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mirror of https://github.com/NixOS/mobile-nixos.git synced 2024-12-15 19:23:01 +03:00
mobile-nixos/modules/system-target.nix
2019-09-21 17:32:13 -04:00

66 lines
1.7 KiB
Nix

{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.mobile.system;
# Mapping from system types to config types
# A simplified view of <nixpkgs/lib/systems/examples.nix>
config_types = {
aarch64-linux = "aarch64-unknown-linux-gnu";
armv7l-linux = "armv7l-unknown-linux-gnueabihf";
x86_64-linux = "x86_64-unknown-linux-gnu";
};
# Derived from config_types
target_types = lib.attrNames config_types;
# Builds the expected "platform" set for cross-compilation from the given
# system name.
selectPlatform = system: {
inherit system;
platform = lib.systems.platforms.selectBySystem system;
config = config_types.${system};
};
# The platform selected by the configuration
selectedPlatform = selectPlatform cfg.system;
in
{
options.mobile = {
system.system = mkOption {
type = types.enum target_types;
description = ''
Defines the kind of target architecture system the device is.
This will automagically setup cross-compilation where possible.
'';
};
};
config = {
assertions = [
{
assertion = pkgs.targetPlatform.system == cfg.system;
message = "pkgs.targetPlatform.system expected to be `${cfg.system}`, is `${pkgs.targetPlatform.system}`";
}
];
nixpkgs.crossSystem = lib.mkIf
(
let
result = selectedPlatform.system != builtins.currentSystem;
in
builtins.trace
"Building with crossSystem?: ${selectedPlatform.system} != ${builtins.currentSystem} ${if result then "we are" else "we're not"}."
result
)
(
builtins.trace
" crossSystem: config: ${selectedPlatform.config}"
selectedPlatform
)
;
};
}