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support externally extensible systems

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With this change, it becomes possible to modify the list of systems that
a flake is using, using only the flake override mechanisms.

See <https://github.com/numtide/treefmt/pull/228> and
<https://github.com/nix-systems/nix-systems>.
This commit is contained in:
zimbatm 2023-04-09 12:20:25 +02:00
parent dcc36e45d0
commit e89753d0c9
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GPG key ID: 71BAF6D40C1D63D7
2 changed files with 11 additions and 3 deletions
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11
modules/perSystem.nix
View file

@ -59,14 +59,21 @@ let
in
{
options = {
systems = mkOption {
systems = mkOption ({
description = ''
All the system types to enumerate in the flake output subattributes.
In other words, all valid values for `system` in e.g. `packages.<system>.foo`.
If the `systems` flake input exists, it will be imported as the
default. See <https://github.com/nix-systems/nix-systems> for a
description of the pattern.
'';
type = types.listOf types.str;
};
} // (lib.optionalAttrs self.inputs?systems) {
# Load the systems input by default if it has been declared.
default = import self.inputs.systems;
});
perInput = mkOption {
description = ''

3
template/default/flake.nix
View file

@ -3,6 +3,8 @@
inputs = {
nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
# The list of systems to use
systems.url = "github:nix-systems/default";
};
outputs = inputs@{ flake-parts, ... }:
@ -14,7 +16,6 @@
# 3. Add here: foo.flakeModule
];
systems = [ "x86_64-linux" "aarch64-darwin" ];
perSystem = { config, self', inputs', pkgs, system, ... }: {
# Per-system attributes can be defined here. The self' and inputs'
# module parameters provide easy access to attributes of the same