68 lines
2.2 KiB
Markdown
68 lines
2.2 KiB
Markdown
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# Profiles
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Profiles are a convenient shorthand for the [_definition_][definition] of
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[options][options] in contrast to their [_declaration_][declaration]. They're
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built into the NixOS module system for a reason: to elegantly provide a clear
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separation of concerns.
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## Creation
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Profiles are created with the `rakeLeaves` function which recursively collects
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`.nix` files from within a folder. The recursion stops at folders with a `default.nix`
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in them. You end up with an attribute set with leaves(paths to profiles) or
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nodes(attrsets leading to more nodes or leaves).
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A profile is used for quick modularization of [interelated bits](./profiles.md#subprofiles).
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> ##### _Notes:_
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> * For _declaring_ module options, there's the [modules](../outputs/modules.md) directory.
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> * This directory takes inspiration from
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> [upstream](https://github.com/NixOS/nixpkgs/tree/master/nixos/modules/profiles)
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> .
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### Nested profiles
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Profiles can be nested in attribute sets due to the recursive nature of `rakeLeaves`.
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This can be useful to have a set of profiles created for a specific purpose. It is
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sometimes useful to have a `common` profile that has high level concerns related
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to all its sister profiles.
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### Example
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profiles/develop/common.nix:
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```nix
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{
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imports = [ ./zsh ];
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# some generic development concerns ...
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}
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```
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profiles/develop/zsh.nix:
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```nix
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{ ... }:
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{
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programs.zsh.enable = true;
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# zsh specific options ...
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}
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```
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The examples above will end up with a profiles set like this:
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```nix
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{
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develop = {
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common = ./profiles/develop/common.nix;
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zsh = ./profiles/develop/zsh.nix;
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};
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}
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```
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## Conclusion
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Profiles are the most important concept in DevOS. They allow us to keep our
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Nix expressions self contained and modular. This way we can maximize reuse
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across hosts while minimizing boilerplate. Remember, anything machine
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specific belongs in your [host](hosts.md) files instead.
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[definition]: https://nixos.org/manual/nixos/stable/index.html#sec-option-definitions
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[declaration]: https://nixos.org/manual/nixos/stable/index.html#sec-option-declarations
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[options]: https://nixos.org/manual/nixos/stable/index.html#sec-writing-modules
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[spec]: https://github.com/divnix/devos/tree/core/lib/devos/mkProfileAttrs.nix
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[config]: https://nixos.wiki/wiki/Module#structure
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