119c8f91e7
Setting nixosVersion to something custom is useful for meaningful GRUB menus and /nix/store paths, but actuallly changing it rebulids the whole system path (because of `nixos-version` script and manual pages). Also, changing it is not a particularly good idea because you can then be differentitated from other NixOS users by a lot of programs that read /etc/os-release. This patch introduces an alternative option that does all you want from nixosVersion, but rebuilds only the very top system level and /etc while using your label in the names of system /nix/store paths, GRUB and other boot loaders' menus, getty greetings and so on.
247 lines
7.5 KiB
Nix
247 lines
7.5 KiB
Nix
{ config, lib, pkgs, modules, baseModules, ... }:
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with lib;
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let
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# This attribute is responsible for creating boot entries for
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# child configuration. They are only (directly) accessible
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# when the parent configuration is boot default. For example,
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# you can provide an easy way to boot the same configuration
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# as you use, but with another kernel
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# !!! fix this
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cloner = inheritParent: list:
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map (childConfig:
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(import ../../../lib/eval-config.nix {
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inherit baseModules;
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modules =
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(optionals inheritParent modules)
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++ [ ./no-clone.nix ]
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++ [ childConfig ];
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}).config.system.build.toplevel
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) list;
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children =
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cloner false config.nesting.children
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++ cloner true config.nesting.clone;
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systemBuilder =
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let
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kernelPath = "${config.boot.kernelPackages.kernel}/" +
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"${config.system.boot.loader.kernelFile}";
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in ''
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mkdir $out
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# Containers don't have their own kernel or initrd. They boot
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# directly into stage 2.
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${optionalString (!config.boot.isContainer) ''
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if [ ! -f ${kernelPath} ]; then
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echo "The bootloader cannot find the proper kernel image."
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echo "(Expecting ${kernelPath})"
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false
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fi
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ln -s ${kernelPath} $out/kernel
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ln -s ${config.system.modulesTree} $out/kernel-modules
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echo -n "$kernelParams" > $out/kernel-params
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ln -s ${config.system.build.initialRamdisk}/initrd $out/initrd
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ln -s ${config.hardware.firmware}/lib/firmware $out/firmware
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''}
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echo "$activationScript" > $out/activate
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substituteInPlace $out/activate --subst-var out
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chmod u+x $out/activate
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unset activationScript
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cp ${config.system.build.bootStage2} $out/init
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substituteInPlace $out/init --subst-var-by systemConfig $out
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ln -s ${config.system.build.etc}/etc $out/etc
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ln -s ${config.system.path} $out/sw
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ln -s "$systemd" $out/systemd
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echo -n "$configurationName" > $out/configuration-name
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echo -n "systemd ${toString config.systemd.package.interfaceVersion}" > $out/init-interface-version
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echo -n "$nixosLabel" > $out/nixos-version
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echo -n "$system" > $out/system
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mkdir $out/fine-tune
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childCount=0
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for i in $children; do
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childCount=$(( childCount + 1 ))
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ln -s $i $out/fine-tune/child-$childCount
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done
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mkdir $out/bin
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substituteAll ${./switch-to-configuration.pl} $out/bin/switch-to-configuration
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chmod +x $out/bin/switch-to-configuration
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echo -n "${toString config.system.extraDependencies}" > $out/extra-dependencies
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${config.system.extraSystemBuilderCmds}
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'';
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# Handle assertions
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failed = map (x: x.message) (filter (x: !x.assertion) config.assertions);
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showWarnings = res: fold (w: x: builtins.trace "[1;31mwarning: ${w}[0m" x) res config.warnings;
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# Putting it all together. This builds a store path containing
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# symlinks to the various parts of the built configuration (the
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# kernel, systemd units, init scripts, etc.) as well as a script
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# `switch-to-configuration' that activates the configuration and
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# makes it bootable.
