2019-12-03 06:18:30 +01:00
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# Introduction
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2020-01-05 11:43:28 +01:00
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A NixOS configuration template using the experimental [flakes][rfc] mechanism.
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Its aim is to provide a generic repository which neatly separates concerns
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and allows one to get up and running with NixOS faster than ever.
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2020-01-04 04:23:13 +01:00
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2020-01-04 04:37:07 +01:00
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Flakes are still an experimental feature, but once they finally get merged
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2020-01-05 11:43:28 +01:00
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even more will become possible, i.e. [nixops](https://nixos.org/nixops)
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2020-01-04 04:23:13 +01:00
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support.
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2019-12-05 09:36:15 +01:00
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#### [Flake Talk][video]
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# Usage
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```sh
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# not needed if using direnv
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nix-shell
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git checkout -b $new_branch template
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# generate hardware config
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nixos-generate-config --show-hardware-config > ./hosts/${new_host}.nix
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2020-01-06 08:01:00 +01:00
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# ensure configuration lives in expected location
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ln -s $PWD /etc/nixos
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2020-01-07 00:57:35 +01:00
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# a flake is vcs based, so only git aware files are bundled
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# adding a new file to staging is enough
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git add ./hosts/${new_host}.nix
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2020-01-06 02:26:09 +01:00
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# `rebuild` wrapper for `nix build` bypassing `nixos-rebuild`
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# Usage: rebuild [host] {switch|boot|test|dry-activate}
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# You can specify any of the host configurations living in the ./hosts
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# directory. If omitted, it will default to your systems current hostname.
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# This will be run as root.
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rebuild $new_host switch
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```
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2020-01-04 01:47:17 +01:00
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And now you should be ready to start writing your nix configuration or import
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your current one. Review the [structure](#structure) below on how to build your
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layout. And be sure to update the [locale.nix](local/locale.nix) for your
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region.
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2020-01-06 02:57:04 +01:00
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You can always checkout my personal branch for more concrete examples.
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## Additional Capabilities
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```sh
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# make an iso image based on ./hosts/niximg.nix
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rebuild iso
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# install any package the flake exports
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nix profile install ".#packages.x86_64-linux.myPackage"
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```
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this flake exports multiple outputs for use in other flakes:
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```nix
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# external flake.nix
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{
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# ...
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inputs.nixflk.url = "github:nrdxp/nixflk";
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outputs = { self, nixpkgs, nixflk }: {
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nixosConfigurations.newConfig = nixflk.nixosConfigurations.someConfig;
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nixosConfigurations.myConfig = nixpkgs.lib.nixosSystem {
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system = "x86_64-linux";
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modules = [
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{ nixpkgs.overlays = nixflk.overlays; }
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nixflk.nixosModules.myModule
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];
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};
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};
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}
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2020-01-05 11:43:28 +01:00
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```
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2020-01-05 11:43:28 +01:00
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# Structure
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2020-01-05 11:43:28 +01:00
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The structure is here to keep things simple and clean. Anything sufficiently
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generic can ultimately be exported for use in other flakes without getting
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tied up in user concerns. As an added bonus, one can now trivially swap or
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combine [profiles](#profiles), creating a custom config in mere moments.
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## Hosts
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Distributions for particular machines should be stored in the [hosts](hosts)
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directory. Every file in this directory will be added automatically to the
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the `nixosConfigurations` flake output and thus becomes deployable. See the
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[`default.nix`](hosts/default.nix) for the implementation details.
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## Profiles
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A profile is any directory under [profiles](profiles) containing a `default.nix`
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defining a valid NixOS module, with the added restriction that no new
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delclarations to the `options` _or_ `config` attributes are allowed
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(use [modules](modules) instead). Their purpose is to provide abstract
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expressions suitable for reuse by multiple deployments. They are perhaps _the_
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key mechanism by which we keep this repo maintainable.
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Profiles can have subprofiles which are themselves just profiles that live under
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another. There's no hard rule that everything in the folder must be imported by
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its `default.nix`, so you can also store relevant code that is useful but not
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wanted by default in, say, an `alt.nix`. Importantly, every subdirectory in a
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profile should be independent of its parent.
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For example, a zsh directory lives under [profiles/develop](profiles/develop/zsh).
