nixpkgs-multiverse: every version that ever existed
Summary
The article introduces nixpkgs-multiverse, a project that makes every historic nixpkgs revision available as a single input. It explains motivations behind pinning multiple nixpkgs inputs, the data architecture with revisions.json and versions.json, and the performance benefits of evaluating a single revision across many packages. Practical examples show how to query versions, pin revisions, and use at to target specific revisions.