swh.loader.package.loader module

swh.loader.package.loader.SWH_METADATA_AUTHORITY = MetadataAuthority(type=<MetadataAuthorityType.REGISTRY: 'registry'>, url='https://softwareheritage.org/', metadata=ImmutableDict({}))

Metadata authority for extrinsic metadata generated by Software Heritage. Used for metadata on “original artifacts”, ie. length, filename, and checksums of downloaded archive files.

class swh.loader.package.loader.RawExtrinsicMetadataCore(format: str, metadata: bytes, discovery_date: Optional[datetime.datetime] = None)[source]

Bases: object

Contains the core of the metadata extracted by a loader, that will be used to build a full RawExtrinsicMetadata object by adding object identifier, context, and provenance information.


Defaults to the visit date.

class swh.loader.package.loader.BasePackageInfo(url: str, filename: Optional[str], *, directory_extrinsic_metadata: List[swh.loader.package.loader.RawExtrinsicMetadataCore] = [])[source]

Bases: object

Compute the primary key for a dict using the id_keys as primary key


  • d – A dict entry to compute the primary key on

  • id_keys – Sequence of keys to use as primary key


The identity for that dict entry

property ID_KEYS
class swh.loader.package.loader.PackageLoader(url)[source]

Bases: Generic[swh.loader.package.loader.TPackageInfo]

visit_type = ''
get_versions() → Sequence[str][source]

Return the list of all published package versions.


Sequence of published versions

get_package_info(version: str) → Iterator[Tuple[str, TPackageInfo]][source]
Given a release version of a package, retrieve the associated

package information for such version.


version – Package version


(branch name, package metadata)

build_revision(p_info: TPackageInfo, uncompressed_path: str, directory: bytes) → Optional[swh.model.model.Revision][source]

Build the revision from the archive metadata (extrinsic artifact metadata) and the intrinsic metadata.

  • p_info – Package information

  • uncompressed_path – Artifact uncompressed path on disk


Revision object

get_default_version() → str[source]

Retrieve the latest release version if any.


Latest version

last_snapshot() → Optional[swh.model.model.Snapshot][source]

Retrieve the last snapshot out of the last visit.

known_artifacts(snapshot: Optional[swh.model.model.Snapshot]) → Dict[bytes, Optional[swh.model.collections.ImmutableDict[str, object]]][source]

Retrieve the known releases/artifact for the origin.


snapshot: snapshot for the visit


Dict of keys revision id (bytes), values a metadata Dict.

resolve_revision_from(known_artifacts: Dict, p_info: TPackageInfo) → Optional[bytes][source]

Resolve the revision from a snapshot and an artifact metadata dict.

If the artifact has already been downloaded, this will return the existing revision targeting that uncompressed artifact directory. Otherwise, this returns None.

  • snapshot – Snapshot

  • p_info – Package information


None or revision identifier

download_package(p_info: TPackageInfo, tmpdir: str) → List[Tuple[str, Mapping]][source]

Download artifacts for a specific package. All downloads happen in in the tmpdir folder.

Default implementation expects the artifacts package info to be about one artifact per package.

Note that most implementation have 1 artifact per package. But some implementation have multiple artifacts per package (debian), some have none, the package is the artifact (gnu).

  • artifacts_package_info – Information on the package artifacts to download (url, filename, etc…)

  • tmpdir – Location to retrieve such artifacts


List of (path, computed hashes)

uncompress(dl_artifacts: List[Tuple[str, Mapping[str, Any]]], dest: str) → str[source]

Uncompress the artifact(s) in the destination folder dest.

Optionally, this could need to use the p_info dict for some more information (debian).

extra_branches() → Dict[bytes, Mapping[str, Any]][source]

Return an extra dict of branches that are used to update the set of branches.

load() → Dict[source]

Load for a specific origin the associated contents.

for each package version of the origin

  1. Fetch the files for one package version By default, this can be implemented as a simple HTTP request. Loaders with more specific requirements can override this, e.g.: the PyPI loader checks the integrity of the downloaded files; the Debian loader has to download and check several files for one package version.

  2. Extract the downloaded files By default, this would be a universal archive/tarball extraction.

    Loaders for specific formats can override this method (for instance, the Debian loader uses dpkg-source -x).

  3. Convert the extracted directory to a set of Software Heritage objects Using swh.model.from_disk.

  4. Extract the metadata from the unpacked directories This would only be applicable for “smart” loaders like npm (parsing the package.json), PyPI (parsing the PKG-INFO file) or Debian (parsing debian/changelog and debian/control).

    On “minimal-metadata” sources such as the GNU archive, the lister should provide the minimal set of metadata needed to populate the revision/release objects (authors, dates) as an argument to the task.

  5. Generate the revision/release objects for the given version. From the data generated at steps 3 and 4.

end for each

  1. Generate and load the snapshot for the visit

Using the revisions/releases collected at step 5., and the branch information from step 0., generate a snapshot and load it into the Software Heritage archive

get_loader_name() → str[source]

Returns a fully qualified name of this loader.

get_loader_version() → str[source]

Returns the version of the current loader.


Returns a MetadataFetcher instance representing this package loader; which is used to for adding provenance information to extracted extrinsic metadata, if any.


For package loaders that get extrinsic metadata, returns the authority the metadata are coming from.

get_extrinsic_origin_metadata() → List[swh.loader.package.loader.RawExtrinsicMetadataCore][source]

Returns metadata items, used by build_extrinsic_origin_metadata.

build_extrinsic_origin_metadata() → List[swh.model.model.RawExtrinsicMetadata][source]

Builds a list of full RawExtrinsicMetadata objects, using metadata returned by get_extrinsic_origin_metadata.

get_extrinsic_snapshot_metadata() → List[swh.loader.package.loader.RawExtrinsicMetadataCore][source]

Returns metadata items, used by build_extrinsic_snapshot_metadata.

build_extrinsic_snapshot_metadata(snapshot_id: bytes) → List[swh.model.model.RawExtrinsicMetadata][source]

Builds a list of full RawExtrinsicMetadata objects, using metadata returned by get_extrinsic_snapshot_metadata.

build_extrinsic_directory_metadata(p_info: TPackageInfo, revision_id: bytes, directory_id: bytes) → List[swh.model.model.RawExtrinsicMetadata][source]