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	diff --git a/swh/provenance/interface.py b/swh/provenance/interface.py
	--- a/swh/provenance/interface.py
	+++ b/swh/provenance/interface.py
	@@ -23,6 +23,11 @@
	ORIGIN = "origin"


	+class UnsupportedEntityError(Exception):
	+ def __init__(self, entity: EntityType) -> None:
	+ super().__init__(f"Unsupported entity: {entity.value}")
	+
	+
	class RelationType(enum.Enum):
	CNT_EARLY_IN_REV = "content_in_revision"
	CNT_IN_DIR = "content_in_directory"
	@@ -107,6 +112,15 @@
	"""
	...

	+ @remote_api_endpoint("entity_get_all")
	+ def entity_add(self, entity: EntityType, ids: Iterable[Sha1Git]) -> bool:
	+ """Add entries to the selected `entity` with `None` values in all optional
	+ fields. `EntityType.ORIGIN` is not supported by this method (it raises a
	+ `UnsupportedEntityError`) since origins have non-optional associated fields
	+ (ie. `url`). See `origin_set_url` for adding origin entries to the storage.
	+ """
	+ ...
	+
	@remote_api_endpoint("entity_get_all")
	def entity_get_all(self, entity: EntityType) -> Set[Sha1Git]:
	"""Retrieve all sha1 ids for entities of type `entity` present in the provenance
	@@ -114,6 +128,11 @@
	"""
	...

	+ @remote_api_endpoint("location_get")
	+ def location_add(self, paths: Iterable[bytes]) -> bool:
	+ """Register the given `paths` in the storage."""
	+ ...
	+
	@remote_api_endpoint("location_get")
	def location_get(self) -> Set[bytes]:
	"""Retrieve all paths present in the provenance model."""
	@@ -144,7 +163,8 @@
	def revision_set_origin(self, origins: Dict[Sha1Git, Sha1Git]) -> bool:
	"""Associate origins to revisions identified by sha1 ids, as paired in
	`origins` (revision ids are keys and origin ids, values). Return a boolean
	- stating whether the information was successfully stored.
	+ stating whether the information was successfully stored. This method assumes
	+ all origins are are already registered in the storage. See `origin_set_url`.
	"""
	...

	@@ -160,7 +180,10 @@
	def relation_add(
	self, relation: RelationType, data: Iterable[RelationData]
	) -> bool:
	- """Add entries in the selected `relation`."""
	+ """Add entries in the selected `relation`. This method assumes all entities
	+ being related are already registered in the storage. See `entity_add` and
	+ `origin_set_url`.
	+ """
	...

	@remote_api_endpoint("relation_get")
	diff --git a/swh/provenance/mongo/backend.py b/swh/provenance/mongo/backend.py
	--- a/swh/provenance/mongo/backend.py
	+++ b/swh/provenance/mongo/backend.py
	@@ -18,6 +18,7 @@
	RelationData,
	RelationType,
	RevisionData,
	+ UnsupportedEntityError,
	)


	@@ -171,6 +172,36 @@
	)
	}

	+ def entity_add(self, entity: EntityType, ids: Iterable[Sha1Git]) -> bool:
	+ if entity == EntityType.ORIGIN:
	+ raise UnsupportedEntityError(entity)
	+
	+ sha1s = list(set(ids))
	+ if ids:
	+ obj: Dict[str, Any] = {"ts": None}
	+ if entity.value == "content":
	+ obj["revision"] = {}
	+ obj["directory"] = {}
	+ if entity.value == "directory":
	+ obj["revision"] = {}
	+ if entity.value == "revision":
	+ obj["preferred"] = None
	+ obj["origin"] = []
	+ obj["revision"] = []
	+
	+ existing = {
	+ x["sha1"]
	+ for x in self.db.get_collection(entity.value).find(
	+ {"sha1": {"$in": sha1s}}, {"_id": 0, "sha1": 1}
	+ )
	+ }
	+ for sha1 in sha1s:
	+ if sha1 not in existing:
	+ self.db.get_collection(entity.value).insert_one(
	+ dict(obj, **{"sha1": sha1})
	+ )
	+ return True
	+
	def entity_get_all(self, entity: EntityType) -> Set[Sha1Git]:
	return {
	x["sha1"]
	@@ -179,6 +210,10 @@
	)
	}

	+ def location_add(self, paths: Iterable[bytes]) -> bool:
	+ # TODO: implement this methods if path are to be stored in a separate collection
	+ return True
	+
	def location_get(self) -> Set[bytes]:
	contents = self.db.content.find({}, {"revision": 1, "_id": 0, "directory": 1})
	paths: List[Iterable[bytes]] = []
	@@ -283,40 +318,10 @@
	src_relation, *_, dst_relation = relation.value.split("_")
	set_data = set(data)

