move overrides.nix to overlays
also update overrides docs it is a pure devos overlay now, it makes sense to go in overlays
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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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This is what the overrides are for. You can make use of the `overrides.nix` to
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override specific packages to be pulled from other channels. Any overlay may get
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`channels` as their first argument.
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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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## Example
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You can add overlays to any channel to override packages from other channels.
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### Packages
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The override packages are defined as a regular overlay with an extra arguement
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`channels`. This refers to all channels defined in `flake.nix`.
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Pulling the manix package from the latest flake:
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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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inherit (pkgs.latest) manix;
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}
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```
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### Modules
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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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Pulling the zsh module from the latest flake:
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Pulling the zsh module from the `latest` channel:
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```nix
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{ latestModulesPath }: {
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modules = [ "${latestModulesPath}/programs/zsh/zsh.nix" ];
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@ -45,7 +45,6 @@
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(devos.lib.pathsIn ./overlays)
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./pkgs/default.nix
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pkgs.overlay # for `srcs`
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./overrides.nix # from "latest" channel
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nur.overlay
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];
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};
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