auto import hosts in flake.nix

this allows host-specific settings to be overriden with mkMerge
This commit is contained in:
Pacman99 2021-04-27 10:26:45 -07:00
parent df39cb692e
commit aa825b87a6
5 changed files with 48 additions and 32 deletions

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@ -1,18 +1,24 @@
# Hosts
Nix flakes contain an output called `nixosConfigurations` declaring an
attribute set of valid NixOS systems. To create hosts, you can use the
`nixos.hosts` argument and pass `modules` to each host. Host-specific modules
typically go in the `hosts` folder of the template.
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.
Each host should follow a certain channel to define the `pkgs` of that host.
You can use the `nixos.hostDefaults` to set defaults and global modules for all
hosts.
As an example, a file `hosts/system.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.
For each host, the configuration automatically sets the `networking.hostName`
attribute to the name of the host. This is for convenience, since `nixos-rebuild`
automatically searches for a configuration matching the current systems hostname
if one is not specified explicitly.
attribute to the 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.
It is recommended that the host modules only contain configuration information
specific to a particular piece of hardware. Anything reusable across machines
@ -21,16 +27,29 @@ is best saved for [profile modules](./profiles.md).
This is a good place to import sets of profiles, called [suites](./suites.md),
that you intend to use on your machine.
Additionally, you can pass modules from [nixos-hardware][nixos-hardware] in the
`modules` argument for relevant hosts.
## Example
flake.nix:
```nix
{
nixos.hosts = mkMerge [
(devos.lib.importHosts ./hosts)
{
librem = {
channelName = "latest";
modules = [ hardware.purism-librem-13v3 ];
};
}
];
}
```
hosts/librem.nix:
```nix
{ suites, hardware, ... }:
{ suites, ... }:
{
imports = suites.laptop ++ [ hardware.purism-librem-13v3 ];
imports = suites.laptop;
boot.loader.systemd-boot.enable = true;
boot.loader.efi.canTouchEfiVariables = true;
@ -39,15 +58,4 @@ hosts/librem.nix:
}
```
flake.nix
```nix
{
nixos.hosts.librem = {
system = "aarch64-linux";
modules = ./hosts/librem.nix;
};
}
```
[nixos-hardware]: https://github.com/NixOS/nixos-hardware

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@ -81,7 +81,7 @@
"utils": "utils_2"
},
"locked": {
"narHash": "sha256-r+OPJF65PToVQK1ll2INAYmIV3zmnDzWBpGLx8m4aVo=",
"narHash": "sha256-hpvEXcpq85cDKi0F5UUsuMVISKlk8hgVJiz5FF29RwA=",
"path": "./lib",
"type": "path"
},

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@ -61,11 +61,10 @@
home.nixosModules.home-manager
];
};
hosts = {
NixOS = {
modules = ./hosts/NixOS.nix;
};
};
hosts = nixos.lib.mkMerge [
(devos.lib.importHosts ./hosts)
{ /* set host specific properties here */ }
];
profiles = [ ./profiles ./users ];
suites = { profiles, users, ... }: with profiles; {
base = [ cachix core users.nixos users.root ];

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@ -30,6 +30,14 @@ rec {
value = import path;
});
importHosts = dir:
lib.os.recImport {
inherit dir;
_import = base: {
modules = import "${toString dir}/${base}.nix";
};
};
concatAttrs = lib.fold (attr: sum: lib.recursiveUpdate sum attr) { };
# Filter out packages that support given system and follow flake check requirements

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@ -48,7 +48,8 @@
safeReadDir
pathsToImportedAttrs
concatAttrs
filterPackages;
filterPackages
importHosts;
inherit (lists) pathsIn collectProfiles unifyOverlays;
inherit (strings) rgxToString;
inherit modules;
@ -60,7 +61,7 @@
{
lib = utils.lib // {
inherit (lib)
mkFlake pathsIn;
mkFlake pathsIn importHosts;
};
}