tgirl.cloud
a flake module to ease creating and managing multiple hosts in your nix flake.
fix: correct importing module args for some nixpkgs modules
isabelroses.com
+40
-22
lib.nix
+40
-22
lib.nix
···
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else
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throw "cannot find nix-darwin input";
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# create the modulesPath based on the system, we need
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modulesPath =
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if class == "darwin" then "${darwinInput}/modules" else "${inputs.nixpkgs}/nixos/modules";
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+
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# we need to import the module list for our system
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# this is either the nixos modules list provided by nixpkgs
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# or the darwin modules list provided by nix darwin
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baseModules = import "${modulesPath}/module-list.nix";
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eval = evalModules {
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# we use recursiveUpdate such that users can "override" the specialArgs
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#
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# This should only be used for special arguments that need to be evaluated
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# when resolving module structure (like in imports).
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specialArgs = recursiveUpdate {
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# create the modulesPath based on the system, we need
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modulesPath =
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if class == "darwin" then "${darwinInput}/modules" else "${inputs.nixpkgs}/nixos/modules";
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inherit
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# these are normal args that people expect to be passed
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lib
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self # even though self is just the same as `inputs.self`
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inputs
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# these come from flake-parts
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self'
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inputs'
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# laying it out this way is completely arbitrary, however it looks nice i guess
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inherit lib;
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inherit self self';
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inherit inputs inputs';
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# we need to set this beacuse some modules require it sadly
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# you may also recall `modulesPath + /installer/scan/not-detected.nix`
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modulesPath
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;
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} specialArgs;
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# A nominal type for modules. When set and non-null, this adds a check to
···
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class = classToND class;
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modules = flatten [
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# bring in all of our base modules
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baseModules
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+
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# import our host system paths
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(
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if path != null then
···
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"${inputs.nixpkgs}/nixos/modules/installer/cd-dvd/installation-cd-minimal-new-kernel.nix"
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])
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# we need to import the module list for our system
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# this is either the nixos modules list provided by nixpkgs
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# or the darwin modules list provided by nix darwin
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(import (
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if class == "darwin" then
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"${darwinInput}/modules/module-list.nix"
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else
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"${inputs.nixpkgs}/nixos/modules/module-list.nix"
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))
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(singleton {
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# TODO: learn what this means and why its needed to build the iso
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_module.args.modules = [ ];
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# some modules to have these arguments, like documentation.nix
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# <https://github.com/NixOS/nixpkgs/blob/9692553cb583e8dca46b66ab76c0eb2ada1a4098/nixos/modules/misc/documentation.nix>
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_module.args = {
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inherit baseModules;
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# this should in the future be the modules that the user added without baseModules
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modules = [ ];
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# TODO: remove in 25.05
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# https://github.com/NixOS/nixpkgs/blob/9692553cb583e8dca46b66ab76c0eb2ada1a4098/nixos/lib/eval-config.nix#L38
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extraModules = [ ];
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};
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# we set the systems hostname based on the host value
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# which should be a string that is the hostname of the system
···
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)
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);
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onlyDirs = filterAttrs (_: type: type == "directory");
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-
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normaliseHosts =
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cfg: hosts:
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if (cfg.onlySystem == null) then
···
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if (cfg.onlySystem != null) then
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hostsDir
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else
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mapAttrs (path: _: readDir "${cfg.path}/${path}") (onlyDirs hostsDir);
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mapAttrs (path: _: readDir "${cfg.path}/${path}") (
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filterAttrs (_: type: type == "directory") hostsDir
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);
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in
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normaliseHosts cfg hosts;
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in