216 lines
7 KiB
Nix
216 lines
7 KiB
Nix
{ lib, config, pkgs, ... }:
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with lib;
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let
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templateSubmodule = { ... }: {
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options = {
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enable = mkEnableOption (lib.mdDoc "this template");
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target = mkOption {
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description = lib.mdDoc "Path in the container";
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type = types.path;
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};
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template = mkOption {
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description = lib.mdDoc ".tpl file for rendering the target";
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type = types.path;
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};
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when = mkOption {
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description = lib.mdDoc "Events which trigger a rewrite (create, copy)";
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type = types.listOf (types.str);
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};
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properties = mkOption {
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description = lib.mdDoc "Additional properties";
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type = 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 (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 = mapAttrsToList (name: value: { inherit name; } // value)
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(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/${tpl.name}.tpl";
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}) list;
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properties = listToAttrs (map (tpl: nameValuePair tpl.target {
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when = tpl.when;
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template = "${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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{
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imports = [
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../installer/cd-dvd/channel.nix
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../profiles/clone-config.nix
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../profiles/minimal.nix
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];
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options = {
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virtualisation.lxc = {
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templates = mkOption {
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description = lib.mdDoc "Templates for LXD";
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type = types.attrsOf (types.submodule (templateSubmodule));
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default = {};
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example = literalExpression ''
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{
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# create /etc/hostname on container creation. also requires networking.hostName = "" to be set
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"hostname" = {
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enable = true;
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target = "/etc/hostname";
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template = builtins.toFile "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.toFile "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.toFile "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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privilegedContainer = mkOption {
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type = types.bool;
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default = false;
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description = lib.mdDoc ''
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Whether this LXC container will be running as a privileged container or not. If set to `true` then
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additional configuration will be applied to the `systemd` instance running within the container as
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recommended by [distrobuilder](https://linuxcontainers.org/distrobuilder/introduction/).
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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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boot.isContainer = true;
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boot.postBootCommands =
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''
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# After booting, register the contents of the Nix store in the Nix
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# database.
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if [ -f /nix-path-registration ]; then
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${config.nix.package.out}/bin/nix-store --load-db < /nix-path-registration &&
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rm /nix-path-registration
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fi
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# nixos-rebuild also requires a "system" profile
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${config.nix.package.out}/bin/nix-env -p /nix/var/nix/profiles/system --set /run/current-system
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'';
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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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# TODO: build rootfs as squashfs for faster unpack
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system.build.tarball = pkgs.callPackage ../../lib/make-system-tarball.nix {
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extraArgs = "--owner=0";
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storeContents = [
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{
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object = config.system.build.toplevel;
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symlink = "none";
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}
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];
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contents = [
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{
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source = config.system.build.toplevel + "/init";
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target = "/sbin/init";
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}
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# Technically this is not required for lxc, but having also make this configuration work with systemd-nspawn.
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# Nixos will setup the same symlink after start.
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{
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source = config.system.build.toplevel + "/etc/os-release";
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target = "/etc/os-release";
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}
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];
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extraCommands = "mkdir -p proc sys dev";
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};
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# Add the overrides from lxd distrobuilder
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# https://github.com/lxc/distrobuilder/blob/05978d0d5a72718154f1525c7d043e090ba7c3e0/distrobuilder/main.go#L630
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systemd.packages = [
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(pkgs.writeTextFile {
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name = "systemd-lxc-service-overrides";
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destination = "/etc/systemd/system/service.d/zzz-lxc-service.conf";
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text = ''
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[Service]
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ProcSubset=all
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ProtectProc=default
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ProtectControlGroups=no
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ProtectKernelTunables=no
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NoNewPrivileges=no
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LoadCredential=
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'' + optionalString cfg.privilegedContainer ''
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# Additional settings for privileged containers
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ProtectHome=no
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ProtectSystem=no
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PrivateDevices=no
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PrivateTmp=no
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ProtectKernelLogs=no
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ProtectKernelModules=no
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ReadWritePaths=
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'';
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})
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];
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# Allow the user to login as root without password.
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users.users.root.initialHashedPassword = mkOverride 150 "";
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system.activationScripts.installInitScript = mkForce ''
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ln -fs $systemConfig/init /sbin/init
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'';
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# Some more help text.
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services.getty.helpLine =
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''
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Log in as "root" with an empty password.
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'';
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# Containers should be light-weight, so start sshd on demand.
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services.openssh.enable = mkDefault true;
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services.openssh.startWhenNeeded = mkDefault true;
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# As this is intended as a standalone image, undo some of the minimal profile stuff
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environment.noXlibs = false;
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documentation.enable = true;
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documentation.nixos.enable = true;
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services.logrotate.enable = true;
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};
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}
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