	- dst_sha1s = {x.dst for x in set_data}
	- if dst_relation in ["content", "directory", "revision"]:
	- dst_obj: Dict[str, Any] = {"ts": None}
	- if dst_relation == "content":
	- dst_obj["revision"] = {}
	- dst_obj["directory"] = {}
	- if dst_relation == "directory":
	- dst_obj["revision"] = {}
	- if dst_relation == "revision":
	- dst_obj["preferred"] = None
	- dst_obj["origin"] = []
	- dst_obj["revision"] = []
	-
	- existing = {
	- x["sha1"]
	- for x in self.db.get_collection(dst_relation).find(
	- {"sha1": {"$in": list(dst_sha1s)}}, {"_id": 0, "sha1": 1}
	- )
	- }
	-
	- for sha1 in dst_sha1s:
	- if sha1 not in existing:
	- self.db.get_collection(dst_relation).insert_one(
	- dict(dst_obj, **{"sha1": sha1})
	- )
	- elif dst_relation == "origin":
	- # TODO, check origins are already in the DB
	- # if not, algo has something wrong (algo inserts it initially)
	- pass
	-
	dst_objs = {
	x["sha1"]: x["_id"]
	for x in self.db.get_collection(dst_relation).find(
	- {"sha1": {"$in": list(dst_sha1s)}}, {"_id": 1, "sha1": 1}
	+ {"sha1": {"$in": [x.dst for x in set_data]}}, {"_id": 1, "sha1": 1}
	)
	}

	@@ -337,42 +342,24 @@
	}

	for sha1, dsts in denorm.items():
	- if sha1 in src_objs:
	- # update
	- if src_relation != "revision":
	- k = {
	- obj_id: list(set(paths + dsts.get(obj_id, [])))
	- for obj_id, paths in src_objs[sha1][dst_relation].items()
	- }
	- self.db.get_collection(src_relation).update_one(
	- {"_id": src_objs[sha1]["_id"]},
	- {"$set": {dst_relation: dict(dsts, **k)}},
	- )
	- else:
	- self.db.get_collection(src_relation).update_one(
	- {"_id": src_objs[sha1]["_id"]},
	- {
	- "$set": {
	- dst_relation: list(
	- set(src_objs[sha1][dst_relation] + dsts)
	- )
	- }
	- },
	- )
	+ # update
	+ if src_relation != "revision":
	+ k = {
	+ obj_id: list(set(paths + dsts.get(obj_id, [])))
	+ for obj_id, paths in src_objs[sha1][dst_relation].items()
	+ }
	+ self.db.get_collection(src_relation).update_one(
	+ {"_id": src_objs[sha1]["_id"]},
	+ {"$set": {dst_relation: dict(dsts, **k)}},
	+ )
	else:
	- # add new rev
	- src_obj: Dict[str, Any] = {"ts": None}
	- if src_relation == "content":
	- src_obj["revision"] = {}
	- src_obj["directory"] = {}
	- if src_relation == "directory":
	- src_obj["revision"] = {}
	- if src_relation == "revision":
	- src_obj["preferred"] = None
	- src_obj["origin"] = []
	- src_obj["revision"] = []
	- self.db.get_collection(src_relation).insert_one(
	- dict(src_obj, **{"sha1": sha1, dst_relation: dsts})
	+ self.db.get_collection(src_relation).update_one(
	+ {"_id": src_objs[sha1]["_id"]},
	+ {
	+ "$set": {
	+ dst_relation: list(set(src_objs[sha1][dst_relation] + dsts))
	+ }
	+ },
	)
	return True

	diff --git a/swh/provenance/postgresql/provenance.py b/swh/provenance/postgresql/provenance.py
	--- a/swh/provenance/postgresql/provenance.py
	+++ b/swh/provenance/postgresql/provenance.py
	@@ -22,6 +22,7 @@
	RelationData,
	RelationType,
	RevisionData,
	+ UnsupportedEntityError,
	)

	LOGGER = logging.getLogger(__name__)
	@@ -87,11 +88,52 @@
	def directory_get(self, ids: Iterable[Sha1Git]) -> Dict[Sha1Git, datetime]:
	return self._entity_get_date("directory", ids)

	+ def entity_add(self, entity: EntityType, ids: Iterable[Sha1Git]) -> bool:
	+ if entity == EntityType.ORIGIN:
	+ raise UnsupportedEntityError(entity)
	+
	+ try:
	+ sha1s = [(sha1,) for sha1 in ids]
	+ if sha1s:
	+ sql = f"""
	+ INSERT INTO {entity.value}(sha1) VALUES %s
	+ ON CONFLICT DO NOTHING
	+ """
	+ with self.transaction() as cursor:
	+ psycopg2.extras.execute_values(cursor, sql, argslist=sha1s)
	+ return True
	+ except: # noqa: E722
	+ # Unexpected error occurred, rollback all changes and log message
	+ LOGGER.exception("Unexpected error")
	+ if self.raise_on_commit:
	+ raise
	+ return False
	+
	def entity_get_all(self, entity: EntityType) -> Set[Sha1Git]:
	with self.transaction(readonly=True) as cursor:
	cursor.execute(f"SELECT sha1 FROM {entity.value}")
	return {row["sha1"] for row in cursor}

