66 lines
1.9 KiB
Markdown
66 lines
1.9 KiB
Markdown
# Packages
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Similar to [modules](./modules.md), the pkgs directory mirrors the upstream
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[nixpkgs/pkgs][pkgs], and for the same reason; if you ever want to upstream
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your package, it's as simple as dropping it into the nixpkgs/pkgs directory.
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The only minor difference is that, instead of adding the `callPackage` call to
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`all-packages.nix`, you just add it the the _default.nix_ in this directory,
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which is defined as a simple overlay.
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This overlay is set as the default `overlay` output attribute for the flake.
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And all the packages are exported via `packages.<system>.<pkg-name>`, for all
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the supported systems listed in the package's `meta.platforms` attribute.
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And, as usual, every package in the overlay is also available to any NixOS
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[host](../concepts/hosts.md).
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## Automatic Source Updates
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There is the added, but optional, convenience of declaring your sources in
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_pkgs/flake.nix_ as an input. You can then access them from the `srcs` package.
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This allows updates to be managed automatically by simply
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[updating](../flk/update.md#updating-package-sources) the lock file. No
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more manually entering sha256 hashes!
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As an added bonus, version strings are also generated automatically from either
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the flake ref, or the date and git revision of the source.
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## Example
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pkgs/development/libraries/libinih/default.nix:
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```nix
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{ stdenv, meson, ninja, lib, srcs, ... }:
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let inherit (srcs) libinih; in
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stdenv.mkDerivation {
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pname = "libinih";
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# version will resolve to 53, as specified in the final example below
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inherit (libinih) version;
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src = libinih;
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buildInputs = [ meson ninja ];
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# ...
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}
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```
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pkgs/default.nix:
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```nix
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final: prev: {
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libinih = prev.callPackage ./development/libraries/libinih { };
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}
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```
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pkgs/flake.nix:
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```nix
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{
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description = "Package sources";
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inputs = {
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libinih.url = "github:benhoyt/inih/r53";
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libinih.flake = false;
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};
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}
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```
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[pkgs]: https://github.com/NixOS/nixpkgs/tree/master/pkgs
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