README.md: elaborate on project structure

Provide details for contribution and bootstrapping.
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# Introduction
This project is under construction as a rewrite of my [legacy][old]
NixOS configuration, using the [experimental][rfc] _flakes_ mechanism.
NixOS configuration, using the experimental [flakes][rfc] mechanism.
#### [Flake Talk][video]
# Usage
Enter a nix-shell either manually or automatically using [direnv][direnv]. This
will set up the exerimental nix features that need to be available to use
[flakes][pr]. A basic `rebuild` command is included in the shell to replace
`nixos-rebuild` for now.
## [setup][pr]:
```nix
{
nix.package = nixFlakes;
nix.extraOptions = ''
experimental-features = nix-command flakes
'';
}
```
Usage: rebuild [host] {switch|boot|test}
```
### sans [NixOS][nixos]:
```
# nix-env -f '<nixpkgs>' -iA nixFlakes
You can specify one of the host configurations from the [hosts](hosts)
directory. If omitted, it will default to your systems current hostname.
# echo "experimental-features = nix-command flakes" >> /etc/nix/nix.conf
In addtion:
```
rebuild iso
```
Will make a minimal and bootable iso image of the [niximg](hosts/niximg.nix)
configuration. You can customize the image by editing this file.
You can also install the packages declared in [pkgs](pkgs) without needing
to install NixOS. For example:
```
# from top-level
nix profile install ".#packages.x86_64-linux.purs"
```
# Contributing
The purpose of this repository is to allow for simpler modularity and
maintainability than was achieved in a previous effort. Flakes, along with a
standardized structure, make this simple.
## Hosts
Distributions for particular machines should be stored in the [hosts](hosts)
directory. Every file in this directory will be added automatically to the
available NixOS configurations available in the `nixosConfigurations` flake
output. See the [`default.nix`](hosts/default.nix) for implementation details.
## Profiles
More abstract configurations that can be reused by multiple machines should
go in the [profiles](profiles) directory. It's structure is pretty straight
forward. Just have a look to get an idea. Every profile should have a
`default.nix` to easily import it. You can also stick things in the profile's
subdirectory which are not automatically imported by its `default.nix` but are
meant to be manually imported from a host (useful for less common, or
specialized configurations).
In addition, profiles can depend on other profiles. For example, The
[graphical](profiles/graphical) profile depends on [develop](profiles/develop)
simply by importing it in its [`default.nix`](profiles/graphical/default.nix).
## Users
User declaration belongs in the [users](users) directory. Everything related to
your user should be declared here. For convenience, [home-manager][home-manager]
is available automatically for home directory setup.
## Modules and Packages
All [modules](modules/default.nix) and [pkgs](pkgs/default.nix) are available
for every configuration automatically. Simply add a `*.nix` file to one of
these directories declaring your module or package, and update the
corresponding `default.nix` to point to it. Now you can use your new module or
install your new package as usual.
Doing this will also add them to the flake's `nixosModules` or `overlays`
outputs to import them easily into an external NixOS configuration as well.
## Pull Requests
If you'd like to add a package, module, profile or host configuration please
be sure to format your code with [`nixpkgs-fmt`][nixpkgs-fmt] before
opening a pull-request. The commit message follows the same semantics as
[nixpkgs][nixpkgs]. You can use a `#` symbol to specify abiguities. For example,
`develop#zsh: <rest of commit message>` would tell me that your updating the
`zsh` configuration living under the `develop` profile.
# License
@ -43,8 +95,12 @@ included here, which may be derivative works of the packages to
which they apply. The aforementioned artifacts are all covered by the
licenses of the respective packages.
[rfc]: https://github.com/tweag/rfcs/blob/flakes/rfcs/0049-flakes.md
[pr]: https://github.com/NixOS/nixpkgs/pull/68897
[video]: https://www.youtube.com/watch?v=UeBX7Ide5a0
[direnv]: https://direnv.net
[home-manager]: https://github.com/nrdxp/home-manager
[NixOS]: https://nixos.org
[nixpkgs-fmt]: https://github.com/nix-community/nixpkgs-fmt
[nixpkgs]: https://github.com/NixOS/nixpkgs
[old]: https://github.com/nrdxp/nixos
[pr]: https://github.com/NixOS/nixpkgs/pull/68897
[rfc]: https://github.com/tweag/rfcs/blob/flakes/rfcs/0049-flakes.md
[video]: https://www.youtube.com/watch?v=UeBX7Ide5a0