diff options
Diffstat (limited to 'nixpkgs/nixos/modules/system/activation/top-level.nix')
| -rw-r--r-- | nixpkgs/nixos/modules/system/activation/top-level.nix | 280 |
1 files changed, 280 insertions, 0 deletions
diff --git a/nixpkgs/nixos/modules/system/activation/top-level.nix b/nixpkgs/nixos/modules/system/activation/top-level.nix new file mode 100644 index 000000000000..a560af5ce96d --- /dev/null +++ b/nixpkgs/nixos/modules/system/activation/top-level.nix @@ -0,0 +1,280 @@ +{ config, lib, pkgs, modules, baseModules, ... }: + +with lib; + +let + + + # This attribute is responsible for creating boot entries for + # child configuration. They are only (directly) accessible + # when the parent configuration is boot default. For example, + # you can provide an easy way to boot the same configuration + # as you use, but with another kernel + # !!! fix this + cloner = inheritParent: list: + map (childConfig: + (import ../../../lib/eval-config.nix { + inherit baseModules; + modules = + (optionals inheritParent modules) + ++ [ ./no-clone.nix ] + ++ [ childConfig ]; + }).config.system.build.toplevel + ) list; + + children = + cloner false config.nesting.children + ++ cloner true config.nesting.clone; + + systemBuilder = + let + kernelPath = "${config.boot.kernelPackages.kernel}/" + + "${config.system.boot.loader.kernelFile}"; + initrdPath = "${config.system.build.initialRamdisk}/" + + "${config.system.boot.loader.initrdFile}"; + in '' + mkdir $out + + # Containers don't have their own kernel or initrd. They boot + # directly into stage 2. + ${optionalString (!config.boot.isContainer) '' + if [ ! -f ${kernelPath} ]; then + echo "The bootloader cannot find the proper kernel image." + echo "(Expecting ${kernelPath})" + false + fi + + ln -s ${kernelPath} $out/kernel + ln -s ${config.system.modulesTree} $out/kernel-modules + ${optionalString (pkgs.stdenv.hostPlatform.platform.kernelDTB or false) '' + ln -s ${config.boot.kernelPackages.kernel}/dtbs $out/dtbs + ''} + + echo -n "$kernelParams" > $out/kernel-params + + ln -s ${initrdPath} $out/initrd + + ln -s ${config.system.build.initialRamdiskSecretAppender}/bin/append-initrd-secrets $out + + ln -s ${config.hardware.firmware}/lib/firmware $out/firmware + ''} + + echo "$activationScript" > $out/activate + substituteInPlace $out/activate --subst-var out + chmod u+x $out/activate + unset activationScript + + cp ${config.system.build.bootStage2} $out/init + substituteInPlace $out/init --subst-var-by systemConfig $out + + ln -s ${config.system.build.etc}/etc $out/etc + ln -s ${config.system.path} $out/sw + ln -s "$systemd" $out/systemd + + echo -n "$configurationName" > $out/configuration-name + echo -n "systemd ${toString config.systemd.package.interfaceVersion}" > $out/init-interface-version + echo -n "$nixosLabel" > $out/nixos-version + echo -n "${pkgs.stdenv.hostPlatform.system}" > $out/system + + mkdir $out/fine-tune + childCount=0 + for i in $children; do + childCount=$(( childCount + 1 )) + ln -s $i $out/fine-tune/child-$childCount + done + + mkdir $out/bin + export localeArchive="${config.i18n.glibcLocales}/lib/locale/locale-archive" + substituteAll ${./switch-to-configuration.pl} $out/bin/switch-to-configuration + chmod +x $out/bin/switch-to-configuration + + echo -n "${toString config.system.extraDependencies}" > $out/extra-dependencies + + ${config.system.extraSystemBuilderCmds} + ''; + + # Putting it all together. This builds a store path containing + # symlinks to the various parts of the built configuration (the + # kernel, systemd units, init scripts, etc.) as well as a script + # `switch-to-configuration' that activates the configuration and + # makes it bootable. + baseSystem = pkgs.stdenvNoCC.mkDerivation { + name = let hn = config.networking.hostName; + nn = if (hn != "") then hn else "unnamed"; + in "nixos-system-${nn}-${config.system.nixos.label}"; + preferLocalBuild = true; + allowSubstitutes = false; + buildCommand = systemBuilder; + + inherit (pkgs) utillinux coreutils; + systemd = config.systemd.package; + shell = "${pkgs.bash}/bin/sh"; + su = "${pkgs.shadow.su}/bin/su"; + + inherit children; + kernelParams = config.boot.kernelParams; + installBootLoader = + config.system.build.installBootLoader + or "echo 'Warning: do not know how to make this configuration bootable; please enable a boot loader.' 