mirror of
https://github.com/NixOS/mobile-nixos.git
synced 2024-12-15 02:43:24 +03:00
97 lines
3.1 KiB
Nix
97 lines
3.1 KiB
Nix
let
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# Selection of the device can be made either through the environment or through
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# using `--argstr device [...]`.
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deviceFromEnv = builtins.getEnv "MOBILE_NIXOS_DEVICE";
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# Selection of the configuration can by made either through NIX_PATH,
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# through local.nixx or as a parameter.
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default_configuration =
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let
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configPathFromNixPath = (builtins.tryEval <mobile-nixos-configuration>).value;
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in
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if configPathFromNixPath != false then [ configPathFromNixPath ]
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else if (builtins.pathExists ./local.nix) then [ (import ./local.nix) ]
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else []
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;
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# "a" nixpkgs we're using for its lib.
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pkgs' = import <nixpkgs> {};
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in
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{
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# The identifier of the device this should be built for.
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# (This gets massaged later on)
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# This allows using `default.nix` as a pass-through function.
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# See usage in examples folder.
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device ? null
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, configuration ? default_configuration
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}:
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let
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inherit (pkgs'.lib) optional;
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# Either use:
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# The given `device`.
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# The environment variable.
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final_device = if device != null then device
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else if deviceFromEnv == "" then
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throw "Please pass a device name or set the MOBILE_NIXOS_DEVICE environment variable."
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else deviceFromEnv
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;
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# Evaluates NixOS, mobile-nixos and the device config with the given
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# additional modules.
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evalWith = modules: import ./lib/eval-config.nix {
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modules = [
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(import (./. + "/devices/${final_device}" ))
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] ++ modules;
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};
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# The "default" eval.
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eval = evalWith configuration;
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# This is used by the `-A installer` shortcut.
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installer-eval = evalWith [
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./profiles/installer.nix
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];
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in
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{
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# The build artifacts from the modules system.
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inherit (eval.config.system) build;
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# The evaluated config
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inherit (eval) config;
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# The final pkgs set, usable as -A pkgs.[...] on the CLI.
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inherit (eval) pkgs;
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# The whole (default) eval
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inherit eval;
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# Shortcut to allow building `nixos` from the same channel revision.
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# This is used by `./nixos/default.nix`
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# Any time `nix-build nixos` is used upstream, it can be used here.
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nixos = import <nixpkgs/nixos>;
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# `mobile-installer` will, when possible, contain the installer build for the
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# given system. It usually is an alias for a disk-image type build.
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installer = installer-eval.config.system.build.mobile-installer;
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# Evaluating this whole set is counter-productive.
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# It'll put a *bunch* of build products from the misc. inherits we added.
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# (We're also using `device` to force the other throw to happen first.)
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# TODO : We may want to produce an internal list of available outputs, so that
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# each platform can document what it makes available. This would allow
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# the message to be more user-friendly by displaying a choice.
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__please-fail = throw ''
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Cannot directly build for ${final_device}...
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Building this whole set is counter-productive, and not likely to be what
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is desired.
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You can try to build the `installer` attribute (-A installer) if your system
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provides an installer.
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Please refer to your platform's documentation for usage.
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'';
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}
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