nixpkgs/nixos/modules/misc/version.nix
Lily Foster b5cc73db7d
nixos/version: remove nixpkgs commit rev from initrd
This avoids unnecessary initrd rebuilds when nothing in the initrd would
have changed aside from the nixpkgs revision.
2023-06-14 16:57:34 -04:00

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{ config, lib, options, pkgs, ... }:
let
cfg = config.system.nixos;
opt = options.system.nixos;
inherit (lib)
concatStringsSep mapAttrsToList toLower
literalExpression mkRenamedOptionModule mkDefault mkOption trivial types;
needsEscaping = s: null != builtins.match "[a-zA-Z0-9]+" s;
escapeIfNecessary = s: if needsEscaping s then s else ''"${lib.escape [ "\$" "\"" "\\" "\`" ] s}"'';
attrsToText = attrs:
concatStringsSep "\n" (
mapAttrsToList (n: v: ''${n}=${escapeIfNecessary (toString v)}'') attrs
) + "\n";
osReleaseContents = {
NAME = "${cfg.distroName}";
ID = "${cfg.distroId}";
VERSION = "${cfg.release} (${cfg.codeName})";
VERSION_CODENAME = toLower cfg.codeName;
VERSION_ID = cfg.release;
BUILD_ID = cfg.version;
PRETTY_NAME = "${cfg.distroName} ${cfg.release} (${cfg.codeName})";
LOGO = "nix-snowflake";
HOME_URL = lib.optionalString (cfg.distroId == "nixos") "https://nixos.org/";
DOCUMENTATION_URL = lib.optionalString (cfg.distroId == "nixos") "https://nixos.org/learn.html";
SUPPORT_URL = lib.optionalString (cfg.distroId == "nixos") "https://nixos.org/community.html";
BUG_REPORT_URL = lib.optionalString (cfg.distroId == "nixos") "https://github.com/NixOS/nixpkgs/issues";
} // lib.optionalAttrs (cfg.variant_id != null) {
VARIANT_ID = cfg.variant_id;
};
initrdReleaseContents = (removeAttrs osReleaseContents [ "BUILD_ID" ]) // {
PRETTY_NAME = "${osReleaseContents.PRETTY_NAME} (Initrd)";
};
initrdRelease = pkgs.writeText "initrd-release" (attrsToText initrdReleaseContents);
in
{
imports = [
./label.nix
(mkRenamedOptionModule [ "system" "nixosVersion" ] [ "system" "nixos" "version" ])
(mkRenamedOptionModule [ "system" "nixosVersionSuffix" ] [ "system" "nixos" "versionSuffix" ])
(mkRenamedOptionModule [ "system" "nixosRevision" ] [ "system" "nixos" "revision" ])
(mkRenamedOptionModule [ "system" "nixosLabel" ] [ "system" "nixos" "label" ])
];
options.boot.initrd.osRelease = mkOption {
internal = true;
readOnly = true;
default = initrdRelease;
};
options.system = {
nixos.version = mkOption {
internal = true;
type = types.str;
description = lib.mdDoc "The full NixOS version (e.g. `16.03.1160.f2d4ee1`).";
};
nixos.release = mkOption {
readOnly = true;
type = types.str;
default = trivial.release;
description = lib.mdDoc "The NixOS release (e.g. `16.03`).";
};
nixos.versionSuffix = mkOption {
internal = true;
type = types.str;
default = trivial.versionSuffix;
description = lib.mdDoc "The NixOS version suffix (e.g. `1160.f2d4ee1`).";
};
nixos.revision = mkOption {
internal = true;
type = types.nullOr types.str;
default = trivial.revisionWithDefault null;
description = lib.mdDoc "The Git revision from which this NixOS configuration was built.";
};
nixos.codeName = mkOption {
readOnly = true;
type = types.str;
default = trivial.codeName;
description = lib.mdDoc "The NixOS release code name (e.g. `Emu`).";
};
nixos.distroId = mkOption {
internal = true;
type = types.str;
default = "nixos";
description = lib.mdDoc "The id of the operating system";
};
nixos.distroName = mkOption {
internal = true;
type = types.str;
default = "NixOS";
description = lib.mdDoc "The name of the operating system";
};
nixos.variant_id = mkOption {
type = types.nullOr (types.strMatching "^[a-z0-9._-]+$");
default = null;
description = lib.mdDoc "A lower-case string identifying a specific variant or edition of the operating system";
example = "installer";
};
stateVersion = mkOption {
type = types.str;
# TODO Remove this and drop the default of the option so people are forced to set it.
# Doing this also means fixing the comment in nixos/modules/testing/test-instrumentation.nix
apply = v:
lib.warnIf (options.system.stateVersion.highestPrio == (lib.mkOptionDefault { }).priority)
"system.stateVersion is not set, defaulting to ${v}. Read why this matters on https://nixos.org/manual/nixos/stable/options.html#opt-system.stateVersion."
v;
default = cfg.release;
defaultText = literalExpression "config.${opt.release}";
description = lib.mdDoc ''
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).
Its 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 = lib.mdDoc "Default NixOS channel to which the root user is subscribed.";
};
configurationRevision = mkOption {
type = types.nullOr types.str;
default = null;
description = lib.mdDoc "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 = {
"lsb-release".text = attrsToText {
LSB_VERSION = "${cfg.release} (${cfg.codeName})";
DISTRIB_ID = "${cfg.distroId}";
DISTRIB_RELEASE = cfg.release;
DISTRIB_CODENAME = toLower cfg.codeName;
DISTRIB_DESCRIPTION = "${cfg.distroName} ${cfg.release} (${cfg.codeName})";
};
"os-release".text = attrsToText osReleaseContents;
};
};
# uses version info nixpkgs, which requires a full nixpkgs path
meta.buildDocsInSandbox = false;
}