nixpkgs/nixos/modules/system/activation/top-level.nix
Vladimír Čunát f8516a0717 nixos copySystemConfiguration: fix when chrooted
Fixes #7974. Also makes the description more informative.
2016-02-28 10:08:42 +01:00

251 lines
7.7 KiB
Nix
Raw Blame History

This file contains invisible Unicode characters

This file contains invisible Unicode characters that are indistinguishable to humans but may be processed differently by a computer. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

{ 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}";
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} $out/kernel-modules
echo -n "$kernelParams" > $out/kernel-params
ln -s ${config.system.build.initialRamdisk}/initrd $out/initrd
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" > $out/nixos-version
echo -n "$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
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}
'';
# Handle assertions
failed = map (x: x.message) (filter (x: !x.assertion) config.assertions);
showWarnings = res: fold (w: x: builtins.trace "warning: ${w}" x) res config.warnings;
# Putting it all together. This builds a store path containing
# symlinks to the various parts of the built configuration (the
# kernel, systemd units, init scripts, etc.) as well as a script
# `switch-to-configuration' that activates the configuration and
# makes it bootable.
baseSystem = showWarnings (
if [] == failed then pkgs.stdenv.mkDerivation {
name = let hn = config.networking.hostName;
nn = if (hn != "") then hn else "unnamed";
in "nixos-system-${nn}-${config.system.nixosLabel}";
preferLocalBuild = true;
allowSubstitutes = false;
buildCommand = systemBuilder;
inherit (pkgs) utillinux coreutils;
systemd = config.systemd.package;
inherit children;
kernelParams = config.boot.kernelParams;
installBootLoader =
config.system.build.installBootLoader
or "echo 'Warning: do not know how to make this configuration bootable; please enable a boot loader.' 1>&2; true";
activationScript = config.system.activationScripts.script;
nixosLabel = config.system.nixosLabel;
configurationName = config.boot.loader.grub.configurationName;
# Needed by switch-to-configuration.
perl = "${pkgs.perl}/bin/perl -I${pkgs.perlPackages.FileSlurp}/lib/perl5/site_perl";
} else throw "\nFailed assertions:\n${concatStringsSep "\n" (map (x: "- ${x}") failed)}");
# Replace runtime dependencies
system = fold ({ oldDependency, newDependency }: drv:
pkgs.replaceDependency { inherit oldDependency newDependency drv; }
) baseSystem config.system.replaceRuntimeDependencies;
in
{
options = {
system.build = mkOption {
internal = true;
default = {};
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.
'';
};
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.platform.kernelTarget;
type = types.str;
description = ''
Name of the kernel 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, ... }: {
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;
};
}