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baseSystem = showWarnings (
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if [] == failed then pkgs.stdenv.mkDerivation {
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name = let hn = config.networking.hostName;
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nn = if (hn != "") then hn else "unnamed";
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in "nixos-system-${nn}-${config.system.nixosLabel}";
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preferLocalBuild = true;
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allowSubstitutes = false;
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buildCommand = systemBuilder;
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inherit (pkgs) utillinux coreutils;
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systemd = config.systemd.package;
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inherit children;
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kernelParams = config.boot.kernelParams;
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installBootLoader =
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config.system.build.installBootLoader
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or "echo 'Warning: do not know how to make this configuration bootable; please enable a boot loader.' 1>&2; true";
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activationScript = config.system.activationScripts.script;
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nixosLabel = config.system.nixosLabel;
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configurationName = config.boot.loader.grub.configurationName;
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# Needed by switch-to-configuration.
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perl = "${pkgs.perl}/bin/perl -I${pkgs.perlPackages.FileSlurp}/lib/perl5/site_perl";
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} else throw "\nFailed assertions:\n${concatStringsSep "\n" (map (x: "- ${x}") failed)}");
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# Replace runtime dependencies
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system = fold ({ oldDependency, newDependency }: drv:
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pkgs.replaceDependency { inherit oldDependency newDependency drv; }
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) baseSystem config.system.replaceRuntimeDependencies;
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in
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{
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options = {
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system.build = mkOption {
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internal = true;
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default = {};
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description = ''
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Attribute set of derivations used to setup the system.
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'';
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};
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nesting.children = mkOption {
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default = [];
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description = ''
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Additional configurations to build.
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'';
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};
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nesting.clone = mkOption {
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default = [];
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description = ''
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Additional configurations to build based on the current
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configuration which then has a lower priority.
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'';
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};
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system.boot.loader.id = mkOption {
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internal = true;
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default = "";
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description = ''
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Id string of the used bootloader.
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'';
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};
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system.boot.loader.kernelFile = mkOption {
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internal = true;
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default = pkgs.stdenv.platform.kernelTarget;
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type = types.str;
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description = ''
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Name of the kernel file to be passed to the bootloader.
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'';
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};
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system.copySystemConfiguration = mkOption {
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type = types.bool;
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default = false;
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description = ''
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If enabled, copies the NixOS configuration file
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<literal>$NIXOS_CONFIG</literal> (usually
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<filename>/etc/nixos/configuration.nix</filename>)
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to the system store path.
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'';
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};
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system.extraSystemBuilderCmds = mkOption {
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type = types.lines;
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internal = true;
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default = "";
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description = ''
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This code will be added to the builder creating the system store path.
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'';
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};
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system.extraDependencies = mkOption {
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type = types.listOf types.package;
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default = [];
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description = ''
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A list of packages that should be included in the system
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closure but not otherwise made available to users. This is
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primarily used by the installation tests.
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'';
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};
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system.replaceRuntimeDependencies = mkOption {
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default = [];
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example = lib.literalExample "[ ({ original = pkgs.openssl; replacement = pkgs.callPackage /path/to/openssl { ... }; }) ]";
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type = types.listOf (types.submodule (
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{ options, ... }: {
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options.original = mkOption {
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type = types.package;
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description = "The original package to override.";
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};
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options.replacement = mkOption {
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type = types.package;
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description = "The replacement package.";
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};
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})
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);
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apply = map ({ original, replacement, ... }: {
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oldDependency = original;
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newDependency = replacement;
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});
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description = ''
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List of packages to override without doing a full rebuild.
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The original derivation and replacement derivation must have the same
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name length, and ideally should have close-to-identical directory layout.
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'';
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};
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};
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config = {
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system.extraSystemBuilderCmds =
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optionalString
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config.system.copySystemConfiguration
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"cp ${maybeEnv "NIXOS_CONFIG" "/etc/nixos/configuration.nix"} $out";
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system.build.toplevel = system;
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};
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}
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