1>&2; true"; + activationScript = config.system.activationScripts.script; + nixosLabel = config.system.nixos.label; + + configurationName = config.boot.loader.grub.configurationName; + + # Needed by switch-to-configuration. + + perl = "${pkgs.perl}/bin/perl " + (concatMapStringsSep " " (lib: "-I${lib}/${pkgs.perl.libPrefix}") (with pkgs.perlPackages; [ FileSlurp NetDBus XMLParser XMLTwig ])); + }; + + # Handle assertions and warnings + + failedAssertions = map (x: x.message) (filter (x: !x.assertion) config.assertions); + + showWarnings = res: fold (w: x: builtins.trace "[1;31mwarning: ${w}[0m" x) res config.warnings; + + baseSystemAssertWarn = if failedAssertions != [] + then throw "\nFailed assertions:\n${concatStringsSep "\n" (map (x: "- ${x}") failedAssertions)}" + else showWarnings baseSystem; + + # Replace runtime dependencies + system = fold ({ oldDependency, newDependency }: drv: + pkgs.replaceDependency { inherit oldDependency newDependency drv; } + ) baseSystemAssertWarn config.system.replaceRuntimeDependencies; + +in + +{ + options = { + + system.build = mkOption { + internal = true; + default = {}; + type = types.attrs; + description = '' + Attribute set of derivations used to setup the system. + ''; + }; + + nesting.children = mkOption { + default = []; + description = '' + Additional configurations to build. + ''; + }; + + nesting.clone = mkOption { + default = []; + description = '' + Additional configurations to build based on the current + configuration which then has a lower priority. + + To switch to a cloned configuration (e.g. <literal>child-1</literal>) + at runtime, run + + <programlisting> + # sudo /run/current-system/fine-tune/child-1/bin/switch-to-configuration test + </programlisting> + ''; + }; + + system.boot.loader.id = mkOption { + internal = true; + default = ""; + description = '' + Id string of the used bootloader. + ''; + }; + + system.boot.loader.kernelFile = mkOption { + internal = true; + default = pkgs.stdenv.hostPlatform.platform.kernelTarget; + type = types.str; + description = '' + Name of the kernel file to be passed to the bootloader. + ''; + }; + + system.boot.loader.initrdFile = mkOption { + internal = true; + default = "initrd"; + type = types.str; + description = '' + Name of the initrd file to be passed to the bootloader. + ''; + }; + + system.copySystemConfiguration = mkOption { + type = types.bool; + default = false; + description = '' + If enabled, copies the NixOS configuration file + (usually <filename>/etc/nixos/configuration.nix</filename>) + and links it from the resulting system + (getting to <filename>/run/current-system/configuration.nix</filename>). + Note that only this single file is copied, even if it imports others. + ''; + }; + + system.extraSystemBuilderCmds = mkOption { + type = types.lines; + internal = true; + default = ""; + description = '' + This code will be added to the builder creating the system store path. + ''; + }; + + system.extraDependencies = mkOption { + type = types.listOf types.package; + default = []; + description = '' + A list of packages that should be included in the system + closure but not otherwise made available to users. This is + primarily used by the installation tests. + ''; + }; + + system.replaceRuntimeDependencies = mkOption { + default = []; + example = lib.literalExample "[ ({ original = pkgs.openssl; replacement = pkgs.callPackage /path/to/openssl { }; }) ]"; + type = types.listOf (types.submodule ( + { ... }: { + options.original = mkOption { + type = types.package; + description = "The original package to override."; + }; + + options.replacement = mkOption { + type = types.package; + description = "The replacement package."; + }; + }) + ); + apply = map ({ original, replacement, ... }: { + oldDependency = original; + newDependency = replacement; + }); + description = '' + List of packages to override without doing a full rebuild. + The original derivation and replacement derivation must have the same + name length, and ideally should have close-to-identical directory layout. + ''; + }; + + }; + + + config = { + + system.extraSystemBuilderCmds = + optionalString + config.system.copySystemConfiguration + ''ln -s '${import ../../../lib/from-env.nix "NIXOS_CONFIG" <nixos-config>}' \ + "$out/configuration.nix" + ''; + + system.build.toplevel = system; + + }; + +} |