nixpkgs/doc/preface.chapter.md
Jan Tojnar 6ecc641d08
doc: prepare for commonmark
We are still using Pandoc’s Markdown parser, which differs from CommonMark spec slightly.

Notably:
- Line breaks in lists behave differently.
- Admonitions do not support the simpler syntax https://github.com/jgm/commonmark-hs/issues/75
- The auto_identifiers uses a different algorithm – I made the previous ones explicit.
- Languages (classes) of code blocks cannot contain whitespace so we have to use “pycon” alias instead of Python “console” as GitHub’s linguist

While at it, I also fixed the following issues:
- ShellSesssion was used
- Removed some pointless docbook tags.
2021-06-07 06:34:59 +02:00

47 lines
2.6 KiB
Markdown
Raw Permalink Blame History

This file contains ambiguous Unicode characters

This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

# Preface {#preface}
The Nix Packages collection (Nixpkgs) is a set of thousands of packages for the
[Nix package manager](https://nixos.org/nix/), released under a
[permissive MIT/X11 license](https://github.com/NixOS/nixpkgs/blob/master/COPYING).
Packages are available for several platforms, and can be used with the Nix
package manager on most GNU/Linux distributions as well as [NixOS](https://nixos.org/nixos).
This manual primarily describes how to write packages for the Nix Packages collection
(Nixpkgs). Thus its mainly for packagers and developers who want to add packages to
Nixpkgs. If you like to learn more about the Nix package manager and the Nix
expression language, then you are kindly referred to the [Nix manual](https://nixos.org/nix/manual/).
The NixOS distribution is documented in the [NixOS manual](https://nixos.org/nixos/manual/).
## Overview of Nixpkgs {#overview-of-nixpkgs}
Nix expressions describe how to build packages from source and are collected in
the [nixpkgs repository](https://github.com/NixOS/nixpkgs). Also included in the
collection are Nix expressions for
[NixOS modules](https://nixos.org/nixos/manual/index.html#sec-writing-modules).
With these expressions the Nix package manager can build binary packages.
Packages, including the Nix packages collection, are distributed through
[channels](https://nixos.org/nix/manual/#sec-channels). The collection is
distributed for users of Nix on non-NixOS distributions through the channel
`nixpkgs`. Users of NixOS generally use one of the `nixos-*` channels, e.g.
`nixos-19.09`, which includes all packages and modules for the stable NixOS
19.09. Stable NixOS releases are generally only given
security updates. More up to date packages and modules are available via the
`nixos-unstable` channel.
Both `nixos-unstable` and `nixpkgs` follow the `master` branch of the Nixpkgs
repository, although both do lag the `master` branch by generally
[a couple of days](https://status.nixos.org/). Updates to a channel are
distributed as soon as all tests for that channel pass, e.g.
[this table](https://hydra.nixos.org/job/nixpkgs/trunk/unstable#tabs-constituents)
shows the status of tests for the `nixpkgs` channel.
The tests are conducted by a cluster called [Hydra](https://nixos.org/hydra/),
which also builds binary packages from the Nix expressions in Nixpkgs for
`x86_64-linux`, `i686-linux` and `x86_64-darwin`.
The binaries are made available via a [binary cache](https://cache.nixos.org).
The current Nix expressions of the channels are available in the
[`nixpkgs`](https://github.com/NixOS/nixpkgs) repository in branches
that correspond to the channel names (e.g. `nixos-19.09-small`).