	+ def location_add(self, paths: Iterable[bytes]) -> bool:
	+ if not self.with_path():
	+ return True
	+ try:
	+ values = [(path,) for path in paths]
	+ if values:
	+ sql = """
	+ INSERT INTO location(path) VALUES %s
	+ ON CONFLICT DO NOTHING
	+ """
	+ with self.transaction() as cursor:
	+ psycopg2.extras.execute_values(cursor, sql, argslist=values)
	+ return True
	+ except: # noqa: E722
	+ # Unexpected error occurred, rollback all changes and log message
	+ LOGGER.exception("Unexpected error")
	+ if self.raise_on_commit:
	+ raise
	+ return False
	+
	def location_get(self) -> Set[bytes]:
	with self.transaction(readonly=True) as cursor:
	cursor.execute("SELECT location.path AS path FROM location")
	@@ -187,32 +229,6 @@
	rel_table = relation.value
	src_table, *_, dst_table = rel_table.split("_")

	- if src_table != "origin":
	- # Origin entries should be inserted previously as they require extra
	- # non-null information
	- srcs = tuple(set((sha1,) for (sha1, _, _) in rows))
	- sql = f"""
	- INSERT INTO {src_table}(sha1) VALUES %s
	- ON CONFLICT DO NOTHING
	- """
	- with self.transaction() as cursor:
	- psycopg2.extras.execute_values(
	- cur=cursor, sql=sql, argslist=srcs
	- )
	-
	- if dst_table != "origin":
	- # Origin entries should be inserted previously as they require extra
	- # non-null information
	- dsts = tuple(set((sha1,) for (_, sha1, _) in rows))
	- sql = f"""
	- INSERT INTO {dst_table}(sha1) VALUES %s
	- ON CONFLICT DO NOTHING
	- """
	- with self.transaction() as cursor:
	- psycopg2.extras.execute_values(
	- cur=cursor, sql=sql, argslist=dsts
	- )
	-
	# Put the next three queries in a manual single transaction:
	# they use the same temp table
	with self.transaction() as cursor:
	diff --git a/swh/provenance/provenance.py b/swh/provenance/provenance.py
	--- a/swh/provenance/provenance.py
	+++ b/swh/provenance/provenance.py
	@@ -13,6 +13,7 @@
	from swh.model.model import Sha1Git

	from .interface import (
	+ EntityType,
	ProvenanceResult,
	ProvenanceStorageInterface,
	RelationData,
	@@ -79,6 +80,49 @@
	def flush(self) -> None:
	# Revision-content layer insertions ############################################

	+ # After relations, dates for the entities can be safely set, acknowledging that
	+ # these entities won't need to be reprocessed in case of failure.
	+ sha1s = {
	+ src
	+ for src, _, _ in self.cache["content_in_revision"]
	+ \| self.cache["content_in_directory"]
	+ }
	+ if sha1s:
	+ while not self.storage.entity_add(EntityType.CONTENT, sha1s):
	+ LOGGER.warning(
	+ "Unable to write content entities to the storage. Retrying..."
	+ )
	+
	+ sha1s = {dst for _, dst, _ in self.cache["content_in_directory"]}
	+ if sha1s:
	+ while not self.storage.entity_add(EntityType.DIRECTORY, sha1s):
	+ LOGGER.warning(
	+ "Unable to write directory entities to the storage. Retrying..."
	+ )
	+
	+ sha1s = {
	+ dst
	+ for _, dst, _ in self.cache["content_in_revision"]
	+ \| self.cache["directory_in_revision"]
	+ }
	+ if sha1s:
	+ while not self.storage.entity_add(EntityType.REVISION, sha1s):
	+ LOGGER.warning(
	+ "Unable to write revision entities to the storage. Retrying..."
	+ )
	+
	+ paths = {
	+ path
	+ for _, _, path in self.cache["content_in_revision"]
	+ \| self.cache["content_in_directory"]
	+ \| self.cache["directory_in_revision"]
	+ }
	+ if paths:
	+ while not self.storage.location_add(paths):
	+ LOGGER.warning(
	+ "Unable to write locations entities to the storage. Retrying..."
	+ )
	+
	# For this layer, relations need to be inserted first so that, in case of
	# failure, reprocessing the input does not generated an inconsistent database.
	if self.cache["content_in_revision"]:
	@@ -170,6 +214,17 @@
	"Unable to write origins urls to the storage. Retrying..."
	)

