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linux-builder: make compatible with cross-arch builder package

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Before this commit, aarch64 users building the following configuration
would end up with an aarch64-linux builder, while after it, they get the
x86_64-linux builder they expect:
```nix
 nix.linux-builder = {
  enable = true;
  package = pkgs.darwin.linux-builder-x86_64;
};
```

Before, in order to get an x86_64-linux builder, they would have needed
to use this configuration instead:
```nix
 nix.linux-builder = {
  enable = true;
  config.nixpkgs.hostPlatform = "x86_64-linux";
  systems = ["x86_64-linux"];
};
```

The reason for this is that the linux-builder module calls `override` on
the package option, and the `linux-builder-x86_64` package is also
defined using override:
```nix
linux-builder-x86_64 = linux-builder.override {
  modules = [ { nixpkgs.hostPlatform = "x86_64-linux"; } ];
};
```

The module was effectively discarding the `nixpkgs.hostPlatform` option.

Example issue: https://github.com/NixOS/nixpkgs/issues/313784
This commit is contained in:
Nick Novitski 2024-06-12 18:41:49 -07:00
parent 315aa649ba
commit d21ba5a487
1 changed files with 9 additions and 5 deletions
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14
modules/nix/linux-builder.nix
View file

@ -7,9 +7,11 @@ let
cfg = config.nix.linux-builder;
builderWithOverrides = cfg.package.override {
modules = [ cfg.config ];
};
builderWithOverrides = cfg.package.override (previousArguments: {
# the linux-builder packages require a list `modules` argument, so it's
# always non-null.
modules = previousArguments.modules ++ [ cfg.config ];
});
# create-builder uses TMPDIR to share files with the builder, notably certs.
# macOS will clean up files in /tmp automatically that haven't been accessed in 3+ days.
@ -133,8 +135,10 @@ in
systems = mkOption {
type = types.listOf types.str;
default = [ "${stdenv.hostPlatform.uname.processor}-linux" ];
defaultText = literalExpression ''[ "''${stdenv.hostPlatform.uname.processor}-linux" ]'';
default = [ builderWithOverrides.nixosConfig.nixpkgs.hostPlatform.system ];
defaultText = ''
The `nixpkgs.hostPlatform.system` of the build machine's final NixOS configuration.
'';
example = literalExpression ''
[
"x86_64-linux"