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# tops and bottoms

     

       
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this document outlines things that i learned from various sources and some pure guesswork

     

       
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## overriding packages

     

       
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the pill confused me and i thought i had to make overlays to do overrides but no

     

       
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(poorly made) example overlays can be found [here](https://github.com/soopyc/nixos-config/blob/master/overlays/discord-canary.nix)

     

       
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*note: replace `self: super:` with `final: prev:` for consistency*

     

       
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*concept and content by \@natsukagami*

     
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## extra opts

     

       
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a way of passing additional options globally to modules is by using extraOpts.

     

       
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<!-- find a way that we can still use this apart from in nixos config-->

     

       
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for example, check out this line in our flake.nix:

     

       
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https://github.com/soopyc/nix-on-koumakan/blob/8228dfc2c6e7aaa21b3f24f37699371837f25098/flake.nix#L22-L28

     

       
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this avoids the horror of `import ../../../utils/bar.nix;`

     

       
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refer to [nixpkgs:nixos/lib/eval-config.nix] and [nixpkgs:lib/modules.nix#122] for more info

     

       
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note that extraArgs is deprecated, so you will need to use config._module.args (i have no idea

     

       
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how this works)

     

       
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*pointers by \@natsukagami*

     

       
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···

       
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# tops and bottoms

     

       
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this document outlines things that i learned from various sources and some pure guesswork

     

       
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> To learn Nix is to learn to suffer, and to learn the way of numbing the pain

     

       
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— Cassie circa. 2023

     

       
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## overriding packages

     

       
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the pill confused me and i thought i had to make overlays to do overrides but no

     

       
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(poorly made) example overlays can be found [here](https://github.com/soopyc/nixos-config/blob/master/overlays/discord-canary.nix)

     

       
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currently in-use and slightly better overlays can be found in this repo! head over to /overlays to see them.

     

       
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*note: replace `self: super:` with `final: prev:` for consistency*

     

       
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*concept and content by \@natsukagami*

     
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## extra opts

     

       
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a way of passing additional options globally to modules is by using extraOpts.

     

       
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in nix flakes, this is accomplished by using `specialArgs` in `nixosSystem`.

     

       
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for example, check out this line in our flake.nix:

     

       
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https://github.com/soopyc/nix-on-koumakan/blob/492dfaa01808c2aa5dbb2d8223163e92bcef673b/flake.nix#L22-L28

     

       
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this avoids the horror of `import ../../../utils/bar.nix;`

     

       
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refer to [nixpkgs:nixos/lib/eval-config.nix] and [nixpkgs:lib/modules.nix#122] for more info

     

       
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*pointers by \@natsukagami*

     

       
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