42 lines
1.5 KiB
Markdown
42 lines
1.5 KiB
Markdown
# Overrides
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Each NixOS host follows one channel. But many times it is useful to get packages
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or modules from different channels.
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## Packages
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You can make use of `overlays/overrides.nix` to override specific packages in the
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default channel to be pulled from other channels. That file is simply an example
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of how any overlay can get `channels` as their first argument.
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You can add overlays to any channel to override packages from other channels.
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Pulling the manix package from the `latest` channel:
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```nix
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channels: final: prev: {
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__dontExport = true;
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inherit (pkgs.latest) manix;
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}
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```
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It is recommended to set the `__dontExport` property for override specific
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overlays. `overlays/overrides.nix` is the best place to consolidate all package
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overrides and the property is already set for you.
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## Modules
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You can also pull modules from other channels. All modules have access to the
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`modulesPath` for each channel as `<channelName>ModulesPath`. And you can use
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`disabledModules` to remove modules from the current channel.
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To pull zsh module from the `latest` channel this code can be placed in any module, whether its your host file, a profile, or a module in ./modules etc:
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```nix
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{ latestModulesPath }:
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{
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imports = [ "${latestModulesPath}/programs/zsh/zsh.nix" ];
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disabledModules = [ "programs/zsh/zsh.nix" ];
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}
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```
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> ##### _Note:_
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> Sometimes a modules name will change from one branch to another.
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[nixpkgs-modules]: https://github.com/NixOS/nixpkgs/tree/master/nixos/modules
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