Overlays: Difference between revisions
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→Overriding a package inside a scope
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== Data flow of overlays == | == Data flow of overlays == | ||
The data flow | The data flow of overlays, especially regarding <tt>prev</tt> and <tt>final</tt> arguments can be a bit confusing if you are not familiar with how overlays work. This graph shows the data flow: | ||
[[File:Dram-overlay-final-prev.png]] | [[File:Dram-overlay-final-prev.png]] | ||
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And <syntaxhighlight lang="nix">final: prev: firefox = final.firefox.override { ... };</syntaxhighlight> would cause infinite recursion. | And <syntaxhighlight lang="nix">final: prev: { firefox = final.firefox.override { ... }; }</syntaxhighlight> would cause infinite recursion. | ||
== Using overlays == | == Using overlays == | ||
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</syntaxhighlight> | </syntaxhighlight> | ||
Then, add the following contents to <tt>/etc/nixos/overlays-compat/overlays.nix</tt><ref>Based on [https://gitlab.com/samueldr/nixos-configuration/blob/3febd83b15210282d6435932944d426cd0a9e0ca/modules/overlays-compat/overlays.nix [[User: | Then, add the following contents to <tt>/etc/nixos/overlays-compat/overlays.nix</tt><ref>Based on [https://gitlab.com/samueldr/nixos-configuration/blob/3febd83b15210282d6435932944d426cd0a9e0ca/modules/overlays-compat/overlays.nix][[User:Samueldr|@samueldr]]<span>'s configuration: overlays-compat</span></ref>: | ||
<syntaxhighlight lang="nix"> | <syntaxhighlight lang="nix"> | ||
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final: prev: { | final: prev: { | ||
# elements of pkgs.gnome must be taken from gfinal and gprev | # elements of pkgs.gnome must be taken from gfinal and gprev | ||
gnome = prev.gnome.overrideScope | gnome = prev.gnome.overrideScope (gfinal: gprev: { | ||
mutter = gprev.mutter.overrideAttrs (oldAttrs: { | mutter = gprev.mutter.overrideAttrs (oldAttrs: { | ||
patches = oldAttrs.patches ++ [ | patches = oldAttrs.patches ++ [ | ||
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* [https://nixos.org/manual/nixpkgs/unstable/#using-community-maintained-rust-toolchains Details in the Nixpkgs manual for using Rust overlays] | * [https://nixos.org/manual/nixpkgs/unstable/#using-community-maintained-rust-toolchains Details in the Nixpkgs manual for using Rust overlays] | ||
* [https://github.com/peter-sa/nixos-rocm Overlay for Radeon Open-Compute packages] | * [https://github.com/peter-sa/nixos-rocm Overlay for Radeon Open-Compute packages] | ||
* [https://github.com/garbas/nixpkgs-python Overlay by Rok Garbas for a set of python packages built by pypi2nix] | * [https://github.com/garbas/nixpkgs-python Overlay by Rok Garbas for a set of python packages built by pypi2nix (archived)] | ||
== See also == | == See also == | ||
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* [https://nixos.org/nixpkgs/manual/#chap-overlays Overlays in nixpkgs manual] | * [https://nixos.org/nixpkgs/manual/#chap-overlays Overlays in nixpkgs manual] | ||
* [https://blog.flyingcircus.io/2017/11/07/nixos-the-dos-and-donts-of-nixpkgs-overlays/ Blog post "The DOs and DON’Ts of nixpkgs overlays"] | * [https://blog.flyingcircus.io/2017/11/07/nixos-the-dos-and-donts-of-nixpkgs-overlays/ Blog post "The DOs and DON’Ts of nixpkgs overlays"] | ||
* [https://www.youtube.com/watch?v=s2fkgkN55vk&list=PLgknCdxP89ReD6gxl755B6G_CI65z4J2e Nixpkgs Overlays – A place for all excluded packages] - Talk by Nicolas B. Pierron at NixCon 2017 | |||
==== References ==== | ==== References ==== | ||