104 lines
3.5 KiB
Nix
104 lines
3.5 KiB
Nix
{ lib, config, pkgs, ... }:
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let
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templateSubmodule = {...}: {
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options = {
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enable = lib.mkEnableOption "this template";
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target = lib.mkOption {
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description = "Path in the container";
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type = lib.types.path;
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};
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template = lib.mkOption {
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description = ".tpl file for rendering the target";
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type = lib.types.path;
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};
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when = lib.mkOption {
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description = "Events which trigger a rewrite (create, copy)";
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type = lib.types.listOf (lib.types.str);
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};
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properties = lib.mkOption {
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description = "Additional properties";
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type = lib.types.attrs;
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default = {};
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};
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};
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};
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toYAML = name: data: pkgs.writeText name (lib.generators.toYAML {} data);
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cfg = config.virtualisation.lxc;
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templates = if cfg.templates != {} then let
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list = lib.mapAttrsToList (name: value: { inherit name; } // value)
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(lib.filterAttrs (name: value: value.enable) cfg.templates);
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in
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{
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files = map (tpl: {
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source = tpl.template;
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target = "/templates/${tpl.name}.tpl";
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}) list;
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properties = lib.listToAttrs (map (tpl: lib.nameValuePair tpl.target {
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when = tpl.when;
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template = "${tpl.name}.tpl";
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properties = tpl.properties;
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}) list);
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}
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else { files = []; properties = {}; };
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in {
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options = {
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virtualisation.lxc = {
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templates = lib.mkOption {
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description = "Templates for LXD";
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type = lib.types.attrsOf (lib.types.submodule templateSubmodule);
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default = {};
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example = lib.literalExpression ''
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{
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# create /etc/hostname on container creation
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"hostname" = {
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enable = true;
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target = "/etc/hostname";
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template = builtins.writeFile "hostname.tpl" "{{ container.name }}";
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when = [ "create" ];
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};
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# create /etc/nixos/hostname.nix with a configuration for keeping the hostname applied
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"hostname-nix" = {
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enable = true;
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target = "/etc/nixos/hostname.nix";
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template = builtins.writeFile "hostname-nix.tpl" "{ ... }: { networking.hostName = "{{ container.name }}"; }";
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# copy keeps the file updated when the container is changed
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when = [ "create" "copy" ];
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};
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# copy allow the user to specify a custom configuration.nix
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"configuration-nix" = {
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enable = true;
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target = "/etc/nixos/configuration.nix";
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template = builtins.writeFile "configuration-nix" "{{ config_get(\"user.user-data\", properties.default) }}";
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when = [ "create" ];
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};
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};
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'';
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};
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};
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};
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config = {
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system.build.metadata = pkgs.callPackage ../../lib/make-system-tarball.nix {
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contents = [
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{
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source = toYAML "metadata.yaml" {
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architecture = builtins.elemAt (builtins.match "^([a-z0-9_]+).+" (toString pkgs.system)) 0;
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creation_date = 1;
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properties = {
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description = "${config.system.nixos.distroName} ${config.system.nixos.codeName} ${config.system.nixos.label} ${pkgs.system}";
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os = "${config.system.nixos.distroId}";
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release = "${config.system.nixos.codeName}";
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};
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templates = templates.properties;
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};
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target = "/metadata.yaml";
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}
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] ++ templates.files;
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};
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};
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}
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