	+ sha1s = (
	+ {src for src in self.cache["revision_origin"]["added"]}
	+ # Destinations in this relation should match origins in the previous one
	+ \| {src for src in self.cache["revision_before_revision"]}
	+ )
	+ if sha1s:
	+ while not self.storage.entity_add(EntityType.REVISION, sha1s):
	+ LOGGER.warning(
	+ "Unable to write revision entities to the storage. Retrying..."
	+ )
	+
	# Second, flat models for revisions' histories (ie. revision-before-revision).
	data: Iterable[RelationData] = sum(
	[
	diff --git a/swh/provenance/sql/40-funcs.sql b/swh/provenance/sql/40-funcs.sql
	--- a/swh/provenance/sql/40-funcs.sql
	+++ b/swh/provenance/sql/40-funcs.sql
	@@ -99,11 +99,6 @@
	join_location text;
	begin
	if src_table in ('content'::regclass, 'directory'::regclass) then
	- insert into location(path)
	- select V.path
	- from tmp_relation_add as V
	- on conflict (path) do nothing;
	-
	select_fields := 'D.id, L.id';
	join_location := 'inner join location as L on (L.path = V.path)';
	else
	@@ -419,11 +414,6 @@
	on_conflict text;
	begin
	if src_table in ('content'::regclass, 'directory'::regclass) then
	- insert into location(path)
	- select V.path
	- from tmp_relation_add as V
	- on conflict (path) do nothing;
	-
	select_fields := 'array_agg((D.id, L.id)::rel_dst)';
	join_location := 'inner join location as L on (L.path = V.path)';
	group_entries := 'group by S.id';
	diff --git a/swh/provenance/tests/test_provenance_storage.py b/swh/provenance/tests/test_provenance_storage.py
	--- a/swh/provenance/tests/test_provenance_storage.py
	+++ b/swh/provenance/tests/test_provenance_storage.py
	@@ -3,7 +3,7 @@
	# License: GNU General Public License version 3, or any later version
	# See top-level LICENSE file for more information

	-from datetime import datetime
	+from datetime import datetime, timezone
	import inspect
	import os
	from typing import Any, Dict, Iterable, Optional, Set
	@@ -13,6 +13,7 @@
	from swh.model.hashutil import hash_to_bytes
	from swh.model.identifiers import origin_identifier
	from swh.model.model import Sha1Git
	+from swh.provenance.archive import ArchiveInterface
	from swh.provenance.interface import (
	EntityType,
	ProvenanceInterface,
	@@ -20,54 +21,210 @@
	ProvenanceStorageInterface,
	RelationData,
	RelationType,
	+ RevisionData,
	+ UnsupportedEntityError,
	)
	-from swh.provenance.tests.conftest import load_repo_data, ts2dt
	+from swh.provenance.model import OriginEntry, RevisionEntry
	+from swh.provenance.mongo.backend import ProvenanceStorageMongoDb
	+from swh.provenance.origin import origin_add
	+from swh.provenance.provenance import Provenance
	+from swh.provenance.revision import revision_add
	+from swh.provenance.tests.conftest import fill_storage, load_repo_data, ts2dt


	-def relation_add_and_compare_result(
	- relation: RelationType,
	- data: Set[RelationData],
	- refstorage: ProvenanceStorageInterface,
	- storage: ProvenanceStorageInterface,
	- with_path: bool = True,
	+@pytest.mark.parametrize(
	+ "repo",
	+ ("cmdbts2",),
	+)
	+def test_provenance_storage_content(
	+ provenance_storage: ProvenanceStorageInterface,
	+ repo: str,
	) -> None:
	- assert data
	- assert refstorage.relation_add(relation, data) == storage.relation_add(
	- relation, data
	- )
	+ """Tests content methods for every `ProvenanceStorageInterface` implementation."""

	- assert relation_compare_result(
	- refstorage.relation_get(relation, (reldata.src for reldata in data)),
	- storage.relation_get(relation, (reldata.src for reldata in data)),
	- with_path,
	- )
	- assert relation_compare_result(
	- refstorage.relation_get(
	- relation,
	- (reldata.dst for reldata in data),
	- reverse=True,
	- ),
	- storage.relation_get(
	- relation,
	- (reldata.dst for reldata in data),
	- reverse=True,
	- ),
	- with_path,
	- )
	- assert relation_compare_result(
	- refstorage.relation_get_all(relation),
	- storage.relation_get_all(relation),
	- with_path,
	- )
	+ # Read data/README.md for more details on how these datasets are generated.
	+ data = load_repo_data(repo)

	+ # Add all content present in the current repo to the storage, just assigning their
	+ # creation dates. Then check that the returned results when querying are the same.
	+ dates = {cnt["sha1_git"]: cnt["ctime"] for cnt in data["content"]}
	+ assert dates
	+ assert provenance_storage.content_set_date(dates)
	+ assert provenance_storage.content_get(set(dates.keys())) == dates
	+ assert provenance_storage.entity_get_all(EntityType.CONTENT) == set(dates.keys())

