Software Heritage safeguards against platform shutdowns by archiving code from various sources.
Efficient storage achieved through deduplication and graph representation of code elements.
Software Heritage ID and cryptographic hashes ensure secure, traceable code preservation.
Deep dives
Software Heritage: Preserving Source Code for Cultural Heritage and Open Science
Software Heritage is a global initiative aiming to build a comprehensive library of all publicly available source code, akin to a 'Library of Alexandria.' It serves various needs like cultural heritage preservation, open science, academia, industry, and public administration. By collecting source code from various platforms beyond GitHub, like tiny forges and package managers, Software Heritage ensures the preservation and accessibility of mankind's software in a single repository.
Addressing Data Preservation Challenges through Software Heritage
Software Heritage was born from the need to prevent the loss of valuable software due to platforms shutdowns or changes. With large platforms like Google Code and Bitbucket phasing out, Software Heritage became crucial in safeguarding software as part of technological and cultural heritage. It utilizes a 'save code now' mechanism for immediate archiving and implements a mirror program to ensure data redundancy and protect against legal challenges that may endanger preservation efforts.
Technical Infrastructure and Data Storage of Software Heritage
Software Heritage employs object storage for file contents using ZFS with plans to transition to Ceph for efficiency. It stores data in a graph structure, representing the relationships among code elements using a Merkle graph. By deduplicating identical code across different projects, Software Heritage achieves significant compression ratios, ensuring efficient storage and retrieval of source code over time.
Software Heritage ID and Cryptographic Hashes
The podcast episode delves into the concept of Software Heritage ID and cryptographic hashes for long-term preservation. The Software Heritage ID, also known as SWHID, serves as a cryptographic identifier, ensuring the integrity and traceability of software components globally. By using cryptographic hashes like SHA-1 or potentially others like SHA-256, identifiers are computed to uniquely represent files, directories, and even the entire content of a directory. This process allows for secure identification and tracking of changes within software projects, aiding in version control and ensuring the authenticity of code.
Building a Universal Archive with Software Heritage
The episode explores the importance of the Software Heritage initiative in creating a universal archive for software source code. Software development is emphasized as a form of art that contributes to collective human knowledge. The Software Heritage infrastructure provides a revolutionary platform for research, industry, and cultural heritage preservation. With evolving use cases, including cybersecurity enhancements through software traceability and integrity checks, the initiative calls for support and contribution from software engineers and industry professionals to build a sustainable and secure software ecosystem.
Roberto Di Cosmo, Computer Science professor at University Paris Diderot and founder of the Software Heritage initiative, discusses how to protect against sudden loss from the collapse of a "free" source code repository provider, how to protect...
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