75 lines
2.1 KiB
Nix
75 lines
2.1 KiB
Nix
{ config, lib, ... }:
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with lib;
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let
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cfg = config.system.nixos;
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in
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{
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options.system = {
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nixos.label = mkOption {
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type = types.strMatching "[a-zA-Z0-9:_\\.-]*";
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description = ''
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NixOS version name to be used in the names of generated
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outputs and boot labels.
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If you ever wanted to influence the labels in your GRUB menu,
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this is the option for you.
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It can only contain letters, numbers and the following symbols:
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<literal>:</literal>, <literal>_</literal>, <literal>.</literal> and <literal>-</literal>.
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The default is <option>system.nixos.tags</option> separated by
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"-" + "-" + <envar>NIXOS_LABEL_VERSION</envar> environment
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variable (defaults to the value of
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<option>system.nixos.version</option>).
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Can be overriden by setting <envar>NIXOS_LABEL</envar>.
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Useful for not loosing track of configurations built from different
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nixos branches/revisions, e.g.:
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<screen>
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#!/bin/sh
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today=`date +%Y%m%d`
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branch=`(cd nixpkgs ; git branch 2>/dev/null | sed -n '/^\* / { s|^\* ||; p; }')`
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revision=`(cd nixpkgs ; git rev-parse HEAD)`
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export NIXOS_LABEL_VERSION="$today.$branch-''${revision:0:7}"
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nixos-rebuild switch</screen>
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'';
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};
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nixos.tags = mkOption {
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type = types.listOf types.str;
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default = [];
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example = [ "with-xen" ];
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description = ''
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Strings to prefix to the default
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<option>system.nixos.label</option>.
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Useful for not loosing track of configurations built with
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different options, e.g.:
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<screen>
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{
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system.nixos.tags = [ "with-xen" ];
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virtualisation.xen.enable = true;
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}
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</screen>
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'';
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};
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};
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config = {
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# This is set here rather than up there so that changing it would
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# not rebuild the manual
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system.nixos.label = mkDefault (maybeEnv "NIXOS_LABEL"
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(concatStringsSep "-" ((sort (x: y: x < y) cfg.tags)
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++ [ (maybeEnv "NIXOS_LABEL_VERSION" cfg.version) ])));
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};
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}
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