Nixos configuration imports (absolute) path vs string error: string './config/z_device_P340.nix' doesn't represent an absolute path

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1 
device_P340     = "P340" ; 
 imports =
    [

    ./config/z_device_P340.nix # works but isn't proper as it contains a variable as fix string
    "./config/z_device_${device}.nix" # issue 

        ];

error: string './config/z_device_P340.nix' doesn't represent an absolute path

builtins.asPath does not change it

What is the current correct way in nixos?

2 
device_P340     = "P340" ; 
 imports =
    [
      ./config/z_device_${device}.nix
    ];

Probably. Imports expect actual paths, not strings. No, paths are just resolved to be absolute at runtime. Interpolation works on those too, afaik.

Edit: yes, and it’s apparently called anti-quotation: Data Types

3

Path interpolation is a recent thing.

If path interpolation is not available in OPs version, then building a path programatically is like ./config + "/z_device_${device}.nix"

1 Like
4 
 - system: `"x86_64-linux"`
 - host os: `Linux 5.15.64, NixOS, 22.05 (Quokka), 22.05.2992.45b56b5321a`
 - multi-user?: `yes`
 - sandbox: `yes`
 - version: `nix-env (Nix) 2.8.1`
 - channels(root): `"home-manager-22.05.tar.gz, nixos-22.05"`
 - channels(a): `""`
 - nixpkgs: `/nix/var/nix/profiles/per-user/root/channels/nixos`

building Nix...
error: syntax error, unexpected '+'
5
  1. 2.8 does not have path interpolation
  2. you might need to wrap the expression in parenthesis to staisfy the parser. This is especially true in lists
6

thanks, looks to work as well