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Nix, the purely functional package manager
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This is an example of "Parse, don't validate" principle [1]. Before, we had a number of `StringSet`s in `DerivationOptions` that were not *actually* allowed to be arbitrary sets of strings. Instead, each set member had to be one of: - a store path - a CA "downstream placeholder" - an output name Only later, in the code that checks outputs, would these strings be further parsed to match these cases. (Actually, only 2 by that point, because the placeholders must be rewritten away by then.) Now, we fully parse everything up front, and have an "honest" data type that reflects these invariants: - store paths are parsed, stored as (opaque) deriving paths - CA "downstream placeholders" are rewritten to the output deriving paths they denote - output names are the only arbitrary strings left Since the first two cases both become deriving paths, that leaves us with a `std::variant<SingleDerivedPath, String>` data type, which we use in our sets instead. Getting rid of placeholders is especially nice because we are replacing them with something much more internally-structured / transparent. [1]: https://lexi-lambda.github.io/blog/2019/11/05/parse-don-t-validate/ Co-authored-by: Sergei Zimmerman <sergei@zimmerman.foo> |
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Nix
Nix is a powerful package manager for Linux and other Unix systems that makes package management reliable and reproducible. Please refer to the Nix manual for more details.
Installation and first steps
Visit nix.dev for installation instructions and beginner tutorials.
Full reference documentation can be found in the Nix manual.
Building and developing
Follow instructions in the Nix reference manual to set up a development environment and build Nix from source.
Contributing
Check the contributing guide if you want to get involved with developing Nix.
Additional resources
Nix was created by Eelco Dolstra and developed as the subject of his PhD thesis The Purely Functional Software Deployment Model, published 2006. Today, a world-wide developer community contributes to Nix and the ecosystem that has grown around it.
- The Nix, Nixpkgs, NixOS Community on nixos.org
- Official documentation on nix.dev
- Nixpkgs is the largest, most up-to-date free software repository in the world
- NixOS is a Linux distribution that can be configured fully declaratively
- Discourse
- Matrix: #users:nixos.org for user support and #nix-dev:nixos.org for development
License
Nix is released under the LGPL v2.1.