nixpkgs/nixos/modules/misc/version.nix
Franz Pletz 70c6f6572d
nixos/version: fix nixops pre 1.6 compatibility
We should be able to deploy a NixOS 18.03 system with the current nixops
stable release. Some options were renamed, so instead of
`mkRenamedOptionModule` we introduce them as read-only interal options
that won't be rendered in the manual.

Only the options that are needed to make nixops evaluations succeed were
added.

This commit should probably be reverted after or before the 18.09 release,
depending on the nixops 1.6 release.

The user will not get the warning that these have been renamed but
this change is mentioned in the release notes.

Fixes #34253.
2018-03-28 02:30:50 +02:00

126 lines
4.0 KiB
Nix

{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.system.nixos;
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 = {
# XXX: Reintroduce old options to make nixops before 1.6 able to evaluate configurations
# XXX: Remove after nixops has been bumped to a compatible version
nixosVersion = mkOption {
readOnly = true;
internal = true;
type = types.str;
default = config.system.nixos.version;
};
nixosVersionSuffix = mkOption {
readOnly = true;
internal = true;
type = types.str;
default = config.system.nixos.versionSuffix;
};
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 = fileContents releaseFile;
description = "The NixOS release (e.g. <literal>16.03</literal>).";
};
nixos.versionSuffix = mkOption {
internal = true;
type = types.str;
default = if pathExists suffixFile then fileContents suffixFile else "pre-git";
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 = {
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"
'';
};
}