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It's self contained to allow inclusion without the whole of
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[develop](profiles/develop) if one so wished. This provides a wonderful level of
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granularity and control. Put simply: take the best, leave the rest.
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In addition, profiles can depend on other profiles. For instance, the
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[graphical](profiles/graphical) profile depends on [develop](profiles/develop)
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simply by importing it. This is to ensure my terminal configuration is always
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available from within a graphical session.
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Optionally, you may choose to export your profiles via the flake output. If
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you include it in the list defined in [profiles/default.nix](profiles/default.nix),
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it will be available to other flakes via `nixosModules.profiles`.
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2020-01-02 07:17:50 +01:00
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## Users
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2020-01-07 01:24:25 +01:00
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User declarations belong in the `users` directory, created on entering `nix-shell`.
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These are actually just a special case of [profiles](#profiles). Any profile that
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makes a declaration defining, or referencing a specific interactive user or uid
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belongs in here. That way profiles stay general, and all our idiosyncratic data
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has a clean home.
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For convenience, [home-manager][home-manager] is available automatically for
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home directory setup and should only be used from this directory.
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2020-01-06 06:41:19 +01:00
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## Lib
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The [lib](lib) directory contains a file `utils.nix` which is an attribute set
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meant to consist mainly of utility functions you might want to write and use
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throughout the configuration. They are available via a new `usr` attribute
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passed to every NixOS module, eg:
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```
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# hosts/some-host.nix
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{ usr, ... }:
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let data = usr.myFunction # ...
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in
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{
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# NixOS configuration
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}
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```
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2020-01-04 01:05:26 +01:00
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## Secrets
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Anything you wish to keep encrypted goes in the `secrets` directory, which is
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created on first entering a `nix-shell`.
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2020-01-04 01:54:27 +01:00
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Be sure to run `git crypt init`, before committing anything to this directory.
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Be sure to check out git-crypt's [documentation](https://github.com/AGWA/git-crypt)
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if your not familiar. The filter is already set up to encrypt everything in this
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folder by default.
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2020-01-04 01:05:26 +01:00
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2020-01-04 06:51:23 +01:00
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To keep [profiles](profiles) reusable across configurations, secrets should
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only be imported from the `users` or [`hosts`](hosts) directory.
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2020-01-06 08:01:00 +01:00
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## Modules, Packages and Overlays
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All expressions in both [modules/defualt.nix](modules/default.nix) and
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[pkgs/default.nix](pkgs/default.nix) are available globally, anywhere else in the
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repo. They are additionally included in the `nixosModules` and `overlay` flake
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outputs, respectively. Packages can manually be added to [flake.nix](flake.nix)
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for inclusion in the `packages` output as well.
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The directory structure is identical to nixpkgs to provide a kind of staging area
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for any modules or packages we might be wanting to merge there later. If your not
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familiar or can't be bothered, simply dropping a valid nix file and pointing the
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`default.nix` to it, is all that's really required.
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2020-01-02 07:17:50 +01:00
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2020-01-06 08:16:21 +01:00
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As for overlays, they should be defined in the [overlays](overlays) directory.
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They will be automatically pulled in for use by all configurations. Nix command
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line tools will be able to read overlays from here as well since it is set as
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`nixpkgs-overlays` in `NIX_PATH`. And of course they will be exported via the
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flake output `overlays` as well.
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2019-12-03 06:18:30 +01:00
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# License
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This software is licensed under the [MIT License](COPYING).
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Note: MIT license does not apply to the packages built by this configuration,
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merely to the files in this repository (the Nix expressions, build
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scripts, NixOS modules, etc.). It also might not apply to patches
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included here, which may be derivative works of the packages to
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which they apply. The aforementioned artifacts are all covered by the
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licenses of the respective packages.
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2020-01-02 07:17:50 +01:00
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[direnv]: https://direnv.net
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[home-manager]: https://github.com/rycee/home-manager
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[NixOS]: https://nixos.org
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[old]: https://github.com/nrdxp/nixos
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[pr]: https://github.com/NixOS/nixpkgs/pull/68897
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[rfc]: https://github.com/tweag/rfcs/blob/flakes/rfcs/0049-flakes.md
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[video]: https://www.youtube.com/watch?v=UeBX7Ide5a0
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