	-def relation_compare_result(
	- expected: Set[RelationData], computed: Set[RelationData], with_path: bool
	-) -> bool:
	- return {
	- RelationData(reldata.src, reldata.dst, reldata.path if with_path else None)
	- for reldata in expected
	- } == computed
	+
	+@pytest.mark.parametrize(
	+ "repo",
	+ ("cmdbts2",),
	+)
	+def test_provenance_storage_directory(
	+ provenance_storage: ProvenanceStorageInterface,
	+ repo: str,
	+) -> None:
	+ """Tests directory methods for every `ProvenanceStorageInterface` implementation."""
	+
	+ # Read data/README.md for more details on how these datasets are generated.
	+ data = load_repo_data(repo)
	+
	+ # Of all directories present in the current repo, only assign a date to those
	+ # containing blobs (picking the max date among the available ones). Then check that
	+ # the returned results when querying are the same.
	+ def getmaxdate(
	+ directory: Dict[str, Any], contents: Iterable[Dict[str, Any]]
	+ ) -> datetime:
	+ dates = [
	+ content["ctime"]
	+ for entry in directory["entries"]
	+ for content in contents
	+ if entry["type"] == "file" and entry["target"] == content["sha1_git"]
	+ ]
	+ return max(dates) if dates else datetime.now(tz=timezone.utc)
	+
	+ dates = {dir["id"]: getmaxdate(dir, data["content"]) for dir in data["directory"]}
	+ assert dates
	+ assert provenance_storage.directory_set_date(dates)
	+ assert provenance_storage.directory_get(set(dates.keys())) == dates
	+ assert provenance_storage.entity_get_all(EntityType.DIRECTORY) == set(dates.keys())
	+
	+
	+@pytest.mark.parametrize(
	+ "repo",
	+ ("cmdbts2",),
	+)
	+def test_provenance_storage_entity(
	+ provenance_storage: ProvenanceStorageInterface,
	+ repo: str,
	+) -> None:
	+ """Tests entity methods for every `ProvenanceStorageInterface` implementation."""
	+
	+ # Read data/README.md for more details on how these datasets are generated.
	+ data = load_repo_data(repo)
	+
	+ # Test EntityType.CONTENT
	+ # Add all contents present in the current repo to the storage. Then check that the
	+ # returned results when querying are the same.
	+ sha1s = {cnt["sha1_git"] for cnt in data["content"]}
	+ assert sha1s
	+ assert provenance_storage.entity_add(EntityType.CONTENT, sha1s)
	+ assert provenance_storage.entity_get_all(EntityType.CONTENT) == sha1s
	+
	+ # Test EntityType.DIRECTORY
	+ # Add all directories present in the current repo to the storage. Then check that
	+ # the returned directories when querying are the same.
	+ sha1s = {dir["id"] for dir in data["directory"]}
	+ assert sha1s
	+ assert provenance_storage.entity_add(EntityType.DIRECTORY, sha1s)
	+ assert provenance_storage.entity_get_all(EntityType.DIRECTORY) == sha1s
	+
	+ # Test EntityType.REVISION
	+ # Add all revisions present in the current repo to the storage. Then check that the
	+ # returned revisions when querying are the same.
	+ sha1s = {rev["id"] for rev in data["revision"]}
	+ assert sha1s
	+ assert provenance_storage.entity_add(EntityType.REVISION, sha1s)
	+ assert provenance_storage.entity_get_all(EntityType.REVISION) == sha1s
	+
	+ # Test EntityType.ORIGIN
	+ # Add all origins present in the current repo. It should fail with a
	+ # `UnsupportedEntityError`. Then check that indeed nothing was inserted.
	+ sha1s = {hash_to_bytes(origin_identifier(org)) for org in data["origin"]}
	+ assert sha1s
	+ with pytest.raises(UnsupportedEntityError) as error:
	+ provenance_storage.entity_add(EntityType.ORIGIN, sha1s)
	+ assert "Unsupported entity: origin" in str(error.value)
	+ assert provenance_storage.entity_get_all(EntityType.ORIGIN) == set()
	+
	+
	+@pytest.mark.parametrize(
	+ "repo",
	+ ("cmdbts2",),
	+)
	+def test_provenance_storage_location(
	+ provenance_storage: ProvenanceStorageInterface,
	+ repo: str,
	+) -> None:
	+ """Tests location methods for every `ProvenanceStorageInterface` implementation."""
	+
	+ # Read data/README.md for more details on how these datasets are generated.
	+ data = load_repo_data(repo)
	+
	+ # Add all names of entries present in the directories of the current repo as paths
	+ # to the storage. Then check that the returned results when querying are the same.
	+ paths = {entry["name"] for dir in data["directory"] for entry in dir["entries"]}
	+ assert provenance_storage.location_add(paths)
	+
	+ if isinstance(provenance_storage, ProvenanceStorageMongoDb):
	+ # TODO: remove this when `location_add` is properly implemented for MongoDb.
	+ return
	+
	+ if provenance_storage.with_path():
	+ assert provenance_storage.location_get() == paths
	+ else:
	+ assert provenance_storage.location_get() == set()
	+
	+
	+@pytest.mark.parametrize(
	+ "repo",
	+ ("cmdbts2",),
	+)
	+def test_provenance_storage_origin(
	+ provenance_storage: ProvenanceStorageInterface,
	+ repo: str,
	+) -> None:
	+ """Tests origin methods for every `ProvenanceStorageInterface` implementation."""
	+
	+ # Read data/README.md for more details on how these datasets are generated.
	+ data = load_repo_data(repo)
	+
	+ # Test origin methods.
	+ # Add all origins present in the current repo to the storage. Then check that the
	+ # returned results when querying are the same.
	+ urls = {hash_to_bytes(origin_identifier(org)): org["url"] for org in data["origin"]}
	+ assert urls
	+ assert provenance_storage.origin_set_url(urls)
	+ assert provenance_storage.origin_get(set(urls.keys())) == urls
	+ assert provenance_storage.entity_get_all(EntityType.ORIGIN) == set(urls.keys())
	+
	+
	+@pytest.mark.parametrize(
	+ "repo",
	+ ("cmdbts2",),
	+)
	+def test_provenance_storage_revision(
	+ provenance_storage: ProvenanceStorageInterface,
	+ repo: str,
	+) -> None:
	+ """Tests revision methods for every `ProvenanceStorageInterface` implementation."""
	+
	+ # Read data/README.md for more details on how these datasets are generated.
	+ data = load_repo_data(repo)
	+
	+ # Test revision methods.
	+ # Add all revisions present in the current repo to the storage, assigning their
	+ # dates and an arbitrary origin to each one. Then check that the returned results
	+ # when querying are the same.
	+ origin = next(iter(data["origin"]))
	+ org_sha1 = hash_to_bytes(origin_identifier(origin))
	+ # Origin must be inserted in advance.
	+ assert provenance_storage.origin_set_url({org_sha1: origin["url"]})
	+
	+ dates = {rev["id"]: ts2dt(rev["date"]) for rev in data["revision"]}
	+ orgs = {rev["id"]: org_sha1 for rev in data["revision"]}
	+ assert set(dates.keys()) == set(orgs.keys())
	+ revs = {
	+ rev: RevisionData(date, org)
	+ for sha1, date in dates.items()
	+ for rev, org in orgs.items()
	+ if rev == sha1
	+ }
	+
	+ assert dates
	+ assert orgs
	+ assert provenance_storage.revision_set_date(dates)
	+ assert provenance_storage.revision_set_origin(orgs)
	+ assert provenance_storage.revision_get(set(revs.keys())) == revs
	+ assert provenance_storage.entity_get_all(EntityType.REVISION) == set(revs.keys())


