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One of the motivations for this change is the following Discourse discussion: https://discourse.dhall-lang.org/t/offline-use-of-prelude/137 Many users have requested Dhall support for "offline" packages that can be fetched/built/installed using ordinary package management tools (like Nix) instead of using Dhall's HTTP import system. I will continue to use the term "offline" to mean Dhall package builds that do not use Dhall's language support for HTTP imports (and instead use the package manager's support for HTTP requests, such as `pkgs.fetchFromGitHub`) The goal of this change is to document what is the idiomatic way to implement "offline" Dhall builds by implementing Nixpkgs support for such builds. That way when other package management tools ask me how to package Dhall with their tools I can refer them to how it is done in Nixpkgs. This change contains a fully "offline" build for the largest Dhall package in existence, known as "dhall-packages" (not to be confused with `dhallPackages`, which is our Nix attribute set containing Dhall packages). The trick to implementing offline builds in Dhall is to take advantage of Dhall's support for semantic integrity checks. If an HTTP import is protected by an integrity check and a cached build product matches the integrity check then the HTTP import is never resolved and the expression is instead fetched from cache. By "installing" dependencies in a pre-seeded and isolated cache we can replace remote HTTP imports with dependencies that have been built and supplied by Nix instead. The offline nature of the builds are enforced by compiling the Haskell interpreter with the `-f-with-http` flag, which disables the interpreter's support for HTTP imports. If a user forgets to supply a necessary dependency as a Nix build product then the build fails informing them that HTTP imports are disabled. By default, built packages are "binary distributions", containing just a cache product and a Dhall expression which can be used to resolve the corresponding cache product. Users can also optionally enable a "source distribution" of a package which already includes the equivalent fully-evaluated Dhall code (for convenience), but this is disabled by default to keep `/nix/store` utilization as compact as possible. |
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Nixpkgs is a collection of over 40,000 software packages that can be installed with the Nix package manager. It also implements NixOS, a purely-functional Linux distribution.
Manuals
- NixOS Manual - how to install, configure, and maintain a purely-functional Linux distribution
- Nixpkgs Manual - contributing to Nixpkgs and using programming-language-specific Nix expressions
- Nix Package Manager Manual - how to write Nix expressions (programs), and how to use Nix command line tools
Community
Other Project Repositories
The sources of all official Nix-related projects are in the NixOS organization on GitHub. Here are some of the main ones:
- Nix - the purely functional package manager
- NixOps - the tool to remotely deploy NixOS machines
- Nix RFCs - the formal process for making substantial changes to the community
- NixOS homepage - the NixOS.org website
- hydra - our continuous integration system
- NixOS Artwork - NixOS artwork
Continuous Integration and Distribution
Nixpkgs and NixOS are built and tested by our continuous integration system, Hydra.
- Continuous package builds for unstable/master
- Continuous package builds for the NixOS 19.09 release
- Tests for unstable/master
- Tests for the NixOS 19.09 release
Artifacts successfully built with Hydra are published to cache at https://cache.nixos.org/. When successful build and test criteria are met, the Nixpkgs expressions are distributed via Nix channels.
Contributing
Nixpkgs is among the most active projects on GitHub. While thousands of open issues and pull requests might seem a lot at first, it helps consider it in the context of the scope of the project. Nixpkgs describes how to build over 40,000 pieces of software and implements a Linux distribution. The GitHub Insights page gives a sense of the project activity.
Community contributions are always welcome through GitHub Issues and Pull Requests. When pull requests are made, our tooling automation bot, OfBorg will perform various checks to help ensure expression quality.
The Nixpkgs maintainers are people who have assigned themselves to maintain specific individual packages. We encourage people who care about a package to assign themselves as a maintainer. When a pull request is made against a package, OfBorg will notify the appropriate maintainer(s). The Nixpkgs committers are people who have been given permission to merge.
Most contributions are based on and merged into these branches:
masteris the main branch where all small contributions gostagingis branched from master, changes that have a big impact on Hydra builds go to this branchstaging-nextis branched from staging and only fixes to stabilize and security fixes with a big impact on Hydra builds should be contributed to this branch. This branch is merged into master when deemed of sufficiently high quality
For more information about contributing to the project, please visit the contributing page.
Donations
The infrastructure for NixOS and related projects is maintained by a nonprofit organization, the NixOS Foundation. To ensure the continuity and expansion of the NixOS infrastructure, we are looking for donations to our organization.
You can donate to the NixOS foundation by using Open Collective:
License
Nixpkgs is licensed under the MIT License.
Note: MIT license does not apply to the packages built by Nixpkgs, merely to the files in this repository (the Nix expressions, build scripts, NixOS modules, etc.). It also might not apply to patches included in Nixpkgs, which may be derivative works of the packages to which they apply. The aforementioned artifacts are all covered by the licenses of the respective packages.