commit aa62ee429a4d9d2526e2074fc678c545870d5f65 · soopy.moe/gensokyo

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docs/tips_n_tricks.md
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       *pointers by \@natsukagami*

     

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       # @ (at) syntax

     

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       ## @ (at) syntax

     

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       very simple.

     

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       ```nix

     
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       ```

     

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       from [nixos wiki](https://nixos.wiki/wiki/Nginx#LEMP_stack)

     

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       # adding a package with an overlay to a package set

     

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       ## adding a package with an overlay to a package set

     

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       for package sets with a scope, you will have to do something like

     

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       ```nix

     
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       however i do not think that's the best way lol

     

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       # Common pitfalls

     

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       ## importing nixpkgs with an empty attrset

     

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       ever had this in your flake.nix

     

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       ```nix

     

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       {

     

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         outputs = { nixpkgs, ... }@inputs: let

     

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           pkgs = import nixpkgs {};

     

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           lib = nixpkgs.lib;

     

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         in {

     

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           # ...

     

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         };

     

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       }

     

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       ```

     

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       ... and got fucked with this?

     

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       ```shell

     

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       error:

     

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              … while checking flake output 'nixosConfigurations'

     

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                at /nix/store/lz2ra1180qfffmpwg41jpyg1z602qdgx-source/flake.nix:50:5:

     

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                  49|   in {

     

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                  50|     nixosConfigurations = {

     

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                    |     ^

     

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                  51|       koumakan = (import ./systems/koumakan { inherit pkgs lib inputs; });

     

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              … while checking the NixOS configuration 'nixosConfigurations.koumakan'

     

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                at /nix/store/lz2ra1180qfffmpwg41jpyg1z602qdgx-source/flake.nix:51:7:

     

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                  50|     nixosConfigurations = {

     

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                  51|       koumakan = (import ./systems/koumakan { inherit pkgs lib inputs; });

     

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                    |       ^

     

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                  52|     };

     

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              (stack trace truncated; use '--show-trace' to show the full trace)

     

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              error: attribute 'currentSystem' missing

     

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              at /nix/store/5c0k827yjq7j24qaq8l2fcnsxp7nv8v1-source/pkgs/top-level/impure.nix:17:43:

     

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                  16|   # (build, in GNU Autotools parlance) platform.

     

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                  17|   localSystem ? { system = args.system or builtins.currentSystem; }

     

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                    |                                           ^

     

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                  18|

     

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       ```

     

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       just don't!!!11 remove the pkgs definition. (note that this only applies to `pkgs = import nixpkgs {};`)

     

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       ### explanation

     

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       > you shouldn't ever really import nixpkgs with an empty attrset either

     

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       >

     

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       > that causes it to fall back on guessing your system using `builtins.currentSystem`,

     

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       > which is impure and so not allowed in pure evaluation mode

     

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       — \@getchoo

     

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       ## Useful links

     

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       Builtin stdlib functions search engine: https://noogle.dev/