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nixos/eval-config: Deprecate NIXOS_EXTRA_MODULE_PATH

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This gets rid of a potentially confusing behavior that doesn't need to
be in NixOS, and nobody ever bothered to add a test for it.
Let's keep things simple!
The suggested snippet is better than this feature ever was, and will be
in the user's face, where it belongs, kindly.

Tested with

    nix-instantiate nixos/lib/eval-config.nix --arg modules '[{fileSystems."/".device="x";boot.loader.grub.enable=false;}]' -A config.system.build.toplevel
    NIXOS_EXTRA_MODULE_PATH=$HOME/whatever.nix nix-instantiate nixos/lib/eval-config.nix --arg modules '[{fileSystems."/".device="x";boot.loader.grub.enable=false;}]' -A config.system.build.toplevel
This commit is contained in:
Robert Hensing 2024-10-18 16:54:07 +02:00
parent 4ba22a8820
commit 5f197bf5d0
3 changed files with 24 additions and 31 deletions
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28
nixos/doc/manual/development/importing-modules.section.md
View file

@ -16,31 +16,3 @@ outside of Nixpkgs. These modules can be imported:
services.exampleModule.enable = true;
}
```
The environment variable `NIXOS_EXTRA_MODULE_PATH` is an absolute path
to a NixOS module that is included alongside the Nixpkgs NixOS modules.
Like any NixOS module, this module can import additional modules:
```nix
# ./module-list/default.nix
[
./example-module1
./example-module2
]
```
```nix
# ./extra-module/default.nix
{ imports = import ./module-list.nix; }
```
```nix
# NIXOS_EXTRA_MODULE_PATH=/absolute/path/to/extra-module
{ config, lib, pkgs, ... }:
{
# No `imports` needed
services.exampleModule1.enable = true;
}
```

2
nixos/doc/manual/development/meta-attributes.section.md
View file

@ -45,7 +45,7 @@ file.
- `buildDocsInSandbox` indicates whether the option documentation for the
module can be built in a derivation sandbox. This option is currently only
honored for modules shipped by nixpkgs. User modules and modules taken from
`NIXOS_EXTRA_MODULE_PATH` are always built outside of the sandbox, as has
`extraModules` are always built outside of the sandbox, as has
been the case in previous releases.
Building NixOS option documentation in a sandbox allows caching of the built