124 lines
4.5 KiB
Nix
124 lines
4.5 KiB
Nix
# Note that these schemas are defined by RFC-0125.
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# This document is considered a stable API, and is depended upon by external tooling.
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# Changes to the structure of the document, or the semantics of the values should go through an RFC.
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#
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# See: https://github.com/NixOS/rfcs/pull/125
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{ config
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, pkgs
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, lib
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, ...
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}:
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let
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cfg = config.boot.bootspec;
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children = lib.mapAttrs (childName: childConfig: childConfig.configuration.system.build.toplevel) config.specialisation;
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schemas = {
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v1 = rec {
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filename = "boot.json";
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json =
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pkgs.writeText filename
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(builtins.toJSON
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{
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v1 = {
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kernel = "${config.boot.kernelPackages.kernel}/${config.system.boot.loader.kernelFile}";
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kernelParams = config.boot.kernelParams;
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initrd = "${config.system.build.initialRamdisk}/${config.system.boot.loader.initrdFile}";
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initrdSecrets = "${config.system.build.initialRamdiskSecretAppender}/bin/append-initrd-secrets";
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label = "NixOS ${config.system.nixos.codeName} ${config.system.nixos.label} (Linux ${config.boot.kernelPackages.kernel.modDirVersion})";
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inherit (cfg) extensions;
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};
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});
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generator =
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let
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# NOTE: Be careful to not introduce excess newlines at the end of the
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# injectors, as that may affect the pipes and redirects.
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# Inject toplevel and init into the bootspec.
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# This can only be done here because we *cannot* depend on $out
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# referring to the toplevel, except by living in the toplevel itself.
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toplevelInjector = lib.escapeShellArgs [
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"${pkgs.jq}/bin/jq"
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''
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.v1.toplevel = $toplevel |
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.v1.init = $init
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''
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"--sort-keys"
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"--arg" "toplevel" "${placeholder "out"}"
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"--arg" "init" "${placeholder "out"}/init"
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] + " < ${json}";
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# We slurp all specialisations and inject them as values, such that
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# `.specialisations.${name}` embeds the specialisation's bootspec
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# document.
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specialisationInjector =
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let
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specialisationLoader = (lib.mapAttrsToList
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(childName: childToplevel: lib.escapeShellArgs [ "--slurpfile" childName "${childToplevel}/bootspec/${filename}" ])
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children);
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in
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lib.escapeShellArgs [
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"${pkgs.jq}/bin/jq"
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"--sort-keys"
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".v1.specialisation = ($ARGS.named | map_values(. | first | .v1))"
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] + " ${lib.concatStringsSep " " specialisationLoader}";
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in
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''
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mkdir -p $out/bootspec
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${toplevelInjector} | ${specialisationInjector} > $out/bootspec/${filename}
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'';
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validator = pkgs.writeCueValidator ./bootspec.cue {
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document = "Document"; # Universal validator for any version as long the schema is correctly set.
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};
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};
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};
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in
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{
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options.boot.bootspec = {
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enable = lib.mkEnableOption (lib.mdDoc "Enable generation of RFC-0125 bootspec in $system/bootspec, e.g. /run/current-system/bootspec");
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extensions = lib.mkOption {
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type = lib.types.attrs;
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default = { };
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description = lib.mdDoc ''
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User-defined data that extends the bootspec document.
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To reduce incompatibility and prevent names from clashing
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between applications, it is **highly recommended** to use a
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unique namespace for your extensions.
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'';
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};
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# This will be run as a part of the `systemBuilder` in ./top-level.nix. This
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# means `$out` points to the output of `config.system.build.toplevel` and can
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# be used for a variety of things (though, for now, it's only used to report
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# the path of the `toplevel` itself and the `init` executable).
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writer = lib.mkOption {
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internal = true;
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default = schemas.v1.generator;
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};
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validator = lib.mkOption {
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internal = true;
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default = schemas.v1.validator;
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};
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filename = lib.mkOption {
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internal = true;
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default = schemas.v1.filename;
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};
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};
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config = lib.mkIf (cfg.enable) {
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warnings = [
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''RFC-0125 is not merged yet, this is a feature preview of bootspec.
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The schema is not definitive and features are not guaranteed to be stable until RFC-0125 is merged.
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See:
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- https://github.com/NixOS/nixpkgs/pull/172237 to track merge status in nixpkgs.
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- https://github.com/NixOS/rfcs/pull/125 to track RFC status.
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''
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];
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};
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}
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