACCESS_USER, REPO, third_manifest)
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# Delete all temp tags and perform GC.
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_perform_cleanup()
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# Ensure all blobs are present.
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assert model.blob.get_repo_blob_by_digest(ADMIN_ACCESS_USER, REPO, first_blob_sha) is not None
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assert model.blob.get_repo_blob_by_digest(ADMIN_ACCESS_USER, REPO, second_blob_sha) is not None
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assert model.blob.get_repo_blob_by_digest(ADMIN_ACCESS_USER, REPO, third_blob_sha) is not None
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assert model.blob.get_repo_blob_by_digest(ADMIN_ACCESS_USER, REPO, fourth_blob_sha) is not None
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# Ensure new synthesized IDs were created.
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second_tag_id = model.tag.get_tag_image(ADMIN_ACCESS_USER, REPO, SECOND_TAG).docker_image_id
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third_tag_id = model.tag.get_tag_image(ADMIN_ACCESS_USER, REPO, THIRD_TAG).docker_image_id
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assert second_tag_id != third_tag_id
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