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Software Heritage Loader Archive Soware Heritage Preserving the Free Soware Commons Roberto Di Cosmo and Stefano Zacchiroli [email protected],[email protected] 4 February 2017 FOSDEM’17 Brussels, Belgium R. Di Cosmo, S. Zacchiroli Soware Heritage FOSDEM’17 1 / 24 Free Soware is everywhere Software R. Di Cosmo, S. Zacchiroli Soware Heritage FOSDEM’17 2 / 24 Soware Source Code is special Harold Abelson, Structure and Interpretation of Computer Programs “Programs must be wrien for people to read, and only incidentally for machines to execute.” ake 2 source code (excerpt) Net. queue in Linux (excerpt) Len Shustek, Computer History Museum “Source code provides a view into the mind of the designer.” R. Di Cosmo, S. Zacchiroli Soware Heritage FOSDEM’17 3 / 24 Source code is a precious part of our commons are we taking care of it? Our Soware Commons Definition (Commons) The commons is the cultural and natural resources accessible to all members of a society, including natural materials such as air, water, and a habitable earth. These resources are held in common, not owned privately. https://en.wikipedia.org/wiki/Commons Definition (Soware Commons) The soware commons consists of all computer soware which is available at lile or no cost and which can be altered and reused with few restrictions. Thus all open source soware and all free soware are part of the [soware] commons. [...] https://en.wikipedia.org/wiki/Software_Commons R. Di Cosmo, S. Zacchiroli Soware Heritage FOSDEM’17 4 / 24 Our Soware Commons Definition (Commons) The commons is the cultural and natural resources accessible to all members of a society, including natural materials such as air, water, and a habitable earth. These resources are held in common, not owned privately. https://en.wikipedia.org/wiki/Commons Definition (Soware Commons) The soware commons consists of all computer soware which is available at lile or no cost and which can be altered and reused with few restrictions. Thus all open source soware and all free soware are part of the [soware] commons. [...] https://en.wikipedia.org/wiki/Software_Commons Source code is a precious part of our commons are we taking care of it? R. Di Cosmo, S. Zacchiroli Soware Heritage FOSDEM’17 4 / 24 Wehere is the place ... where we can find, track and search all source code? Soware is spread all around Fashion victims many disparate development platforms a myriad places where distribution may happen projects tend to migrate from one place to another over time R. Di Cosmo, S. Zacchiroli Soware Heritage FOSDEM’17 5 / 24 Soware is spread all around Fashion victims many disparate development platforms a myriad places where distribution may happen projects tend to migrate from one place to another over time Wehere is the place ... where we can find, track and search all source code? R. Di Cosmo, S. Zacchiroli Soware Heritage FOSDEM’17 5 / 24 Where is the archive... where we go if (a repository on) GitHub or GitLab goes away? Soware is fragile Like all digital information, FOSS is fragile inconsiderate and/or malicious code loss (e.g., Code Spaces) business-driven code loss (e.g., Gitorious, Google Code) for obsolete code: physical media decay (data rot) R. Di Cosmo, S. Zacchiroli Soware Heritage FOSDEM’17 6 / 24 Soware is fragile Like all digital information, FOSS is fragile inconsiderate and/or malicious code loss (e.g., Code Spaces) business-driven code loss (e.g., Gitorious, Google Code) for obsolete code: physical media decay (data rot) Where is the archive... where we go if (a repository on) GitHub or GitLab goes away? R. Di Cosmo, S. Zacchiroli Soware Heritage FOSDEM’17 6 / 24 If you study the stars, you go to Atacama... ... where is the very large telescope of source code? Soware is missing its own Research Infrastructure Photo: ALMA(ESO/NAOJ/NRAO), R. Hills A wealth of soware research on crucial issues... safety, security; test, verification, proof; soware engineering, soware evolution; empirical and big data studies; R. Di Cosmo, S. Zacchiroli Soware Heritage FOSDEM’17 7 / 24 Soware is missing its own Research Infrastructure Photo: ALMA(ESO/NAOJ/NRAO), R. Hills A wealth of soware research on crucial issues... safety, security; test, verification, proof; soware engineering, soware evolution; empirical and big data studies; If you study the stars, you go to Atacama... ... where is the very large telescope of source code? R. Di Cosmo, S. Zacchiroli Soware Heritage FOSDEM’17 7 / 24 The Soware Heritage Project THE GREAT LIBRARY OF SOURCE CODE Our mission Collect, preserve and share the source code of all the soware that lies at the heart of our culture and our society. Past, present and future Preserving the past, enhancing the present, preparing the future. R. Di Cosmo, S. Zacchiroli Soware Heritage FOSDEM’17 8 / 24 Open approach In for the long haul 100% FOSS replication transparency non profit Our principles R. Di Cosmo, S. Zacchiroli Soware Heritage FOSDEM’17 9 / 24 Our principles Open approach In for the long haul 100% FOSS replication transparency non profit R. Di Cosmo, S. Zacchiroli Soware Heritage FOSDEM’17 9 / 24 Archiving