[Bug] evaluation warning: 'system' has been renamed to/replaced by 'stdenv.hostPlatform.system'

[charliie-dev]

Description

When running home-manager switch with charmbracelet/nur packages, the log will show an warning:

evaluation warning: 'system' has been renamed to/replaced by 'stdenv.hostPlatform.system'

since pkgs.system is deprecated in NixOS 25.11, and 25.11 just got branched out. I think it's time to fix those warnings.

---

I traced the issue via adding

(self: super: {
  system = builtins.throw "Do not read pkgs.system; use stdenv.hostPlatform.system";
})

to nixpkgs' overlays and running NIX_SHOW_TRACES=1 home-manager switch --show-trace.
Both pkgs.nur.repos.charmbracelet.glow and pkgs.nur.repos.charmbracelet.crush shows similar errors:

...
       … while calling the 'derivationStrict' builtin
         at «nix-internal»/derivation-internal.nix:37:12:
           36|
           37|   strict = derivationStrict drvAttrs;
             |            ^
           38|

       … while evaluating derivation 'glow-2.1.1'
         whose name attribute is located at «github:nixos/nixpkgs/5ae3b07»/pkgs/stdenv/generic/make-derivation.nix:541:13

       … while evaluating attribute 'sourceRoot' of derivation 'glow-2.1.1'
         at /nix/store/50ci4i5gz83g6x33116vrp64xf1k4lyw-source/pkgs/glow/default.nix:45:3:
           44|
           45|   sourceRoot = sourceRootMap.${system};
             |   ^
           46|

       … while calling the 'throw' builtin
         at /Users/charles/.config/home-manager/modules/hosts/m3pro.nix:22:20:
           21|         (self: super: {
           22|           system = builtins.throw "Do not read pkgs.system; use stdenv.hostPlatform.system";
             |                    ^
           23|         })

       error: Do not read pkgs.system; use stdenv.hostPlatform.system

and

...
       … while evaluating derivation 'crush-0.18.6'
         whose name attribute is located at «github:nixos/nixpkgs/5ae3b07»/pkgs/stdenv/generic/make-derivation.nix:541:13

       … while evaluating attribute 'sourceRoot' of derivation 'crush-0.18.6'
         at /nix/store/50ci4i5gz83g6x33116vrp64xf1k4lyw-source/pkgs/crush/default.nix:45:3:
           44|
           45|   sourceRoot = sourceRootMap.${system};
             |   ^
           46|

       … while calling the 'throw' builtin
         at /Users/charles/.config/home-manager/modules/hosts/m3pro.nix:22:20:
           21|         (self: super: {
           22|           system = builtins.throw "Do not read pkgs.system; use stdenv.hostPlatform.system";
             |                    ^
           23|         })

       error: Do not read pkgs.system; use stdenv.hostPlatform.system

---

My current workaround is patching the files by patching pkgs/crush/default.nix with:

{
-  system ? builtins.currentSystem
, lib
, fetchurl
, installShellFiles
, stdenvNoCC
}:
let 
+ inherit (stdenvNoCC.hostPlatform) system;

  shaMap = {
    i686-linux     = "1jzrjyynagjs1kdj48c799mb5qa12sr5x4aqhh905i7ngjidm67n";
    x86_64-linux   = "035kyby7r1dwms0lgywhbj6k3c6gc5bgx26a7fjnvzfy43mjksd6";
    armv7l-linux   = "0yapkhwfrzw9giaangzds7fdnfrcl13bldvfk1jj04l31kvsapgx";
    aarch64-linux  = "0s8vdr5apa9gi7aayw6ah7xdxdqzfskpvq36xv29nvfn08k2q3xz";
    x86_64-darwin  = "1pl60rvhgj0j1rxl2ghpwibcn2x4siw561g5yafx4dyqs7g0fhz8";
    aarch64-darwin = "1w4hikw7yzhfxrkk2srs0yqy02n54diq42f1ms0h1gsbl9f20yhg";
  };
...
in 
...

-  system = system;
...

With this patch, the warning is now gone.

Version

master

Environment

macOS 26.1 and Ubuntu 24.05 / ghostty / nix (Determinate Nix 3.13.2) 2.32.4 with home-manager 25.11

[charliie-dev]

https://nixos.org/blog/announcements/2025/nixos-2511/