Software Heritage - Development Documentation

Getting started

Architecture

Components

Here is brief overview of the most relevant software components in the Software Heritage stack. Each component name is linked to the development documentation of the corresponding Python module.

swh.core

low-level utilities and helpers used by almost all other modules in the stack

swh.dataset

public datasets and periodic data dumps of the archive released by Software Heritage

swh.deposit

push-based deposit of software artifacts to the archive

swh.docs

developer documentation (used to generate this doc you are reading)

swh.graph

Fast, compressed, in-memory representation of the archive, with tooling to generate and query it.

swh.indexer

tools and workers used to crawl the content of the archive and extract derived information from any artifact stored in it

swh.journal

persistent logger of changes to the archive, with publish-subscribe support

swh.lister

collection of listers for all sorts of source code hosting and distribution places (forges, distributions, package managers, etc.)

swh.loader-core

low-level loading utilities and helpers used by all other loaders

swh.loader-git

loader for Git repositories

swh.loader-mercurial

loader for Mercurial repositories

swh.loader-svn

loader for Subversion repositories

swh.model

implementation of the Data model to archive source code artifacts

swh.objstorage

content-addressable object storage

swh.objstorage.replayer

Object storage replication tool

swh.scheduler

task manager for asynchronous/delayed tasks, used for recurrent (e.g., listing a forge, loading new stuff from a Git repository) and one-off activities (e.g., loading a specific version of a source package)

swh.storage

abstraction layer over the archive, allowing to access all stored source code artifacts as well as their metadata

swh.vault

implementation of the vault service, allowing to retrieve parts of the archive as self-contained bundles (e.g., individual releases, entire repository snapshots, etc.)

swh.web

Web application(s) to browse the archive, for both interactive (HTML UI) and mechanized (REST API) use

swh.web.client

Python client for swh.web

Dependencies

The dependency relationships among the various modules are depicted below.

_images/py-deps-swh.svg

Dependencies among top-level Python modules (click to zoom).