os/doc/concepts/hosts.md

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# Hosts
Nix flakes contain an output called `nixosConfigurations` declaring an
attribute set of valid NixOS systems. To simplify the management and creation
of these hosts, devos automatically imports every _.nix_ file inside this
directory to the mentioned attribute set, applying the projects defaults to
each. The only hard requirement is that the file contain a valid NixOS module.
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As an example, a file `hosts/system.nix` or `hosts/system/default.nix` will
be available via the flake output `nixosConfigurations.system`. You can have
as many hosts as you want and all of them will be automatically imported based
on their name.
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For each host, the configuration automatically sets the `networking.hostName`
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attribute to the folder name or name of the file minus the _.nix_ extension. This
is for convenience, since `nixos-rebuild` automatically searches for a configuration
matching the current systems hostname if one is not specified explicitly.
You can set channels, systems, and add extra modules to each host by editing the
`nixos.hosts` argument in flake.nix. This is the perfect place to import
host specific modules from external sources, such as the
[nixos-hardware][nixos-hardware] repository.
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It is recommended that the host modules only contain configuration information
specific to a particular piece of hardware. Anything reusable across machines
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is best saved for [profile modules](./profiles.md).
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This is a good place to import sets of profiles, called [suites](./suites.md),
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that you intend to use on your machine.
## Example
flake.nix:
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```nix
{
nixos = {
imports = [ (devos.lib.importHosts ./hosts) ];
hosts = {
librem = {
channelName = "latest";
modules = [ nixos-hardware.nixosModules.purism-librem-13v3 ];
};
};
};
}
```
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hosts/librem.nix:
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```nix
{ suites, ... }:
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{
imports = suites.laptop;
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boot.loader.systemd-boot.enable = true;
boot.loader.efi.canTouchEfiVariables = true;
fileSystems."/" = { device = "/dev/disk/by-label/nixos"; };
}
```
[nixos-hardware]: https://github.com/NixOS/nixos-hardware