119 lines
3.8 KiB
Nix
119 lines
3.8 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.system;
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releaseFile = "${toString pkgs.path}/.version";
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suffixFile = "${toString pkgs.path}/.version-suffix";
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revisionFile = "${toString pkgs.path}/.git-revision";
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gitRepo = "${toString pkgs.path}/.git";
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gitCommitId = lib.substring 0 7 (commitIdFromGitRepo gitRepo);
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in
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{
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options.system = {
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stateVersion = mkOption {
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type = types.str;
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default = cfg.nixosRelease;
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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 can 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 option
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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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'';
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};
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nixosLabel = mkOption {
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type = types.str;
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description = ''
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Label to be used in the names of generated outputs and boot
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labels.
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'';
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};
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nixosVersion = 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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nixosRelease = mkOption {
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readOnly = true;
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type = types.str;
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default = fileContents releaseFile;
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description = "The NixOS release (e.g. <literal>16.03</literal>).";
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};
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nixosVersionSuffix = mkOption {
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internal = true;
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type = types.str;
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default = if pathExists suffixFile then fileContents suffixFile else "pre-git";
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description = "The NixOS version suffix (e.g. <literal>1160.f2d4ee1</literal>).";
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};
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nixosRevision = mkOption {
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internal = true;
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type = types.str;
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default = if pathIsDirectory gitRepo then commitIdFromGitRepo gitRepo
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else if pathExists revisionFile then fileContents revisionFile
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else "master";
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description = "The Git revision from which this NixOS configuration was built.";
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};
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nixosCodeName = mkOption {
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readOnly = true;
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type = types.str;
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description = "The NixOS release code name (e.g. <literal>Emu</literal>).";
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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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};
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config = {
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system = {
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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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nixosLabel = mkDefault cfg.nixosVersion;
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nixosVersion = mkDefault (cfg.nixosRelease + cfg.nixosVersionSuffix);
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nixosRevision = mkIf (pathIsDirectory gitRepo) (mkDefault gitCommitId);
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nixosVersionSuffix = mkIf (pathIsDirectory gitRepo) (mkDefault (".git." + gitCommitId));
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# Note: code names must only increase in alphabetical order.
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nixosCodeName = "Hummingbird";
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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."os-release".text =
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''
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NAME=NixOS
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ID=nixos
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VERSION="${config.system.nixosVersion} (${config.system.nixosCodeName})"
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VERSION_CODENAME=${toLower config.system.nixosCodeName}
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VERSION_ID="${config.system.nixosVersion}"
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PRETTY_NAME="NixOS ${config.system.nixosVersion} (${config.system.nixosCodeName})"
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HOME_URL="https://nixos.org/"
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SUPPORT_URL="https://nixos.org/nixos/support.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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