	def dircontent(
	@@ -94,41 +251,66 @@
	return content


	+def relation_add_and_compare_result(
	+ relation: RelationType, data: Set[RelationData], storage: ProvenanceStorageInterface
	+) -> None:
	+ # Source, destinations and locations must be added in advance.
	+ src, *_, dst = relation.value.split("_")
	+ if src != "origin":
	+ assert storage.entity_add(EntityType(src), {entry.src for entry in data})
	+ if dst != "origin":
	+ assert storage.entity_add(EntityType(dst), {entry.dst for entry in data})
	+ if storage.with_path():
	+ assert storage.location_add(
	+ {entry.path for entry in data if entry.path is not None}
	+ )
	+
	+ assert data
	+ assert storage.relation_add(relation, data)
	+
	+ for row in data:
	+ assert relation_compare_result(
	+ storage.relation_get(relation, [row.src]),
	+ {entry for entry in data if entry.src == row.src},
	+ storage.with_path(),
	+ )
	+ assert relation_compare_result(
	+ storage.relation_get(
	+ relation,
	+ [row.dst],
	+ reverse=True,
	+ ),
	+ {entry for entry in data if entry.dst == row.dst},
	+ storage.with_path(),
	+ )
	+
	+ assert relation_compare_result(
	+ storage.relation_get_all(relation), data, storage.with_path()
	+ )
	+
	+
	+def relation_compare_result(
	+ computed: Set[RelationData], expected: Set[RelationData], with_path: bool
	+) -> bool:
	+ return {
	+ RelationData(row.src, row.dst, row.path if with_path else None)
	+ for row in expected
	+ } == computed
	+
	+
	@pytest.mark.parametrize(
	"repo",
	- ("cmdbts2", "out-of-order", "with-merges"),
	+ ("cmdbts2",),
	)
	-def test_provenance_storage(
	- provenance: ProvenanceInterface,
	+def test_provenance_storage_relation(
	provenance_storage: ProvenanceStorageInterface,
	repo: str,
	) -> None:
	- """Tests every ProvenanceStorageInterface implementation against the one provided
	- for provenance.storage."""
	+ """Tests relation methods for every `ProvenanceStorageInterface` implementation."""
	+
	# Read data/README.md for more details on how these datasets are generated.
	data = load_repo_data(repo)

