nixpkgs/nixos/modules/misc/version.nix
Franz Pletz 46773a15b3
nixos/version: fix case where .git is a symlink
Before c9214c394b and
9d396d2e42 if .git is symlink the version
would gracefully default to no git revision. With those changes an
exception is thrown instead.

This introduces a new function `pathIsGitRepo` that checks if
`commitIdFromGitRepo` fails without error so we don't have to
reimplement this logic again and can fail gracefully.
2020-01-20 00:53:44 +01:00

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{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.system.nixos;
gitRepo = "${toString pkgs.path}/.git";
gitRepoValid = lib.pathIsGitRepo gitRepo;
gitCommitId = lib.substring 0 7 (commitIdFromGitRepo gitRepo);
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.str;
default = trivial.revisionWithDefault "master";
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;
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).
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 = "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 gitRepoValid (mkDefault gitCommitId);
versionSuffix = mkIf gitRepoValid (mkDefault (".git." + gitCommitId));
};
# 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 ${cfg.release} (${cfg.codeName})"
LOGO="nix-snowflake"
HOME_URL="https://nixos.org/"
DOCUMENTATION_URL="https://nixos.org/nixos/manual/index.html"
SUPPORT_URL="https://nixos.org/nixos/support.html"
BUG_REPORT_URL="https://github.com/NixOS/nixpkgs/issues"
'';
};
}