nixpkgs/modules/system/activation/top-level.nix

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{pkgs, config, ...}:
let
options = {
system.build = pkgs.lib.mkOption {
default = {};
description = ''
Attribute set of derivations used to setup the system.
'';
};
nesting.children = pkgs.lib.mkOption {
default = [];
description = ''
Additional configurations to build.
'';
};
};
# 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
children = map (x: ((import ./system.nix)
{ platform = pkgs.system;
configuration = x//{boot=((x.boot)//{grubDevice = "";});};}).system)
config.nesting.children;
systemBuilder =
''
ensureDir $out
ln -s ${config.boot.kernelPackages.kernel}/vmlinuz $out/kernel
ln -s $grub $out/grub
ln -s ${config.system.build.bootStage2} $out/init
ln -s ${config.system.build.initialRamdisk}/initrd $out/initrd
ln -s ${config.system.activationScripts.script} $out/activate
ln -s ${config.system.build.etc}/etc $out/etc
ln -s ${config.system.path} $out/sw
ln -s ${pkgs.upstart} $out/upstart
echo "$kernelParams" > $out/kernel-params
echo "$configurationName" > $out/configuration-name
echo "${toString pkgs.upstart.interfaceVersion}" > $out/upstart-interface-version
mkdir $out/fine-tune
childCount=0;
for i in $children; do
childCount=$(( childCount + 1 ));
ln -s $i $out/fine-tune/child-$childCount;
done
ensureDir $out/bin
substituteAll ${./switch-to-configuration.sh} $out/bin/switch-to-configuration
chmod +x $out/bin/switch-to-configuration
'';
# Putting it all together. This builds a store path containing
# symlinks to the various parts of the built configuration (the
# kernel, the Upstart services, the init scripts, etc.) as well as a
# script `switch-to-configuration' that activates the configuration
# and makes it bootable.
system = pkgs.stdenv.mkDerivation {
name = "system";
buildCommand = systemBuilder;
inherit children;
inherit (pkgs) grub;
grubDevice = config.boot.grubDevice;
kernelParams =
config.boot.kernelParams ++ config.boot.extraKernelParams;
grubMenuBuilder = config.system.build.grubMenuBuilder;
configurationName = config.boot.configurationName;
# Most of these are needed by grub-install.
path = [
pkgs.coreutils
pkgs.gnused
pkgs.gnugrep
pkgs.findutils
pkgs.diffutils
pkgs.upstart # for initctl
];
};
in {
require = [options];
system.build.system = system;
}