goals Targets: VCS repositories & source code releases (e.g., tarballs) We DO archive file content (= blobs) revisions (= commits), with full metadata releases (= tags), dio where (origin) & when (visit) we found any of the above ... in a VCS-/archive-agnostic canonical data model We DON’T archive homepages, wikis BTS/issues/code reviews/etc. mailing lists Long term vision: play our part in a "semantic wikipedia of soware" R. Di Cosmo, S. Zacchiroli Soware Heritage FOSDEM’17 10 / 24 Data flow Forges software GitHub origins lister Git loader git git GitLab lister git Mercurial git Software Heritage loader Archive . svn hg . svn hg . Distros Merkle DAG . hg . svn + dsc blob storage Debian Debian source dsc lister package loader tar PyPi zip tar loader lister Package repos Listing Loading ... (full/incremental) & deduplication Scheduling R. Di Cosmo, S. Zacchiroli Soware Heritage FOSDEM’17 11 / 24 Classical cryptographic construction fast, parallel signature of large data structures widely used (e.g., Git, Bitcoin, IPFS, ...) built-in deduplication Merkle trees Merkle tree (R. C. Merkle, Crypto 1979) Combination of tree hash function R. Di Cosmo, S. Zacchiroli Soware Heritage FOSDEM’17 12 / 24 Merkle trees Merkle tree (R. C. Merkle, Crypto 1979) Combination of tree hash function Classical cryptographic construction fast, parallel signature of large data structures widely used (e.g., Git, Bitcoin, IPFS, ...) built-in deduplication R. Di Cosmo, S. Zacchiroli Soware Heritage FOSDEM’17 12 / 24 Example: a Soware Heritage revision Note: most object kinds currently have Git-compatible identifiers R. Di Cosmo, S. Zacchiroli Soware Heritage FOSDEM’17 13 / 24 The archive: a (giant) Merkle DAG R. Di Cosmo, S. Zacchiroli Soware Heritage FOSDEM’17 14 / 24 Some numbers 150 TB blobs, 6 TB database (as a graph: 5 B nodes + 50 B edges) The richest source code archive already, ... and growing daily! Archive coverage Our sources GitHub — full, up-to-date mirror Debian — daily snapshots of all suites since 2005–2015 GNU — all releases as of August 2015 Gitorious, Google Code — local copy (Archive Team & Google) R. Di Cosmo, S. Zacchiroli Soware Heritage FOSDEM’17 15 / 24 The richest source code archive already, ... and growing daily! Archive coverage Our sources GitHub — full, up-to-date mirror Debian — daily snapshots of all suites since 2005–2015 GNU — all releases as of August 2015 Gitorious, Google Code — local copy (Archive Team & Google) Some numbers 150 TB blobs, 6 TB database (as a graph: 5 B nodes + 50 B edges) R. Di Cosmo, S. Zacchiroli Soware Heritage FOSDEM’17 15 / 24 Archive coverage Our sources GitHub — full, up-to-date mirror Debian — daily snapshots of all suites since 2005–2015 GNU — all releases as of August 2015 Gitorious, Google Code — local copy (Archive Team & Google) Some numbers 150 TB blobs, 6 TB database (as a graph: 5 B nodes + 50 B edges) The richest source code archive already, ... and growing daily! R. Di Cosmo, S. Zacchiroli Soware Heritage FOSDEM’17 15 / 24 Features pointwise browsing of the Soware Heritage archive ... releases → revisions → directories → contents ... full access to the metadata of archived objects crawling information when have you last visited this Git repository I care about? where were its branches/tags pointing to at the time? Complete endpoint index https://archive.softwareheritage.org/api/1/ Web API (FOSDEM’17 release) Fresh from the oven: first public version of our Web API https://archive.softwareheritage.org/api/ R. Di Cosmo, S. Zacchiroli Soware Heritage FOSDEM’17 16 / 24 Complete endpoint index https://archive.softwareheritage.org/api/1/ Web API (FOSDEM’17 release) Fresh from the oven: first public version of our Web API https://archive.softwareheritage.org/api/ Features pointwise browsing of the Soware Heritage archive ... releases → revisions → directories → contents ... full access to the metadata of archived objects crawling information when have you last visited this Git repository I care about? where were its branches/tags pointing to at the time? R. Di Cosmo, S. Zacchiroli Soware Heritage FOSDEM’17 16 / 24 Web API (FOSDEM’17 release) Fresh from the oven: first public version of our Web API https://archive.softwareheritage.org/api/ Features pointwise browsing of the Soware Heritage archive ... releases → revisions → directories → contents ... full access to the metadata of archived objects crawling information when have you last visited this Git repository I care about? where were its branches/tags pointing to at the time? Complete endpoint index https://archive.softwareheritage.org/api/1/ R. Di Cosmo, S. Zacchiroli Soware Heritage FOSDEM’17 16 / 24 A tour of the Web API — origins & visits GET https://archive.softwareheritage.org/api/1/origin/ \ git/url/https://github.com/hylang/hy { "id": 1, "origin_visits_url": "/api/1/origin/1/visits/", "type": "git", "url": "https://github.com/hylang/hy" } GET https://archive.softwareheritage.org/api/1/origin/ \ 1/visits/ [ ..., { "date": 1473851066.769266, "origin": 1, "origin_visit_url": "/api/1/origin/1/visit/13/", "status": "full", "visit": 13 }, ..
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