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system-version: add system.stateVersion option

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Daiderd Jordan 2017-10-01 16:11:17 +02:00
parent d371ec0208
commit cf9f74596a
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3 changed files with 77 additions and 5 deletions
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1
default.nix
View file

@ -31,6 +31,7 @@ let
./modules/system/applications.nix
./modules/system/etc.nix
./modules/system/launchd.nix
./modules/system/version.nix
./modules/time
./modules/networking
./modules/nix

5
modules/system/default.nix
View file

@ -42,11 +42,6 @@ in
'';
};
system.darwinLabel = mkOption {
type = types.str;
default = pkgs.lib.nixpkgsVersion;
};
assertions = mkOption {
type = types.listOf types.unspecified;
internal = true;

76
modules/system/version.nix Normal file
View file

@ -0,0 +1,76 @@
{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.system;
gitCommitId = lib.substring 0 7 (commitIdFromGitRepo gitRepo);
gitRepo = "${toString pkgs.path}/.git";
releaseFile = "${toString pkgs.path}/.version";
revisionFile = "${toString pkgs.path}/.git-revision";
suffixFile = "${toString pkgs.path}/.version-suffix";
in
{
options = {
system.stateVersion = mkOption {
type = types.int;
default = 2;
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).
'';
};
system.darwinLabel = mkOption {
type = types.str;
default = cfg.nixpkgsVersion;
description = "Label to be used in the names of generated outputs.";
};
system.nixpkgsRelease = mkOption {
readOnly = true;
type = types.str;
default = fileContents releaseFile;
description = "The nixpkgs release (e.g. <literal>16.03</literal>).";
};
system.nixpkgsVersion = mkOption {
internal = true;
type = types.str;
description = "The full nixpkgs version (e.g. <literal>16.03.1160.f2d4ee1</literal>).";
};
system.nixpkgsVersionSuffix = mkOption {
internal = true;
type = types.str;
default = "pre-git";
description = "The nixpkgs version suffix (e.g. <literal>1160.f2d4ee1</literal>).";
};
system.nixpkgsRevision = mkOption {
internal = true;
type = types.str;
default = "master";
description = "The nixpkgs git revision from which this configuration was built.";
};
};
config = {
# These defaults are set here rather than up there so that
# changing them would not rebuild the manual
system.nixpkgsVersion = mkDefault (cfg.nixpkgsRelease + cfg.nixpkgsVersionSuffix);
system.nixpkgsRevision = mkIf (pathIsDirectory gitRepo) (mkDefault gitCommitId);
system.nixpkgsVersionSuffix = mkIf (pathIsDirectory gitRepo) (mkDefault (".git." + gitCommitId));
};
}