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Nixpkgs/Patching Nixpkgs: Difference between revisions

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replace importing nixpkgs: https://discourse.nixos.org/t/1000-instances-of-nixpkgs/17347 with existing NixOS module param `pkgs`, and replace fetchurl with fetchpatch2 that will do normalization on generated patch
 
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First you will need to apply the Nixpkgs PR patch to some copy of Nixpkgs. In this example we will assume a Flake (<code>flake.nix</code>) that has an input <code>nixpkgs-unstable</code> pointing to <code>nixos-unstable</code>:
First you will need to apply the Nixpkgs PR patch to some copy of Nixpkgs. In this example we will assume a NixOS modules has parameter <code>pkgs</code> pointing to <code>nixos-unstable</code>.
 
<syntaxHighlight lang=nix>
inputs = {
  # ...
  nixpkgs-unstable.url = "github:NixOS/nixpkgs/nixos-unstable";
  # ...
};
</syntaxHighlight>
 
We will use the [https://noogle.dev/f/pkgs/applyPatches <code>applyPatches</code>] function to apply the unmerged PR changes to
We will use the [https://noogle.dev/f/pkgs/applyPatches <code>applyPatches</code>] function to apply the unmerged PR changes to
<code>nixpkgs-unstable</code>. First we need to covert the PR to a patch, which can be done by appending
<code>nixpkgs-unstable</code>. First we need to covert the PR to a patch, which can be done by appending
<code>.patch</code> to the github PR
<code>.patch</code> to the github PR
url. This will redirect to another link, for example https://github.com/NixOS/nixpkgs/pull/344917.patch will
url. This will redirect to another link, for example https://github.com/NixOS/nixpkgs/pull/344917.patch will
redirect to https://patch-diff.githubusercontent.com/raw/NixOS/nixpkgs/pull/344917.patch. We can use the latter.
redirect to https://patch-diff.githubusercontent.com/raw/NixOS/nixpkgs/pull/344917.patch. Then we can use <code>[https://nixos.org/manual/nixpkgs/stable/#fetchpatch fetchpatch]</code> or <code>[https://noogle.dev/f/pkgs/fetchpatch2 fetchpatch2]</code> to normalize this patch that generated by GitHub:


<syntaxhighlight lang="nix">
<syntaxhighlight lang="nix">
{ pkgs, ... }:
let
let
   nixpkgs-unstable' =
   nixpkgs-344917-drv =
    ((import nixpkgs-unstable {
     pkgs.applyPatches {
      system = "x86_64-linux";
       src = pkgs.path;
     }).applyPatches
      patches = [
       {
        (pkgs.fetchpatch2 {
        name = "nixpkgs-unstable-patched";
          url = "https://github.com/NixOS/nixpkgs/pull/344917.patch";
        src = inputs.nixpkgs-unstable;
          sha256 = "sha256-aws9J5ZNUyz4Z2RqPVEovBTNng4AdhzS03Bqg8jejWQ=";
        patches = [
        })
          (builtins.fetchurl {
      ];
            url = "https://patch-diff.githubusercontent.com/raw/NixOS/nixpkgs/pull/344917.patch";
    };
            sha256 = "sha256-aws9J5ZNUyz4Z2RqPVEovBTNng4AdhzS03Bqg8jejWQ=";
   nixpkgs-344917 = import nixpkgs-344917-drv { inherit (pkgs.stdenv) system; };
          })
in
        ];
      }).src;
   lib = nixpkgs-unstable'.lib;
  pkgs-unstable-patched = import nixpkgs-unstable' {
    system = "x86_64-linux";
  };
# ...
# ...
</syntaxhighlight>
</syntaxhighlight>


In the above example we create a derivation with the patch applied, called <code>nixpkgs-unstable'</code>. Pay attention we take the <code>src</code> attribute to get back the top-level (unpatched) nixpkgs. We can then access <code>lib</code> functions normally. We then import that new
In the above example we create a derivation with the patch applied, called <code>nixpkgs-344917-drv</code>. Pay attention we take the <code>src</code> attribute to get back the original (unpatched) nixpkgs. We then import that new derivation which we assign to <code>nixpkgs-344917</code>. Now we can use <code>nixpkgs-344917</code> to access the
derivation which we assign to <code>pkgs-unstable-patched</code>. Now we can use <code>pkgs-unstable-patched</code> to access the
Ghidra 11.2 package, as well as any other packages normally available in nixpkgs.
Ghidra 11.2 package, as well as any other packages normally available in nixpkgs.


Retrieved from "https://wiki.nixos.org/wiki/Nixpkgs/Patching_Nixpkgs"