e24a8775a8
adds defaultText for all options that set their default to a path expression using the ubiquitous `cfg` shortcut bindings.
123 lines
4.0 KiB
Nix
123 lines
4.0 KiB
Nix
{ config, lib, options, pkgs, ... }:
|
||
|
||
with lib;
|
||
|
||
let
|
||
cfg = config.system.nixos;
|
||
opt = options.system.nixos;
|
||
in
|
||
|
||
{
|
||
imports = [
|
||
(mkRenamedOptionModule [ "system" "nixosVersion" ] [ "system" "nixos" "version" ])
|
||
(mkRenamedOptionModule [ "system" "nixosVersionSuffix" ] [ "system" "nixos" "versionSuffix" ])
|
||
(mkRenamedOptionModule [ "system" "nixosRevision" ] [ "system" "nixos" "revision" ])
|
||
(mkRenamedOptionModule [ "system" "nixosLabel" ] [ "system" "nixos" "label" ])
|
||
];
|
||
|
||
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.nullOr types.str;
|
||
default = trivial.revisionWithDefault null;
|
||
description = "The Git revision from which this NixOS configuration was built.";
|
||
};
|
||
|
||
nixos.codeName = mkOption {
|
||
readOnly = true;
|
||
type = types.str;
|
||
default = trivial.codeName;
|
||
description = "The NixOS release code name (e.g. <literal>Emu</literal>).";
|
||
};
|
||
|
||
stateVersion = mkOption {
|
||
type = types.str;
|
||
default = cfg.release;
|
||
defaultText = literalExpression "config.${opt.release}";
|
||
description = ''
|
||
Every once in a while, a new NixOS release may change
|
||
configuration defaults in a way incompatible with stateful
|
||
data. For instance, if the default version of PostgreSQL
|
||
changes, the new version will probably be unable to read your
|
||
existing databases. To prevent such breakage, you should set the
|
||
value of this option to the NixOS release with which you want
|
||
to be compatible. The effect is that NixOS will use
|
||
defaults corresponding to the specified release (such as using
|
||
an older version of PostgreSQL).
|
||
It‘s perfectly fine and recommended to leave this value at the
|
||
release version of the first install of this system.
|
||
Changing this option will not upgrade your system. In fact it
|
||
is meant to stay constant exactly when you upgrade your system.
|
||
You should only bump this option, if you are sure that you can
|
||
or have migrated all state on your system which is affected
|
||
by this option.
|
||
'';
|
||
};
|
||
|
||
defaultChannel = mkOption {
|
||
internal = true;
|
||
type = types.str;
|
||
default = "https://nixos.org/channels/nixos-unstable";
|
||
description = "Default NixOS channel to which the root user is subscribed.";
|
||
};
|
||
|
||
configurationRevision = mkOption {
|
||
type = types.nullOr types.str;
|
||
default = null;
|
||
description = "The Git revision of the top-level flake from which this configuration was built.";
|
||
};
|
||
|
||
};
|
||
|
||
config = {
|
||
|
||
system.nixos = {
|
||
# These defaults are set here rather than up there so that
|
||
# changing them would not rebuild the manual
|
||
version = mkDefault (cfg.release + cfg.versionSuffix);
|
||
};
|
||
|
||
# Generate /etc/os-release. See
|
||
# https://www.freedesktop.org/software/systemd/man/os-release.html for the
|
||
# format.
|
||
environment.etc.os-release.text =
|
||
''
|
||
NAME=NixOS
|
||
ID=nixos
|
||
VERSION="${cfg.release} (${cfg.codeName})"
|
||
VERSION_CODENAME=${toLower cfg.codeName}
|
||
VERSION_ID="${cfg.release}"
|
||
BUILD_ID="${cfg.version}"
|
||
PRETTY_NAME="NixOS ${cfg.release} (${cfg.codeName})"
|
||
LOGO="nix-snowflake"
|
||
HOME_URL="https://nixos.org/"
|
||
DOCUMENTATION_URL="https://nixos.org/learn.html"
|
||
SUPPORT_URL="https://nixos.org/community.html"
|
||
BUG_REPORT_URL="https://github.com/NixOS/nixpkgs/issues"
|
||
'';
|
||
|
||
};
|
||
|
||
}
|