forked from mirrors/nixpkgs
96 lines
2.7 KiB
Nix
96 lines
2.7 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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{
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options = {
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system.stateVersion = mkOption {
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type = types.str;
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default = config.system.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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system.nixosVersion = mkOption {
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internal = true;
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type = types.str;
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description = "NixOS version.";
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};
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system.nixosRelease = mkOption {
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readOnly = true;
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type = types.str;
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default = readFile "${toString pkgs.path}/.version";
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description = "NixOS release.";
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};
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system.nixosVersionSuffix = mkOption {
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internal = true;
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type = types.str;
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description = "NixOS version suffix.";
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};
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system.nixosRevision = mkOption {
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internal = true;
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type = types.str;
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description = "NixOS Git revision hash.";
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};
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system.nixosCodeName = mkOption {
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readOnly = true;
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type = types.str;
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description = "NixOS release code name.";
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};
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system.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.nixosVersion = mkDefault (config.system.nixosRelease + config.system.nixosVersionSuffix);
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system.nixosVersionSuffix =
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let suffixFile = "${toString pkgs.path}/.version-suffix"; in
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mkDefault (if pathExists suffixFile then readFile suffixFile else "pre-git");
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system.nixosRevision =
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let fn = "${toString pkgs.path}/.git-revision"; in
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mkDefault (if pathExists fn then readFile fn else "master");
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# Note: code names must only increase in alphabetical order.
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system.nixosCodeName = "Dingo";
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# Generate /etc/os-release. See
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# http://0pointer.de/public/systemd-man/os-release.html for the
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# format.
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environment.etc."os-release".text =
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''
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NAME=NixOS
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ID=nixos
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VERSION="${config.system.nixosVersion} (${config.system.nixosCodeName})"
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VERSION_ID="${config.system.nixosVersion}"
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PRETTY_NAME="NixOS ${config.system.nixosVersion} (${config.system.nixosCodeName})"
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HOME_URL="http://nixos.org/"
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'';
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};
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}
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