	- # Assuming provenance.storage has the 'with-path' flavor.
	- assert provenance.storage.with_path()
	-
	- # Test origin methods.
	- # Add all origins present in the current repo to both storages. Then check that the
	- # inserted data is the same in both cases.
	- org_urls = {
	- hash_to_bytes(origin_identifier(org)): org["url"] for org in data["origin"]
	- }
	- assert org_urls
	- assert provenance.storage.origin_set_url(
	- org_urls
	- ) == provenance_storage.origin_set_url(org_urls)
	-
	- assert provenance.storage.origin_get(org_urls) == provenance_storage.origin_get(
	- org_urls
	- )
	- assert provenance.storage.entity_get_all(
	- EntityType.ORIGIN
	- ) == provenance_storage.entity_get_all(EntityType.ORIGIN)
	-
	# Test content-in-revision relation.
	# Create flat models of every root directory for the revisions in the dataset.
	cnt_in_rev: Set[RelationData] = set()
	@@ -137,13 +319,8 @@
	subdir for subdir in data["directory"] if subdir["id"] == rev["directory"]
	)
	cnt_in_rev.update(dircontent(data, rev["id"], root))
	-
	relation_add_and_compare_result(
	- RelationType.CNT_EARLY_IN_REV,
	- cnt_in_rev,
	- provenance.storage,
	- provenance_storage,
	- provenance_storage.with_path(),
	+ RelationType.CNT_EARLY_IN_REV, cnt_in_rev, provenance_storage
	)

	# Test content-in-directory relation.
	@@ -151,13 +328,8 @@
	cnt_in_dir: Set[RelationData] = set()
	for dir in data["directory"]:
	cnt_in_dir.update(dircontent(data, dir["id"], dir))
	-
	relation_add_and_compare_result(
	- RelationType.CNT_IN_DIR,
	- cnt_in_dir,
	- provenance.storage,
	- provenance_storage,
	- provenance_storage.with_path(),
	+ RelationType.CNT_IN_DIR, cnt_in_dir, provenance_storage
	)

	# Test content-in-directory relation.
	@@ -165,13 +337,8 @@
	dir_in_rev = {
	RelationData(rev["directory"], rev["id"], b".") for rev in data["revision"]
	}
	-
	relation_add_and_compare_result(
	- RelationType.DIR_IN_REV,
	- dir_in_rev,
	- provenance.storage,
	- provenance_storage,
	- provenance_storage.with_path(),
	+ RelationType.DIR_IN_REV, dir_in_rev, provenance_storage
	)

	# Test revision-in-origin relation.
	@@ -190,12 +357,16 @@
	for _, branch in snapshot["branches"].items()
	if branch["target_type"] == "revision"
	}
	+ # Origins must be inserted in advance (cannot be done by `entity_add` inside
	+ # `relation_add_and_compare_result`).
	+ urls = {
	+ hash_to_bytes(origin_identifier(origin)): origin["url"]
	+ for origin in data["origin"]
	+ }
	+ assert provenance_storage.origin_set_url(urls)

	relation_add_and_compare_result(
	- RelationType.REV_IN_ORG,
	- rev_in_org,
	- provenance.storage,
	- provenance_storage,
	+ RelationType.REV_IN_ORG, rev_in_org, provenance_storage
	)

	# Test revision-before-revision relation.
	@@ -205,87 +376,45 @@
	for rev in data["revision"]
	for parent in rev["parents"]
	}
	-
	relation_add_and_compare_result(
	- RelationType.REV_BEFORE_REV,
	- rev_before_rev,
	- provenance.storage,
	- provenance_storage,
	+ RelationType.REV_BEFORE_REV, rev_before_rev, provenance_storage
	)

	- # Test content methods.
	- # Add all content present in the current repo to both storages, just assigning their
	- # creation dates. Then check that the inserted content is the same in both cases.
	- cnt_dates = {cnt["sha1_git"]: cnt["ctime"] for cnt in data["content"]}
	- assert cnt_dates
	- assert provenance.storage.content_set_date(
	- cnt_dates
	- ) == provenance_storage.content_set_date(cnt_dates)
	-
	- assert provenance.storage.content_get(cnt_dates) == provenance_storage.content_get(
	- cnt_dates
	- )
	- assert provenance.storage.entity_get_all(
	- EntityType.CONTENT
	- ) == provenance_storage.entity_get_all(EntityType.CONTENT)

