nixpkgs/nixos/modules/profiles/container.nix

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{ config, lib, pkgs, ... }:
with lib;
let
pkgs2storeContents = l : map (x: { object = x; symlink = "none"; }) l;
in {
# Docker image config.
imports = [
../installer/cd-dvd/channel.nix
./minimal.nix
./clone-config.nix
];
# Create the tarball
system.build.tarball = import ../../lib/make-system-tarball.nix {
inherit (pkgs) stdenv perl xz pathsFromGraph;
contents = [];
extraArgs = "--owner=0";
# Add init script to image
storeContents = [
{ object = config.system.build.toplevel + "/init";
symlink = "/init";
}
] ++ (pkgs2storeContents [ pkgs.stdenv ]);
# Some container managers like lxc need these
extraCommands = "mkdir -p proc sys dev";
};
boot.isContainer = true;
boot.postBootCommands =
''
# After booting, register the contents of the Nix store in the Nix
# database.
if [ -f /nix-path-registration ]; then
${config.nix.package}/bin/nix-store --load-db < /nix-path-registration &&
rm /nix-path-registration
fi
# nixos-rebuild also requires a "system" profile and an
# /etc/NIXOS tag.
touch /etc/NIXOS
${config.nix.package}/bin/nix-env -p /nix/var/nix/profiles/system --set /run/current-system
'';
# Disable some features that are not useful in a container.
sound.enable = mkDefault false;
services.udisks2.enable = mkDefault false;
# Install new init script
system.activationScripts.installInitScript = ''
ln -fs $systemConfig/init /init
'';
}