nixpkgs/nixos/modules/misc/version.nix
Tuomas Tynkkynen 96190535e5 Revert "nixos: rename system.{stateVersion,defaultChannel} -> system.nixos.\1"
This reverts commit 095fe5b43d.

Pointless renames considered harmful. All they do is force people to
spend extra work updating their configs for no benefit, and hindering
the ability to switch between unstable and stable versions of NixOS.

Like, what was the value of having the "nixos." there? I mean, by
definition anything in a NixOS module has something to do with NixOS...
2018-07-28 00:12:55 +03:00

112 lines
3.5 KiB
Nix

{ options, config, lib, pkgs, ... }:
with lib;
let
cfg = config.system.nixos;
revisionFile = "${toString pkgs.path}/.git-revision";
gitRepo = "${toString pkgs.path}/.git";
gitCommitId = lib.substring 0 7 (commitIdFromGitRepo gitRepo);
in
{
options.system = {
nixos.version = mkOption {
internal = true;
type = types.str;
description = "The full NixOS version (e.g. <literal>16.03.1160.f2d4ee1</literal>).";
};
nixos.release = mkOption {
readOnly = true;
type = types.str;
default = trivial.release;
description = "The NixOS release (e.g. <literal>16.03</literal>).";
};
nixos.versionSuffix = mkOption {
internal = true;
type = types.str;
default = trivial.versionSuffix;
description = "The NixOS version suffix (e.g. <literal>1160.f2d4ee1</literal>).";
};
nixos.revision = mkOption {
internal = true;
type = types.str;
default = if pathIsDirectory gitRepo then commitIdFromGitRepo gitRepo
else if pathExists revisionFile then fileContents revisionFile
else "master";
description = "The Git revision from which this NixOS configuration was built.";
};
nixos.codeName = mkOption {
readOnly = true;
type = types.str;
description = "The NixOS release code name (e.g. <literal>Emu</literal>).";
};
stateVersion = mkOption {
type = types.str;
default = cfg.release;
description = ''
Every once in a while, a new NixOS release may change
configuration defaults in a way incompatible with stateful
data. For instance, if the default version of PostgreSQL
changes, the new version will probably be unable to read your
existing databases. To prevent such breakage, you can set the
value of this option to the NixOS release with which you want
to be compatible. The effect is that NixOS will option
defaults corresponding to the specified release (such as using
an older version of PostgreSQL).
'';
};
defaultChannel = mkOption {
internal = true;
type = types.str;
default = https://nixos.org/channels/nixos-unstable;
description = "Default NixOS channel to which the root user is subscribed.";
};
};
config = {
warnings = lib.optional (options.system.stateVersion.highestPrio > 1000)
"You don't have `system.stateVersion` explicitly set. Expect things to break.";
system.nixos = {
# These defaults are set here rather than up there so that
# changing them would not rebuild the manual
version = mkDefault (cfg.release + cfg.versionSuffix);
revision = mkIf (pathIsDirectory gitRepo) (mkDefault gitCommitId);
versionSuffix = mkIf (pathIsDirectory gitRepo) (mkDefault (".git." + gitCommitId));
# Note: the first letter is bumped on every release. It's an animal.
codeName = "Jellyfish";
};
# Generate /etc/os-release. See
# https://www.freedesktop.org/software/systemd/man/os-release.html for the
# format.
environment.etc."os-release".text =
''
NAME=NixOS
ID=nixos
VERSION="${cfg.version} (${cfg.codeName})"
VERSION_CODENAME=${toLower cfg.codeName}
VERSION_ID="${cfg.version}"
PRETTY_NAME="NixOS ${cfg.version} (${cfg.codeName})"
HOME_URL="https://nixos.org/"
SUPPORT_URL="https://nixos.org/nixos/support.html"
BUG_REPORT_URL="https://github.com/NixOS/nixpkgs/issues"
'';
};
}