	- # Test directory methods.
	- # Of all directories present in the current repo, only assign a date to those
	- # containing blobs (picking the max date among the available ones). Then check that
	- # the inserted data is the same in both storages.
	- def getmaxdate(
	- dir: Dict[str, Any], cnt_dates: Dict[Sha1Git, datetime]
	- ) -> Optional[datetime]:
	- dates = [
	- cnt_dates[entry["target"]]
	- for entry in dir["entries"]
	- if entry["type"] == "file"
	- ]
	- return max(dates) if dates else None
	-
	- dir_dates = {dir["id"]: getmaxdate(dir, cnt_dates) for dir in data["directory"]}
	- assert dir_dates
	- assert provenance.storage.directory_set_date(
	- {sha1: date for sha1, date in dir_dates.items() if date is not None}
	- ) == provenance_storage.directory_set_date(
	- {sha1: date for sha1, date in dir_dates.items() if date is not None}
	- )
	- assert provenance.storage.directory_get(
	- dir_dates
	- ) == provenance_storage.directory_get(dir_dates)
	- assert provenance.storage.entity_get_all(
	- EntityType.DIRECTORY
	- ) == provenance_storage.entity_get_all(EntityType.DIRECTORY)
	+@pytest.mark.parametrize(
	+ "repo",
	+ ("cmdbts2",),
	+)
	+def test_provenance_storage_find(
	+ archive: ArchiveInterface,
	+ provenance: ProvenanceInterface,
	+ provenance_storage: ProvenanceStorageInterface,
	+ repo: str,
	+) -> None:
	+ """Tests `content_find_first` and `content_find_all` methods for every
	+ `ProvenanceStorageInterface` implementation.
	+ """

	- # Test revision methods.
	- # Add all revisions present in the current repo to both storages, assigning their
	- # dataes and an arbitrary origin to each one. Then check that the inserted data is
	- # the same in both cases.
	- rev_dates = {rev["id"]: ts2dt(rev["date"]) for rev in data["revision"]}
	- assert rev_dates
	- assert provenance.storage.revision_set_date(
	- rev_dates
	- ) == provenance_storage.revision_set_date(rev_dates)
	-
	- rev_origins = {
	- rev["id"]: next(iter(org_urls)) # any arbitrary origin will do
	+ # Read data/README.md for more details on how these datasets are generated.
	+ data = load_repo_data(repo)
	+ fill_storage(archive.storage, data)
	+
	+ # Execute the origin-revision algorithm on both storages.
	+ origins = [
	+ OriginEntry(url=sta["origin"], snapshot=sta["snapshot"])
	+ for sta in data["origin_visit_status"]
	+ if sta["snapshot"] is not None
	+ ]
	+ origin_add(provenance, archive, origins)
	+ origin_add(Provenance(provenance_storage), archive, origins)
	+
	+ # Execute the revision-content algorithm on both storages.
	+ revisions = [
	+ RevisionEntry(id=rev["id"], date=ts2dt(rev["date"]), root=rev["directory"])
	for rev in data["revision"]
	- }
	- assert rev_origins
	- assert provenance.storage.revision_set_origin(
	- rev_origins
	- ) == provenance_storage.revision_set_origin(rev_origins)
	-
	- assert provenance.storage.revision_get(
	- rev_dates
	- ) == provenance_storage.revision_get(rev_dates)
	- assert provenance.storage.entity_get_all(
	- EntityType.REVISION
	- ) == provenance_storage.entity_get_all(EntityType.REVISION)
	-
	- # Test location_get.
	- if provenance_storage.with_path():
	- assert provenance.storage.location_get() == provenance_storage.location_get()
	+ ]
	+ revision_add(provenance, archive, revisions)
	+ revision_add(Provenance(provenance_storage), archive, revisions)

	# Test content_find_first and content_find_all.
	def adapt_result(
	@@ -301,7 +430,7 @@
	)
	return result

	- for cnt in cnt_dates:
	+ for cnt in {cnt["sha1_git"] for cnt in data["content"]}:
	assert adapt_result(
	provenance.storage.content_find_first(cnt), provenance_storage.with_path()
	) == provenance_storage.content_find_first(cnt)
	@@ -312,7 +441,7 @@
	} == set(provenance_storage.content_find_all(cnt))


	-def test_types(provenance: ProvenanceInterface) -> None:
	+def test_types(provenance_storage: ProvenanceInterface) -> None:
	"""Checks all methods of ProvenanceStorageInterface are implemented by this
	backend, and that they have the same signature."""
	# Create an instance of the protocol (which cannot be instantiated
	@@ -328,7 +457,7 @@
	continue
	interface_meth = getattr(interface, meth_name)
	try:
	- concrete_meth = getattr(provenance.storage, meth_name)
	+ concrete_meth = getattr(provenance_storage, meth_name)
	except AttributeError:
	if not getattr(interface_meth, "deprecated_endpoint", False):
	# The backend is missing a (non-deprecated) endpoint
	@@ -346,4 +475,4 @@
	# But there's no harm in double-checking.
	# And we could replace the assertions above by this one, but unlike
	# the assertions above, it doesn't explain what is missing.
	- assert isinstance(provenance.storage, ProvenanceStorageInterface)
	+ assert isinstance(provenance_storage, ProvenanceStorageInterface)

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