129 lines
3.9 KiB
Nix
129 lines
3.9 KiB
Nix
{ config, lib, pkgs, ... }:
|
|
|
|
with lib;
|
|
|
|
let
|
|
cfg = config.system;
|
|
|
|
releaseFile = "${toString pkgs.path}/.version";
|
|
suffixFile = "${toString pkgs.path}/.version-suffix";
|
|
revisionFile = "${toString pkgs.path}/.git-revision";
|
|
gitRepo = "${toString pkgs.path}/.git";
|
|
gitCommitId = lib.substring 0 7 (commitIdFromGitRepo gitRepo);
|
|
in
|
|
|
|
{
|
|
|
|
options.system = {
|
|
|
|
stateVersion = mkOption {
|
|
type = types.str;
|
|
default = cfg.nixosRelease;
|
|
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).
|
|
'';
|
|
};
|
|
|
|
nixosLabel = mkOption {
|
|
type = types.str;
|
|
description = ''
|
|
NixOS version name to be used in the names of generated
|
|
outputs and boot labels.
|
|
|
|
If you ever wanted to influence the labels in your GRUB menu,
|
|
this is option is for you.
|
|
|
|
Can be set directly or with <envar>NIXOS_LABEL</envar>
|
|
environment variable for <command>nixos-rebuild</command>,
|
|
e.g.:
|
|
|
|
<screen>
|
|
#!/bin/sh
|
|
today=`date +%Y%m%d`
|
|
branch=`(cd nixpkgs ; git branch 2>/dev/null | sed -n '/^\* / { s|^\* ||; p; }')`
|
|
revision=`(cd nixpkgs ; git rev-parse HEAD)`
|
|
export NIXOS_LABEL="$today.$branch-''${revision:0:7}"
|
|
nixos-rebuild switch</screen>
|
|
'';
|
|
};
|
|
|
|
nixosVersion = mkOption {
|
|
internal = true;
|
|
type = types.str;
|
|
description = "NixOS version.";
|
|
};
|
|
|
|
nixosRelease = mkOption {
|
|
readOnly = true;
|
|
type = types.str;
|
|
default = readFile releaseFile;
|
|
description = "NixOS release.";
|
|
};
|
|
|
|
nixosVersionSuffix = mkOption {
|
|
internal = true;
|
|
type = types.str;
|
|
default = if pathExists suffixFile then readFile suffixFile else "pre-git";
|
|
description = "NixOS version suffix.";
|
|
};
|
|
|
|
nixosRevision = mkOption {
|
|
internal = true;
|
|
type = types.str;
|
|
default = if pathExists revisionFile then readFile revisionFile else "master";
|
|
description = "NixOS Git revision hash.";
|
|
};
|
|
|
|
nixosCodeName = mkOption {
|
|
readOnly = true;
|
|
type = types.str;
|
|
description = "NixOS release code name.";
|
|
};
|
|
|
|
defaultChannel = mkOption {
|
|
internal = true;
|
|
type = types.str;
|
|
default = https://nixos.org/channels/nixos-unstable;
|
|
description = "Default NixOS channel to which the root user is subscribed.";
|
|
};
|
|
|
|
};
|
|
|
|
config = {
|
|
|
|
system = {
|
|
# These defaults are set here rather than up there so that
|
|
# changing them would not rebuild the manual
|
|
nixosLabel = mkDefault (maybeEnv "NIXOS_LABEL" cfg.nixosVersion);
|
|
nixosVersion = mkDefault (maybeEnv "NIXOS_VERSION" (cfg.nixosRelease + cfg.nixosVersionSuffix));
|
|
nixosRevision = mkIf (pathIsDirectory gitRepo) (mkDefault gitCommitId);
|
|
nixosVersionSuffix = mkIf (pathIsDirectory gitRepo) (mkDefault (".git." + gitCommitId));
|
|
|
|
# Note: code names must only increase in alphabetical order.
|
|
nixosCodeName = "Flounder";
|
|
};
|
|
|
|
# Generate /etc/os-release. See
|
|
# http://0pointer.de/public/systemd-man/os-release.html for the
|
|
# format.
|
|
environment.etc."os-release".text =
|
|
''
|
|
NAME=NixOS
|
|
ID=nixos
|
|
VERSION="${config.system.nixosVersion} (${config.system.nixosCodeName})"
|
|
VERSION_ID="${config.system.nixosVersion}"
|
|
PRETTY_NAME="NixOS ${config.system.nixosVersion} (${config.system.nixosCodeName})"
|
|
HOME_URL="http://nixos.org/"
|
|
'';
|
|
|
|
};
|
|
|
|
}
|