137 lines
4.7 KiB
Nix
137 lines
4.7 KiB
Nix
{ config, lib, options, pkgs, ... }:
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let
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cfg = config.system.nixos;
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opt = options.system.nixos;
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inherit (lib)
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concatStringsSep mapAttrsToList toLower
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literalExpression mkRenamedOptionModule mkDefault mkOption trivial types;
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attrsToText = attrs:
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concatStringsSep "\n" (mapAttrsToList (n: v: ''${n}="${toString v}"'') attrs);
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in
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{
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imports = [
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(mkRenamedOptionModule [ "system" "nixosVersion" ] [ "system" "nixos" "version" ])
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(mkRenamedOptionModule [ "system" "nixosVersionSuffix" ] [ "system" "nixos" "versionSuffix" ])
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(mkRenamedOptionModule [ "system" "nixosRevision" ] [ "system" "nixos" "revision" ])
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(mkRenamedOptionModule [ "system" "nixosLabel" ] [ "system" "nixos" "label" ])
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];
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options.system = {
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nixos.version = mkOption {
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internal = true;
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type = types.str;
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description = "The full NixOS version (e.g. <literal>16.03.1160.f2d4ee1</literal>).";
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};
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nixos.release = mkOption {
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readOnly = true;
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type = types.str;
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default = trivial.release;
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description = "The NixOS release (e.g. <literal>16.03</literal>).";
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};
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nixos.versionSuffix = mkOption {
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internal = true;
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type = types.str;
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default = trivial.versionSuffix;
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description = "The NixOS version suffix (e.g. <literal>1160.f2d4ee1</literal>).";
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};
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nixos.revision = mkOption {
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internal = true;
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type = types.nullOr types.str;
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default = trivial.revisionWithDefault null;
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description = "The Git revision from which this NixOS configuration was built.";
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};
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nixos.codeName = mkOption {
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readOnly = true;
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type = types.str;
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default = trivial.codeName;
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description = "The NixOS release code name (e.g. <literal>Emu</literal>).";
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};
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stateVersion = mkOption {
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type = types.str;
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default = cfg.release;
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defaultText = literalExpression "config.${opt.release}";
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description = ''
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Every once in a while, a new NixOS release may change
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configuration defaults in a way incompatible with stateful
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data. For instance, if the default version of PostgreSQL
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changes, the new version will probably be unable to read your
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existing databases. To prevent such breakage, you should set the
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value of this option to the NixOS release with which you want
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to be compatible. The effect is that NixOS will use
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defaults corresponding to the specified release (such as using
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an older version of PostgreSQL).
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It‘s perfectly fine and recommended to leave this value at the
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release version of the first install of this system.
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Changing this option will not upgrade your system. In fact it
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is meant to stay constant exactly when you upgrade your system.
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You should only bump this option, if you are sure that you can
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or have migrated all state on your system which is affected
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by this option.
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'';
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};
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defaultChannel = mkOption {
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internal = true;
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type = types.str;
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default = "https://nixos.org/channels/nixos-unstable";
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description = "Default NixOS channel to which the root user is subscribed.";
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};
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configurationRevision = mkOption {
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type = types.nullOr types.str;
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default = null;
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description = "The Git revision of the top-level flake from which this configuration was built.";
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};
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};
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config = {
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system.nixos = {
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# These defaults are set here rather than up there so that
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# changing them would not rebuild the manual
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version = mkDefault (cfg.release + cfg.versionSuffix);
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};
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# Generate /etc/os-release. See
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# https://www.freedesktop.org/software/systemd/man/os-release.html for the
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# format.
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environment.etc = {
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"lsb-release".text = attrsToText {
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LSB_VERSION = "${cfg.release} (${cfg.codeName})";
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DISTRIB_ID = "nixos";
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DISTRIB_RELEASE = cfg.release;
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DISTRIB_CODENAME = toLower cfg.codeName;
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DISTRIB_DESCRIPTION = "NixOS ${cfg.release} (${cfg.codeName})";
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};
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"os-release".text = attrsToText {
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NAME = "NixOS";
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ID = "nixos";
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VERSION = "${cfg.release} (${cfg.codeName})";
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VERSION_CODENAME = toLower cfg.codeName;
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VERSION_ID = cfg.release;
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BUILD_ID = cfg.version;
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PRETTY_NAME = "NixOS ${cfg.release} (${cfg.codeName})";
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LOGO = "nix-snowflake";
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HOME_URL = "https://nixos.org/";
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DOCUMENTATION_URL = "https://nixos.org/learn.html";
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SUPPORT_URL = "https://nixos.org/community.html";
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BUG_REPORT_URL = "https://github.com/NixOS/nixpkgs/issues";
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};
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};
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};
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# uses version info nixpkgs, which requires a full nixpkgs path
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meta.buildDocsInSandbox = false;
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}
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