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{ config, pkgs, lib, ... }:
with lib;
{
config = mkIf config.boot.isContainer {
# Disable some features that are not useful in a container.
boot.kernel.enable = false;
console.enable = mkDefault false;
nix.optimise.automatic = mkDefault false; # the store is host managed
powerManagement.enable = mkDefault false;
documentation.nixos.enable = mkDefault false;
networking.useHostResolvConf = mkDefault true;
# Containers should be light-weight, so start sshd on demand.
services.openssh.startWhenNeeded = mkDefault true;
# containers do not need to setup devices
services.udev.enable = false;
# Shut up warnings about not having a boot loader.
system.build.installBootLoader = lib.mkDefault "${pkgs.coreutils}/bin/true";
# Not supported in systemd-nspawn containers.
security.audit.enable = false;
# Use the host's nix-daemon.
environment.variables.NIX_REMOTE = "daemon";
};
}
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