README.md: be more concise
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Timothy DeHerrera
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README.md
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README.md
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# Introduction
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This project is under construction as a rewrite of my [legacy][old]
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NixOS configuration using the experimental [flakes][rfc] mechanism. Its aim is
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to provide a generic template repository which neatly separates concerns and
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allows one to get up and running with NixOS faster than ever.
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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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Flakes are still an experimental feature, but once they finally get merged
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even more will become possible, including [nixops](https://nixos.org/nixops)
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even more will become possible, i.e. [nixops](https://nixos.org/nixops)
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support.
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#### [Flake Talk][video]
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# Usage
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Enter a nix-shell either manually or automatically using [direnv][direnv]. This
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will set up the experimental nix features that need to be available to use
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[flakes][pr].
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```sh
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# not needed if using direnv
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nix-shell
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Start a new branch based on the template branch:
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```
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git checkout -b <new_branch> template
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```
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git checkout -b $new_branch template
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You may want to use a generated hardware config for your machine:
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```
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nixos-generate-config --show-hardware-config > ./hosts/<new_host>.nix
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```
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# generate hardware config
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nixos-generate-config --show-hardware-config > ./hosts/${new_host}.nix
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A basic `rebuild` command is included in the shell to replace
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`nixos-rebuild` for now:
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# wrapper for `nix build` bypassing `nixos-rebuild`
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# Usage: rebuild [([host] {switch|boot|test|dry-activate})|iso]
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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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rebuild $new_host switch
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```
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Usage: rebuild [host] {switch|boot|test}
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#example using above generated config
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rebuild <new_host> switch
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```
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You can specify one of the host configurations from the [hosts](hosts)
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directory. If omitted, it will default to your systems current hostname.
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And now you should be ready to start writing your nix configuration or import
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some of the already existing profiles. Review [contributing](#contributing)
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below on how to structure your expressions. And be sure to update the
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[locale.nix](local/locale.nix) for your region.
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your current one. Review [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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You can always check out my personal branch
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[`nrdxp`](https://github.com/nrdxp/nixflk/tree/nrdxp), for concrete examples.
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You can always checkout my personal branch
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[`nrdxp`](https://github.com/nrdxp/nixflk/tree/nrdxp) for more concrete examples.
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## Additional Capabilities
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Making iso images:
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```
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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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Will make a minimal and bootable iso image of the [niximg](hosts/niximg.nix)
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configuration. You can customize the image by editing this file.
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this flake exports overlays and modules as well:
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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.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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You can also install the packages declared in [pkgs](pkgs) without needing
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to install NixOS. For example:
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```
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# from top-level
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nix profile install ".#packages.x86_64-linux.purs"
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```
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A similar mechanism exists to import the modules and overlays declared in the
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flake to allow for seamless sharing between configurations.
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# Structure
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# Structure and Layout
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The purpose of this repository is to provide a standardized template structure
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for NixOS machine expressions, thus enabling simpler sharing and reuse of nix
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expressions.
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Say your friend and you are using this repository, each with your own unique
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nix expressions. By simply importing your friends flake from `flake.nix` as an
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input, you can have access to all of the packages, modules, overlays, and even
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entire system configurations your friend has defined!
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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. An additional bonus of is the ability to trivially
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swap or combine [profiles](#profiles).
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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. See the
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the `nixosConfigurations` flake output and thus 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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More abstract configurations suitable for reuse by multiple machines should
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go in the [profiles](profiles) directory. A distinction is made between a module
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and profile, in that a profile is simply a regular NixOS module, without any new
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option declarations. If you want to declare new
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[options](https://nixos.org/nixos/manual/options.html), create an expression
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under the [modules](modules) directory instead.
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More abstract expressions suitable for reuse by deployments should live in the
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[profiles](profiles) directory. A distinction is made between a module and
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profile, in that a profile is simply a regular NixOS module, without any _new_
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option declarations.
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Every profile should have a `default.nix` to easily import it. You can also
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stick things in the profile's subdirectory which are not automatically
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imported, but are meant to be manually imported from a host (useful for less
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common, or specialized configurations).
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Every directory here is a profile and should have a `default.nix` to import it.
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Profiles can have subprofiles which are just subdirectories with a `default.nix`.
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There's no hard rule that everything in the folder must be imported by its
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`default.nix` so you can also store relevant configurations that may not be used
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as often and just import them directly from a [host](#hosts) when needed.
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Importantly, every subdirectory in a profile should be independently importable.
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For example, a zsh directory lives under [profiles/develop](profiles/develop/zsh).
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