Merge pull request #237154 from ElvishJerricco/sd-s1-networkd-flush-with-keep-configuration

    })

  ];

  stage1Options = {

    options.boot.initrd.systemd.network.networks = mkOption {

      type = with types; attrsOf (submodule {

        # Default in initrd is dhcp-on-stop, which is correct if flushBeforeStage2 = false

        config = mkIf config.boot.initrd.network.flushBeforeStage2 {

          networkConfig.KeepConfiguration = mkDefault false;

        };

      });

    };

  };

  stage1Config = let

    cfg = config.boot.initrd.systemd.network;

  in mkMerge [

      ];

      kernelModules = [ "af_packet" ];

      systemd.services.nixos-flush-networkd = mkIf config.boot.initrd.network.flushBeforeStage2 {

        description = "Flush Network Configuration";

        wantedBy = ["initrd.target"];

        after = ["systemd-networkd.service" "dbus.socket" "dbus.service"];

        before = ["shutdown.target" "initrd-switch-root.target"];

        conflicts = ["shutdown.target" "initrd-switch-root.target"];

        unitConfig.DefaultDependencies = false;

        serviceConfig = {

          # This service does nothing when starting, but brings down

          # interfaces when switching root. This is the easiest way to

          # ensure proper ordering while stopping. See systemd.unit(5)

          # section on Before= and After=. The important part is that

          # we are stopped before units we need, like dbus.service,

          # and that we are stopped before starting units like

          # initrd-switch-root.target

          Type = "oneshot";

          RemainAfterExit = true;

          ExecStart = "/bin/true";

        };

        # systemd-networkd doesn't bring down interfaces on its own

        # when it exits (see: systemd-networkd(8)), so we have to do

        # it ourselves. The networkctl command doesn't have a way to

        # bring all interfaces down, so we have to iterate over the

        # list and filter out unmanaged interfaces to bring them down

        # individually.

        preStop = ''

          networkctl list --full --no-legend | while read _idx link _type _operational setup _; do

            [ "$setup" = unmanaged ] && continue

            networkctl down "$link"

          done

        '';

      };

    })

  ];

in

{

  imports = [ stage1Options ];

  options = {

    systemd.network = commonOptions true;

    boot.initrd.systemd.network = commonOptions "shallow";